Asteroids with Satellites Database--Johnston's Archive

(12218) Fleischer

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: 2.2119777519 AU
orbital period P: 3.2898123891 yr
(= 1201.6266693 d)
eccentricity e: 0.141125088
perihelion distance q: 1.899812196 AU
aphelion distance Q: 2.5241433074 AU
inclination i: 4.8655729°
argument of perihelion ω: 290.587862°
ascending node Ω: 108.216593°
mean anomaly M: 128.487436°
perihelion passage TP: 2019 Mar 29.127971
Epoch: 2020 May 31
data arc: 1982-2020 (2284 obs.)
Earth MOID: 0.914182 AU
Jupiter Tisserand invariant TJ: 3.639


orbital data, secondary:
semimajor axis as: ?
orbital period Ps: ?
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.5 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 4.99 ± 0.06 km [M**]
geometric albedo: 0.31 ± 0.041 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 740 km [*E]

other data, primary:
diameter dp: 4.99 ± 0.06 km [M**]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


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

-- (12218) Fleischer --discovery and notes:

Primary discovered 1992 Sep 15 from Sugarloaf Mountain, Ondrejov, Sopot, Starry Night Observatory by ?. Alternate designation(s): 1982 RK, 1992 TK1. Linked to prediscovery observations from 1982 Sep 15. Permanent number assigned 1999 Nov 23.

Named 2004 May 04 for Randall Craig Fleischer (1959-) [MPC051979].

Companion discovered 2020 Mar 23 by P. Pray, P. Pravec, H. Kucakova, K. Hornoch, P. Kusnirak, V. Benishek, and W. Cooney using lightcurve observations. Announced 2020 Apr 02 [P20c].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


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