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Asteroids with Satellites Database--Johnston's Archive

(53432) 1999 UT55

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:Mars crossing asteroid, Hungaria


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

semimajor axisa:1.871650083 AU
orbital periodP:2.560620330 yr
(= 935.266575 d)
eccentricitye:0.11587349
perihelion distanceq:1.65477546 AU
aphelion distanceQ:2.088524707 AU
inclinationi:22.438208°
argument of perihelionω:126.671892°
ascending nodeΩ:268.739716°
mean anomalyM:242.524920°
perihelion passageTP:2015 Mar 24.1958
Epoch:2014 May 23
data arc:1994-2013(308 obs.)
Earth MOID:0.7172 AU
Jupiter Tisserand invariantTJ:3.881

orbital data, secondary:

semimajor axisas:4 km[*E]
separation/primary radiusas/rp:3.1 [*E]
separation/Hill radiusas/rH:0.012 [*E]
orbital periodPs:0.5875± 0.0004d [W13d]
eccentricityes:?
normalized ang. mom.αL:?
other data, system (combined):
absolute mag.H:15.5[MPC]
slope parameterG:(0.15) [*A]
effective diameterdE:2.62 km [*E]
geometric albedo:(0.16) [*A]
color indexU-B:?
color indexB-V:?
taxonomic type:?
massm:?
densityρ:(1.6 g/cm3) [*A]
Hill radiusrH:330 km [*E]

other data, primary:

diameterdp:2.55 km [*E]
rotation periodRPp:3.330± 0.002h [W13d]
amplitude in mag., rotationalΔM:0.10± 0.01 [W13d]
amplitude in mag., mutual eventsΔM:0.10 ±0.04 [W13d]
pole directionΒ, λ:?,?

other data, secondary:

diameterds:0.59km [*E]
diameter ratiods/dp:>0.23± 0.02 [W13d]
component mag. differenceΔM:<3.2± 0.2 [*D]
rotation periodRPs:?

--(53432) 1999 UT55 --discovery and notes:

Primary discovered1999 Oct 19from Socorro, New Mexico, USAby LINEAR.Alternate designation(s): 1994 WO12, 2000 AU3.Linked to prediscovery observations from 1994 Nov 28.Permanent number assigned 2003 Feb 16.

Companion discovered2013 Jan 03usinglightcurve observations.Announced2013 Feb .

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


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