Asteroids with Satellites Database--Johnston's Archive

(7344) Summerfield

compiled by Wm. Robert Johnston
last updated 16 July 2017

--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: 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: ?
orbital period Ps: ?
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: 1110 km [*E]

other data, primary:
diameter dp: 6.25 ± 0.28 km [M11b]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: ?
diameter ratio ds/dp: ?
component mag. difference ΔM: ?
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 [MPC30478].

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 by Wm. Robert Johnston.
Last modified 16 July 2017.
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