Asteroids with Satellites Database--Johnston's Archive

(85275) 1994 LY

compiled by Wm. Robert Johnston
last updated 27 May 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: NEA, Amor


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.8901669005 AU
orbital period P: 2.598664602 yr
(= 949.1801723 d)
eccentricity e: 0.441921613
perihelion distance q: 1.054861294 AU
aphelion distance Q: 2.7254725069 AU
inclination i: 17.7184392°
argument of perihelion ω: 202.811558°
ascending node Ω: 141.1640441°
mean anomaly M: 321.4794939°
perihelion passage TP: 2020 Sep 09.5636129
Epoch: 2020 May 31
data arc: 1994-2020 (3266 obs.)
Earth MOID: 0.0645006 AU
Jupiter Tisserand invariant TJ: 3.783


orbital data, secondary:
semimajor axis as: 4.2 km [*E]
separation/primary radius as/rp:3.4 [*E]
separation/Hill radius as/rH:0.021 [*E]
orbital period Ps: 0.69265 ± 0.00003 d [W20c]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 16.1 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 2.51 ± 1.18 km [M**]
geometric albedo: 0.093 ± 0.136 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 200 km [*E]

other data, primary:
diameter dp: 2.44 km [*D]
rotation period RPp: 2.696 ± 0.00003 h [W20c]
amplitude in mag., rotational ΔM: 0.1 ± 0.01 [W20c]
amplitude in mag., mutual events ΔM:0.08 ±0.01 [W20c]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: >0.59 km [*D]
diameter ratio ds/dp: >0.24 ± 0.02 [W20c]
component mag. difference ΔM: <3.1 [*D]
rotation period RPs: ?

-- (85275) 1994 LY --discovery and notes:

Primary discovered 1994 Jun 11 from Palomar Observatory, California, USA by E. F. Helin. Linked to prediscovery observations from 1994 Jun 05. Permanent number assigned 2004 Aug 30.

Companion discovered 2020 Jul 01 by B. D. Warner, R. D. Stephens, and A. W. Harris using lightcurve observations from Center for Solar System Studies, Landers, California, USA. Announced 2020 Sep [W20c].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2020 by Wm. Robert Johnston.
Last modified 11 October 2020
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