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Asteroids with Satellites Database--Johnston's Archive

2005 GD187

compiled by Wm. Robert Johnston
last updated20 September 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:TNO, Cubewano


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

semimajor axisa:43.253 AU
orbital periodP:284.469 yr
(= 103902.4 d)
eccentricitye:0.01475
perihelion distanceq:42.615 AU
aphelion distanceQ:43.891 AU
inclinationi:0.69800°
argument of perihelionω:343.29°
ascending nodeΩ:354.536°
mean anomalyM:183.50°
perihelion passageTP:2153 Nov 12
Epoch:2014 May 23
data arc:2005-2013(17 obs.)
Earth MOID:41.6049 AU
Jupiter Tisserand invariantTJ:5.886
Neptune Tisserand invariantTN:3.09 [*D]

orbital data, secondary:

semimajor axisas:7600± 300 km (separation) [G12b]
separation/primary radiusas/rp:120 [*E]
separation/Hill radiusas/rH:0.019 [*E]
orbital periodPs:150d [*E]
eccentricityes:?
normalized ang. mom.αL:?
other data, system (combined):
absolute mag.H:7.2[MPC]
slope parameterG:(0.15) [*A]
effective diameterdE:160 km [*E]
geometric albedo:(0.09) [*A]
color indexU-B:?
color indexB-V:?
taxonomic type:?
massm:?
densityρ:(1 g/cm3) [*A]
Hill radiusrH:410000 km [*E]

other data, primary:

diameterdp:123 km [*E]
rotation periodRPp:?
amplitude in mag., rotationalΔM:?
pole directionΒ, λ:?,?

other data, secondary:

diameterds:102km [*E]
diameter ratiods/dp:0.832 [G12b]
component mag. differenceΔM:0.4 [G12b]
rotation periodRPs:?

-- 2005 GD187 --discovery and notes:

Primary discovered2005 Apr 12from Kitt Peak Observatory, Arizona, USAby M. W. Buie.

Companion discovered2009 Jan 21usingHubble Space Telescope observations from Hubble Space Telescope.Announced2011.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


©2011-2013, 2014by Wm. Robert Johnston.
Last modified20 September 2014.
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