Asteroids with Satellites Database--Johnston's Archive
(7088)
Ishtar
compiled by Wm. Robert Johnston
last updated
29 May 2019
--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:
NEA, Amor
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
1.980767174 AU
| |
orbital period P: |
2.787779032 yr
(= 1018.236291 d)
| |
eccentricity e: |
0.390732639
| |
perihelion distance q: |
1.206816789 AU
| |
aphelion distance Q: |
2.754717558 AU
| |
inclination i: |
8.300909408°
| |
argument of perihelion ω: |
354.7089702°
| |
ascending node Ω: |
102.6867122°
| |
mean anomaly M: |
8.471812814°
| |
perihelion passage TP: |
2014 Apr 29.03803
| |
Epoch: |
2014 May 23
| |
data arc: |
1981-2013
(423 obs.)
| |
Earth MOID: |
0.223538 AU
| |
Jupiter Tisserand invariant TJ: |
3.751
|
orbital data, secondary:
|
binary dynamical type: | A [P07f] | |
semimajor axis as: |
2.5
km
[*E]
| |
separation/primary radius as/rp: | 4.0 [*E] | |
separation/Hill radius as/rH: | 0.021 [*E] | |
orbital period Ps: |
0.8604
± 0.0008
d [R06c]
| |
eccentricity es: |
<0.16
[P16d]
| |
normalized ang. mom. αL: |
1.21
[P07f]
|
|
other data, system (combined):
|
absolute mag. H: |
16.7
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
1.3
± 0.26
km [M17o]
| |
geometric albedo: |
0.26
± 0.102
[M17o]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
120 km [*E]
|
other data, primary:
|
diameter dp: |
1.26
± 0.25
km [*D]
| |
rotation period RPp: |
2.679
± 0
h [R06c]
| |
amplitude in mag., rotational ΔM: |
0.11
[P09d]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
0.33
± 0.15
km [*D]
| |
diameter ratio ds/dp: |
0.26
± 0.102
[R06c]
| |
component mag. difference ΔM: |
2.9
± 0.9
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(7088) Ishtar
--discovery and notes:
Primary discovered
1992 Jan 01
from
Palomar Observatory, California, USA
by
C. S. Shoemaker and E. M. Shoemaker.
Alternate designation(s):
1992 AA
.
Linked to prediscovery observations from 1981 Mar 03.
Permanent number assigned 1996 Jul 30.
Named 1997 Apr 22 for the mythological Mesopotamian goddess [MPC029671].
Companion discovered
2005 Dec 04
by V. Reddy, R. Dyvig, P. Pravec, P. Kusnirak, S. Gajdos, A. Galad, and L. Kornos
using
lightcurve
observations from University of North Dakota, Grand Forks, North Dakota, USA; Ondrejov Observatory, Czech Republic; Modra Observatory, Slovakia.
Announced
2006 Jan 31 [R06c].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Pravec, Petr & Scheirich, P. 2010, Bulletin of the American Astronomical Society Binary System Candidates for Detection of BYORP
- Reddy, V., Dyvig, R. R., Pravec, P., Kušnirák, P., Gajdoš, Š., Galád, A., Kornoš, L., & Ries, J. G. 2007, Lunar and Planetary Science Conference Photometric Observations of Binary Near-Earth Asteroid (7088) Ishtar and (11405) 1999 CV3
- Reddy, V., Dyvig, R., Pravec, P., Kusnirak, P., Gajdos, S., Galad, A., & Kornos, L. 2006, Central Bureau Electronic Telegrams (7088) Ishtar
©
2006-2014, 2019
by Wm. Robert Johnston.
Last modified
29 May 2019.
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