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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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)
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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
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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 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
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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.
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Acknowledgements: Audrey Delsanti
(End) Patricia Bauer [CDS] 26-Nov-2001