J/A+A/665/A26 Asteroid taxonomy (Mahlke+, 2022)
Asteroid taxonomy from cluster analysis of spectrometry and albedo.
Mahlke M., Carry B., Mattei P.A.
<Astron. Astrophys. 665, A26 (2022)>
=2022A&A...665A..26M 2022A&A...665A..26M (SIMBAD/NED BibCode)
ADC_Keywords: Solar system ; Minor planets ; Morphology
Keywords: minor planets, asteroids: general - methods: data analysis -
techniques: spectroscopic
Abstract:
The classification of the minor bodies of the Solar System based on
observables has been continuously developed and iterated over the past
40 yr. While prior iterations followed either the availability of
large observational campaigns or new instrumental capabilities opening
new observational dimensions, we see the opportunity to improve
primarily upon the established methodology.
We developed an iteration of the asteroid taxonomy which allows the
classification of partial and complete observations (i.e. visible,
near-infrared, and visible-near-infrared spectrometry) and which
reintroduces the visual albedo into the classification observables.
The resulting class assignments are given probabilistically, enabling
the uncertainty of a classification to be quantified.
We built the taxonomy based on 2983 observations of 2125 individual
asteroids, representing an almost tenfold increase of sample size
compared with the previous taxonomy. The asteroid classes are
identified in a lower-dimensional representation of the observations
using a mixture of common factor analysers model.
We identify 17 classes split into the three complexes C, M, and S,
including the new Z-class for extremely-red objects in the main belt.
The visual albedo information resolves the spectral degeneracy of the
X-complex and establishes the P-class as part of the C-complex. We
present a classification tool which computes probabilistic class
assignments within this taxonomic scheme from asteroid observations,
intrinsically accounting for degeneracies between classes based on the
observed wavelength region. The taxonomic classifications of 6038
observations of 4526 individual asteroids are published.
The ability to classify partial observations and the reintroduction of
the visual albedo into the classification provide a taxonomy which is
well suited for the current and future datasets of asteroid
observations, in particular provided by the Gaia, MITHNEOS, NEO
Surveyor, and SPHEREx surveys.
Description:
We present a new iteration of the asteroid taxonomy from a clustering
analysis of spectroscopic observations and visual albedos of asteroids
in the Main Belt and near-Earth space. The classes are defined using a
concurrent dimensionality-reduction and Gaussian-clustering approach.
By re-introducing the visual albedo into the observables used to
classify asteroids, we disentangle the X-complex into the E, M, and
P classes. We further identify a new class Z of extremely-red objects
in the Main Belt.
Provided are the preprocessed spectra and visual albedos for the
samples in the visible-near-infrared dataset and the visible-only
dataset. For each sample, we further give the probability to belong to
any of the 50 Gaussian clusters and 16 classes (Class Ch does not have
a probability) and the latent scores. The depth, centers, and
signal-to-noise ratios of the e, h, and k features and the final
classifications per sample and asteroid are provided as well. This
data is aggregated into a single classification per asteroid in a
separate file. Further provided are the mean visible-near-infrared
spectrum and visual albedo per taxonomic class as defined in Mahlke+
2022. The moments were defined based on all asteroid samples which
were assigned to the respective class. The first column (feature)
gives the wavelength bins of the spectra as well as the visual albedo
(pV) in the last row. The mean values of the 17 classes follow in the
next column. The spectra are normalized to unity at 0.55micron.
Further provided are the upper and lower standard deviation for the
spectra and albedos per class, given in the respective 'E_' and
'e_' columns preceding the mean columns. Finally, there are two
tables containing the keys for the bibliographic references of the
spectra and visual albedos.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
asteroid.dat 167 4526 The aggregated classification per asteroid
template.dat 381 54 The class templates
classvni.dat 1599 2983 Classifications of visible-near-infrared samples
classvis.dat 1683 2923 Classifications of visible samples.
refalbed.dat 23 102 Key for albedo reference
refspect.dat 58 111 Key for spectra reference
--------------------------------------------------------------------------------
See also:
B/astorb : Orbits of Minor Planets (Bowell+ 2014)
Byte-by-byte Description of file: asteroid.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name Asteroid name or designation
19- 24 I6 --- Number ? Asteroid Number
26 I1 --- N Number of aggregated classifications
28- 30 A3 --- class Class of asteroid
32- 33 A2 --- classsf Class of asteroid without feature flag
35- 41 E7.2 --- classA Probability of belonging to class A
43- 49 E7.2 --- classB Probability of belonging to class B
51- 57 E7.2 --- classC Probability of belonging to class C
59- 65 E7.2 --- classD Probability of belonging to class D
67- 73 E7.2 --- classE Probability of belonging to class E
75- 81 E7.2 --- classK Probability of belonging to class K
83- 89 E7.2 --- classL Probability of belonging to class L
91- 97 E7.2 --- classM Probability of belonging to class M
99-105 E7.2 --- classO Probability of belonging to class O
107-113 E7.2 --- classP Probability of belonging to class P
115-121 E7.2 --- classQ Probability of belonging to class Q
123-129 E7.2 --- classR Probability of belonging to class R
131-137 E7.2 --- classS Probability of belonging to class S
139-145 E7.2 --- classV Probability of belonging to class V
147-153 E7.2 --- classX Probability of belonging to class X
155-161 E7.2 --- classZ Probability of belonging to class Z
163 I1 --- e [0/1]? Presence of feature e (1)
165 I1 --- h [0/1]? Presence of feature h (1)
167 I1 --- k [0/1]? Presence of feature k (1)
--------------------------------------------------------------------------------
Note (1): Value is empty if the band is not in the observed range in any
spectrum, 0 if the feature has not been observed in any spectrum,
1 if the feature is present in at least one spectrum of the asteroid.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: template.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Feature Wavelength bin of spectrum or pV
7- 12 F6.4 --- A Mean spectrum and albedo of class A
14- 19 F6.4 --- B Mean spectrum and albedo of class B
21- 26 F6.4 --- C Mean spectrum and albedo of class C
28- 33 F6.4 --- Ch Mean spectrum and albedo of class Ch
35- 40 F6.4 --- D Mean spectrum and albedo of class D
42- 47 F6.4 --- E Mean spectrum and albedo of class E
49- 54 F6.4 --- K Mean spectrum and albedo of class K
56- 61 F6.4 --- L Mean spectrum and albedo of class L
63- 68 F6.4 --- M Mean spectrum and albedo of class M
70- 75 F6.4 --- O Mean spectrum and albedo of class O
77- 82 F6.4 --- P Mean spectrum and albedo of class P
84- 89 F6.4 --- Q Mean spectrum and albedo of class Q
91- 96 F6.4 --- R Mean spectrum and albedo of class R
98-103 F6.4 --- S Mean spectrum and albedo of class S
105-110 F6.4 --- V Mean spectrum and albedo of class V
112-118 F7.4 --- X ? Mean spectrum and albedo of class X
120-125 F6.4 --- Z Mean spectrum and albedo of class Z
127-132 F6.4 --- E_A Upper std of spectrum and albedo of class A
134-139 F6.4 --- E_B Upper std of spectrum and albedo of class B
141-146 F6.4 --- E_C Upper std of spectrum and albedo of class C
148-153 F6.4 --- E_Ch Upper std of spectrum and albedo of class Ch
155-160 F6.4 --- E_D Upper std of spectrum and albedo of class D
162-167 F6.4 --- E_E Upper std of spectrum and albedo of class E
169-174 F6.4 --- E_K Upper std of spectrum and albedo of class K
176-181 F6.4 --- E_L Upper std of spectrum and albedo of class L
183-188 F6.4 --- E_M Upper std of spectrum and albedo of class M
190-195 F6.4 --- E_O Upper std of spectrum and albedo of class O
197-202 F6.4 --- E_P Upper std of spectrum and albedo of class P
204-209 F6.4 --- E_Q Upper std of spectrum and albedo of class Q
211-216 F6.4 --- E_R Upper std of spectrum and albedo of class R
218-223 F6.4 --- E_S Upper std of spectrum and albedo of class S
225-230 F6.4 --- E_V Upper std of spectrum and albedo of class V
232-238 F7.4 --- E_X ? Upper std of spectrum and albedo of class X
240-245 F6.4 --- E_Z Upper std of spectrum and albedo of class Z
247-253 F7.4 --- e_A [] Lower std of spectrum and albedo of class A
255-261 F7.4 --- e_B [] Lower std of spectrum and albedo of class B
263-269 F7.4 --- e_C [] Lower std of spectrum and albedo of class C
271-277 F7.4 --- e_Ch [] Lower std of spectrum and albedo of class Ch
279-285 F7.4 --- e_D [] Lower std of spectrum and albedo of class D
287-293 F7.4 --- e_E [] Lower std of spectrum and albedo of class E
295-301 F7.4 --- e_K [] Lower std of spectrum and albedo of class K
303-309 F7.4 --- e_L [] Lower std of spectrum and albedo of class L
311-317 F7.4 --- e_M [] Lower std of spectrum and albedo of class M
319-325 F7.4 --- e_O [] Lower std of spectrum and albedo of class O
327-333 F7.4 --- e_P [] Lower std of spectrum and albedo of class P
335-341 F7.4 --- e_Q [] Lower std of spectrum and albedo of class Q
343-349 F7.4 --- e_R [] Lower std of spectrum and albedo of class R
351-357 F7.4 --- e_S [] Lower std of spectrum and albedo of class S
359-365 F7.4 --- e_V [] Lower std of spectrum and albedo of class V
367-373 F7.4 --- e_X []? Lower std of spectrum and albedo of class X
375-381 F7.4 --- e_Z [] Lower std of spectrum and albedo of class Z
--------------------------------------------------------------------------------
Byte-by-byte Description of file: classvni.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- Number ? Asteroid number
8- 24 A17 --- Name Asteroid name or designation
26- 38 F13.10 --- PR0.45 ? Preprocessed reflectance at 0.45 micron
40- 53 F14.11 --- PR0.475 ? Preprocessed reflectance at 0.475 micron
55- 67 E13.6 --- PR0.5 ? Preprocessed reflectance at 0.5 micron
69- 82 F14.11 --- PR0.525 ? Preprocessed reflectance at 0.525 micron
84- 96 E13.7 --- PR0.55 ? Preprocessed reflectance at 0.55 micron
98- 111 F14.11 --- PR0.575 ? Preprocessed reflectance at 0.575 micron
113- 127 E15.8 --- PR0.6 ? Preprocessed reflectance at 0.6 micron
129- 143 E15.8 --- PR0.625 ? Preprocessed reflectance at 0.625 micron
145- 159 E15.8 --- PR0.65 ? Preprocessed reflectance at 0.65 micron
161- 174 F14.11 --- PR0.675 ? Preprocessed reflectance at 0.675 micron
176- 189 E14.8 --- PR0.7 ? Preprocessed reflectance at 0.7 micron
191- 204 F14.11 --- PR0.725 ? Preprocessed reflectance at 0.725 micron
206- 219 F14.11 --- PR0.75 ? Preprocessed reflectance at 0.75 micron
221- 234 F14.11 --- PR0.775 ? Preprocessed reflectance at 0.775 micron
236- 250 E15.8 --- PR0.8 ? Preprocessed reflectance at 0.8 micron
252- 266 E15.8 --- PR0.825 ? Preprocessed reflectance at 0.825 micron
268- 281 E14.7 --- PR0.85 ? Preprocessed reflectance at 0.85 micron
283- 295 E13.7 --- PR0.875 ? Preprocessed reflectance at 0.875 micron
297- 310 E14.7 --- PR0.9 ? Preprocessed reflectance at 0.9 micron
312- 325 F14.11 --- PR0.925 ? Preprocessed reflectance at 0.925 micron
327- 340 E14.7 --- PR0.95 ? Preprocessed reflectance at 0.95 micron
342- 356 E15.8 --- PR0.975 ? Preprocessed reflectance at 0.975 micron
358- 372 E15.8 --- PR1.0 ? Preprocessed reflectance at 1.0 micron
374- 387 E14.8 --- PR1.025 ? Preprocessed reflectance at 1.025 micron
389- 402 E14.8 --- PR1.05 ? Preprocessed reflectance at 1.05 micron
404- 417 F14.11 --- PR1.1 ? Preprocessed reflectance at 1.1 micron
419- 432 E14.8 --- PR1.15 ? Preprocessed reflectance at 1.15 micron
434- 447 E14.8 --- PR1.2 ? Preprocessed reflectance at 1.2 micron
449- 463 E15.8 --- PR1.25 ? Preprocessed reflectance at 1.25 micron
465- 478 E14.8 --- PR1.3 ? Preprocessed reflectance at 1.3 micron
480- 493 E14.8 --- PR1.35 ? Preprocessed reflectance at 1.35 micron
495- 509 E15.8 --- PR1.4 ? Preprocessed reflectance at 1.4 micron
511- 524 F14.11 --- PR1.45 ? Preprocessed reflectance at 1.45 micron
526- 538 F13.10 --- PR1.5 ? Preprocessed reflectance at 1.5 micron
540- 551 F12.9 --- PR1.55 ? Preprocessed reflectance at 1.55 micron
553- 565 F13.10 --- PR1.6 ? Preprocessed reflectance at 1.6 micron
567- 578 F12.9 --- PR1.65 ? Preprocessed reflectance at 1.65 micron
580- 591 F12.9 --- PR1.7 ? Preprocessed reflectance at 1.7 micron
593- 606 F14.11 --- PR1.75 ? Preprocessed reflectance at 1.75 micron
608- 621 F14.11 --- PR1.8 ? Preprocessed reflectance at 1.8 micron
623- 635 E13.7 --- PR1.85 ? Preprocessed reflectance at 1.85 micron
637- 649 F13.10 --- PR1.9 ? Preprocessed reflectance at 1.9 micron
651- 664 E14.7 --- PR1.95 ? Preprocessed reflectance at 1.95 micron
666- 679 F14.11 --- PR2.0 ? Preprocessed reflectance at 2.0 micron
681- 694 F14.11 --- PR2.05 ? Preprocessed reflectance at 2.05 micron
696- 709 F14.11 --- PR2.1 ? Preprocessed reflectance at 2.1 micron
711- 724 F14.11 --- PR2.15 ? Preprocessed reflectance at 2.15 micron
726- 737 F12.9 --- PR2.2 ? Preprocessed reflectance at 2.2 micron
739- 750 F12.9 --- PR2.25 ? Preprocessed reflectance at 2.25 micron
752- 765 F14.11 --- PR2.3 ? Preprocessed reflectance at 2.3 micron
767- 778 F12.9 --- PR2.35 ? Preprocessed reflectance at 2.35 micron
780- 792 F13.10 --- PR2.4 ? Preprocessed reflectance at 2.4 micron
794- 806 F13.10 --- PR2.45 ? Preprocessed reflectance at 2.45 micron
808- 819 F12.9 --- pV ? Preprocessed visual albedo
821- 839 F19.16 --- z0 Latent score in first latent factor
841- 859 F19.16 --- z1 Latent score in second latent factor
861- 882 E22.16 --- z2 Latent score in third latent factor
884- 906 E23.17 --- z3 Latent score in fourth latent factor
908- 914 E7.2 --- cluster0 Probability of belonging to cluster 0
916- 922 E7.2 --- cluster1 Probability of belonging to cluster 1
924- 930 E7.2 --- cluster2 Probability of belonging to cluster 2
932- 938 E7.2 --- cluster3 Probability of belonging to cluster 3
940- 946 E7.2 --- cluster4 Probability of belonging to cluster 4
948- 954 E7.2 --- cluster5 Probability of belonging to cluster 5
956- 962 E7.2 --- cluster6 Probability of belonging to cluster 6
964- 970 E7.2 --- cluster7 Probability of belonging to cluster 7
972- 978 E7.2 --- cluster8 Probability of belonging to cluster 8
980- 986 E7.2 --- cluster9 Probability of belonging to cluster 9
988- 994 E7.2 --- cluster10 Probability of belonging to cluster 10
996-1002 E7.2 --- cluster11 Probability of belonging to cluster 11
1004-1010 E7.2 --- cluster12 Probability of belonging to cluster 12
1012-1018 E7.2 --- cluster13 Probability of belonging to cluster 13
1020-1026 E7.2 --- cluster14 Probability of belonging to cluster 14
1028-1034 E7.2 --- cluster15 Probability of belonging to cluster 15
1036-1042 E7.2 --- cluster16 Probability of belonging to cluster 16
1044-1050 E7.2 --- cluster17 Probability of belonging to cluster 17
1052-1058 E7.2 --- cluster18 Probability of belonging to cluster 18
1060-1066 E7.2 --- cluster19 Probability of belonging to cluster 19
1068-1074 E7.2 --- cluster20 Probability of belonging to cluster 20
1076-1082 E7.2 --- cluster21 Probability of belonging to cluster 21
1084-1090 E7.2 --- cluster22 Probability of belonging to cluster 22
1092-1098 E7.2 --- cluster23 Probability of belonging to cluster 23
1100-1106 E7.2 --- cluster24 Probability of belonging to cluster 24
1108-1114 E7.2 --- cluster25 Probability of belonging to cluster 25
1116-1122 E7.2 --- cluster26 Probability of belonging to cluster 26
1124-1130 E7.2 --- cluster27 Probability of belonging to cluster 27
1132-1138 E7.2 --- cluster28 Probability of belonging to cluster 28
1140-1146 E7.2 --- cluster29 Probability of belonging to cluster 29
1148-1154 E7.2 --- cluster30 Probability of belonging to cluster 30
1156-1162 E7.2 --- cluster31 Probability of belonging to cluster 31
1164-1170 E7.2 --- cluster32 Probability of belonging to cluster 32
1172-1178 E7.2 --- cluster33 Probability of belonging to cluster 33
1180-1186 E7.2 --- cluster34 Probability of belonging to cluster 34
1188-1194 E7.2 --- cluster35 Probability of belonging to cluster 35
1196-1202 E7.2 --- cluster36 Probability of belonging to cluster 36
1204-1210 E7.2 --- cluster37 Probability of belonging to cluster 37
1212-1218 E7.2 --- cluster38 Probability of belonging to cluster 38
1220-1226 E7.2 --- cluster39 Probability of belonging to cluster 39
1228-1234 E7.2 --- cluster40 Probability of belonging to cluster 40
1236-1242 E7.2 --- cluster41 Probability of belonging to cluster 41
1244-1250 E7.2 --- cluster42 Probability of belonging to cluster 42
1252-1258 E7.2 --- cluster43 Probability of belonging to cluster 43
1260-1266 E7.2 --- cluster44 Probability of belonging to cluster 44
1268-1274 E7.2 --- cluster45 Probability of belonging to cluster 45
1276-1282 E7.2 --- cluster46 Probability of belonging to cluster 46
1284-1290 E7.2 --- cluster47 Probability of belonging to cluster 47
1292-1298 E7.2 --- cluster48 Probability of belonging to cluster 48
1300-1306 E7.2 --- cluster49 Probability of belonging to cluster 49
1308-1309 I2 --- cluster Most probable cluster of sample
1311-1317 E7.2 --- classA Probability of belonging to class A
1319-1325 E7.2 --- classB Probability of belonging to class B
1327-1333 E7.2 --- classC Probability of belonging to class C
1335-1341 E7.2 --- classD Probability of belonging to class D
1343-1349 E7.2 --- classE Probability of belonging to class E
1351-1357 E7.2 --- classK Probability of belonging to class K
1359-1365 E7.2 --- classL Probability of belonging to class L
1367-1373 E7.2 --- classM Probability of belonging to class M
1375-1381 E7.2 --- classO Probability of belonging to class O
1383-1389 E7.2 --- classP Probability of belonging to class P
1391-1397 E7.2 --- classQ Probability of belonging to class Q
1399-1405 E7.2 --- classR Probability of belonging to class R
1407-1413 E7.2 --- classS Probability of belonging to class S
1415-1421 E7.2 --- classV Probability of belonging to class V
1423-1429 E7.2 --- classX Probability of belonging to class X
1431-1437 E7.2 --- classZ Probability of belonging to class Z
1439-1441 A3 --- class Class of sample
1443-1444 A2 --- classsf Class of sample without feature flag
1446-1449 F4.1 --- e ? Presenece of feature e (1)
1451-1457 F7.4 um ecenter ? Central wavelength of feature e
1459-1466 F8.4 --- esnr ? Signal-to-noise ratio of feature e
1468-1474 F7.4 --- edepth ? Depth in percent of feature e
1476-1479 F4.1 --- k ? Presenece of feature k (1)
1481-1487 F7.4 um kcenter ? Central wavelength of feature k
1489-1496 F8.4 --- ksnr ? Signal-to-noise ratio of feature k
1498-1504 F7.4 --- kdepth ? Depth in percent of feature k
1506-1509 F4.1 --- h ? Presenece of feature h (1)
1511-1517 F7.4 um hcenter ? Central wavelength of feature h
1519-1526 F8.4 --- hsnr ? Signal-to-noise ratio of feature h
1528-1534 F7.4 --- hdepth ? Depth in percent of feature h
1536-1540 A5 --- Diffuse Sample belongs to diffuse cluster
1542-1565 A24 --- r_spectrum Key to reference of spectrum,
in refspect.dat file
1567-1599 A33 --- r_albedo Key to reference of albedo, in refalbed.dat
--------------------------------------------------------------------------------
Note (1): Value is empty if the band is not in the observed range, 0 if the
feature is not present, 1 if the feature is present in the sample.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: classvis.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- Number ? Asteroid number
8- 23 A16 --- Name Asteroid name or designation
25- 43 F19.16 --- PR0.45 ? Preprocessed reflectance at 0.45 micron
45- 63 F19.16 --- PR0.475 ? Preprocessed reflectance at 0.475 micron
65- 83 F19.16 --- PR0.5 ? Preprocessed reflectance at 0.5 micron
85- 107 E23.16 --- PR0.525 ? Preprocessed reflectance at 0.525 micron
109- 131 E23.17 --- PR0.55 ? Preprocessed reflectance at 0.55 micron
133- 155 E23.16 --- PR0.575 ? Preprocessed reflectance at 0.575 micron
157- 177 E21.15 --- PR0.6 ? Preprocessed reflectance at 0.6 micron
179- 201 E23.16 --- PR0.625 ? Preprocessed reflectance at 0.625 micron
203- 225 E23.17 --- PR0.65 ? Preprocessed reflectance at 0.65 micron
227- 249 E23.16 --- PR0.675 ? Preprocessed reflectance at 0.675 micron
251- 274 E24.17 --- PR0.7 ? Preprocessed reflectance at 0.7 micron
276- 298 E23.16 --- PR0.725 ? Preprocessed reflectance at 0.725 micron
300- 323 E24.17 --- PR0.75 ? Preprocessed reflectance at 0.75 micron
325- 347 E23.17 --- PR0.775 ? Preprocessed reflectance at 0.775 micron
349- 371 E23.16 --- PR0.8 ? Preprocessed reflectance at 0.8 micron
373- 395 E23.17 --- PR0.825 ? Preprocessed reflectance at 0.825 micron
397- 419 E23.16 --- PR0.85 ? Preprocessed reflectance at 0.85 micron
421- 444 E24.17 --- PR0.875 ? Preprocessed reflectance at 0.875 micron
446- 464 F19.16 --- PR0.9 ? Preprocessed reflectance at 0.9 micron
466- 488 E23.16 --- PR0.925 ? Preprocessed reflectance at 0.925 micron
490- 508 F19.16 --- PR0.95 ? Preprocessed reflectance at 0.95 micron
510- 528 F19.16 --- PR0.975 ? Preprocessed reflectance at 0.975 micron
530- 548 F19.16 --- PR1.0 ? Preprocessed reflectance at 1.0 micron
550- 568 F19.16 --- PR1.025 ? Preprocessed reflectance at 1.025 micron
570- 588 F19.16 --- PR1.05 ? Preprocessed reflectance at 1.05 micron
590- 608 F19.16 --- PR1.1 ? Preprocessed reflectance at 1.1 micron
610- 628 F19.16 --- PR1.15 ? Preprocessed reflectance at 1.15 micron
630- 648 F19.16 --- PR1.2 ? Preprocessed reflectance at 1.2 micron
650- 668 F19.16 --- PR1.25 ? Preprocessed reflectance at 1.25 micron
670- 688 F19.16 --- PR1.3 ? Preprocessed reflectance at 1.3 micron
690- 708 F19.16 --- PR1.35 ? Preprocessed reflectance at 1.35 micron
710- 728 F19.16 --- PR1.4 ? Preprocessed reflectance at 1.4 micron
730- 748 F19.16 --- PR1.45 ? Preprocessed reflectance at 1.45 micron
750- 768 F19.16 --- PR1.5 ? Preprocessed reflectance at 1.5 micron
770- 788 F19.16 --- PR1.55 ? Preprocessed reflectance at 1.55 micron
790- 808 F19.16 --- PR1.6 ? Preprocessed reflectance at 1.6 micron
810- 828 F19.16 --- PR1.65 ? Preprocessed reflectance at 1.65 micron
830- 833 I4 --- PR1.7 ? Preprocessed reflectance at 1.7 micron
835- 838 I4 --- PR1.75 ? Preprocessed reflectance at 1.75 micron
840- 843 I4 --- PR1.8 ? Preprocessed reflectance at 1.8 micron
845- 848 I4 --- PR1.85 ? Preprocessed reflectance at 1.85 micron
850- 853 I4 --- PR1.9 ? Preprocessed reflectance at 1.9 micron
855- 858 I4 --- PR1.95 ? Preprocessed reflectance at 1.95 micron
860- 863 I4 --- PR2.0 ? Preprocessed reflectance at 2.0 micron
865- 868 I4 --- PR2.05 ? Preprocessed reflectance at 2.05 micron
870- 873 I4 --- PR2.1 ? Preprocessed reflectance at 2.1 micron
875- 878 I4 --- PR2.15 ? Preprocessed reflectance at 2.15 micron
880- 883 I4 --- PR2.2 ? Preprocessed reflectance at 2.2 micron
885- 888 I4 --- PR2.25 ? Preprocessed reflectance at 2.25 micron
890- 893 I4 --- PR2.3 ? Preprocessed reflectance at 2.3 micron
895- 898 I4 --- PR2.35 ? Preprocessed reflectance at 2.35 micron
900- 903 I4 --- PR2.4 ? Preprocessed reflectance at 2.4 micron
905- 908 I4 --- PR2.45 ? Preprocessed reflectance at 2.45 micron
910- 928 F19.16 --- pV ? Preprocessed visual albedo
930- 953 E24.17 --- z0 Latent score in first latent factor
955- 973 F19.16 --- z1 Latent score in second latent factor
975- 997 E23.16 --- z2 Latent score in third latent factor
999-1022 E24.17 --- z3 Latent score in fourth latent factor
1024-1030 E7.2 --- cluster0 Probability of belonging to cluster 0
1032-1038 E7.2 --- cluster1 Probability of belonging to cluster 1
1040-1046 E7.2 --- cluster2 Probability of belonging to cluster 2
1048-1054 E7.2 --- cluster3 Probability of belonging to cluster 3
1056-1062 E7.2 --- cluster4 Probability of belonging to cluster 4
1064-1070 E7.2 --- cluster5 Probability of belonging to cluster 5
1072-1078 E7.2 --- cluster6 Probability of belonging to cluster 6
1080-1086 E7.2 --- cluster7 Probability of belonging to cluster 7
1088-1094 E7.2 --- cluster8 Probability of belonging to cluster 8
1096-1100 E5.1 --- cluster9 Probability of belonging to cluster 9
1102-1108 E7.2 --- cluster10 Probability of belonging to cluster 10
1110-1116 E7.2 --- cluster11 Probability of belonging to cluster 11
1118-1124 E7.2 --- cluster12 Probability of belonging to cluster 12
1126-1132 E7.2 --- cluster13 Probability of belonging to cluster 13
1134-1140 E7.2 --- cluster14 Probability of belonging to cluster 14
1142-1148 E7.2 --- cluster15 Probability of belonging to cluster 15
1150-1156 E7.2 --- cluster16 Probability of belonging to cluster 16
1158-1164 E7.2 --- cluster17 Probability of belonging to cluster 17
1166-1172 E7.2 --- cluster18 Probability of belonging to cluster 18
1174-1180 E7.2 --- cluster19 Probability of belonging to cluster 19
1182-1188 E7.2 --- cluster20 Probability of belonging to cluster 20
1190-1196 E7.2 --- cluster21 Probability of belonging to cluster 21
1198-1204 E7.2 --- cluster22 Probability of belonging to cluster 22
1206-1212 E7.2 --- cluster23 Probability of belonging to cluster 23
1214-1220 E7.2 --- cluster24 Probability of belonging to cluster 24
1222-1228 E7.2 --- cluster25 Probability of belonging to cluster 25
1230-1236 E7.2 --- cluster26 Probability of belonging to cluster 26
1238-1244 E7.2 --- cluster27 Probability of belonging to cluster 27
1246-1252 E7.2 --- cluster28 Probability of belonging to cluster 28
1254-1260 E7.2 --- cluster29 Probability of belonging to cluster 29
1262-1268 E7.2 --- cluster30 Probability of belonging to cluster 30
1270-1276 E7.2 --- cluster31 Probability of belonging to cluster 31
1278-1284 E7.2 --- cluster32 Probability of belonging to cluster 32
1286-1292 E7.2 --- cluster33 Probability of belonging to cluster 33
1294-1300 E7.2 --- cluster34 Probability of belonging to cluster 34
1302-1308 E7.2 --- cluster35 Probability of belonging to cluster 35
1310-1316 E7.2 --- cluster36 Probability of belonging to cluster 36
1318-1324 E7.2 --- cluster37 Probability of belonging to cluster 37
1326-1332 E7.2 --- cluster38 Probability of belonging to cluster 38
1334-1340 E7.2 --- cluster39 Probability of belonging to cluster 39
1342-1348 E7.2 --- cluster40 Probability of belonging to cluster 40
1350-1356 E7.2 --- cluster41 Probability of belonging to cluster 41
1358-1364 E7.2 --- cluster42 Probability of belonging to cluster 42
1366-1372 E7.2 --- cluster43 Probability of belonging to cluster 43
1374-1380 E7.2 --- cluster44 Probability of belonging to cluster 44
1382-1388 E7.2 --- cluster45 Probability of belonging to cluster 45
1390-1396 E7.2 --- cluster46 Probability of belonging to cluster 46
1398-1404 E7.2 --- cluster47 Probability of belonging to cluster 47
1406-1412 E7.2 --- cluster48 Probability of belonging to cluster 48
1414-1420 E7.2 --- cluster49 Probability of belonging to cluster 49
1422-1423 I2 --- cluster Most probable cluster of sample
1425-1431 E7.2 --- classA Probability of belonging to class A
1433-1439 E7.2 --- classB Probability of belonging to class B
1441-1447 E7.2 --- classC Probability of belonging to class C
1449-1455 E7.2 --- classD Probability of belonging to class D
1457-1463 E7.2 --- classE Probability of belonging to class E
1465-1471 E7.2 --- classK Probability of belonging to class K
1473-1479 E7.2 --- classL Probability of belonging to class L
1481-1487 E7.2 --- classM Probability of belonging to class M
1489-1495 E7.2 --- classO Probability of belonging to class O
1497-1503 E7.2 --- classP Probability of belonging to class P
1505-1511 E7.2 --- classQ Probability of belonging to class Q
1513-1519 E7.2 --- classR Probability of belonging to class R
1521-1527 E7.2 --- classS Probability of belonging to class S
1529-1535 E7.2 --- classV Probability of belonging to class V
1537-1543 E7.2 --- classX Probability of belonging to class X
1545-1551 E7.2 --- classZ Probability of belonging to class Z
1553-1554 A2 --- class Class of sample
1556-1557 A2 --- classsf Class of sample without feature flag
1559-1562 F4.1 --- e ? Presenece of feature e (1)
1564-1570 F7.4 um ecenter ? Central wavelength of feature e
1572-1579 F8.4 --- esnr ? Signal-to-noise ratio of feature e
1581-1587 F7.4 --- edepth ? Depth in percent of feature e
1589-1592 I4 --- k ? Presenece of feature k (1)
1594-1597 I4 um kcenter ? Central wavelength of feature k
1599-1602 I4 --- ksnr ? Signal-to-noise ratio of feature k
1604-1607 I4 --- kdepth ? Depth in percent of feature k
1609-1612 F4.1 --- h ? Presenece of feature h (1)
1614-1620 F7.4 um hcenter ? Central wavelength of feature h
1622-1629 F8.4 --- hsnr ? Signal-to-noise ratio of feature h
1631-1637 F7.4 --- hdepth ? Depth in percent of feature h
1639-1643 A5 --- Diffuse Sample belongs to diffuse cluster
1645-1649 F5.1 --- r_spectrum Key to reference of spectrum,
in refspect.dat file
1651-1683 A33 --- r_albedo Key to reference of albedo, in refalbed.dat
--------------------------------------------------------------------------------
Note (1): Value is empty if the band is not in the observed range, 0 if the
feature is not present, 1 if the feature is present in the sample.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: refalbed.dat refspect.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Ref Reference number
5- 23 A19 --- bibCode BibCode
25- 58 A34 --- Com Comments
--------------------------------------------------------------------------------
Acknowledgements:
Max Mahlke, max.mahlke(at)oca.eu
(End) Max Mahlke [OCA, France], Patricia Vannier [CDS] 01-Jun-2022