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VI/132A             Lunar Occultation Archive              (Herald+ 2012)

Lunar Occultation Archive Herald D., Gault D. <International Occultation Timing Association (IOTA) (2010-2012)>
ADC_Keywords: Occultations Description: Lunar occultation timings from 1623 to the present time are brought together in a consistent format. The observations have been processed and reviewed to correct a range of data errors. Provisional reductions of the observations are provided. The reductions are based on the JPL-DE422 and -DE423 ephemerides, with limb corrections derived from satellite altimetry from the Kaguya mission. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file lunarocc.dat 338 467974 Lunar occultation archive doc.txt 73 1064 Detailed information concerning the derivation of the data, the corrections applied, and the basis of the reductions
See also: http://occsec.wellington.net.nz/ : IOTA home page for Australasia http://www.iota-es.de/ : IOTA home page for Europe http://astro-limovie.info/jclo/index.html : IOTA home page for Japan http://www.lunar-occultations.com/IOTA : IOTA home page for North America VI/122 : The Marginal Zone of the Moon - Watts' Charts (Watts, 1963) Byte-by-byte Description of file: lunarocc.dat
Bytes Format Units Label Explanations
1- 4 I4 yr Obs.Y [1623,2020] Year of the observation 5- 6 I2 "month" Obs.M [1,12] Month of the observation 7- 8 I2 d Obs.D [1,31] Day of the observation 9- 10 I2 h Obs.h [0,23] Hour of the observation 11- 12 I2 min Obs.m [0,59] Minute of the observation 13- 18 F6.3 s Obs.s [0,59.999] Second of the observation. 19 A1 --- CatID [APRSXU] The star catalogue or object type (1) 20- 25 I6 --- CatNum [0,999999] Number in catalogue (2) 26 A1 --- WDS [A-Z, a-z] Double star component identifier (3) 27 A1 --- Phen [BDEFMORSX?] Phenomena type (4) 28 A1 --- Limb [DBU?] Bright or dark limb (5) 29 A1 --- Graze [G?] Flag for grazing occultation event (6) 30- 33 F4.2 --- PE [0.00,9.99]? Personal equation. 34 A1 --- PEApp [ABESUX?] Application of Personal equation (7) -------------------------------------------------------------------------------- 35 A1 --- Meth1 [CEGKMOPSTVX?] First method of timing and recording 1 (8) 36 A1 --- Meth2 [ACEGKMOPSTVX?] Second method of timing and recording (8) 37 A1 --- Time [CMNGORT?] Time source (9) 38- 42 F5.3 s Accur [0.000,9.999]? Accuracy of time. 43 A1 --- Cert [123?] Certainty (10) 44- 46 F3.1 --- SN [0.0-9.9]? Signal-to-Noise ratio (11) 47 A1 --- Double [BEFNSUW?] Double star or unidentified star (12) 48- 52 F5.3 s Durn [0.000,9.999]? Duration of non-instantaneous event (13) 53 A1 --- LLevel [TF?] Light level at event (14) 54 A1 --- Stabil [123?] Sky stability (1=good, 3=poor) (15) 55 A1 --- Transp [123?] Sky transparency (1=good, 3=poor) (15) 56 A1 --- Remark [123456789?] Remarkable circumstances (17) 57- 59 I3 degC Temp [-49,+50]? Temperature, degrees Celsius -------------------------------------------------------------------------------- 60 A1 --- Acc [123456789?] Accuracy (18) 61 A1 --- Cond [123456789?] Condition (19) 62 A1 --- Ad_Dbl [28?] Time adjusted; Double star (20) 63 A1 --- TMeth [0123456789?] Timing method (21) -------------------------------------------------------------------------------- 64- 69 A6 --- --- ?=? Reserved for future use 70 A1 --- EGraze [GX?] Graze - additions from original reports (22) 71 A1 --- Graze2 [2?] Graze observed at 2nd Limit (23) 72 A1 --- Srce [AHIMNOPRSX] Source of observation (24) 73 A1 --- DupErr [DIKX?] Duplicate/erroneous observation (25) 74 A1 --- Valid [ABCDEFGSTUWXYZ?] Observation validity (26) 75- 78 I4 yr GZyear [1706,2020]? Graze identifier - year (27) 79- 81 I3 --- GZnum [1,150]? Graze identifier - number in year (27) -------------------------------------------------------------------------------- 82 A1 --- Long.- [-+]? Site location: sign of longitude 83- 85 I3 deg Long.d [0,180]? Site location: degrees of longitude 86- 87 I2 arcmin Long.m ? Site location: minutes of longitude 88- 92 F5.2 arcsec Long.s ? Site location: seconds of longitude 93 A1 --- Lat.- [-+]? Site location: sign of latitude 94- 95 I2 deg Lat.d [0,89]? Site location: degrees of latitude 96- 97 I2 arcmin Lat.m ? Site location: minutes of latitude 98-102 F5.2 arcsec Lat.s ? Site location: seconds of latitude 103-104 I2 --- HDatum ? Horizontal datum code (28) 105-110 F6.1 m Alt [-999.9,+9999.9]? Altitude 111 A1 --- VDatum [ME] Vertical datum code (29) 112-120 A9 --- ILOCst ?=? ILOC Station + Telescope code 121-127 A7 --- RGOst ?=? RGO station + Observer code 128-177 A50 --- Town ?=? Closest town or landmark, and Country. -------------------------------------------------------------------------------- 178 A1 --- Tel [*CNOR?] Type of telescope (30) 179 A1 --- Mount [*AE?] Telescope mounting (31) 180 A1 --- Drive [*DM?] Telescope drive (32) 181-184 I4 cm Apert ? Telescope aperture 185-188 I4 cm FL ? Telescope focal length -------------------------------------------------------------------------------- 189-213 A25 --- Name ?=? Observer name -------------------------------------------------------------------------------- 214-217 I4 yr Src.Y [19,2094]? Year in source data 218-219 I2 "month" Src.M [0,91]? Month in source data 220-221 I2 d Src.D [0,31]? Day in source data 222-223 I2 h Src.h [-1,+98]? Hour in source data 224-225 I2 min Src.m [0,99]? Minute in source data 226-231 F6.3 s Src.s [0,99.95]? Second in source data -------------------------------------------------------------------------------- 232 A1 --- SrcCat [AHMOPRSXU?] Star catalogue or object type in source data (1) 233-238 I6 --- SrcNum ? Number in catalogue in source data (2) -------------------------------------------------------------------------------- 239 A1 --- SrcLg.- [-+] Sign of longitude in source data 240-242 I3 deg SrcLg.d [0,180]? degrees of longitude in source data 243-244 I2 arcmin SrcLg.m [0,72]? minutes of longitude in source data 245-249 F5.2 arcsec SrcLg.s [0,92.0]? seconds of longitude in source data 250 A1 --- SrcLt.- [-+] Sign of latitude in source data 251-252 I2 deg SrcLt.d [0,89]? degrees of latitude in source data 253-254 I2 arcmin SrcLt.m [0,59]? minutes of latitude in source data 255-259 F5.2 arcsec SrcLt.s [0,65.0]? seconds of latitude in source data 260-261 I2 --- SrcHDt ? Horizontal datum code in source data (28) 262-267 F6.1 m SrcAlt [-999.,+9999.9]? Altitude in source data 268 A1 --- SrcVDt [EM?] Vertical datum code in source data (29) -------------------------------------------------------------------------------- 269-277 F9.2 deg LibLon Longitude libration 278-283 F6.2 deg LibLat Latitude libration 284-290 F7.2 deg AA Axis Angle 291-296 F6.3 --- Scale Ratio of the apparent to mean lunar radius 297-302 F6.2 arcsec LimbH Height of the lunar limb 303-311 F9.2 arcsec OC O-C residual - height of the star above the lunar limb. 312-318 F7.2 deg PA [0,360] Position Angle on the lunar limb. 319-325 F7.2 arcsec/s dOC O-C change for a time difference of +1.0 second. 326-331 F6.2 arcsec/s dMoon Apparent rate of motion of moon 332-338 F7.2 deg PAmoon Position Angle of direction of motion of the moon
Note (1): the star catalogue code is designated as follows: R = Zodiacal Catalogue [ADS ref 1940USNAO..10..169R] S = SAO catalogue [I/131] X = XZ80Q catalogue [I/291] A = Numbered asteroid (see Cat. B/astorb) P = Planet and planet satellites U = Unidentified star The following codes are additionally referred to in the source data (columnn 232): H = a catalogue used internally by ILOC M = PPM catalogue [I/146, I/193] O = an unpublished catalog of faint stars used for lunar eclipses Note (2): the number for catalogues A, P and U are: A = the asteroid number [Unnumbered asteroids cannot be specified] P = the number is formed as pmmm, where: p is planet number and mmm is moon number. For an occultation of the planet, mmm=000 Examples: Mercury=1000, Jupiter=5000, Ganymede=5003, Titan=6006 U = always 0 Note (3): the WDS code is the component identifier the star in a double star system listed in the WDS [B/WDS] Note (4): the code for the Phenomena type is as follows: D = disappear R = reappear B = Blink. The mid-time of a blink event. Usually only occurs during a graze, but can occur in near-graze situations. Duration is specified at col 48. (video) partial disappearance (always >25% of full light). (visual) a short disappearance-reappearance - too close to separately time. F = Flash. The mid-time of a flash event. Usually only occurs during a graze, but can occur in near-graze situations. Duration is specified at col 48. (video) partial reappearance (always <25% of full light). (visual) a short reappearance-disappearance - too close to separately time. M = Miss. The time when the star was adjacent the highest point on the observed or predicted graze profile - although the time might also be simply the mid-time of the graze. Usually only used when other observers in a graze observation have recorded D and/or R events S = Start or resume. Only used in a graze observation, to indicate periods when the observer was observing. E = End or pause. Only used in a graze observation, to indicate periods when the observer was not observing. O = Other [used by ILOC instead of S or E] X = Missing data. A grazing occultation of this star was known to have been successfully observed on this date, but no observations are available. The time and site coordinates are indicative only. Note (5): the Bright or dark limb code is: D = dark limb B = bright limb (including lunar eclipse penumbra) U = umbra of lunar eclipse Note (6): The Graze flag is set to G if the event is part of a grazing occultation. An ordinary occultation occuring within 4.5° of the tangent point is treated as a graze observation. Note (7): the code for the Application of personal equation is: S = personal equation has been subtracted from the observed time. A = same as S, but PE listed is an assumed value [compatibility for ILOC observations] B = same as S, but the value of the PE applied is unknown [compatibility for RGO observations] U = personal equation has not been subtracted from the reported time. E = personal equation not relevant to the method of timing (eg video, eye-ear) X = Not known whether any PE has been applied. Note (8): the code for the method of timing and recording is: G = Video with time insertion, times extracted by frame analysis V = Video with other time linking, times extracted by frame analysis M = Video with other time linking, times extracted by replay S = Stopwatch (visual) T = Tape recorder (visual) E = Eye and ear P = Photoelectric K = Key-tapping - including computer keyboards X = Chronograph C = Camera and clock O = Other [details reported to ILOC, but not captured.] A = Time base corrected using adjacent observers. This is only used in Meth2. Note (9): the code for the Time source is: G = GPS (using 1PPS output, NOT GPS screen display) R = Radio signal (standard time signal) N = Network Time Protocol (using NTP software) C = Clock(adjusted by standard time signal) T = Telephone M = Some medium related with standard time signal O = GPS screen display, computer clock not using NTP software (poor accuracy). Note (10): the code for Certainty is the following: 1 = Sure 2 = Possibly spurious 3 = Most likely spurious Note (11): Signal to noise is only given for video or photoelectric observations. Note (12): the code for Double star or unidentified star is: W = Preceding (west) component E = Following (east) component N = North component S = South component B = Brighter component F = Fainter component U = Unidentified star Note (13): the duration of the event relates to both Fresnel diffraction effects, and the effects of stellar diameter. The duration of event does not apply to the time difference between the occultation of both components of a close double star. Note (14): the code for Light level at event is: T = 25% light level (consistent with Fresnel diffraction) F = 50% light level (consistent with stellar diameter effects) The code is only applied where the occultation was recorded by video or photometer. Note (15): the code for Sky stability/transparency is: 1 = Good 2 = Fair 3 = Poor Note (17): the code for Remarkable circumstances is the following: 1 = Gradual [not instantaneous] event 2 = Dark limb visible 3 = By averted vision 4 = Star faint 5 = Through thin cloud 6 = Many clouds 7 = Strong wind 8 = In strong twilight 9 = In daylight (sun altitude >-6° {civil twilight}) Note (18): the code for Accuracy (RGO) is: 1 = excellent, very good (±0.1s, ±0.2s) 2 = good, certain (±0.3s, ±0.4s) 3 = fair, satisfactory (±0.5s to ±0.7s) 4 = poor, uncertain (±0.8s, ±0.9s) 5 = very poor, very doubtful (±1s) 6 = star faint 7 = perhaps early 8 = perhaps late 9 = uncertain by tens of seconds Note (19): the code for Condition (RGO) is: 1 = clear, good conditions 2 = haze, mist, thin cloud 3 = cloud 4 = difficult conditions 5 = not instantaneous, gradual 6 = dark limb visible 7 = by averted vision 8 = during lunar eclipse 9 = obvious mistake corrected on report Note (20): the code for Time adjusted; double star (RGO) is: 2 = reported time adjusted by integral number of minutes, hours, etc, for obvious mistake 8 = component of double star (Observations of components of double or compound star systems which do not have positions in the ZC or SAOC are indicated by an '8') Note (21): the code for Timing method (RGO) is the following: 1 = photoelectric 2 = eye-and-ear 3 = chronograph 4 = stopwatch and time-signal 5 = stopwatch and telephone time-signal 6 = camera and clock 7 = eye-and-ear with sidereal chronometer 8 = chronograph and sidereal clock 9 = tape recorder and time signal 0 = not known Note (22): the code for Graze - additions from original reports is: G = details added/edited from original reports X = Missing data. A grazing occultation of this star is known to have been successfully observed on this date, but no observations are available. Note (23): on rare occasions a star is observed to graze at both the northern and southern limbs of the moon. Those grazes are distinguished by one of them being assigned the code 2. Note (24): the code for the Source of observation is the following: A = New observation reports H = RGO grazing occultations, OCR'd from RGO Bulletin 192 (1984) I = ILOC computer records - annual consolidations M = Miscellaneous sources (grazes before 1960, + missing grazes) N = S. Newcomb: Researches on the Motion of the Moon (APAE, 1878) O = grazes in the files of Occult P = re-processed ILOC reports after 2002 R = RGO computer records - ordinary occultations S = Graze reports collected by Mitsuru Soma - up to 2007. X = ILOC computer records after 2000, where no site code was allocated Note (25): the code for Duplicate/erroneous observation is the following: D = Observation is a duplicate, and is to be ignored in favour of another observation. Observation can be removed from the dataset. I = Observation is a graze observation that is inconsistent with other observations. Presumably an erroneous observation. However the observation is to be retained in the dataset K = Observation is a duplicate, and is to be ignored in favour of another observation. However observation is to be retained in the dataset X = Missing data. A grazing occultation of this star was known to have been successfully observed on this date, but no observations are available. Note (26): the code for Observation validity is the following: A = Valid, after adjustments to the date/time. B = Valid, after adjustments to the star number. C = Valid, after adjustments to both the date/time AND star number. D = Valid, after adjustments to site coordinates (*) E = Valid, after adjustments to site coordinates AND date/time (*) F = Valid, after adjustments to site coordinates AND star number (*) G = Valid, after adjustments to site coordinates AND star number AND date/time (*) S = Unknown site location [Used for RGO and ILOC data, where there is no site data for the specified station.] T = Poor time base [for events before 1850] U = Unidentified star W = Invalid site location. The site location is definitely in error (eg site located in the sea, or all observations from the location have large residuals), and the correct location cannot be deduced (eg obvious transposition of digits in the reported site coordinates). X = Assessed as an invalid observation. On investigation, confident the relevant occultation and observing location has been identified, with a conclusion that the event was not actually observed for some reason - such as difficult conditions. Y = limb-corrected residual greater than about 4". This is a flag automatically generated to indicate the computed residual is unsatisfactory. The exact criteria applied depends on the basis for correcting the limb for its irregularities. Events with this flag have not been individually investigated to determine whether there is an error in the reported data, or whether the observation was adversely affected by poor observing conditions (that is, is invalid). Z = Unresolved data errors. After considering the possibility of errors in several of date + time, star, and site location, the reported observation cannot be plausibly associated with a relevant occultation. (*) NOTE for codes D, E, F and G: Adjustments to site coordinates are made on the basis of ALL observations made from a site, and not on an event-by-event basis. Note (27): The graze identifier year and number in year provides a simple means to extract all observations of a particular grazing occultation. Use column 71 to distinguish events when the graze was observed at both limbs. Note (28): the code for Horizontal datum is the following: 0 = unknown (WGS84 used) 1 = RGO code 1 = 'geodetic, referred to one of the following major datum blocks; 1927 North American Datum, European Datum or Australian Geodetic Datum' 2 = RGO code 2 = 'geodetic, either referred to one of the secondary datum blocks, such as Tokyo Datum or African Arc Datum, or are referred to a national datum, such as the 1936 Ordnance Survey of Great Britain' 3 = RGO code 3 = 'probably geodetic' 4 = RGO code 4 = 'probably astronomic' 5 = RGO code 5 = 'astronomical' 10 = 'GoogleEarth' (WGS84) 12 = Christmas Island Astro 1967 13 = Chua Astro (Brazil Geodetic) 14 = Corrego Alegre (Brazil) 15 = Easter Island Astro 1967 16 = European 1950 17 = Graciosa Island (Azores) 18 = Gizo, Provisional DOS 19 = Guam 20 = Heard Astro 1969 21 = Iben Astro, Navy 1947 (Truk) 22 = Indian 23 = Isla Socorro Astro 24 = Johnston Island 1961 25 = Kusaie Astro 1962,1965 26 = Luzon 1911 (Philippines) 27 = Midway Astro 1961 28 = New Zealand 1949 29 = North American 1927 30 = Cape Canaveral 31 = White Sands 32 = Old Bavarian 33 = Old Hawaiian 34 = Ordnance Survey of Great Britain 1936 35 = Pico de las Nieves (Canaries) 36 = Pitcairn Island Astro 37 = Potsdam 38 = Provisional South American 1956 39 = Provisional South Chile 1963 40 = Pulkovo 1942 41 = South American 1969 42 = Southeast Island (Mahe) 43 = South Georgia Astro 44 = Swallow Islands (Solomons) 45 = Tananarive 46 = Tokyo 47 = Tristan Astro 1968 48 = Viti Levu 1916 (Fiji) 49 = Wake Island Astro 1952 50 = Yof Astro 1967 (Dakar) 51 = Palmer Astro 1969 (Antarctica) 52 = Efate (New Hebrides) 53 = Marcus Island 1965 54 = Canton Astro 1966 56 = Yap Island 58 = Kourou (French Guiana) 59 = Ordnance Survey of Great Britain 1970 60 = Qornoq (Greenland) 61 = Adindan (Ethiopia) 62 = American Samoa 1962 63 = Arc-Cape (South Africa) 64 = Argentine 65 = Ascension Island 1958 66 = Australian Geodetic 67 = Bermuda 1957 68 = Berne 1898 69 = Betio Island 1966 70 = Camp Area Astro 1961-62 USGS 71 = Batavia (Java) 72 = Palestine (Israel,Jordan) 73 = Hermannskogel (Austria,Czech.,Yugoslavia) 74 = Kandawala (Ceylon) 80 = ETRS89 (European Terrestial Reference System) 81 = Amersfoort 1885 (Netherlands) 82 = NAD83/NAD1983 (=WGS84) 84 = WGS84 85 = JGD2000 (=WGS84) 86 = GDA94 (=WGS84) 87 = NZGD2000 (=WGS84) 88 = NGRF2000 (=WGS84) 89 = KDG2000 (=WGS84) 90 = Hartebeesthoek94 (=WGS84) 91 = TWD94 (=WGS84) Note (29): the code for Vertical datum code is: M = Mean Sea Level E = Ellipsoid [for use when a GPS unit does not correct computed elevations for the difference between the Ellipsoid and Mean Sea Level.] Note (30): the code for Type of telescope is the following: R = Refractor [including Achromatic, Apochromatic, binoculars, and camera lenses] N = Newtonian reflector [including Dobsonian, Schmidt-Newtonian, Maksutov-Newtonian, Jones-Bird, Schiefspiegler] C = Cassegrain (including Schmidt-Cassegrain, Maksutov, Ritchy-Chretien, Dall-Kirkham) O = Other, including naked eye. Note (31): the code for Telescope mounting is: E = Equatorial mounting A = Alt-Azimuth mounting Note (32): the code for Telescope drive is: D = Driven M = Manual
Acknowledgements: This catalog was prepared with the assistance of Breit D., Coles K., Dunham D., Loader B., Manek J., Miyashita K., Sandy R., and Soma M. History: * 25-Oct-2010: Original version, prepared by IOTA (461692 occultations) * 01-Sep-2012: Version 'A', from Dave Herald [IOTA]. The changes are: -- addition of 2 years of observations (467974 occultations) -- reduction of the pre-1800 observations using DE422 (rather than DE414)
(End) Dave Herald [IOTA], Francois Ochsenbein [CDS] 01-Sep-2012
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