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J/AJ/134/1133       Fraction of contact binary trojan asteroids   (Mann+, 2007)

Fraction of contact binary trojan asteroids. Mann R.K., Jewitt D., Lacerda P. <Astron. J., 134, 1133-1144 (2007)> =2007AJ....134.1133M
ADC_Keywords: Surveys ; Planets Keywords: minor planets, asteroids - solar system: general - surveys Abstract: We present the results of an optical light-curve survey of 114 Jovian Trojan asteroids conducted to determine the fraction of contact binaries. Sparse sampling was used to assess the photometric range of the asteroids, and those showing the largest ranges were targeted for detailed follow-up observations. This survey led to the discovery of two Trojan asteroids, (17365) and (29314), displaying large light-curve ranges (∼1mag) and long rotation periods (<2rotations/day) consistent with a contact binary nature. Description: We obtained sparsely sampled optical light-curve data for the Jovian Trojan asteroids using both the University of Hawaii (UH) 2.2m telescope on Mauna Kea and the Lulin 1m Telescope (LOT) in Taiwan, between 2005 Mar 7 and 2006 May 1. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 62 114 Photometry of Jovian Trojan asteroids table3.dat 45 114 Geometric and photometric properties of Jovian Trojan asteroids
See also: B/astorb : Orbits of Minor Planets (Bowell+ 2009) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Num ? Planet number 7- 17 A11 --- Name Trojan name 19- 21 A3 --- Tel Telescope used in observation (1) 23- 27 F5.2 mag RMAG Mean absolute R band magnitude 29- 33 F5.2 mag R1-R First R band magnitude minus Mean R band magnitude 35- 39 F5.2 mag R2-R Second R band magnitude minus Mean R band magnitude 41- 45 F5.2 mag R3-R Third R band magnitude minus Mean R band magnitude 47- 51 F5.2 mag R4-R Fourth R band magnitude minus Mean R band magnitude 53- 57 F5.2 mag R5-R ? Fifth R band magnitude minus Mean R band magnitude 59- 62 F4.2 mag DelR Photometric range in the R band
Note (1): Telescope as follows: UH = University of Hawaii 2.2-m telescope LOT = Taiwan Lulin One-meter Telescope
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Num ? Planet number 7- 17 A11 --- Name Trojan name 19- 23 F5.2 mag MAG Absolute magnitude (1) 25- 28 F4.2 AU Hdist Heliocentric distance 30- 33 F4.2 AU Gdist Geocentric distance 35- 38 F4.1 deg alpha Phase angle 40- 42 I3 km De Effective diameter (2) 44- 45 A2 --- L4/L5 The L4 or L5 location
Note (1): From equation mR(1,1,0)=mR-5log(r{DELTA})-βα, where α is the phase coefficient for which we used a value of 0.04mag/deg for the low-albedo Trojan asteroids. Note (2): From equation mR(1,1,0)=m-2.5log(p(De)2/(4*2.25*106)) where p is the geometric albedo, for which a value of 0.04 and m-27.1 is the apparent red magnitude of the Sun.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 03-Oct-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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