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Asteroids with Satellites Database--Johnston's Archive

(8373) Stephengould

compiled by Wm. Robert Johnston
last updated3 May 2022

--Orbital and physical data--

(Seethis page for definitions of quantities; source codes in brackets, seethis 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 axisa:3.280218619 AU
orbital periodP:5.941038768 yr
(= 2169.96441 d)
eccentricitye:0.554698714
perihelion distanceq:1.460685569 AU
aphelion distanceQ:5.099751669 AU
inclinationi:40.79090505°
argument of perihelionω:55.46001307°
ascending nodeΩ:88.88451426°
mean anomalyM:258.456129°
perihelion passageTP:2016 Jan 25.07385
Epoch:2014 May 23
data arc:1992-2010(817 obs.)
Earth MOID:0.644159 AU
Jupiter Tisserand invariantTJ:2.587

orbital data, secondary:

semimajor axisas:16 km[*E]
separation/primary radiusas/rp:5.8 [*E]
separation/Hill radiusas/rH:0.025 [*E]
orbital periodPs:1.423± 0.004d [K10b]
eccentricityes:?
normalized ang. mom.αL:?
other data, system (combined):
absolute mag.H:13.9[MPC]
14.2 ± 0.35 [K10b]
slope parameterG:(0.15) [*A]
effective diameterdE:5.75± 1.35 km [N16c]
geometric albedo:0.133± 0.088[N16c]
color indexU-B:?
color indexB-V:0.76[K10b]
color indexV-R:0.435 ± 0.041 [K10b]
color indexB-R:1.2 ± 0.043 [K10b]
color indexV-I:0.86 [K10b]
taxonomic type:?
massm:?
densityρ:(1.6 g/cm3) [*A]
Hill radiusrH:630 km [*E]

other data, primary:

diameterdp:5.55± 1.30 km [*D]
rotation periodRPp:4.435h [K10b]
amplitude in mag., rotationalΔM:0.36± 0.03 [K10b]
pole directionΒ, λ:?,?

other data, secondary:

diameterds:>1.50± 0.35km [*D]
diameter ratiods/dp:>0.27 [K10b]
component mag. differenceΔM:<2.8 [*D]
rotation periodRPs:?

--(8373) Stephengould --discovery and notes:

Primary discovered1992 Jan 01from Palomar Observatory, California, USAby 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 discovered2010 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. Eleninusinglightcurve 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.Announced2010 Mar 04 [K10b].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

©2010-2013, 2022by Wm. Robert Johnston.
Last modified3 May 2022.
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