Asteroids with Satellites Database--Johnston's Archive

(2343) Siding Spring

compiled by Wm. Robert Johnston
last updated 1 December 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: 2.3344250913 AU
orbital period P: 3.566727365 yr
(= 1302.7717745 d)
eccentricity e: 0.255503133
perihelion distance q: 1.73797217 AU
aphelion distance Q: 2.930878016 AU
inclination i: 1.7636641°
argument of perihelion ω: 155.03069°
ascending node Ω: 218.15104°
mean anomaly M: 338.3703411°
perihelion passage TP: 2015 Sep 13.273636
Epoch: 2015 Jun 27
data arc: 1965-2015 (1433 obs.)
Earth MOID: 0.738891 AU
Jupiter Tisserand invariant TJ: 3.524

orbital data, secondary:
semimajor axis as: 7 km [*E]
separation/primary radius as/rp:2.7 [*E]
separation/Hill radius as/rH:0.010 [*E]
orbital period Ps: 0.49121 ± 0.00012 d [P15i]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.3 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 5.2 ± 0.31 km [M11b]
geometric albedo: 0.376 ± 0.092 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 690 km [*E]

other data, primary:
diameter dp: 5.11 km [*D]
rotation period RPp: 2.10637 ± 0.00008 h [P15i]
amplitude in mag., rotational ΔM: 0.15 [P15i]
amplitude in mag., mutual events ΔM:0.05 ±0.01 [P15i]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: >0.97 km [*D]
diameter ratio ds/dp: >0.19 [P15i]
component mag. difference ΔM: <3.6 [*D]
rotation period RPs: ?

-- (2343) Siding Spring --discovery and notes:

Primary discovered 1979 Jun 25 from Siding Spring, New South Wales, Australia by E. F. Helin, S. J. Bus. Alternate designation(s): 1979 MD4, 1940 RQ, 1951 YU1, 1965 SM, 1972 RZ, 1976 YV7, 1977 AV. Linked to prediscovery observations from 1940. Permanent number assigned 1981 Feb 01.

Named 1981 Mar 01 for the community in New South Wales, Australia [MPC5851].

Companion discovered 2015 Oct 06 by J. Pollock, D. Caton, R. Hawkins, P. Pravec, D. Pray, W. Cooney, J. Gross, D. Terrell, J. Oey, V. Benishek, A. Galad, S. Gajdos, R. Groom, K. Stranger, V. Chiorny, D. Reichart, J. Haislip, and A. Smith using lightcurve observations from Dark Sky Observatory, Boone, NC, USA; Sugarloaf Mountain Observatory; Sonoita Research Observatory, Sonoita, AZ, USA; Blue Mountains Observatory; Sopot Observatory, Serbia; Modra Observatory; Perth Observatory; Kharkiv Observatory, Ukraine. Announced 2015 Dec 01 [P15i].

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--Links to ADS abstracts:

© 2015 by Wm. Robert Johnston.
Last modified 1 December 2015.
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