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Asteroids with Satellites Database--Johnston's Archive

(139775) 2001 QG298

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:TNO, plutino


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

semimajor axisa:39.3003 AU
orbital periodP:246.373389495723 yr
(= 89989.4 d)
eccentricitye:0.19179
perihelion distanceq:31.76273 AU
aphelion distanceQ:46.8378 AU
inclinationi:6.49771°
argument of perihelionω:209.686°
ascending nodeΩ:162.59564°
mean anomalyM:5.5239°
perihelion passageTP:2011 Feb 27
Epoch:2014 Dec 09
data arc:2001-2010(73 obs.)
Earth MOID:30.7648 AU
Jupiter Tisserand invariantTJ:5.492
Neptune Tisserand invariantTN:2.99473287931401 [*D]

orbital data, secondary:

semimajor axisas:172 km[T04a]
separation/primary radiusas/rp:2.55 [*D]
separation/Hill radiusas/rH:0.00060 [*D]
orbital periodPs:0.573933± 0.000017d [S04a]
eccentricityes:?
normalized ang. mom.αL:?
other data, system (combined):
absolute mag.H:7.2[MPC]
slope parameterG:(0.15) [*A]
effective diameterdE:179 km [*D]
geometric albedo:0.1[T04a]
color indexU-B:?
color indexB-V:1[S04a]
color indexV-R:0.6 ± 0.02 [S04a]
color indexB-R:1.6 [S04a]
taxonomic type:?
massm:1.34x1018kg [*D]
densityρ:0.56± 0.02 g/cm3[D15a]
Hill radiusrH:290000 km [*D]

other data, primary:

diameterdp:135 km [*D]
dimensions:164 x 130 x 116km [T04a]
rotation periodRPp:13.7744± 0.0004h [S04a]
amplitude in mag., rotationalΔM:1.14± 0.04 [S04a]
pole directionΒ, λ:110 ± 4°,-18 ± 17° [D15a]

other data, secondary:

diameterds:117km [*D]
dimensions:168 x 160 x 150km [T04a]
diameter ratiods/dp:0.867 [*D]
component mag. differenceΔM:0.3 [*D]
rotation periodRPs:?

--(139775) 2001 QG298 --discovery and notes:

Primary discovered2001 Aug 19from Cerro Tololo Observatory, La Serena, Chileby M. W. Buie.Permanent number assigned 2006 Dec 05.

Companion discovered2003 Sep 12usinglightcurve observations.Announced2004 Feb 12.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


©2004-2009, 2014by Wm. Robert Johnston.
Last modified16 November 2014.
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