Asteroids with Satellites Database--Johnston's Archive

(90) Antiope and S/2000 (90) 1

compiled by Wm. Robert Johnston
last updated 27 May 2014
under construction--testing upgrades!

--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: 3.154487052 AU
orbital period P: 5.602751053 yr (= 2046.4048220 d)
eccentricity e: 0.163458400
perihelion distance q: 2.63885965 AU
aphelion distance Q: 3.670114457 AU
inclination i: 2.2071403°
argument of perihelion ω: 244.40561°
ascending node Ω: 70.04471°
mean anomaly M: 188.255621°
perihelion passage TP: 2017 Jan 23.27368
Epoch: 2014 May 23
data arc: 1866-2014 (2754 obs.)
Earth MOID: 1.62499 AU
Jupiter Tisserand invariant TJ: 3.185


orbital data, secondary:
binary dynamical type:O [P07f]
semimajor axis as: 171 ± 1 km [D07a]
separation/primary radius as/rp:3.9 [*D]
separation/Hill radius as/rH:0.0084 [*D]
orbital period Ps: 0.6877 ± 0.000004 d [D07a]
eccentricity es: 0.003 ± 0.003 [D07a]
inclination is:63.7°± 2.0 [D07a]
normalized ang. mom. αL: 1.24 [P07f]

other data, system (combined):
absolute mag. H: 8.27 [MPC]
slope parameter G: 0.15 [*A]
effective diameter dE: 121 km [*D]
geometric albedo: 0.062 ± 0.007 [M11b]
color index U-B: 0.317 [T95a]
color index B-V: 0.688 [T95a]
taxonomic type: C (SMASSII) [JPL]
C (Tholen) [JPL]
mass m: 8.28x1017 ± 2.2x1016 kg [D07a]
density ρ: 1.25 ± 0.05 g/cm3 [D07a]
Hill radius rH: 20000 km [*D]

other data, primary:
diameter dp: 87.8 ± 1 km [D07a]
dimensions :93.0x87.0x83.6km [D07a]
rotation period RPp: 16.5051 ± 0.0001 h [D07a]
amplitude in mag., rotational ΔM: 0.7 [D07a]
pole direction : ? ; ?


other data, secondary:
diameter ds: 83.8 ± 1.0 km [D07a]
dimensions :89.4x82.8x79.6km [D07a]
diameter ratio ds/dp: 0.954 ± 0.016 [*D]
component mag. difference ΔM: 0.1 [I7503]
rotation period RPs: 16.5051 ± 0.0001 h [D07a]

-- (90) Antiope and S/2000 (90) 1 --discovery and notes:

Primary discovered 1866 Oct 01 from Düsseldorf, Germany by R. Luther. Alternate designation(s): 1952 BK2. Permanent number assigned 1866 Oct 25.

Named 1866 Oct 25.

Companion discovered 2000 Aug 10 by W. J. Merline, L. M. Close, J. C. Shelton, C. Dumas, F. Menard, C. R. Chapman, and D. C. Slater using AOT observations from W. M. Keck II Telescope, Mauna Kea, Hawaii, USA. Announced 2000 Oct 03 [I7503]. Provisional designation S/2000 (90) 1.

--Links, more technical:

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--Links to ADS abstracts:


© 2001-2008, 2014 by Wm. Robert Johnston.
Last modified 27 May 2014.
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