Asteroids with Satellites Database--Johnston's Archive

(4494) Marimo

compiled by Wm. Robert Johnston
last updated 22 May 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: 2.343083263 AU
orbital period P: 3.586656495 yr
(= 1310.0262848 d)
eccentricity e: 0.120242046
perihelion distance q: 2.061346138 AU
aphelion distance Q: 2.6248203876 AU
inclination i: 2.47179601°
argument of perihelion ω: 216.788863°
ascending node Ω: 294.315503°
mean anomaly M: 338.0146206°
perihelion passage TP: 2022 Apr 11.003958
Epoch: 2022 Jan 21
data arc: 1972-2022 (3240 obs.)
Earth MOID: 1.07303 AU
Jupiter Tisserand invariant TJ: 3.552

orbital data, secondary:
semimajor axis as: 13 km [*E]
separation/primary radius as/rp:4.6 [*E]
separation/Hill radius as/rH:0.014 [*E]
orbital period Ps: 1.0304 ± 0.0008 d [B22f]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.67 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 6.1 km [*E]
geometric albedo: (0.16 ) [*A]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 930 km [*E]

other data, primary:
diameter dp: 5.7 km [*E]
rotation period RPp: 4.1209 ± 0.0002 h [B22f]
amplitude in mag., rotational ΔM: 0.12 [B22f]
amplitude in mag., mutual events ΔM:0.15 [B22f]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: >2.2 km [*E]
diameter ratio ds/dp: >0.38 [B22f]
component mag. difference ΔM: <2.1 [*D]
rotation period RPs: ?

-- (4494) Marimo --discovery and notes:

Primary discovered 1988 Oct 13 from Kushiro, Hokkaido, Japan by S. Ueda and H. Kaneda. Alternate designation(s): 1988 TK1, 1972 GR, 1977 RN2, 1981 UK14, 1981 WG5, 1985 YJ. Linked to prediscovery observations from 1972 Apr 09. Permanent number assigned 1990 Jul 08.

Named 1992 Jul 14 [MPC020521].

Companion discovered 2022 Jan 14 by V. Benishek, P. Pravec, H. Kucakova, K. Hornoch, P. Kusnirak, A. Aznar, A. Leroy, and R. Durkee using lightcurve observations from Sopot Observatory, Serbia; Ondrejov Observatory, Czech Republic; Isaac Aznar Observatory, Alcublas, Valencia, Spain; Pic du Midi Observatory; Shed of Science South Observatory, Pontotoc, Texas, USA. Announced 2022 May 19 [B22f].

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--Links to ADS abstracts:

© 2022 by Wm. Robert Johnston.
Last modified 22 May 2022.
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