Asteroids with Satellites Database--Johnston's Archive

(21436) Chaoyichi

compiled by Wm. Robert Johnston
last updated 7 September 2015

--Orbital and physical data--

(See this page for definitions of quantities; source codes in brackets, see this 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 axis a: 2.186466611 AU
orbital period P: 3.233063798 yr
(= 1180.8988549 d)
eccentricity e: 0.085062306
perihelion distance q: 2.00048072 AU
aphelion distance Q: 2.372452503 AU
inclination i: 3.7371649°
argument of perihelion ω: 178.176309°
ascending node Ω: 320.375977°
mean anomaly M: 104.339255°
perihelion passage TP: 2013 Dec 31.7386
Epoch: 2014 Dec 09
data arc: 1989-2015 (883 obs.)
Earth MOID: 1.01415 AU
Jupiter Tisserand invariant TJ: 3.669


orbital data, secondary:
semimajor axis as: ?
orbital period Ps: ?
eccentricity es: 0.1 [P15f]
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 15.3 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 1.95 ± 0.26 km [M11b]
geometric albedo: 0.222 ± 0.062 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 280 km [*E]

other data, primary:
diameter dp: 1.8 km [*E]
rotation period RPp: 2.87 h [JPL]
amplitude in mag., rotational ΔM: 0.05 [lcdb]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 0.6 km [*E]
diameter ratio ds/dp: 0.35 ± 0.1 [P15f]
component mag. difference ΔM: 2.3 [*D]
rotation period RPs: ?

-- (21436) Chaoyichi --discovery and notes:

Primary discovered 1998 Mar 31 from Socorro, New Mexico, USA by 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-) [MPC57273].

Companion discovered 2014 by Pravec, P., P. Scheirich, P. Kusnirak, K. Hornoch, and A. Galad using lightcurve observations. Announced 2015 Aug 05 [P15f].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2015 by Wm. Robert Johnston.
Last modified 7 September 2015.
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