Asteroids with Satellites Database--Johnston's Archive

(5477) Holmes

compiled by Wm. Robert Johnston
last updated 29 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: main belt asteroid, Hungaria

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.917452812 AU
orbital period P: 2.655187713 yr
(= 969.8073123 d)
eccentricity e: 0.075236158
perihelion distance q: 1.773191031 AU
aphelion distance Q: 2.061714594 AU
inclination i: 22.54787325°
argument of perihelion ω: 290.3082655°
ascending node Ω: 49.13796957°
mean anomaly M: 135.4358434°
perihelion passage TP: 2013 May 23.1481
Epoch: 2014 May 23
data arc: 1989-2014 (940 obs.)
Earth MOID: 0.841282 AU
Jupiter Tisserand invariant TJ: 3.832

orbital data, secondary:
binary dynamical type:A [P07f]
semimajor axis as: 6.7 km [*E]
separation/primary radius as/rp:4.5 [*E]
separation/Hill radius as/rH:0.016 [*E]
orbital period Ps: 1.018 ± 0.0008 d [W05a]
eccentricity es: <0.05 [P16d]
normalized ang. mom. αL: 1.07 [P07f]

other data, system (combined):
absolute mag. H: 14 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 3.15 ± 0.14 km [M11b]
geometric albedo: 0.31 ± 0.038 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 410 km [*E]

other data, primary:
diameter dp: 2.95 ± 0.13 km [*D]
rotation period RPp: 2.9943 ± 0.0002 h [W05a]
amplitude in mag., rotational ΔM: 0.11 [W05a]
amplitude in mag., mutual events ΔM:0.18 ±0.04 [W05a]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 1.09 ± 0.08 km [*D]
diameter ratio ds/dp: 0.37 ± 0.02 [W05a]
component mag. difference ΔM: 2.16 ± 0.12 [*D]
rotation period RPs: ?

-- (5477) Holmes --discovery and notes:

Primary discovered 1989 Oct 27 from Palomar Observatory, California, USA by E. F. Helin. Alternate designation(s): 1989 UH2 . Permanent number assigned 1993 Mar 08.

Named 2011 Feb 18 for Robert E. Holmes Jr. (1956-) [MPC073983].

Companion discovered 2005 Nov 02 by B. D. Warner, P. Pravec, P. Kusnirak, W. Cooney, J. Gross, D. Terrell, D. Higgins, L. Kornos, J. Vilagi, D. Pray, G. Masi, and F. Mallia using lightcurve observations from Palmer Divide Observatory, Colorado Springs; Ondrejov Observatory, Czech Republic; Sonoita Research Observatory, Sonoita, Arizona, USA; Ngunnawal, Canberra, Australia; Modra Observatory, Slovakia; Greene, Rhode Island, USA; Universita degli Studi di Roma "Tor Vergata"; Campo Catino, Italy. Announced 2005 Nov 15 [W05a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2005-2014, 2019 by Wm. Robert Johnston.
Last modified 29 May 2019.
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