J/A+A/649/A98 Lightcurve inversion for 491 asteroids (Martikainen+, 2021)
Asteroid absolute magnitudes and phase curve parameters from Gaia photometry.
Martikainen J., Muinonen K., Penttila A., Cellino A., Wang X.-B.
<Astron. Astrophys. 649, A98 (2021)>
=2021A&A...649A..98M 2021A&A...649A..98M (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Photometry ; Models
Keywords: minor planets, asteroids: general - methods: numerical -
techniques: photometric
Abstract:
We perform lightcurve inversion for 491 asteroids to retrieve phase
curve parameters, rotation periods, pole longitudes and latitudes, and
convex and triaxial ellipsoid shapes by using the sparse photometric
observations from Gaia Data Release 2 and the dense ground-based
observations from the DAMIT data base. We develop a method for the
derivation of reference absolute magnitudes and phase curves from the
Gaia data, allowing for comparative studies among hundreds of
asteroids.
Description:
We present the results of lightcurve inversion for 491 asteroids using
triaxial ellipsoids and convex shapes. Furthermore, we have retrieved
reference phase curves and absolute magnitudes in Gaia G-band.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 41 491 Observational information
table2.dat 55 491 Derived phase curve slope parameters
table3.dat 51 491 Derived absolute magnitudes, G1 and G2 parameters
table4.dat 64 491 Rotation periods, longitudes, and latitudes
table5.dat 27 12 G1 and G2 parameter distributions for
different Tholen classes
--------------------------------------------------------------------------------
See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- Asteroid Asteroid number
10- 13 A4 --- Tholen Tholen taxonomic class
17- 19 A3 --- B-DM Bus-DeMeo taxonomic class
22- 25 I4 --- Nobs Number of Gaia and ground-based observations
27- 28 I2 --- K Number of observed ground-based lightcurves
30- 31 I2 --- NGaia Number of observed Gaia points
33- 41 A9 --- PhaseAngles Phase angle coverage
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- Asteroid Asteroid number
10- 13 A4 --- Tholen Tholen taxonomic class
17- 20 F4.2 --- betamax ?=- Brightness-maxima based phase curve slope
22- 25 F4.2 --- e_betamax ?=- 1-sigma uncertainty of betamax
27- 30 F4.2 --- betaref ?=- Mean-magnitude reference phase curve slope
32- 35 F4.2 --- e_betaref ?=- 1-sigma uncertainty of betaref
37- 40 F4.2 --- betaSCXI Phase curve slope using convex inversion
42- 45 F4.2 --- e_betaSCXI 1-sigma uncertainty of betaSCXI
47- 50 F4.2 --- betaSEI Phase curve slope using ellipsoid inversion
52- 55 F4.2 --- e_betaSEI 1-sigma uncertainty of betaSEI
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- Asteroid Asteroid number
10- 13 A4 --- Tholen Tholen taxonomic class
16- 20 F5.2 mag G(1-0) ?=- Derived G-band absolute magnitude
23- 26 F4.2 mag e_G(1-0) ?=- 1-sigma uncertainty of G(1-0)
28- 31 F4.1 mag H(JPL) Absolute magnitude retrieved from the JPL
35- 39 F5.2 mag H-G ?=- Derived absolute magnitude using
the H,G1,G2 fit
42- 45 F4.2 --- G1 ?=- G1 parameter
47- 51 F5.2 --- G2 ?=- G2 parameter
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- Asteroid Asteroid number
10- 13 A4 --- Tholen Tholen taxonomic class
16- 24 F9.5 --- Period Rotation period
26- 35 E10.4 --- e_Period 1-sigma uncertainty of the rotation period
37- 42 F6.2 --- longitude Longitude
45- 50 F6.2 --- e_longitude 1-sigma uncertainty of the longitude
53- 58 F6.2 --- latitude Latitude
60- 64 F5.2 --- e_latitude 1-sigma uncertainty of the latitude
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Tholen Tholen taxonomic class
4- 8 F5.3 --- G1 G1 parameter for each Tholen class
10- 14 F5.3 --- e_G1 ?=- 1-sigma uncertainty of G1 within a class
16- 21 F6.3 --- G2 G2 parameter for each Tholen class
23- 27 F5.3 --- e_G2 ?=- 1-sigma uncertainty of G2 within a class
--------------------------------------------------------------------------------
Acknowledgements:
Julia Martikainen, julia.martikainen(at)helsinki.fi
(End) Julia Martikainen [NOT, Spain], Patricia Vannier [CDS] 18-Mar-2021