Asteroids with Satellites Database--Johnston's Archive

(100015) 1989 SR7

compiled by Wm. Robert Johnston
last updated 27 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: Mars crossing asteroid

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.3651666079 AU
orbital period P: 3.637412947 yr
(= 1328.590171 d)
eccentricity e: 0.299396469
perihelion distance q: 1.657044077 AU
aphelion distance Q: 3.073289139 AU
inclination i: 4.3888188°
argument of perihelion ω: 88.796176°
ascending node Ω: 269.306504°
mean anomaly M: 56.0211441°
perihelion passage TP: 2018 Oct 02.252385
Epoch: 2019 Apr 27
data arc: 1989-2018 (639 obs.)
Earth MOID: 0.659788 AU
Jupiter Tisserand invariant TJ: 3.483

orbital data, secondary:
semimajor axis as: 4.6 km [*E]
separation/primary radius as/rp:4 [*E]
separation/Hill radius as/rH:0.011 [*E]
orbital period Ps: 0.8604 ± 0.0004 d [B18g]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 15.7 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 2.39 km [*E]
geometric albedo: (0.16 ) [*A]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 430 km [*E]

other data, primary:
diameter dp: 2.3 km [*E]
rotation period RPp: 2.4172 ± 0.0002 h [B18g]
amplitude in mag., rotational ΔM: 0.05 [B18g]
amplitude in mag., mutual events ΔM:0.17 ±0.04 [B18g]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 0.8 km [*E]
diameter ratio ds/dp: 0.35 ± 0.02 [B18g]
component mag. difference ΔM: 2.28 ± 0.12 [*D]
rotation period RPs: ?

-- (100015) 1989 SR7 --discovery and notes:

Primary discovered 1989 Sep 28 from Palomar Observatory, California, USA by C. S. Shoemaker. Alternate designation(s): 2000 UC98. Linked to prediscovery observations from 1989 Sep 27. Permanent number assigned 2005 Oct 19.

Companion discovered 2018 Sep 09 by V. Benishek, P. Pravec, H. Kucakova, K. Hornoch, P. Kusnirak, J. Oey, R. Groom, A. Aznar, A. Sota using lightcurve observations from Sopot Observatory, Serbia; Ondrejov Observatory; Blue Mountains Observatory; Darling Range Observatory; Sierra Nevada Observatory. Announced 2018 Oct 23 [B18g].

--Links, more technical:

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--Links to ADS abstracts:

© 2018, 2019 by Wm. Robert Johnston.
Last modified 27 May 2019.
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