Asteroids with Satellites Database--Johnston's Archive

(285571) 2000 PQ9

compiled by Wm. Robert Johnston
last updated 9 October 2021

--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, Amor


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.9039009231 AU
orbital period P: 2.6270389785 yr
(= 959.5441091 d)
eccentricity e: 0.431968771
perihelion distance q: 1.081475182 AU
aphelion distance Q: 2.7263266641 AU
inclination i: 13.4765408°
argument of perihelion ω: 6.935496°
ascending node Ω: 297.2124165°
mean anomaly M: 350.321809°
perihelion passage TP: 2021 Jul 26.796253
Epoch: 2021 Jul 01
data arc: 2000-2021 (4421 obs.)
Earth MOID: 0.067072 AU
Jupiter Tisserand invariant TJ: 3.794


orbital data, secondary:
semimajor axis as: ?
orbital period Ps: ?
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 17.6 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 1.4 ± 0.78/0.38 km [N21c]
geometric albedo: 0.041 ± 0.038/0.024 [N21c]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 118 km [*E]

other data, primary:
diameter dp: 1.4 ± 0.78/0.38 km [N21c]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: ?
diameter ratio ds/dp: ?
component mag. difference ΔM: ?
rotation period RPs: ?

-- (285571) 2000 PQ9 --discovery and notes:

Primary discovered 2000 Aug 09 from Socorro, New Mexico, USA by LINEAR Program. Permanent number assigned 2011 Sep 12.

Companion discovered 2021 Jul using radar observations from Goldstone Observatory, California, USA. Announced 2021 Aug [B21g].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2021, 2021 by Wm. Robert Johnston.
Last modified 9 October 2021.
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