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Asteroids with Satellites Database--Johnston's Archive
(2754) Efimov
compiled by Wm. Robert Johnston
last updated29 May 2019--Orbital and physical data--
(Seethis page for definitions of quantities; source codes in brackets, seethis 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 axisa: | 2.228642262 AU | | orbital periodP: | 3.327122146 yr
(= 1215.231364 d) | | eccentricitye: | 0.232298177 | | perihelion distanceq: | 1.710932727 AU | | aphelion distanceQ: | 2.746351797 AU | | inclinationi: | 5.710513817° | | argument of perihelionω: | 91.20624052° | | ascending nodeΩ: | 275.2021076° | | mean anomalyM: | 104.4952564° | | perihelion passageTP: | 2013 Jun 04.26135 | | Epoch: | 2014 May 23 | | data arc: | 1951-2014(1104 obs.) | | Earth MOID: | 0.719986 AU | | Jupiter Tisserand invariantTJ: | 3.602 |
orbital data, secondary: | binary dynamical type: | A [P07f] | | semimajor axisas: | 9.8 km[*E] | | separation/primary radiusas/rp: | 3.2 [*E] | | separation/Hill radiusas/rH: | 0.012 [*E] | | orbital periodPs: | 0.6152± 0.0004d [P06c] | | eccentricityes: | ? | | normalized ang. mom.αL: | 1.08[P07f] |
| other data, system (combined):| absolute mag.H: | 13.6[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 6.29 km [*E] | | geometric albedo: | (0.16) [*A] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | Sa (SMASSII) [JPL] | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 820 km [*E] |
other data, primary: | diameterdp: | 6.17 km [*E] | | rotation periodRPp: | 2.4497± 0.0002h [P06c] | | amplitude in mag., rotationalΔM: | 0.15 [P06c] | | amplitude in mag., mutual eventsΔM: | 0.065 ±0.025 [P06c] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 1.23km [*E] | | diameter ratiods/dp: | 0.2± 0.03 [P06c] | | component mag. differenceΔM: | 3.49± 0.33 [*D] | | rotation periodRPs: | ? | |
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--(2754) Efimov --discovery and notes:
Primary discovered1966 Aug 13from Nauchnyj, Crimea, Ukraine, USSRby 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 discovered2006 Aug 14 by D. Pray, P. Pravec, M. Pikler, M. Husarik, R. Stephens, G. Masi, R. Durkee, and R. Goncalvesusinglightcurve 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.Announced2006 Sep 04 [P06c].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Pray, D., Pravec, P., Pikler, M., Husarik, M., Stephens, R., Masi, G., Durkee, R., & Goncalves, R. 2006, Central Bureau Electronic Telegrams(2754) Efimov
- Bus, S. & Binzel, R. P. 2004, NASA Planetary Data System2754 Efimov CCD Spectrum
©2006-2014, 2019by Wm. Robert Johnston.
Last modified29 May 2019.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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