(4607) Seilandfarm

compiled by Wm. Robert Johnston
last updated 6 June 2009

Orbital elements and other data (Assumed or derived values in parenthesis, my estimates in italics and parenthesis. Source identifications in brackets, see this link for sources):

orbital data, primary (osculating elements) [JPL]:
semimajor axis a: 2.2637786 AU
orbital period P: 3.406 y (=1244.08 d)
eccentricity e: 0.0202119
perihelion distance q: 2.2180233 AU
aphelion distance Q: 2.3095339 AU
inclination i: 2.24951°
argument of perihelion omega: 219.84948°
ascending node OMEGA: 250.69290°
mean anomaly M: 77.53849°
perihelion passage TP: 2008-09-23.04
Epoch: 18 JUN 2009
data arc: 1987-2008 (803 obs.)

orbital data, secondary:
semimajor axis a: (23 km?)
semimajor axis/primary radius a/Rp: (4.5?)
orbital period P: 31.63 ± 0.02 h [C1716]
eccentricity e: ?

other data, primary:
diameter: (10 km?)
absolute magnitude H: 12.5 [JPL]
rotation period: 3.9683 ± 0.0001 h [C1716]
amplitude delta M: 0.22 ± 0.03 [HHa]
0.15 [C1716]
color index U-B: ?
color index B-V: ?
color index V-R: ?
color index R-I: ?
slope parameter G: ?
geometric albedo: (0.16) assumed
mass: ?
density: ?
type: L (JPL)

other data, secondary:
diameter: (3 km?)
diameter ratio Ds/Dp: >0.29 [C1716]
component magnitude difference: (2.7)
rotation period: ?

--(4607) Seilandfarm--discovery and notes:

Primary discovered 25 November 1987 by K. Endate and K. Watanabe at Kitami, Japan, subsequently linked to prediscovery observations from 1951. Alternate designations 1987 WR, 1951 CK1, 1975 EO4.

Secondary identified by D. Pray, W. Brookfield, P. Kusnirak, P. Pravec, J. Gross, W. Cooney, D. Terrell, and R. Durkee from lightcurve observations from 17 January-25 February 2009 as part of the Ondrejov Photometric Survey for Asynchronous Binary Asteroids; announced 11 March 2009.

See more information and links at Asteroid/Comet Connection Catchall Catalog page

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2009 by Wm. Robert Johnston.
Last modified 6 June 2009.
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