Asteroids with Satellites Database--Johnston's Archive

(2131) Mayall

compiled by Wm. Robert Johnston
last updated 21 September 2014

--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, Hungaria


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.887274522 AU
orbital period P: 2.592751044 yr
(= 947.0023187 d)
eccentricity e: 0.111037884
perihelion distance q: 1.67771555 AU
aphelion distance Q: 2.096833491 AU
inclination i: 33.995975°
argument of perihelion ω: 38.364046°
ascending node Ω: 306.063088°
mean anomaly M: 342.050863°
perihelion passage TP: 2014 Jul 09.2163
Epoch: 2014 May 23
data arc: 1975-2013 (756 obs.)
Earth MOID: 0.693214 AU
Jupiter Tisserand invariant TJ: 3.75


orbital data, secondary:
binary dynamical type:A [L14c]
semimajor axis as: 18 km [*E]
separation/primary radius as/rp:4.3 [*E]
separation/Hill radius as/rH:0.017 [*E]
orbital period Ps: 0.9783 ± 0.0004 d [W10c]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 12.72 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 8.56 ± 0.07 km [M11b]
geometric albedo: 0.198 ± 0.034 [M11b]
color index U-B: 0.45 [JPL]
color index B-V: 0.871 [JPL]
taxonomic type: S (SMASSII) [JPL]
S (Tholen) [JPL]
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1100 km [*E]

other data, primary:
diameter dp: 8.28 ± 0.07 km [*D]
rotation period RPp: 2.568 ± 0.000 h [W10c]
amplitude in mag., rotational ΔM: 0.09 ± 0.02 [W07a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 2.15 km [*D]
diameter ratio ds/dp: >0.26 [W10c]
component mag. difference ΔM: <2.9 [*D]
rotation period RPs: ?

-- (2131) Mayall --discovery and notes:

Primary discovered 1975 Sep 03 from Lick Observatory, Mount Hamilton, California, USA by A. R. Klemola. Alternate designation(s): 1975 RA . Permanent number assigned 1979.

Named 1981 Mar 01 for Nicholas U. Mayall (1906-1993) [MPC5848].

Companion discovered 2009 Nov 30 using lightcurve observations. Announced 2009 Dec 31.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2010, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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