Asteroids with Satellites Database--Johnston's Archive

(250162) 2002 TY57

compiled by Wm. Robert Johnston
last updated 30 December 2018

--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: 1.9216882455 AU
orbital period P: 2.663939764 yr
(= 973.0223755 d)
eccentricity e: 0.327393928
perihelion distance q: 1.29253918 AU
aphelion distance Q: 2.5508373077 AU
inclination i: 3.455483°
argument of perihelion ω: 259.9754°
ascending node Ω: 118.95667°
mean anomaly M: 76.208153°
perihelion passage TP: 2018 Oct 03.021560
Epoch: 2019 Apr 27
data arc: 2002-2018 (306 obs.)
Earth MOID: 0.301419 AU
Jupiter Tisserand invariant TJ: 3.854


orbital data, secondary:
semimajor axis as: 0.5 km [*E]
separation/primary radius as/rp:2.7 [*E]
separation/Hill radius as/rH:0.009 [*E]
orbital period Ps: 0.4485 ± 0.0002 d [P18d]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 19.3 [MPC]
19.69 ± 0.05 [P18d]
slope parameter G: 0.34 [P18d]
effective diameter dE: 0.38 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: 55 km [*E]

other data, primary:
diameter dp: 0.37 km [*E]
rotation period RPp: 2.5001 ± 0.0003 h [P18d]
amplitude in mag., rotational ΔM: 0.09 [P18d]
amplitude in mag., mutual events ΔM:0.05 ±0.02 [P18d]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: >0.07 km [*E]
diameter ratio ds/dp: >0.18 [P18d]
component mag. difference ΔM: <3.7 [*D]
rotation period RPs: ?

-- (250162) 2002 TY57 --discovery and notes:

Primary discovered 2002 Oct 02 from Haleakala, Hawaii, USA by NEAT. Linked to prediscovery observations from 2002 Aug 04. Permanent number assigned 2010 Sep 23.

Companion discovered 2018 Nov 10 by P. Pravec, P. Kusnirak, K. Hornoch, P. Fatka, and H. Kucakova using lightcurve observations from European Southern Observatory, La Silla. Announced 2018 Dec 18 [P18d].

--Links, more technical:

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--Links to ADS abstracts:


© 2018 by Wm. Robert Johnston.
Last modified 30 December 2018.
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