Asteroids with Satellites Database--Johnston's Archive

(2754) Efimov

compiled by Wm. Robert Johnston
last updated 29 May 2019

--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: 2.228642262 AU
orbital period P: 3.327122146 yr
(= 1215.231364 d)
eccentricity e: 0.232298177
perihelion distance q: 1.710932727 AU
aphelion distance Q: 2.746351797 AU
inclination i: 5.710513817°
argument of perihelion ω: 91.20624052°
ascending node Ω: 275.2021076°
mean anomaly M: 104.4952564°
perihelion passage TP: 2013 Jun 04.26135
Epoch: 2014 May 23
data arc: 1951-2014 (1104 obs.)
Earth MOID: 0.719986 AU
Jupiter Tisserand invariant TJ: 3.602

orbital data, secondary:
binary dynamical type:A [P07f]
semimajor axis as: 9.8 km [*E]
separation/primary radius as/rp:3.2 [*E]
separation/Hill radius as/rH:0.012 [*E]
orbital period Ps: 0.6152 ± 0.0004 d [P06c]
eccentricity es: ?
normalized ang. mom. αL: 1.08 [P07f]

other data, system (combined):
absolute mag. H: 13.6 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 6.29 km [*E]
geometric albedo: (0.16 ) [*A]
color index U-B: ?
color index B-V: ?
taxonomic type: Sa (SMASSII) [JPL]
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 820 km [*E]

other data, primary:
diameter dp: 6.17 km [*E]
rotation period RPp: 2.4497 ± 0.0002 h [P06c]
amplitude in mag., rotational ΔM: 0.15 [P06c]
amplitude in mag., mutual events ΔM:0.065 ±0.025 [P06c]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 1.23 km [*E]
diameter ratio ds/dp: 0.2 ± 0.03 [P06c]
component mag. difference ΔM: 3.49 ± 0.33 [*D]
rotation period RPs: ?

-- (2754) Efimov --discovery and notes:

Primary discovered 1966 Aug 13 from Nauchnyj, Crimea, Ukraine, USSR by T. M. Smirnova. Alternate designation(s): 1966 PD, 1933 WF, 1966 RB, 1973 YR1. Linked to prediscovery observations from 1951 Feb 04. Permanent number assigned 1982.

Named 1988 May 31 for Mikhail Nikiforovich Efimov (1881-1919) [MPC013173].

Companion discovered 2006 Aug 14 by D. Pray, P. Pravec, M. Pikler, M. Husarik, R. Stephens, G. Masi, R. Durkee, and R. Goncalves using lightcurve observations from Carbuncle Hill Observatory, Greene, Rhode Island, USA; Ondrejov Observatory, Czech Republic; Skalnate Pleso Observatory; Goat Mountain Astronomical Research Station, Yucca Valley, California; Bellatrix Observatory, Ceccano, Italy; Minneapolis, MN; Linhaceira, Tomar, Portugal. Announced 2006 Sep 04 [P06c].

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--Links to ADS abstracts:

© 2006-2014, 2019 by Wm. Robert Johnston.
Last modified 29 May 2019.
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