Journal
ASTRONOMICAL JOURNAL
Volume 152, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/0004-6256/152/6/156
Keywords
Kuiper belt objects: individual (229762, 2007 UK126); occultations; planets and satellites: fundamental parameters
Categories
Funding
- National Science Foundation
- David and Lucile Packard Foundation Fellowship for Science and Engineering
- John Templeton Foundation
- NSF [AST-1212159, AST-1413287, AST-1413072]
- RECON
- European Research Council under the European Community's H (ERC) [669416]
- Spanish grant [AYA-2014-56637-C2-1-P]
- Proyecto de Excelencia de la Junta de Andaluca [2012-FQM1776]
- CAPES [BEX 9110/12-7, E-26/200.464/2015]
- CAPES/Brazil
- FAPERJ [E-01/2015/209545, E-26/111.488/2013]
- CNPq [308489/2013-6, 473002/2013-2, 308721/2011-0]
- CONACYT [167236]
- European Unions Horizon Research and Innovation Programme [687378]
- DCT
- National Science Foundation [AST-1005313]
- [CNPq-306885/2013]
- [CAPES/Cofecub-2506/2015]
- [FAPERJ/PAPDRJ-45/2013]
- [FAPERJ/CNE/05-2015]
- European Research Council (ERC) [669416] Funding Source: European Research Council (ERC)
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1413287] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1413072] Funding Source: National Science Foundation
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We present results derived from the first multi-chord stellar occultation by the trans-Neptunian object (229762) 2007 UK126, observed on 2014 November 15. The event was observed by the Research and Education Collaborative Occultation Network project and International Occultation Timing Association collaborators throughout the United States. Use of two different data analysis methods obtain a satisfactory fit to seven chords, yielding an elliptical fit to the chords with an equatorial radius of = R 338(-10)(+15) km and equivalent radius of = Req 319(-7)(+14) km. A circular fit also gives a radius of = R 324(-23)(+30) km. Assuming that the object is a Maclaurin spheroid with indeterminate aspect angle, and using two published absolute magnitudes for the body, we derive possible ranges for geometric albedo between p(V) = 0.159(-0.013) (+ 0.007) and p(R) = 0.189(-0.015)(+0.009), and for the body oblateness between is an element of= 0.105 (-0.040) (+0.050) and is an element of= 0.118 (-0.048) (+0.055). For a nominal rotational period of 11.05 hr, an upper limit for density of rho = 1740 kg m(-3) is estimated for the body.
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