Asteroids with Satellites Database--Johnston's Archive

(53110) 1999 AR7

compiled by Wm. Robert Johnston
last updated 18 March 2016

--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: 1.644494591 AU
orbital period P: yr
(= 770.2773027 d)
eccentricity e: 0.214430826
perihelion distance q: 1.291864257 AU
aphelion distance Q: 1.9971249248 AU
inclination i: 40.627067°
argument of perihelion ω: 58.22642°
ascending node Ω: 85.4560058°
mean anomaly M: 339.898887°
perihelion passage TP: 2016 Feb 25.009532
Epoch: 2016 Jan 13
data arc: 1998-2016 (648 obs.)
Earth MOID: 0.409728 AU
Jupiter Tisserand invariant TJ: 3.998

orbital data, secondary:
semimajor axis as: 3.8 km [*E]
separation/primary radius as/rp:5.4 [*E]
separation/Hill radius as/rH:0.026 [*E]
orbital period Ps: 1.305 ± 0.0008 d [W16a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 16.7 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 1.5 km [*E]
geometric albedo: (0.16 ) [*A]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 140 km [*E]

other data, primary:
diameter dp: 1.4 km [*E]
rotation period RPp: 2.7375 ± 0.0005 h [W16a]
amplitude in mag., rotational ΔM: 0.1 [W16a]
amplitude in mag., mutual events ΔM:0.185 ±0.015 [W16a]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: >0.6 km [*E]
diameter ratio ds/dp: >0.41 ± 0.02 [W16a]
component mag. difference ΔM: <1.9 [*D]
rotation period RPs: ?

-- (53110) 1999 AR7 --discovery and notes:

Primary discovered 1999 Jan 11 from Socorro, New Mexico, USA by LINEAR Program. Linked to prediscovery observations from 1998 Nov 28. Permanent number assigned 2003 Feb 16.

Companion discovered 2015 Dec 19 by B. D. Warner using lightcurve observations from Palmer Divide Observatory, Colorado Springs, Colorado, USA. Announced 2016 Mar [W16a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2016 by Wm. Robert Johnston.
Last modified 18 March 2016.
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