Asteroids with Satellites Database--Johnston's Archive

(2070) Humason

compiled by Wm. Robert Johnston
last updated 3 February 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: main belt asteroid


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.2500773375 AU
orbital period P: 3.3751740109 yr
(= 1232.8055905 d)
eccentricity e: 0.1546556
perihelion distance q: 1.902090277 AU
aphelion distance Q: 2.5980643984 AU
inclination i: 2.752352°
argument of perihelion ω: 350.332271°
ascending node Ω: 1.235392°
mean anomaly M: 77.218011°
perihelion passage TP: 2018 Aug 05.570013
Epoch: 2019 Apr 27
data arc: 1954-2018 (1749 obs.)
Earth MOID: 0.895557 AU
Jupiter Tisserand invariant TJ: 3.61


orbital data, secondary:
semimajor axis as: 17 km [*E]
separation/primary radius as/rp:7.8 [*E]
separation/Hill radius as/rH:0.026 [*E]
orbital period Ps: 2.229 ± 0.004 d [B19b]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.4 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 4.57 ± 0.15 km [M**]
geometric albedo: 0.405 ± 0.087 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 650 km [*E]

other data, primary:
diameter dp: 4.37 km [*D]
rotation period RPp: 3.1883 ± 0.0005 h [B19b]
amplitude in mag., rotational ΔM: 0.15 [B19b]
amplitude in mag., mutual events ΔM:0.125 ±0.025 [B19b]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 1.35 km [*D]
diameter ratio ds/dp: 0.31 ± 0.02 [B19b]
component mag. difference ΔM: 2.5 ± 0.2 [*D]
rotation period RPs: ?

-- (2070) Humason --discovery and notes:

Primary discovered 1964 Oct 14 from Goethe Link Observatory, Brooklyn, Indiana, USA by Indiana Asteroid Program. Alternate designation(s): 1964 TQ, 1954 UJ1, 1964 XM, 1974 QP, 1974 RB2. Linked to prediscovery observations from 1954 Oct 23. Permanent number assigned -.

Named 1983 Dec 20 for Milton L. Humason (1891-1972) [MPC008403].

Companion discovered 2018 Oct 13 by V. Benishek, P. Pravec, F. Pilcher, V. Chiorny using lightcurve observations from Sopot Observatory, Serbia; Organ Mesa Observatory, New Mexico, USA; Kharkiv Observatory, Chuguev, Ukraine. Announced 2019 Jan 16 [B19b].

--Links, more technical:

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--Links to ADS abstracts:


© 2019 by Wm. Robert Johnston.
Last modified 3 February 2019.
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