Asteroids with Satellites Database--Johnston's Archive

(44620) 1999 RS43

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: 2.176320153 AU
orbital period P: 3.210585024 yr
(= 1172.688328 d)
eccentricity e: 0.164202154
perihelion distance q: 1.8189637 AU
aphelion distance Q: 2.53367661 AU
inclination i: 4.398687°
argument of perihelion ω: 180.916159°
ascending node Ω: 182.017649°
mean anomaly M: 285.380881°
perihelion passage TP: 2015 Aug 09.069359
Epoch: 2014 Dec 09
data arc: 1998-2015 (711 obs.)
Earth MOID: 0.816511 AU
Jupiter Tisserand invariant TJ: 3.663


orbital data, secondary:
semimajor axis as: 2 km [*D]
separation/primary radius as/rp:6.2 [P15f]
separation/Hill radius as/rH:0.021 [*E]
orbital period Ps: ?
eccentricity es: 0 [P15f]
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 15.5 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 2.62 km [*E]
geometric albedo: (0.16 ) [*A]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 90 km [*E]

other data, primary:
diameter dp: 0.66 km [P15f]
rotation period RPp: 2.9 ± 0.5 h [P15f]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 0.2 km [*E]
diameter ratio ds/dp: 0.35 ± 0.1 [P15f]
component mag. difference ΔM: 2.3 [*D]
rotation period RPs: ?

-- (44620) 1999 RS43 --discovery and notes:

Primary discovered 1999 Sep 12 from Visnjan by K. Korlevic. Alternate designation(s): 1999 HX81. Linked to prediscovery observations from 1998 Apr 21. Permanent number assigned 2002 Aug 22.

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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