Asteroids with Satellites Database--Johnston's Archive

(5817) Robertfrazer

compiled by Wm. Robert Johnston
last updated 14 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: Mars crossing asteroid


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.4080052349 AU
orbital period P: 3.7366820008 yr
(= 1364.8488776 d)
eccentricity e: 0.340451816
perihelion distance q: 1.58819548 AU
aphelion distance Q: 3.2278149902 AU
inclination i: 21.1071678°
argument of perihelion ω: 82.834324°
ascending node Ω: 340.465609°
mean anomaly M: 45.3274335°
perihelion passage TP: 2019 Dec 11.152509
Epoch: 2020 May 31
data arc: 1959-2020 (1801 obs.)
Earth MOID: 0.74502 AU
Jupiter Tisserand invariant TJ: 3.354


orbital data, secondary:
semimajor axis as: 16 km [*E]
separation/primary radius as/rp:4.9 [*E]
separation/Hill radius as/rH:0.020 [*E]
orbital period Ps: 1.2026 ± 0.0003 d [S20b]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 12.9 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 6.5 ± 1.4 km [M**]
geometric albedo: 0.297 ± 0.162 [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: 800 km [*E]

other data, primary:
diameter dp: 6.5 ± 1.4 km [M**]
rotation period RPp: 4.05083 ± 0.000005 h [S20b]
amplitude in mag., rotational ΔM: 0.32 [S20b]
amplitude in mag., mutual events ΔM:0.12 [S20b]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: ?
diameter ratio ds/dp: ?
component mag. difference ΔM: ?
rotation period RPs: ?

-- (5817) Robertfrazer --discovery and notes:

Primary discovered 1989 Sep 05 from Palomar Observatory, California, USA by E. F. Helin. Alternate designation(s): 1989 RZ, 1959 RH, 1959 RQ. Linked to prediscovery observations from 1959 Sep 01. Permanent number assigned 1994 Jan 27.

Named 2000 Jul 26 for Robert E. Frazer (1918-) [MPC041027].

Companion discovered 2020 Jan 10 by R. D. Stephens, B. D. Warner using lightcurve observations from Center for Solar System Studies, Landers, California, USA; Sugarloaf Mountain Observatory, Massachusetts, USA; Belgrade Astronomical Observatory, Belgrade, Serbia. Announced 2020 Jun [S20b].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2020 by Wm. Robert Johnston.
Last modified 14 June 2020.
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