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J/A+A/380/347 BVRI photometry of 27 Kuiper Belt Objects (Delsanti+, 2001)
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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
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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 SM_55_, 1998
UR_43_, 1999CF_119_ and 2000 OK_67_) show evidence of changing color,
and should be investigated further. The object 1995 SM_55_ 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)
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 <adelsant@eso.org>
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(End) Patricia Bauer [CDS] 26-Nov-2001