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(119979) 2002 WC19

Trans-Neptunian object

Field	Value
minorplanet	yes
background	#C2E0FF
name
image	2002 WC19.jpg
caption	and its satellite imaged by the Hubble Space Telescope in 2006
discoverer	Palomar Observatory
discovered	16 November 2002
mpc_name
mp_category	Twotino
binary
orbit_ref
epoch	13 January 2016 (JD 2457400.5)
semimajor	48.010 AU
perihelion	35.289 AU
time_periastron	≈ 5 November 2056
±3 days
aphelion	60.732 AU
eccentricity	0.26498
period	332.67 yr (121,507 d)
inclination	9.1746°
asc_node	109.7547°
arg_peri	44.356°
mean_anomaly	316.02°
satellites	1 (81 km)
dimensions
mass	(prograde) or
(retrograde)
density	for the average of prograde and retrograde masses
( if prograde,
if retrograde)
albedo	0.05
abs_magnitude	4.9
mean_motion	/ day
observation_arc	3978 days (10.89 yr)
uncertainty	3
moid	34.3056 AU
jupiter_moid	29.9229 AU

binary ±3 days (retrograde) ( if prograde, if retrograde)

**** (provisional designation ****) is a twotino, that is, a trans-Neptunian object in a 1:2 orbital resonance with Neptune. It was discovered on November 16, 2002 at the Palomar Observatory. Its estimated diameter predicts a density comparable to that of Pluto, which would be unusual as it is much smaller than the expected size at which a Kuiper belt object would normally becomes solid. However, the error bar for the density is 50%, consistent with the density of water ice to within one sigma.

Knowing how many twotinos there are may reveal whether Neptune took roughly 1 million or 10 million years to migrate about 7 AU from its birth location.

Satellite

On February 27, 2007, a natural satellite was reported to be orbiting . It is estimated to be from the primary, with an orbital period of days, an eccentricity of and an inclination of . Assuming similar albedos, it is a quarter the diameter of its primary, or around 81 km in diameter. file:2002WC19-orbit.png|Orbit of compared to Pluto and Neptune|alt=alt language file:TNO-2002WC19.gif|1:2 libration over 20,000 years – Neptune is held stationary (dot at 5 o'clock); orbit of Uranus in blue|alt=alt language

References

|author-link=Marc W. Buie

References

[http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2002WC19 JPL Horizons] Observer Location: @sun (Perihelion occurs when deldot changes from negative to positive. Uncertainty in time of perihelion is [[3-sigma]].)
(December 2019). "Mutual orbit orientations of transneptunian binaries". Icarus.

Info: Wikipedia Source

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twotinos discoveries-by-the-palomar-observatory binary-trans-neptunian-objects astronomical-objects-discovered-in-2002

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