Asteroids with Satellites Database--Johnston's Archive
(7344)
Summerfield
compiled by Wm. Robert Johnston
last updated
27 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: |
2.586592478 AU
| |
orbital period P: |
4.159987402 yr
(= 1519.464096 d)
| |
eccentricity e: |
0.113456739
| |
perihelion distance q: |
2.29312613 AU
| |
aphelion distance Q: |
2.880058826 AU
| |
inclination i: |
14.3197896°
| |
argument of perihelion ω: |
17.454071°
| |
ascending node Ω: |
175.030812°
| |
mean anomaly M: |
64.235206°
| |
perihelion passage TP: |
2016 Dec 06.880307
| |
Epoch: |
2017 Sep 04
| |
data arc: |
1985-2017
(1259 obs.)
| |
Earth MOID: |
1.29951 AU
| |
Jupiter Tisserand invariant TJ: |
3.369
|
orbital data, secondary:
|
semimajor axis as: |
11
km
[*E]
| |
orbital period Ps: |
0.7254
± 0.0004
d [P17i]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
13
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
6.25
± 0.28
km [M11b]
| |
geometric albedo: |
0.343
± 0.068
[M11b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
1100 km [*E]
|
other data, primary:
|
diameter dp: |
6.15
± 0.28
km [*D]
| |
rotation period RPp: |
2.59
± 0
h [P17i]
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
1.11
± 0.19
km [*D]
| |
diameter ratio ds/dp: |
0.18
± 0.03
[P17i]
| |
component mag. difference ΔM: |
3.72
± 0.37
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(7344) Summerfield
--discovery and notes:
Primary discovered
1992 Jun 04
from
Palomar Observatory, California, USA
by
C. S. Shoemaker.
Alternate designation(s):
1992 LU,
1971 HN.
Linked to prediscovery observations from 1971.
Permanent number assigned 1996 Dec 24.
Named 1997 Aug 18 for Robert and Lisa Summerfield [MPC030478].
Companion discovered
2017
by D. Pray, P. Pravec, H. Kucakova, K. Hornoch, P. Kusnirak, V. Chiorny, N. Gaftonyuk, V. Benishek
using
lightcurve
observations.
Announced
2017 Jul 05 [P17#].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2017, 2019
by Wm. Robert Johnston.
Last modified
27 May 2019.
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