Asteroids with Satellites Database--Johnston's Archive

(2121) Sevastopol

compiled by Wm. Robert Johnston
last updated 21 September 2014

--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: 2.183210944 AU
orbital period P: 3.225906323 yr
(= 1178.2622850 d)
eccentricity e: 0.178710897
perihelion distance q: 1.79304736 AU
aphelion distance Q: 2.573374530 AU
inclination i: 4.3764854°
argument of perihelion ω: 159.985117°
ascending node Ω: 145.732206°
mean anomaly M: 88.854949°
perihelion passage TP: 2013 Aug 05.18212
Epoch: 2014 May 23
data arc: 1936-2014 (1413 obs.)
Earth MOID: 0.777982 AU
Jupiter Tisserand invariant TJ: 3.654


orbital data, secondary:
semimajor axis as: 26 km [*E]
separation/primary radius as/rp:6.0 [*E]
separation/Hill radius as/rH:0.021 [*E]
orbital period Ps: 1.546 d [H10a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 12.1 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 9.32 ± 0.04 km [M11b]
geometric albedo: 0.248 ± 0.022 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1200 km [*E]

other data, primary:
diameter dp: 8.62 ± 0.04 km [*D]
rotation period RPp: 2.90640 ± 0.00002 h [H10a]
amplitude in mag., rotational ΔM: 0.20 [H10a]
amplitude in mag., mutual events ΔM:0.2 [H10a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 3.54 ± 0.17 km [*D]
diameter ratio ds/dp: 0.41 ± 0.02 [H10a]
component mag. difference ΔM: 1.9 ± 0.1 [*D]
rotation period RPs: ?

-- (2121) Sevastopol --discovery and notes:

Primary discovered 1971 Jun 27 from Nauchnyj, Crimea, Ukraine, USSR by T. M. Smirnova. Alternate designation(s): 1971 ME, 1932 HM, 1936 WD, 1938 DY, 1939 TO, 1952 SZ, 1968 QJ1, 1977 ED2, 1978 WG. Linked to prediscovery observations from 1936 Nov 17. Permanent number assigned -.

Named 1983 Jan 28 for the city of Sevastopol, Crimea, Ukraine [MPC7616].

Companion discovered 2010 Jul 23 by D. Higgins, P. Pravec, P. Kusnirak, J. Pollock, J. Oey, M. Husarik, G. Cervak, D. E. Reichart, K. M. Ivarsen, J. B. Haislip, and A. LaCluyze using lightcurve observations from Canberra, Australia; Ondrejov Observatory, Czech Republic; Appalachian State University, North Carolina, USA; Leura, New South Wales, Australia; Skalnate Pleso Observatory; University of North Carolina, Chapel Hill. Announced 2010 Aug 26 [H10a].

--Links, more technical:

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--Links to ADS abstracts:


© 2010, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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