Asteroids with Satellites Database--Johnston's Archive

(1480) Aunus

compiled by Wm. Robert Johnston
last updated 7 June 2020

--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: 2.2021315394 AU
orbital period P: 3.2678708586 yr
(= 1193.6123739 d)
eccentricity e: 0.108894031
perihelion distance q: 1.96233256 AU
aphelion distance Q: 2.441930519 AU
inclination i: 4.8617546°
argument of perihelion ω: 64.75341°
ascending node Ω: 63.674332°
mean anomaly M: 85.230807°
perihelion passage TP: 2019 Aug 22.409596
Epoch: 2020 May 31
data arc: 1940-2020 (2372 obs.)
Earth MOID: 0.983252 AU
Jupiter Tisserand invariant TJ: 3.652


orbital data, secondary:
semimajor axis as: 12 km [*E]
separation/primary radius as/rp:3.9 [*E]
separation/Hill radius as/rH:0.013 [*E]
orbital period Ps: 0.8214 ± 0.0001 d [B20b]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.1 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 6.38 ± 0.07 km [M**]
geometric albedo: 0.257 ± 0.027 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: S (SMASSII) [JPL]
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 940 km [*E]

other data, primary:
diameter dp: 6.11 km [*D]
rotation period RPp: 5.16 ± 0.0002 h [B20b]
amplitude in mag., rotational ΔM: 0.16 [B20b]
amplitude in mag., mutual events ΔM:0.145 ±0.055 [B20b]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: >1.83 km [*D]
diameter ratio ds/dp: >0.3 [B20b]
component mag. difference ΔM: <2.6 [*D]
rotation period RPs: ?

-- (1480) Aunus --discovery and notes:

Primary discovered 1938 Feb 18 from Turku by Y. Vaisala. Alternate designation(s): 1938 DK, 1992 WX9. Permanent number assigned 1940 Jan 12.

Named 1956 Jan for Aunus Vaisala [MPC001350].

Companion discovered 2020 Mar 21 by V. Benishek, P. Pravec, J. Oey, R. Durkee, C. Odden, W. Cooney, J. Kemp, D. Pray, J. Gross, D. Terrell, A. Aznar using lightcurve observations from Sopot Observatory, Serbia; Blue Mountains Observatory, Leura, New South Wales, Australia; Shed of Science South Observatory, Pontotoc, Texas, USA; Phillips Academy Observatory, Andover, Massachusetts, USA; Starry Night Observatory, Columbus, Texas, USA; Mittelman Observatories at New Mexico Skies, New Mexico, USA; Sugarloaf Mountain Observatory, South Deerfield, Massachusetts, USA; Sonoita Research Observatory, Sonoita, Arizona, USA; Isaac Azner Observatory, Alcublas, Valencia, Spain. Announced 2020 Jun 02 [B20b].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2020 by Wm. Robert Johnston.
Last modified 7 June 2020.
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