(118378) 1999 HT11

(118378) 1999 HT₁₁

Discovery
Discovered by	Kitt Peak National Observatory
Discovery date	17 April 1999
Designations
MPC designation	(118378) 1999 HT11
Minor planet category	TNO 4:7 resonance[1]
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 4
Observation arc	5881 days (16.10 yr)
Aphelion	49.013 AU (7.3322 Tm)
Perihelion	38.894 AU (5.8185 Tm)
Semi-major axis	43.954 AU (6.5754 Tm)
Eccentricity	0.11511
Orbital period	291.41 yr (106436 d)
Mean anomaly	323.89°
Mean motion	0° 0^m 12.176^s / day
Inclination	5.0533°
Longitude of ascending node	87.910°
Argument of perihelion	186.37°
Earth MOID	37.8761 AU (5.66618 Tm)
Jupiter MOID	33.6401 AU (5.03249 Tm)
Physical characteristics
Dimensions	146 km[3]
Geometric albedo	0.09? (assumed)
Absolute magnitude (H)	7.6

(118378) 1999 HT₁₁, also written as (118378) 1999 HT11, is a trans-Neptunian object (TNO) in a 4:7 orbital resonance with Neptune.^[1] It has a perihelion (closest approach to the Sun) at 38.858 AU and an aphelion (farthest approach from the Sun) at 49.231 AU. It is about 146 km in diameter. It was discovered on April 17, 1999, at Kitt Peak National Observatory, Arizona.

References

1. Marc W. Buie (2005-05-10). "Orbit Fit and Astrometric record for 118378". (using 25 observations) SwRI (Space Science Department). Retrieved 2009-01-29.
2. "JPL Small-Body Database Browser: 118378 (1999 HT11)". NASA/Jet Propulsion Laboratory. Retrieved 7 April 2016.
3. List of known trans-Neptunian objects Archived June 21, 2007, at WebCite

1. http://www.webcitation.org/5Pkgpyk4n?url=http%3A%2F%2Fcfa-www.harvard.edu%2Fiau%2Flists%2FTNOs.html

External links

• (118378) 1999 HT11 at the JPL Small-Body Database
  • Discovery · Orbit diagram · Orbital elements · Physical parameters