(118378) 1999 HT11
| Discovery Perihelion | 38.734 AU | |
|---|---|---|
| 43.868 AU | ||
| Eccentricity | 0.1170 | |
| 290.55 yr (106,124 d) | ||
| 328.33° | ||
| 0° 0m 12.24s / day | ||
| Inclination | 5.0489° | |
| 87.954° | ||
| 189.27° | ||
| Physical characteristics | ||
Mean diameter | 134 km (est. at 0.09)[4] | |
| 23.42[8] | ||
| 7.6[2][3] | ||
(118378) 1999 HT11 (
very red object measures approximately 134 kilometers (83 miles) in diameter. As of 2021[update], it has not been named
.
Discovery
1999 HT11 was first observed on the night of 17 April 1999, by astronomers using the 4-meter
Mark Wagner as well as Kim Falinski. Follow-up observations with the Nordic Optical Telescope at the Roque de los Muchachos Observatory, La Palma, Spain, were made three weeks later. The body's observation arc begins with its official discovery observation at Kitt Peak on 17 April 1999.[1][2]
Orbit and classification
This
come to perihelion in 2047.[3]
1999 HT11 is a
twotinos
(1:2) which form the inner and outer rim of the Kuiper belt, respectively.
Numbering and naming
This
M.P.C. 55526).[9] As of 2021[update], it has not been named.[2] According to the established naming conventions, it will be given a mythological name associated with the underworld or with creation.[10]
Physical characteristics
1999 HT11 has a very red surface color (
tholins
, polymer-like organic compounds, formed by long exposures to solar and cosmic radiation.
Based on a generic magnitude-to-diameter conversion, 1999 HT11 measures approximately 134 kilometers (83 miles) in diameter, for an assumed
References
- ^ Minor Planet Electronic Circular. Minor Planet Center. 19 May 1999. Retrieved 9 September 2021.
- ^ a b c d e f "118378 (1999 HT11)". Minor Planet Center. Retrieved 11 September 2021.
- ^ a b c d e f g "JPL Small-Body Database Browser: 118378 (1999 HT11)" (2020-01-26 last obs.). Jet Propulsion Laboratory. Retrieved 11 September 2021.
- ^ a b c d e f "List of Known Trans-Neptunian Objects". Johnston's Archive. 18 August 2020. Retrieved 11 September 2021.
- ^ a b "Orbit Fit and Astrometric record for 118378". Southwest Research Institute. Retrieved 11 September 2021. (The Deep Ecliptic Survey Object Classifications)
- ^ S2CID 53746049.
- ^ a b c d "LCDB Data for (118378)". Asteroid Lightcurve Database (LCDB). Retrieved 11 September 2021.
- ^ a b "Asteroid (118378) 1999 HT11 – Ephemerides". AstDyS-2, Asteroids – Dynamic Site. Retrieved 11 September 2021.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 11 September 2021.
- ^ "Naming of Astronomical Objects – Minor planets". IAU – International Astronomical Union. Retrieved 11 September 2021.
- ^ "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 11 September 2021.
- ^ Brown, Michael E. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 11 September 2021.
External links
- List of Transneptunian Objects, Minor Planet Center
- (118378) 1999 HT11, Small Bodies Data Ferret
- Discovery Circumstances: Numbered Minor Planets (115001)-(120000), Minor Planet Center
- (118378) 1999 HT11 at AstDyS-2, Asteroids—Dynamic Site
- (118378) 1999 HT11 at the JPL Small-Body Database
