Asteroids with Satellites Database--Johnston's Archive

(10044) Squyres

compiled by Wm. Robert Johnston
last updated 5 January 2023

--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: 2.5642002977 AU
orbital period P: 4.106162398 yr
(= 1499.775816 d)
eccentricity e: 0.334715374
perihelion distance q: 1.705923035 AU
aphelion distance Q: 3.422477561 AU
inclination i: 16.4444912°
argument of perihelion ω: 32.6231865°
ascending node Ω: 317.9671764°
mean anomaly M: 45.0169032°
perihelion passage TP: 2022 Aug 21.457603
Epoch: 2023 Feb 25
data arc: 1985-2022 (2091 obs.)
Earth MOID: 0.716893 AU
Jupiter Tisserand invariant TJ: 3.298

orbital data, secondary:
semimajor axis as: 8.3 km [*E]
separation/primary radius as/rp:3.7 [*E]
separation/Hill radius as/rH:0.014 [*E]
orbital period Ps: 0.7779 ± 0.0004 d [B23a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.57 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 4.61 ± 0.21 km [M**]
geometric albedo: 0.362 ± 0.062 [M**]
color index U-B: ?
color index B-V: ?
color index J-H:1.354 [LMP]
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 590 km [*E]

other data, primary:
diameter dp: 4.44 ± 0.20 km [*D]
rotation period RPp: 3.3356 ± 0.0005 h [B23a]
amplitude in mag., rotational ΔM: 0.1 [B23a]
amplitude in mag., mutual events ΔM:0.12 ±0.04 [B23a]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: >1.24 ± 0.057 km [*D]
diameter ratio ds/dp: >0.28 [B23a]
component mag. difference ΔM: <2.8 [*D]
rotation period RPs: ?

-- (10044) Squyres --discovery and notes:

Primary discovered 1985 Sep 15 from Palomar Observatory, California, USA by C. S. Shoemaker and E. M. Shoemaker. Alternate designation(s): 1985 RU, 1989 PD. Permanent number assigned 1999 Mar 02.

Named 2002 Sep 21 for Steven W. Squyres (1956-) [MPC046682].

Companion discovered 2022 Aug 12 by V. Benishek, P. Pravec, and R. Durkee using lightcurve observations from Sopot Observatory, Serbia; Shed of Science South Observatory, Pontotoc, Texas, USA. Announced 2023 Jan 04 [B23a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2023 by Wm. Robert Johnston.
Last modified 5 January 2023.
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