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Asteroids with Satellites Database--Johnston's Archive
(21436) Chaoyichi
compiled by Wm. Robert Johnston
last updated29 May 2019--Orbital and physical data--
(Seethis page for definitions of quantities; source codes in brackets, seethis link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)
dynamical type, primary:main belt asteroid
orbital data, primary (osculating elements)[JPL]: | semimajor axisa: | 2.186466611 AU | | orbital periodP: | 3.233063798 yr
(= 1180.8988549 d) | | eccentricitye: | 0.085062306 | | perihelion distanceq: | 2.00048072 AU | | aphelion distanceQ: | 2.372452503 AU | | inclinationi: | 3.7371649° | | argument of perihelionω: | 178.176309° | | ascending nodeΩ: | 320.375977° | | mean anomalyM: | 104.339255° | | perihelion passageTP: | 2013 Dec 31.7386 | | Epoch: | 2014 Dec 09 | | data arc: | 1989-2015(883 obs.) | | Earth MOID: | 1.01415 AU | | Jupiter Tisserand invariantTJ: | 3.669 |
orbital data, secondary: | semimajor axisas: | 9.2 km[*E] | | separation/primary radiusas/rp: | 10 [*E] | | separation/Hill radiusas/rH: | 0.032 [*E] | | orbital periodPs: | 3.382± 0.0004d [W17a] | | eccentricityes: | 0.1[P15f] | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 15.3[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 1.95± 0.26 km [M11b] | | geometric albedo: | 0.222± 0.062[M11b] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 290 km [*E] |
other data, primary: | diameterdp: | 1.84± 0.25 km [] | | rotation periodRPp: | 2.865± 0h [W17a] | | amplitude in mag., rotationalΔM: | 0.05 [lcdb] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 0.64± 0.09 | | diameter ratiods/dp: | 0.35± 0.1 [P15f] | | component mag. differenceΔM: | 2.28± 0.64 [*D] | | rotation periodRPs: | ? | |
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--(21436) Chaoyichi --discovery and notes:
Primary discovered1998 Mar 31from Socorro, New Mexico, USAby LINEAR Program.Alternate designation(s):1998 FL116, 1999 RP63.Linked to prediscovery observations from 1989 Aug 30.Permanent number assigned 2001 Feb 08.
Named 2006 Jul 11 for Chao Yi-Chi (1988-) [MPC057273].
Companion discovered2014 by Pravec, P., P. Scheirich, P. Kusnirak, K. Hornoch, and A. Galadusinglightcurve observations.Announced2015 Aug 05 [P15f].
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--Links to ADS abstracts:
©2015, 2019by Wm. Robert Johnston.
Last modified29 May 2019.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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