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1999 TR11

Trans-Neptunian object

Field	Value
minorplanet	yes
name
background	#C2E0FF
discovery_ref
discoverer	S. S. Sheppard
discovery_site	Mauna Kea Obs.
discovered	9 October 1999
(first observed only)
mpc_name
mp_category	TNOplutino
distant
orbit_ref
epoch	21 November 2025 (JD 2461000.5)
uncertainty	3
observation_arc	25.38 yr (9,271 d)
aphelion	49.668 AU
perihelion	29.812 AU
semimajor	39.740 AU
eccentricity	0.2498
period	250.52 yr (91,504 d)
mean_anomaly	44.628°
mean_motion	/ day
inclination	17.119°
asc_node	54.624°
arg_peri	347.52°
mean_diameter	(est.)
albedo	0.09 (assumed)
spectral_type	RR (very red)
B–V
V–R
abs_magnitude	8.4
8.63

(first observed only) distant B–V
V–R
8.63

**** is a resonant trans-Neptunian object from the Kuiper belt, located in the outermost region of the Solar System. The reddish plutino measures approximately 93 km in diameter. It was first observed on 9 October 1999, by American astronomer Scott Sheppard at the Mauna Kea Observatories with the University of Hawaii 2.2-meter telescope.

Orbit and classification

orbits the Sun at a distance of 29.7–48.7 AU once every 245 years and 3 months (89,589 days; semi-major axis of 39.18 AU). Its orbit has an eccentricity of 0.24 and an inclination of 17° with respect to the ecliptic. The body's observation arc begins with a precovery taken at Mauna Kea on 7 October 1999, just two nights prior to its official first observation.

It is a member of the plutinos, a group of resonant trans-Neptunian objects named after Pluto. Located in the inner region of Kuiper belt, the plutinos have a 2:3 orbital resonance with Neptune.

Numbering and naming

As of 2025, this minor planet has neither been numbered nor named by the Minor Planet Center. The official discoverer(s) will be defined when the object is numbered.

Physical characteristics

has a very reddish color (RR), indicative of a non-carbonaceous composition rich in tholins and methane. According to Johnston's Archive, the object only measures 93 kilometers in diameter based on an absolute magnitude of 8.4, and an assumed albedo of 0.09 for the body's surface. Since it is far too small for being considered a dwarf planet candidate, it is not listed at Michael Brown website. As of 2018, no rotational lightcurve of has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.

References

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

plutinos minor-planet-object-articles-(unnumbered) discoveries-by-scott-s.-sheppard astronomical-objects-discovered-in-1999

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