J/AJ/151/117 R photometry of (225088) 2007 OR10 (Pal+, 2016)
Large size and slow rotation of the trans-neptunian object (225088) 2007 OR10
discovered from Herschel and K2 observations.
Pal A., Kiss C., Muller T.G., Molnar L., Szabo R., Szabo G.M.,
Sarneczky K., Kiss L.L.
<Astron. J., 151, 117-117 (2016)>
=2016AJ....151..117P 2016AJ....151..117P (SIMBAD/NED BibCode)
ADC_Keywords: Planets ; Photometry, VRI
Keywords: Kuiper belt objects: individual ((225088) OR10) -
methods: observational - minor planets, asteroids: general -
radiation mechanisms: thermal - techniques: photometric
Abstract:
We present the first comprehensive thermal and rotational analysis of
the second most distant trans-Neptunian object (TNOs)
(225088)2007OR10. We combined optical light curves provided by the
Kepler Space Telescope-K2 extended mission and thermal infrared data
provided by the Herschel Space Observatory. We found that
(225088)2007OR10 is likely to be larger and darker than derived by
earlier studies: we obtained a diameter of d=1535-225+75km which
places (225088) 2007OR10 in the biggest top three TNOs. The
corresponding visual geometric albedo is pV=0.089-0.009+0.031.
The light-curve analysis revealed a slow rotation rate of
Prot=44.81±0.37hr, superseded by very few objects. The most likely
light-curve solution is double-peaked with a slight asymmetry;
however, we cannot safely rule out the possibility of having a
rotation period of Prot=22.40±0.18hr, which corresponds to a
single-peaked solution. Due to the size and slow rotation, the shape
of the object should be a MacLaurin ellipsoid, so the light variation
should be caused by surface inhomogeneities. Its newly derived larger
diameter also implies larger surface gravity and a more likely
retention of volatiles--CH4, CO, and N2--on the surface.
Description:
Kepler observed the apparent track of 2007OR10 in K2 Campaign 3
under the Guest Observer Office proposal GO3053. Overall, Kepler
followed the light variations of 2007OR10 for 12.0 days
continuously.
Table:
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Planet Name H Diam i e a Prot
mag km deg AU day
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225088 2007 OR10 2.50 1535 30.927084 0.50676572 66.99209589 44.81
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 26 565 Photometric data of 2007 OR10
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See also:
B/astorb : Orbits of Minor Planets (Bowell+ 2014)
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
J/AJ/134/787 : Light curves of dwarf plutonian planets (Sheppard, 2007)
http://archive.stsci.edu/k2/ : MAST K2
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d JD Julian Date of the observation
15- 20 F6.3 mag mag [20.8/21.6] Transformed USNO-B1.0 R system
magnitude (1)
22- 26 F5.3 mag e_mag [0.037/0.191] Uncertainty in mag
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Note (1): See Section 2.1 in the text for further details.
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History:
From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 18-Jul-2016