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Link to original content: http://www.johnstonsarchive.net/astro/astmoons/am-08373.html
(8373) Stephengould
Asteroids with Satellites Database--Johnston's Archive

(8373) Stephengould

compiled by Wm. Robert Johnston
last updated 3 May 2022

--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, Hungaria

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 3.280218619 AU
orbital period P: 5.941038768 yr
(= 2169.96441 d)
eccentricity e: 0.554698714
perihelion distance q: 1.460685569 AU
aphelion distance Q: 5.099751669 AU
inclination i: 40.79090505°
argument of perihelion ω: 55.46001307°
ascending node Ω: 88.88451426°
mean anomaly M: 258.456129°
perihelion passage TP: 2016 Jan 25.07385
Epoch: 2014 May 23
data arc: 1992-2010 (817 obs.)
Earth MOID: 0.644159 AU
Jupiter Tisserand invariant TJ: 2.587

orbital data, secondary:
semimajor axis as: 16 km [*E]
separation/primary radius as/rp:5.8 [*E]
separation/Hill radius as/rH:0.025 [*E]
orbital period Ps: 1.423 ± 0.004 d [K10b]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.9 [MPC]
14.2 ± 0.35 [K10b]
slope parameter G: (0.15) [*A]
effective diameter dE: 5.75 ± 1.35 km [N16c]
geometric albedo: 0.133 ± 0.088 [N16c]
color index U-B: ?
color index B-V: 0.76 [K10b]
color index V-R:0.435 ± 0.041 [K10b]
color index B-R:1.2 ± 0.043 [K10b]
color index V-I:0.86 [K10b]
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 630 km [*E]

other data, primary:
diameter dp: 5.55 ± 1.30 km [*D]
rotation period RPp: 4.435 h [K10b]
amplitude in mag., rotational ΔM: 0.36 ± 0.03 [K10b]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: >1.50 ± 0.35 km [*D]
diameter ratio ds/dp: >0.27 [K10b]
component mag. difference ΔM: <2.8 [*D]
rotation period RPs: ?

-- (8373) Stephengould --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 AB . Permanent number assigned 1998 Mar 13.

Named 1999 Nov 23 for Stephen Jay Gould (1941-2002) [MPC036946].

Companion discovered 2010 Jan 16 by Yu. N. Krugly, R. Behrend, P. Pravec, K. Hornoch, P. Kusnirak, A. Galad, P. Veres, R. Crippa, F. Manzini, M. Audejean, L. Bernasconi, N. Gaftonyuk, B. D. Warner, I. Molotov, and L. Elenin using lightcurve observations from Kharkiv National University, Ukraine; Geneva Observatory; Ondrejov Observatory, Czech Republic; Modra Observatory, Slovakia; Fondazione Observatorio Astronomico di Tradate, Tradate, Italy; Stazione Astronomica di Sozzago, Italy; Chinon, France; Les Engarouines, France; Simeiz Observatory; Palmer Divide Observatory, Colorado Springs, Colorado, USA; Keldysh Institute of Applied Mathematics, Moscow. Announced 2010 Mar 04 [K10b].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2010-2013, 2022 by Wm. Robert Johnston.
Last modified 3 May 2022.
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