Asteroids with Satellites Database--Johnston's Archive
(4607)
Seilandfarm
compiled by Wm. Robert Johnston
last updated
21 September 2014
--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: |
2.263885788 AU
| |
orbital period P: |
3.406355510 yr
(= 1244.1713500 d)
| |
eccentricity e: |
0.019025892
| |
perihelion distance q: |
2.22081334 AU
| |
aphelion distance Q: |
2.306958234 AU
| |
inclination i: |
2.2519365°
| |
argument of perihelion ω: |
221.00120°
| |
ascending node Ω: |
250.57938°
| |
mean anomaly M: |
237.26237°
| |
perihelion passage TP: |
2015 Jul 21.1851
| |
Epoch: |
2014 May 23
| |
data arc: |
1987-2013
(1312 obs.)
| |
Earth MOID: |
1.23772 AU
| |
Jupiter Tisserand invariant TJ: |
3.616
|
orbital data, secondary:
|
binary dynamical type: | U [L14c] | |
semimajor axis as: |
19
km
[*E]
| |
separation/primary radius as/rp: | 5.4 [*E] | |
separation/Hill radius as/rH: | 0.015 [*E] | |
orbital period Ps: |
1.318
± 0.0008
d [P09b]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
13
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
7.39
± 0.12
km [M11b]
| |
geometric albedo: |
0.224
± 0.014
[M11b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
L (SMASSII) [JPL]
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
1200 km [*E]
|
other data, primary:
|
diameter dp: |
7.1
± 0.12
km [*D]
| |
rotation period RPp: |
3.9683
± 0.0001
h [P09b]
| |
amplitude in mag., rotational ΔM: |
0.15
[P09b]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
2.06
km [*D]
| |
diameter ratio ds/dp: |
>0.29
[P09b]
| |
component mag. difference ΔM: |
<2.7
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(4607) Seilandfarm
--discovery and notes:
Primary discovered
1987 Nov 25
from
Kitami, Hokkaido, Japan
by
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 discovered
2009 Jan 17
by D. Pray, P. Kusnirak, P. Pravec, J. Gross, W. Cooney, D. Terrell, and R. Durkee
using
lightcurve
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.
Announced
2009 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, 2014
by Wm. Robert Johnston.
Last modified
21 September 2014.
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