(2754) Efimov

compiled by Wm. Robert Johnston
last updated 28 November 2008

Orbital elements and other data (Assumed or derived values in parenthesis, my estimates in italics and parenthesis. Source identifications in brackets, see this link for sources):

orbital data, primary (osculating elements) [JPL]:
semimajor axis a: 2.2279303 AU
orbital period P: 3.33 y (=1,214.64907 d)
eccentricity e: 0.2320283
perihelion distance q: 1.7109874 AU
aphelion distance Q: 2.7448732 AU
inclination i: 5.71288°
argument of perihelion omega: 91.14314°
ascending node OMEGA: 275.26051°
mean anomaly M: 354.76065°
perihelion passage TP: 2006-10-09.67770
Epoch: 22 SEP 2006
data arc: 1951-1999 (58 obs.)

orbital data, secondary:
semimajor axis a: (9.5 km?)
semimajor axis/primary radius a/Rp: (3.3?)
orbital period P: 14.765±0.01 h [C617]
eccentricity e: ?

other data, primary:
diameter: (6 km?)
absolute magnitude H: 13.5 [JPL]
rotation period: 2.4497±0.0002 h [C617]
amplitude delta M: 0.15; 0.04-0.09 [C617]
color index U-B: ?
color index B-V: ?
color index V-R: ?
color index R-I: ?
slope parameter G: (0.15) assumed
geometric albedo: (0.20) assumed
mass: ?
density: ?
type: Sa [JPL]

other data, secondary:
diameter: (1.2 km?)
diameter ratio Ds/Dp: 0.20 ± 0.03 [C617]
component magnitude difference: (3.5)
rotation period: ?

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

Discovered 13 August 1966 by T. Smirnova from Nauchnyj. Other designations 1966 PD, 1933 WF, 1966 RB, 19773 YR1.

Secondary identified by D. Pray, P. Pravec, M. Pikler, M. Husarik, R. Stephens, G. Masi, R. Durkee, and R. Goncalves et al. based on lightcurve observations of 14 August-1 September 2006 from Carbuncle Hill Observatory, Skalnate Pleso Observatory, Goat Mountain Astronomical Research Station, Bellatrix Observatory, Shed of Science Observatory, and Linhaceira Observatory; reported 4 September 2006.

See more information and links at Asteroid/Comet Connection Catchall Catalog page

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2006, 2008 by Wm. Robert Johnston.
Last modified 28 November 2008.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.