astro.wikisort.org - Asteroid

1999 TR₁₁, 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 kilometers (58 miles) 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's 2.2-meter telescope.[1][2]

1999 TR₁₁

Discovery[1][2]
Discovered by	S. S. Sheppard[3]
Discovery site	Mauna Kea Obs.
Discovery date	9 October 1999 (first observed only)
Designations
MPC designation	1999 TR11
Minor planet category	TNO[4] · plutino[5] distant[1]
Orbital characteristics[4]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 6
Observation arc	1.23 yr (448 d)
Aphelion	48.670 AU
Perihelion	29.697 AU
Semi-major axis	39.184 AU
Eccentricity	0.2421
Orbital period (sidereal)	245.28 yr (89,589 d)
Mean anomaly	36.718°
Mean motion	0° 0m 14.4s / day
Inclination	17.163°
Longitude of ascending node	54.786°
Argument of perihelion	346.17°
Physical characteristics
Mean diameter	93 km (est.)[5]
Geometric albedo	0.09 (assumed)[5]
Spectral type	RR (very red)[5] B–V = 1.020[6] V–R = 0.750[6]
Absolute magnitude (H)	8.4[1][4] 8.63[6]

Orbit and classification

1999 TR₁₁ 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.[4] 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.[1]

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 are making 2 orbits for every 3 Neptune makes.

Numbering and naming

As of 2018, 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.[1]

Physical characteristics

1999 TR₁₁ has a very reddish color (RR), indicative of a non-carbonaceous composition rich in tholins and methane.[5] According to the 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.[5] Since it is far too small for being considered a dwarf planet candidate, it is not listed at Michael Brown's website.[7] As of 2018, no rotational lightcurve of 1999 TR₁₁ has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[4][8]

References

External links

• 1999 TR11, Sheppard, S., Marsden, B. G. 1999, Minor Planet Electronic Circular, 1999-T51
• List of Transneptunian Objects, Minor Planet Center
• 1999 TR11 at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1999 TR11 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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