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Asteroids with Satellites Database--Johnston's Archive

(5261) Eureka

compiled by Wm. Robert Johnston
last updated16 November 2014

--Orbital and physical data--

(Seethis page for definitions of quantities; source codes in brackets, seethis link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)

dynamical type, primary:Mars trojan asteroid, L5


orbital data, primary (osculating elements)[JPL]:

semimajor axisa:1.52353322 AU
orbital periodP:1.880519722 yr
(= 686.8728008 d)
eccentricitye:0.064859679
perihelion distanceq:1.424717344 AU
aphelion distanceQ:1.6223490956 AU
inclinationi:20.2803507°
argument of perihelionω:95.470352°
ascending nodeΩ:245.062272°
mean anomalyM:295.624269°
perihelion passageTP:2015 Apr 10.82761
Epoch:2014 Dec 09
data arc:1979-2014(757 obs.)
Earth MOID:0.499711 AU
Jupiter Tisserand invariantTJ:4.428

orbital data, secondary:

semimajor axisas:2.1 km[*E]
separation/primary radiusas/rp:3.5 [*E]
separation/Hill radiusas/rH:0.016 [*E]
orbital periodPs:0.7054± 0.0004d [K14a]
eccentricityes:?
normalized ang. mom.αL:?
other data, system (combined):
absolute mag.H:16.1[MPC]
slope parameterG:(0.15) [*A]
effective diameterdE:1.28± 0.07 km [T07a]
geometric albedo:0.39± 0.155[T07a]
color indexU-B:?
color indexB-V:?
taxonomic type:Sr (SMASSII) [JPL]
massm:?
densityρ:(1.6 g/cm3) [*A]
Hill radiusrH:130 km [*E]

other data, primary:

diameterdp:1.19 km [*D]
rotation periodRPp:2.6902± 0.0003h [K14a]
amplitude in mag., rotationalΔM:0.064 [K14a]
amplitude in mag., mutual eventsΔM:0.175 ±0.025 [K14a]
pole directionΒ, λ:?,?

other data, secondary:

diameterds:0.46km [*D]
diameter ratiods/dp:>0.39± 0.02 [K14a]
component mag. differenceΔM:2.0 [*D]
rotation periodRPs:?

--(5261) Eureka --discovery and notes:

Primary discovered1990 Jun 20from Palomar Observatory, California, USAby Holt and Levy.Alternate designation(s):1990 MB.Linked to prediscovery observations from 1979 Nov 21.Permanent number assigned 1992.

Companion discovered2011 Nov 28usinglightcurve observations.Announced2014 Sep [K14a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


©2014by Wm. Robert Johnston.
Last modified16 November 2014.
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