Asteroids with Satellites Database--Johnston's Archive

(506121) 2016 BP81

compiled by Wm. Robert Johnston
last updated 17 August 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: TNO, Cubewano

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 43.6229 AU
orbital period P: 288.12 yr
(= 105237.3 d)
eccentricity e: 0.07834
perihelion distance q: 40.2057 AU
aphelion distance Q: 47.0401 AU
inclination i: 4.18622°
argument of perihelion ω: 271.976°
ascending node Ω: 28.992°
mean anomaly M: 72.82°
perihelion passage TP: 1961 Jan 13.8
Epoch: 2019 Apr 27
data arc: 2003-2016 (388 obs.)
Earth MOID: 39.1922 AU
Jupiter Tisserand invariant TJ: 5.877

orbital data, secondary:
semimajor axis as: 11300 ± 450 km (separation) [F17a]
separation/primary radius as/rp:120 [*E]
separation/Hill radius as/rH:0.017 [*E]
orbital period Ps: 140 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.2 [MPC]
6.5 ± 0.5 [G19c]
slope parameter G: (0.15) [*A]
effective diameter dE: 253 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: 650000 km [*E]

other data, primary:
diameter dp: 188 km [*E]
rotation period RPp: 6.85 h [P18f]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 169 km [*E]
diameter ratio ds/dp: 0.90 ± 0.04 [F17a]
component mag. difference ΔM: 0.23 [*D]
rotation period RPs: ?

-- (506121) 2016 BP81 --discovery and notes:

Primary discovered 2016 Jan 27 from Kepler by Kepler. Linked to prediscovery observations from 2003 Oct 23. Permanent number assigned 2017 Nov 04.

Companion discovered 0 by Fraser, W. C., et al. using adaptive optics telescope observations. Announced 2017 Apr 04 [F17a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2019 by Wm. Robert Johnston.
Last modified 17 August 2019.
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