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Asteroids with Satellites Database--Johnston's Archive

2003 QY90

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:42.6265 AU
orbital periodP:278.309 yr
(= 101652.3 d)
eccentricitye:0.05534
perihelion distanceq:40.267 AU
aphelion distanceQ:44.9855 AU
inclinationi:3.77074°
argument of perihelionω:39.56°
ascending nodeΩ:104.232°
mean anomalyM:194.55°
perihelion passageTP:2142 Apr 20
Epoch:2014 May 23
data arc:2000-2008(44 obs.)
Earth MOID:39.281 AU
Jupiter Tisserand invariantTJ:5.825
Neptune Tisserand invariantTN:3.08 [*D]

orbital data, secondary:

semimajor axisas:8549± 95 km[G11a]
separation/primary radiusas/rp:210 [*D]
separation/Hill radiusas/rH:0.032 [*D]
orbital periodPs:309.7± 0.18d [G11a]
eccentricityes:0.662± 0.009[G11a]
inclinationis:41.79° ± 0.59° [G11a]
ascending nodeΩs:113.57° ± 0.39° [G11a]
argument of pericenterωs:286.7° ± 1.3° [G11a]
mean anomalyM:313.2° ± 1.4° [G11a]
Epoch:2005 May 09.5
normalized ang. mom.αL:?
other data, system (combined):
absolute mag.H:6.4[MPC]
slope parameterG:(0.15) [*A]
effective diameterdE:114 km [*D]
geometric albedo:0.31± 0.13/0.13[G11a]
color indexU-B:?
color indexB-V:?
taxonomic type:?
massm:5.16x1017 ± 1.7x1016kg [G11a]
densityρ:(1± 1/0.5 g/cm3) [*A]
Hill radiusrH:270000 km [*D]

other data, primary:

diameterdp:81± 19 km [G11a]
rotation periodRPp:3.4± 1.1h [K06a]
amplitude in mag., rotationalΔM:0.34± 0.06 [K06a]
pole directionΒ, λ:?,?

other data, secondary:

diameterds:80km [*D]
diameter ratiods/dp:0.986 [G11a]
component mag. differenceΔM:0.61 [K06a]
rotation periodRPs:7.1± 2.9h [K06a]

-- 2003 QY90 --discovery and notes:

Primary discovered2003 Aug 24from Cerro Tololo Observatory, La Serena, Chileby M. W. Buie.Linked to prediscovery observations from 2000 Aug 27.

Companion discovered2003 Oct 23usingimaging observations.Announced2003 Oct 29.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


©2003-2012, 2014by Wm. Robert Johnston.
Last modified20 September 2014.
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