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J/A+A/380/347    BVRI photometry of 27 Kuiper Belt Objects     (Delsanti+, 2001)

BVRI photometry of 27 Kuiper Belt Objects with ESO/ Very Large Telescope Delsanti A.C., Boehnhardt H., Barrera L., Meech K.J, Sekiguchi T., Hainaut O.R. <Astron. Astrophys. 380, 347 (2001)> =2001A&A...380..347D
ADC_Keywords: Minor planets ; Photometry, UBVRI Keywords: Kuiper Belt - techniques: photometry - minor planets, asteroids Abstract: We present visible (BVRI) photometric measurements of 27 Trans-Neptunian objects, obtained with the FORS2 instrument on the ESO/8m Very Large Telescope (Unit 2) from runs during September and November 2000. The objects display a broad and continuous range of colors from neutral-bluish to very red. Most of the objects also have a linear reflectivity spectrum over the VRI range. There is no evidence of a bimodal color distribution as has been previously reported by other groups. Several objects (1994 TB, 1995 SM55, 1998 UR43, 1999CF119 and 2000 OK67) show evidence of changing color, and should be investigated further. The object 1995 SM55 deserves a more complete study since its neutral-blue colors suggest it could be a good candidate for hosting cometary activity. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 74 52 Magnitudes obtained for Run 1 and 2 using a fixed aperture diameter table3.dat 82 32 Absolute magnitude and colors for all objects, obtained from the photometric measurement presented in table2
See also: J/A+AS/113/115 : Photometry and analysis of 27 asteroids (Lagerkvist+, 1995) J/A+A/375/275 : Asteroidal I, J, K in the DENIS Survey (Baudrand+ 2001) VII/108 : Asteroid II data base, Version March 1988 (Lagerkvist+, 1987) B/astorb : Orbits of Minor Planets (Bowell 2001) VII/91 : IRAS Asteroid and Comet Survey (Veeder+ 1986) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Object Object designation 11- 20 A10 "YYYY/MM/DD" Date UT date of observation 22- 26 F5.2 AU r Heliocentric distance at the epoch of observation 28- 32 F5.2 mag Bmag ? B magnitude 34- 37 F4.2 mag e_Bmag ? rms uncertainty on Bmag 39- 43 F5.2 mag Vmag ? V magnitude 45- 48 F4.2 mag e_Vmag ? rms uncertainty on Vmag 50- 54 F5.2 mag Rmag ? R magnitude 56- 59 F4.2 mag e_Rmag ? rms uncertainty on Rmag 61- 65 F5.2 mag Imag ? I magnitude 67- 70 F4.2 mag e_Imag ? rms uncertainty on Imag 72- 74 A3 --- Notes Individual notes, separated by comma (1)
Note (1): Individual notes: 1: Contamination by a nearby star. The magnitudes presented in this table have been corrected for this effect. 2: Possible variability. 3: Aperture diameter of 3 FWHM 4: Object weak in B frame 5: Bad seeing for some of the frames
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Object Object designation 11- 14 A4 --- Class Class (1) 16- 18 A3 --- Run [12ab (*)] Run of observation (2) 20- 24 F5.2 mag M11 ? Absolute magnitude 26- 29 F4.2 mag e_M11 ? rms uncertainty on M11 31- 35 F5.1 km R Estimation of the object radius using Russell (1916ApJ....43..173R) 37- 40 F4.1 km e_R rms uncertainty on R 42- 46 F5.2 10-4nm-1 S ? Spectral reddening gradient (in %/100nm) 48- 51 F4.2 10-4nm-1 e_S ? rms uncertainty on S (in %/100nm) 53- 56 F4.2 mag B-V ? B-V colour index 58- 61 F4.2 mag e_B-V ? rms uncertainty on B-V 63- 66 F4.2 mag V-R ? V-R colour index 68- 71 F4.2 mag e_V-R ? rms uncertainty on V-R 73- 76 F4.2 mag R-I ? R-I colour index 78- 81 F4.2 mag e_R-I ? rms uncertainty on R-I
Note (1): Class: QB1: Cubewano Plut: Plutino Scat: Scaterred Disk Object Cent: Centaur Note (2): Run (UT date): 1a=2000 Sep 04 1b=2000 Sep 05 2a=2000 Nov 29 2b=2000 Nov 30 (*)=compilation of Run 2a & 2b (29 and 30 Nov 2000) For objects measured during both runs, we present one value per run, in order to highlight any intrinsic change.
Acknowledgements: Audrey Delsanti
(End) Patricia Bauer [CDS] 26-Nov-2001
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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