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Asteroids with Satellites Database--Johnston's Archive
(7344) Summerfield
compiled by Wm. Robert Johnston
last updated27 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: | 2.586592478 AU | | orbital periodP: | 4.159987402 yr
(= 1519.464096 d) | | eccentricitye: | 0.113456739 | | perihelion distanceq: | 2.29312613 AU | | aphelion distanceQ: | 2.880058826 AU | | inclinationi: | 14.3197896° | | argument of perihelionω: | 17.454071° | | ascending nodeΩ: | 175.030812° | | mean anomalyM: | 64.235206° | | perihelion passageTP: | 2016 Dec 06.880307 | | Epoch: | 2017 Sep 04 | | data arc: | 1985-2017(1259 obs.) | | Earth MOID: | 1.29951 AU | | Jupiter Tisserand invariantTJ: | 3.369 |
orbital data, secondary: | semimajor axisas: | 11 km[*E] | | orbital periodPs: | 0.7254± 0.0004d [P17i] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 13[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 6.25± 0.28 km [M11b] | | geometric albedo: | 0.343± 0.068[M11b] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 1100 km [*E] |
other data, primary: | diameterdp: | 6.15± 0.28 km [*D] | | rotation periodRPp: | 2.59± 0h [P17i] | | amplitude in mag., rotationalΔM: | ? | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 1.11± 0.19km [*D] | | diameter ratiods/dp: | 0.18± 0.03 [P17i] | | component mag. differenceΔM: | 3.72± 0.37 [*D] | | rotation periodRPs: | ? | |
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--(7344) Summerfield --discovery and notes:
Primary discovered1992 Jun 04from Palomar Observatory, California, USAby 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 discovered2017 by D. Pray, P. Pravec, H. Kucakova, K. Hornoch, P. Kusnirak, V. Chiorny, N. Gaftonyuk, V. Benishekusinglightcurve observations.Announced2017 Jul 05 [P17#].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©2017, 2019by Wm. Robert Johnston.
Last modified27 May 2019.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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