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Asteroids with Satellites Database--Johnston's Archive
(4607) Seilandfarm
compiled by Wm. Robert Johnston
last updated21 September 2014--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: | 2.263885788 AU | | orbital periodP: | 3.406355510 yr
(= 1244.1713500 d) | | eccentricitye: | 0.019025892 | | perihelion distanceq: | 2.22081334 AU | | aphelion distanceQ: | 2.306958234 AU | | inclinationi: | 2.2519365° | | argument of perihelionω: | 221.00120° | | ascending nodeΩ: | 250.57938° | | mean anomalyM: | 237.26237° | | perihelion passageTP: | 2015 Jul 21.1851 | | Epoch: | 2014 May 23 | | data arc: | 1987-2013(1312 obs.) | | Earth MOID: | 1.23772 AU | | Jupiter Tisserand invariantTJ: | 3.616 |
orbital data, secondary: | binary dynamical type: | U [L14c] | | semimajor axisas: | 19 km[*E] | | separation/primary radiusas/rp: | 5.4 [*E] | | separation/Hill radiusas/rH: | 0.015 [*E] | | orbital periodPs: | 1.318± 0.0008d [P09b] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 13[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 7.39± 0.12 km [M11b] | | geometric albedo: | 0.224± 0.014[M11b] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | L (SMASSII) [JPL] | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 1200 km [*E] |
other data, primary: | diameterdp: | 7.1± 0.12 km [*D] | | rotation periodRPp: | 3.9683± 0.0001h [P09b] | | amplitude in mag., rotationalΔM: | 0.15 [P09b] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 2.06km [*D] | | diameter ratiods/dp: | >0.29 [P09b] | | component mag. differenceΔM: | <2.7 [*D] | | rotation periodRPs: | ? | |
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--(4607) Seilandfarm --discovery and notes:
Primary discovered1987 Nov 25from Kitami, Hokkaido, Japanby K. Endate and K. Watanabe.Alternate designation(s):1987 WR, 1951 CK1, 1975 EO4.Permanent number assigned 1990 Oct 04.
Named 1992 Jul 14 for a farm near Kitami, Okhotsk, Hokkaido, Japan [MPC20521].
Companion discovered2009 Jan 17 by D. Pray, P. Kusnirak, P. Pravec, J. Gross, W. Cooney, D. Terrell, and R. Durkeeusinglightcurve observations from Carbuncle Observatory, W. Brookfield, Massachusetts, USA; Ondrejov Observatory, Czech Republic; Sonoita Research Observatory, Sonoita, Arizona, USA; Shed of Science Observatory, Minneapolis, Minnesota, USA.Announced2009 Mar 11 [P09b].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Pray, D., Brookfield, W., Kusnirak, P., Pravec, P., Gross, J., Cooney, W., Terrell, D., & Durkee, R. 2009, Central Bureau Electronic Telegrams(4607) Seilandfarm
©2009, 2014by Wm. Robert Johnston.
Last modified21 September 2014.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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