Asteroids with Satellites Database--Johnston's Archive

2005 BW49

compiled by Wm. Robert Johnston
last updated 22 March 2020

--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: TNO, Cubewano

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 43.864 AU
orbital period P: 290.52 yr
(= 106112 d)
eccentricity e: 0.0756
perihelion distance q: 40.548 AU
aphelion distance Q: 47.181 AU
inclination i: 2.10308°
argument of perihelion ω: 124.92°
ascending node Ω: 58.953°
mean anomaly M: 326.55°
perihelion passage TP: 2047 May 31
Epoch: 2020 May 31
data arc: 2004-2013 (22 obs.)
Earth MOID: 39.5509 AU
Jupiter Tisserand invariant TJ: 5.905
Neptune Tisserand invariant TN:3.093 [*D]

orbital data, secondary:
semimajor axis as: 2956 ± 51 km (separation) [G20a]
separation/primary radius as/rp:45 [*E]
separation/Hill radius as/rH:0.0075 [*E]
orbital period Ps: 36 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.6 [MPC]
7.2 ± 0.5 [G20a]
slope parameter G: (0.15) [*A]
effective diameter dE: 161 km [*E]
geometric albedo: (0.09 ) [*A]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1 g/cm3) [*A]
Hill radius rH: 390000 km [*E]

other data, primary:
diameter dp: 131 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 94 km [*E]
diameter ratio ds/dp: 0.71
component mag. difference ΔM: 0.73 [G20a]
rotation period RPs: ?

-- 2005 BW49 --discovery and notes:

Primary discovered 2005 Jan 16 from Mauna Kea, Hawaii, USA by B. Gladman. Linked to prediscovery observations from 2004 Mar 18.

Companion discovered 2020 Feb 12 by Solar System Origins Legacy Survey (A. H. Parker et al.) using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2020 Feb 23 [G20a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2020 by Wm. Robert Johnston.
Last modified 22 March 2020.
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