Asteroids with Satellites Database--Johnston's Archive

(317) Roxane and Olympias

compiled by Wm. Robert Johnston
last updated 6 December 2020

--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: 2.286745014 AU
orbital period P: 3.458078228 yr
(= 1263.063073 d)
eccentricity e: 0.085547846
perihelion distance q: 2.091118903 AU
aphelion distance Q: 2.482371126 AU
inclination i: 1.765342063°
argument of perihelion ω: 187.0923627°
ascending node Ω: 151.3808886°
mean anomaly M: 171.1049308°
perihelion passage TP: 2012 Sep 29.6768
Epoch: 2014 May 23
data arc: 1891-2014 (1642 obs.)
Earth MOID: 1.08058 AU
Jupiter Tisserand invariant TJ: 3.596

orbital data, secondary:
semimajor axis as: 247 ± 1.2 km [D17a]
separation/primary radius as/rp:24.9 [*E]
separation/Hill radius as/rH:0.076 [*E]
orbital period Ps: 11.54 ± 0.07 d [D17a]
eccentricity es: 0.078 ± 0.16 [D17a]
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 10.03 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 20.56 km [*D]
geometric albedo: 0.525 ± 0.079 [M11b]
color index U-B: 0.238 [JPL]
color index B-V: 0.694 [JPL]
taxonomic type: Xe (SMASSII) [JPL]
E (Tholen) [JPL]
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 3200 km [*E]

other data, primary:
diameter dp: 19.86 ± 0.12 km [M11b]
rotation period RPp: 8.169 ± 0 h [H92a]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 5.3 km [D10a]
diameter ratio ds/dp: 0.267 [*D]
component mag. difference ΔM: 2.9 [*D]
rotation period RPs: ?

-- (317) Roxane and Olympias --discovery and notes:

Primary discovered 1891 Sep 11 from Nice, France by A. Charlois. Permanent number assigned 1891.

Named 1893 for Roxana (~343 BC-~310 BC).

Companion discovered 2009 Nov 24 by W. J. Merline, P. M. Tamblyn, J. D. Drummond, J. C. Christou, A. R. Conrad, B. Carry, C. R. Chapman, C. Dumas, D. D. Durda, W. M. Owen, and B. L. Enke using adaptive optics telescope observations from Gemini North Telescope, Mauna Kea, Hawaii, USA. Announced 2009 Oct 26 [M09b]. Provisional designation S/2009 (317) 1.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2009-2019, 2020 by Wm. Robert Johnston.
Last modified 6 December 2020.
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