Asteroids with Satellites Database--Johnston's Archive
(2815)
Soma
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: |
2.232596959 AU
| |
orbital period P: |
3.335981976 yr
(= 1218.4674170 d)
| |
eccentricity e: |
0.169407399
| |
perihelion distance q: |
1.85437852 AU
| |
aphelion distance Q: |
2.610815403 AU
| |
inclination i: |
5.7049116°
| |
argument of perihelion ω: |
237.653466°
| |
ascending node Ω: |
119.882179°
| |
mean anomaly M: |
173.832957°
| |
perihelion passage TP: |
2012 Oct 11.63946
| |
Epoch: |
2014 May 23
| |
data arc: |
1955-2014
(1389 obs.)
| |
Earth MOID: |
0.855837 AU
| |
Jupiter Tisserand invariant TJ: |
3.615
|
orbital data, secondary:
|
binary dynamical type: | A [M09a] | |
semimajor axis as: |
13
km
[*E]
| |
separation/primary radius as/rp: | 3.7 [*E] | |
separation/Hill radius as/rH: | 0.013 [*E] | |
orbital period Ps: |
0.7465
± 0.00008
d [P11c]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
0.81
[M09a]
|
|
other data, system (combined):
|
absolute mag. H: |
12.6
[MPC]
12.53 ± 0.02 [P11c]
| |
slope parameter G: |
0.27 [P11c]
| |
effective diameter dE: |
7.16
± 0.09
km [M11b]
| |
geometric albedo: |
0.321
± 0.041
[M11b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
1000 km [*E]
|
other data, primary:
|
diameter dp: |
6.95
± 0.09
km [*D]
| |
rotation period RPp: |
2.73325
± 0.00007
h [P11c]
| |
amplitude in mag., rotational ΔM: |
0.07
[P11c]
| |
amplitude in mag., mutual events ΔM: | 0.095 ±0.025 [P11c] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
1.74
± 0.14
km [*D]
| |
diameter ratio ds/dp: |
0.25
± 0.02
[P11c]
| |
component mag. difference ΔM: |
3.0
± 0.2
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(2815) Soma
--discovery and notes:
Primary discovered
1982 Sep 15
from
Anderson Mesa Station, Arizona, USA
by
E. Bowell.
Alternate designation(s):
1982 RL,
1955 MH, 1970 AC, 1974 DL, 1979 XB1.
Linked to prediscovery observations from 1955 Jun 22.
Permanent number assigned 1983 Jan.
Named 1984 Sep 10 for the Soma cube game [MPC9080].
Companion discovered
2011 Mar 07
by J. Pollock, P. Pravec, P. Kusnirak, K. Hornoch, V. Chiorny, S. Gajdos, D. E. Reichart, K. M. Ivarsen, J. B. Haislip, and A. LaCluyze
using
lightcurve
observations from Appalachian State University, North Carolina, USA; Ondrejov Observatory, Czech Republic; Kharkiv Observatory, Ukraine; Modra Observatory, Slovakia; University of North Carolina at Chapel Hill, North Carolina, USA.
Announced
2011 Apr 21 [P11c].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Marchis, F., Enriquez, J. E., Allain, M., & Emery, J. P. 2011, Central Bureau Electronic Telegrams (2815) soma.
- Pollock, J., Pravec, P., Kusnirak, P., Hornoch, K., Chiorny, V., Gajdos, S., Reichart, D. E., Ivarsen, K. M., Haislip, J. B., Lacluyze, A., Marchis, F., Enriquez, J. E., Allain, M., & Emery, J. P. 2011, Central Bureau Electronic Telegrams (2815) Soma
©
2011, 2014
by Wm. Robert Johnston.
Last modified
21 September 2014.
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