Asteroids with Satellites Database--Johnston's Archive

(12218) Fleischer

compiled by Wm. Robert Johnston
last updated 30 April 2022

--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: 10 km [*E]
separation/primary radius as/rp:4.2 [*E]
separation/Hill radius as/rH:0.014 [*E]
orbital period Ps: 0.909 ± 0.0002 d [P20c]
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 ± 0.05 km [M11b]
geometric albedo: 0.310 ± 0.041 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 720 km [*E]

other data, primary:
diameter dp: 4.81 ± 0.05 km [*D]
rotation period RPp: 2.8289 h [W21b]
amplitude in mag., rotational ΔM: 0.13 [W21b]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: >1.35 km [*D]
diameter ratio ds/dp: >0.28 [W21b]
component mag. difference ΔM: 2.76 [*D]
rotation period RPs: ?

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

Primary discovered 1992 Sep 15 from Anderson Mesa Station, Flagstaff, Arizona, USA by E. Bowell. 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 from Sugarloaf Mountain Observatory, South Deerfield, Massachusetts, USA; Ondrejov Observatory, Czech Republic; Sopot Observatory, Serbia; Starry Night Observatory, Columbus, Texas, USA. Announced 2020 Apr 02 [P20c].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2020-2021, 2022 by Wm. Robert Johnston.
Last modified 30 April 2022.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.