Asteroids with Satellites Database--Johnston's Archive

2020 BX12

compiled by Wm. Robert Johnston
last updated 7 February 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: NEA, Apollo (PHA)

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.5997 AU
orbital period P: 2.0233 yr
(= 739 d)
eccentricity e: 0.52686
perihelion distance q: 0.756893 AU
aphelion distance Q: 2.4426 AU
inclination i: 40.078°
argument of perihelion ω: 70.52°
ascending node Ω: 132.9045°
mean anomaly M: 336.002°
perihelion passage TP: 2020 Mar 21.27
Epoch: 2020 Feb 01
data arc: 2020 Jan-2020 Feb (126 obs.)
Earth MOID: 0.00201896 AU
Jupiter Tisserand invariant TJ: 3.974

orbital data, secondary:
semimajor axis as: >0.36 km [V20a]
separation/primary radius as/rp:4.4 [*E]
separation/Hill radius as/rH:0.036 [*E]
orbital period Ps: 1.96 ± 0.08 d [V20a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 0 [MPC]
20.59 ± 0.3 [JPL]
slope parameter G: (0.15) [*A]
effective diameter dE: 0.18 km [V20a]
geometric albedo: 0.3 [V20a]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 10 km [*E]

other data, primary:
diameter dp: >0.165 km [V20a]
rotation period RPp: <2.8 h [V20a]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: >0.07 km [V20a]
diameter ratio ds/dp: 0.42 [*D]
component mag. difference ΔM: 1.9 [*D]
rotation period RPs: <49 h [V20a]

-- 2020 BX12 --discovery and notes:

Primary discovered 2020 Jan 27 from Mauna Kea, Hawaii, USA by ATLAS-MLO.

Companion discovered 2020 Feb 04 by A. K. Virkki, L. F. Zambrano-Marin, S. E. Marshall, D. C. Hickson, and P. A. Taylor using radar observations from Arecibo Observatory, Puerto Rico. Announced 2020 Feb 07 [V20a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2020 by Wm. Robert Johnston.
Last modified 7 February 2020.
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