Asteroids with Satellites Database--Johnston's Archive

(15094) Polymele

compiled by Wm. Robert Johnston
last updated 19 February 2023

--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: Jupiter trojan asteroid, L4

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 5.18030111 AU
orbital period P: 11.79073038 yr
(= 4306.56427 d)
eccentricity e: 0.096759738
perihelion distance q: 4.67905653 AU
aphelion distance Q: 5.68154569 AU
inclination i: 12.9813206°
argument of perihelion ω: 4.77153°
ascending node Ω: 50.31861°
mean anomaly M: 44.313672°
perihelion passage TP: 2021 Sep 12.88979
Epoch: 2023 Feb 25
data arc: 1991-2019 (831 obs.)
Earth MOID: 3.68929 AU
Jupiter Tisserand invariant TJ: 2.94

orbital data, secondary:
semimajor axis as: 204 km [B22p]
separation/primary radius as/rp:22.3 [*D]
separation/Hill radius as/rH:0.030 [*D]
orbital period Ps: 11 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 11.81 [MPC]
slope parameter G: 0.22 [JPL]
effective diameter dE: 21.08 ± 0.14 km [M**]
geometric albedo: 0.091 ± 0.017 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 6700 km [*E]

other data, primary:
diameter dp: 18.3 km [*D]
dimensions :26.2 x 12.8km []
rotation period RPp: 5.8607 ± 0.0005 h [JPL]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 5.5 km [*D]
diameter ratio ds/dp: 0.3 [*D]
component mag. difference ΔM: 2.6 [*D]
rotation period RPs: ?

-- (15094) Polymele --discovery and notes:

Primary discovered 1999 Nov 17 from Catalina Station, Arizona, USA by Catalina Sky Survey. Alternate designation(s): 1999 WB2, 1997 WR57. Linked to prediscovery observations from 1991 May 04. Permanent number assigned 2000 May 23.

Named 2016 Feb 22 for the wife of Menoetius [MPC098711].

Companion discovered 2022 Mar 27 by M. Buie, B. Keeney, H. Levison, C. Olkin, and the Lucy Occultations Team using stellar occultation observations. Announced 2022 Aug 16 [K22a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2023 by Wm. Robert Johnston.
Last modified 19 February 2023.
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