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].
--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 System 2754 Efimov CCD Spectrum
©
2006-2014, 2019
by Wm. Robert Johnston.
Last modified
29 May 2019.
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