Asteroids with Satellites Database--Johnston's Archive

(37424) 2001 YA3

compiled by Wm. Robert Johnston
last updated 30 April 2022

--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: main belt asteroid


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.561222743 AU
orbital period P: 4.099012349 yr
(= 1497.1642603 d)
eccentricity e: 0.186362578
perihelion distance q: 2.083906669 AU
aphelion distance Q: 3.038538817 AU
inclination i: 12.69879171°
argument of perihelion ω: 62.5076229°
ascending node Ω: 339.0782184°
mean anomaly M: 4.7659059°
perihelion passage TP: 2022 Jan 01.179600
Epoch: 2022 Jan 21
data arc: 1980-2021 (1751 obs.)
Earth MOID: 1.12377 AU
Jupiter Tisserand invariant TJ: 3.376


orbital data, secondary:
semimajor axis as: 11 km [*E]
separation/primary radius as/rp:3.8 [*E]
separation/Hill radius as/rH:0.010 [*E]
orbital period Ps: 0.7898 ± 0.0003 d [B21l]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.34 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 5.93 ± 0.07 km [M11b]
geometric albedo: 0.349 ± 0.055 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1200 km [*E]

other data, primary:
diameter dp: 5.79 km [*D]
rotation period RPp: 2.8251 ± 0.0002 h [B21l]
amplitude in mag., rotational ΔM: 0.11 [B21l]
amplitude in mag., mutual events ΔM:0.05 [B21l]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: >1.27 km [*D]
diameter ratio ds/dp: >0.22 [B21l]
component mag. difference ΔM: <3.3 [*D]
rotation period RPs: ?

-- (37424) 2001 YA3 --discovery and notes:

Primary discovered 2001 Dec 19 from Fountain Hills, Arizona, USA by C. W. Juels. Alternate designation(s): 1980 RZ7, 1980 TR8, 1984 SJ2, 1999 JJ138. Linked to prediscovery observations from 1980 Sep 13. Permanent number assigned 2002 Feb 27.

Companion discovered 2021 Sep 26 by V. Benishek, P. Pravec, P. Sogorb, and R. Durkee using lightcurve observations from Sopot Observatory, Serbia; Bastidan Observatory, France; Shed of Science South Observatory, Pontotoc, Texas, USA. Announced 2021 Dec 09 [B21l].

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--Links to ADS abstracts:


© 2021, 2022 by Wm. Robert Johnston.
Last modified 30 April 2022.
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