The orbit, mass, size, albedo, and density of (65489) Ceto/Phorcys: A tidally-evolved binary Centaur

被引：48
作者：
Grundy, W. M.
Stansberry, J. A.
Noll, K. S.
Stephens, D. C.
Trilling, D. E.
Kern, S. D.
Spencer, J. R.
Cruikshank, D. P.
Levison, H. F.
机构：
[1] Lowell Observ, Flagstaff, AZ 86001 USA
[2] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[3] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[4] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[5] SW Res Inst, Boulder, CO 80302 USA
[6] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA
来源：
ICARUS | 2007年 / 191卷 / 01期
基金：
美国国家航空航天局;
关键词：
Centaurs; Kuiper belt; trans-neptunian objects; satellites;
D O I：
10.1016/j.icarus.2007.04.004
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Hubble Space Telescope observations of Uranus- and Neptune-crossing object (65489) Ceto/Phorcys (provisionally designated 2003 FX128) reveal it to be a close binary system. The mutual orbit has a period of 9.554 +/- 0.011 days and a semimajor axis of 1840 +/- 48 km. These values enable computation of a system mass of (5.41 +/- 0.42) x 10(18) kg. Spitzer Space Telescope observations of thermal emission at 24 and 70 Pin are combined with visible photometry to constrain the system's effective radius (109(-11)(+10) km) and geometric albedo (0.084(-0.014)(+0.021)) We estimate the average bulk density to be 1.37-(+0.66)(0.32) gcm(-3), consistent with ice plus rocky and/or carbonaceous materials. This density contrasts with lower densities recently measured with the same technique for three other comparably-sized outer Solar System binaries (617) Patroclus, (26308) 1998 SM165, and (47171) 1999 TC36, and is closer to the density of the saturnian irregular satellite Phoebe. The mutual orbit of Ceto and Phorcys is nearly circular. with an eccentricity <= 0.015. This observation is consistent with calculations suggesting that the system should tidally evolve on a timescale shorter than the age of the Solar System. (C) 2007 Elsevier Inc. All rights reserved.
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页码：286 / 297
页数：12
相关论文
共 73 条
[1]   Deep Impact: Excavating comet Tempel 1 [J].
A'Hearn, MF ;
Belton, MJS ;
Delamere, WA ;
Kissel, J ;
Klaasen, KP ;
McFadden, LA ;
Meech, KJ ;
Melosh, HJ ;
Schultz, PH ;
Sunshine, JM ;
Thomas, PC ;
Veverka, J ;
Yeomans, DK ;
Baca, MW ;
Busko, I ;
Crockett, CJ ;
Collins, SM ;
Desnoyer, M ;
Eberhardy, CA ;
Ernst, CM ;
Farnham, TL ;
Feaga, L ;
Groussin, O ;
Hampton, D ;
Ipatov, SI ;
Li, JY ;
Lindler, D ;
Lisse, CM ;
Mastrodemos, N ;
Owen, WM ;
Richardson, JE ;
Wellnitz, DD ;
White, RL .
SCIENCE, 2005, 310 (5746) :258-264
[2]   Neptune's capture of its moon Triton in a binary-planet gravitational encounter [J].
Agnor, CB ;
Hamilton, DP .
NATURE, 2006, 441 (7090) :192-194
[3]  
[Anonymous], IAU S
[4]  
Binney J., 2008, Galactic Dynamics, V2nd ed.
[5]   Results from the ESO large program on Transneptunian Objects and Centaurs [J].
Boehnhardt, H ;
Barucci, A ;
Delsanti, A ;
De Bergh, C ;
Doressoundiram, A ;
Romon, J ;
Dotto, E ;
Tozzi, G ;
Lazzarin, M ;
Fornasier, S ;
Peixinho, N ;
Hainaut, O ;
Davies, J ;
Rousselot, P ;
Barrera, L ;
Birkle, K ;
Meech, K ;
Ortiz, J ;
Sekiguchi, T ;
Watanabe, J ;
Thomas, N ;
West, R .
EARTH MOON AND PLANETS, 2003, 92 (1-4) :145-156
[6]  
BOWELL E, 1989, ASTEROIDS 2
[7]  
BROWN E, 2006, AAS DPS M PAS CA 200
[8]   Orbits and photometry of Pluto's satellites: Charon, S/2005 P1, and S/2005 P2 [J].
Buie, Marc W. ;
Grundy, William M. ;
Young, Eliot F. ;
Young, Leslie A. ;
Stern, S. Alan .
ASTRONOMICAL JOURNAL, 2006, 132 (01) :290-298
[9]  
Burns J. A., 1986, SATELLITES
[10]   Proton irradiation of Centaur, Kuiper Belt, and Oort Cloud objects at plasma to cosmic ray energy [J].
Cooper, JF ;
Christian, ER ;
Richardson, JD ;
Wang, C .
EARTH MOON AND PLANETS, 2003, 92 (1-4) :261-277
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