Asteroids with Satellites Database--Johnston's Archive

(3309) Brorfelde

compiled by Wm. Robert Johnston
last updated 21 September 2014

--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: 1.817472098 AU
orbital period P: 2.450246799 yr
(= 894.9526434 d)
eccentricity e: 0.053273893
perihelion distance q: 1.72064828 AU
aphelion distance Q: 1.914295912 AU
inclination i: 21.1338673°
argument of perihelion ω: 218.627257°
ascending node Ω: 29.807519°
mean anomaly M: 313.52236°
perihelion passage TP: 2014 Sep 15.5424
Epoch: 2014 May 23
data arc: 1982-2014 (909 obs.)
Earth MOID: 0.728988 AU
Jupiter Tisserand invariant TJ: 3.964


orbital data, secondary:
binary dynamical type:A [P07f]
semimajor axis as: 9 km [*E]
separation/primary radius as/rp:3.7 [*E]
separation/Hill radius as/rH:0.014 [*E]
orbital period Ps: 0.77 ± 0.0004 d [W05d]
eccentricity es: ?
normalized ang. mom. αL: 1.09 [P07f]

other data, system (combined):
absolute mag. H: 13.6 [MPC]
13.4 ± 0.2 [W05d]
slope parameter G: (0.15) [*A]
effective diameter dE: 5.04 ± 0.08 km [M12b]
geometric albedo: 0.253 ± 0.172 [M12b]
color index U-B: ?
color index B-V: ?
taxonomic type: S (SMASSII) [JPL]
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 660 km [*E]

other data, primary:
diameter dp: 4.88 ± 0.08 km [*D]
rotation period RPp: 2.5041 ± 0.0002 h [W05d]
amplitude in mag., rotational ΔM: 0.09 [W05d]
amplitude in mag., mutual events ΔM:0.11 ±0.04 [W05d]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 1.27 ± 0.1 km [*D]
diameter ratio ds/dp: 0.26 ± 0.02 [W05d]
component mag. difference ΔM: 2.9 ± 0.2 [*D]
rotation period RPs: 18.45 ± 0.01 h [W09d]

-- (3309) Brorfelde --discovery and notes:

Primary discovered 1982 Jan 28 from Brorfelde, Denmark by K. S. Jensen. Alternate designation(s): 1982 BH . Permanent number assigned 1985 Sep 29.

Named 1987 Sep 07 for the village of Brorfelde, Zealand, Denmark [MPC12210].

Companion discovered 2005 Oct 25 by B. D. Warner, P. Pravec, P. Kusnirak, W. Cooney, J. Gross, D. Terrell, and S. Nudds using lightcurve observations from Palmer Divide Observatory, Colorado Springs, Colorado, USA; Ondrejov Observatory, Czech Republic; Sonoita Research Observatory, Sonoita, Arizona, USA; University of Western Ontario, Ontario, Canada. Announced 2005 Nov 07 [W05d].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2005-2009, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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