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Asteroids with Satellites Database--Johnston's Archive

2004 KE19

compiled by Wm. Robert Johnston
last updated17 August 2019

--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:44.72 AU
orbital periodP:299.07 yr
(= 109233.8 d)
eccentricitye:0.05413
perihelion distanceq:42.2999 AU
aphelion distanceQ:47.141 AU
inclinationi:1.17272°
argument of perihelionω:264.82°
ascending nodeΩ:292.678°
mean anomalyM:44.87°
perihelion passageTP:1982 Jan 15.5
Epoch:2019 Apr 27
data arc:2004-2016(22 obs.)
Earth MOID:41.299 AU
Jupiter Tisserand invariantTJ:5.97

orbital data, secondary:

semimajor axisas:4110± 70 km (separation) [G19c]
separation/primary radiusas/rp:45 [*E]
separation/Hill radiusas/rH:0.007 [*E]
orbital periodPs:36d [*E]
eccentricityes:?
normalized ang. mom.αL:?
other data, system (combined):
absolute mag.H:6.5[MPC]
7.2 ± 0.5 [G19c]
slope parameterG:(0.15) [*A]
effective diameterdE:221 km [*E]
geometric albedo:(0.09) [*A]
color indexU-B:?
color indexB-V:?
taxonomic type:?
massm:?
densityρ:(1 g/cm3) [*A]
Hill radiusrH:600000 km [*E]

other data, primary:

diameterdp:184 km [*E]
rotation periodRPp:?
amplitude in mag., rotationalΔM:?
pole directionΒ, λ:?,?

other data, secondary:

diameterds:123km [*E]
diameter ratiods/dp:0.67 [*D]
component mag. differenceΔM:0.88 [G19c]
rotation periodRPs:?

-- 2004 KE19 --discovery and notes:

Primary discovered2004 May 24from Mauna Kea Observatory, Hawaii, USAby B. Gladman.

Companion discovered2019 Jun 08usingHubble Space Telescope observations.Announced2019 Aug [G19c].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


©2019by Wm. Robert Johnston.
Last modified17 August 2019.
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