Asteroids with Satellites Database--Johnston's Archive
(7187)
Isobe
compiled by Wm. Robert Johnston
last updated
19 February 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, inner
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
1.937433295 AU
| |
orbital period P: |
2.696797524 yr
(= 985.0052955 d)
| |
eccentricity e: |
0.086375239
| |
perihelion distance q: |
1.770087031 AU
| |
aphelion distance Q: |
2.10477956 AU
| |
inclination i: |
21.78873043°
| |
argument of perihelion ω: |
86.20439375°
| |
ascending node Ω: |
315.3421135°
| |
mean anomaly M: |
173.6226989°
| |
perihelion passage TP: |
2013 Feb 01.9464
| |
Epoch: |
2014 May 23
| |
data arc: |
1985-2014
(685 obs.)
| |
Earth MOID: |
0.863359 AU
| |
Jupiter Tisserand invariant TJ: |
3.815
|
orbital data, secondary:
|
semimajor axis as: |
16
km
[*E]
| |
separation/primary radius as/rp: | 5.4 [*E] | |
separation/Hill radius as/rH: | 0.019 [*E] | |
orbital period Ps: |
1.38
d [W17a]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
13.9
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
6.05
± 1.46
km [M12b]
| |
geometric albedo: |
0.134
± 0.104
[M12b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
820 km [*E]
|
other data, primary:
|
diameter dp: |
5.96
km [*D]
| |
rotation period RPp: |
4.2427
± 0.0002
h [W13b]
| |
amplitude in mag., rotational ΔM: |
0.09
± 0.01
[W13b]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
1.01
km [*D]
| |
diameter ratio ds/dp: |
0.17
[W17a]
| |
component mag. difference ΔM: |
?
| |
rotation period RPs: |
?
| |
|
|
--
(7187) Isobe
--discovery and notes:
Primary discovered
1992 Jan 30
from
Palomar Observatory, California, USA
by
E. F. Helin.
Alternate designation(s):
1992 BW,
1985 QC3.
Linked to prediscovery observations from 1985 Aug 20.
Permanent number assigned 1996 Sep 27.
Named 2001 Nov 01 for Syuzo Isobe (1942-) [MPC43762].
Companion discovered
2012 Aug 26
by B. D. Warner
using
lightcurve
observations from Palmer Divide Observatory, Colorado Springs, Colorado, USA.
Announced
2013 Jan [W13b].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Warner, Brian D. 2013, Minor Planet Bulletin Rounding Up the Unusual Suspects
- Warner, Brian D. 2011, Minor Planet Bulletin Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2010 December- 2011 March
- Warner, Brian D. 2008, Minor Planet Bulletin Asteroid Lightcurve Analysis at the Palmer Divide Observatory: September-December 2007
- Warner, Brian D. 2005, Minor Planet Bulletin Lightcurve analysis for asteroids 242, 893, 921, 1373, 1853, 2120, 2448 3022, 6490, 6517, 7187, 7757, and 18108
©
2013-2014, 2017
by Wm. Robert Johnston.
Last modified
19 February 2017.
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