Asteroids with Satellites Database--Johnston's Archive

(9332) 1990 SB1

compiled by Wm. Robert Johnston
last updated 20 October 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: main belt asteroid


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.579766173 AU
orbital period P: 4.1435302684 yr
(= 1513.453014 d)
eccentricity e: 0.109236047
perihelion distance q: 2.29796272 AU
aphelion distance Q: 2.861569631 AU
inclination i: 12.6585623°
argument of perihelion ω: 211.872094°
ascending node Ω: 346.399699°
mean anomaly M: 132.70205°
perihelion passage TP: 2017 Oct 16.11579
Epoch: 2019 Apr 27
data arc: 1951-2019 (1687 obs.)
Earth MOID: 1.30791 AU
Jupiter Tisserand invariant TJ: 3.383


orbital data, secondary:
semimajor axis as: 21 km [*E]
separation/primary radius as/rp:7.0 [*E]
separation/Hill radius as/rH:0.020 [*E]
orbital period Ps: 2.035 ± 0.0012 d [P19c]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.1 [MPC]
13.32 ± 0.03 [P19c]
slope parameter G: 0.28 [P19c]
effective diameter dE: 6.18 ± 0.3 km [M**]
geometric albedo: 0.32 ± 0.065 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1100 km [*E]

other data, primary:
diameter dp: 5.98 ± 0.29 km [*D]
rotation period RPp: 2.98701 ± 0.00008 h [P19c]
amplitude in mag., rotational ΔM: 0.39 [P19c]
amplitude in mag., mutual events ΔM:0.07 [P19c]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 1.55 ± 0.14 km [*D]
diameter ratio ds/dp: 0.26 ± 0.02 [P19c]
component mag. difference ΔM: 2.9 ± 0.2 [*D]
rotation period RPs: ?

-- (9332) 1990 SB1 --discovery and notes:

Primary discovered 1990 Sep 16 from Palomar Observatory, California, USA by H. E. Holt. Alternate designation(s): 1951 EZ2, 1994 TU15. Linked to prediscovery observations from 1951 Mar 05. Permanent number assigned 1998 Oct 05.

Companion discovered 2019 Sep 21 by P. Pravec, P. Kusnirak, K. Hornoch, H. Kucakova, P. Fatka using lightcurve observations from La Silla Obsevatory; Ondrejov Observatory. Announced 2019 Oct 16 [P19c].

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© 2019 by Wm. Robert Johnston.
Last modified 20 October 2019.
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