(251732) 1998 HG49, provisional designation 1998 HG49, is a sub-kilometer asteroid and near-Earth object of the Amor group, approximately 200 meters in diameter. It was discovered on 27 April 1998 by astronomers of the Spacewatch program at the Kitt Peak National Observatory near Tucson, Arizona, United States.[2]
| Discovery[1][2][3] | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak National Obs. |
| Discovery date | 27 April 1998 |
| Designations | |
| (251732) 1998 HG49 | |
| 1998 HG49 | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 16.91 yr (6,175 days) |
| Aphelion | 1.3357 AU |
| Perihelion | 1.0654 AU |
| 1.2006 AU | |
| Eccentricity | 0.1126 |
| 1.32 yr (480 days) | |
| 100.57° | |
| 0° 44m 57.48s / day | |
| Inclination | 4.1954° |
| 44.829° | |
| 324.29° | |
| Earth MOID | 0.0767 AU (29.9 LD) |
| Physical characteristics | |
| 0.13–0.29 km (estimate)[3] | |
1998 HG49 is an Amor asteroid because its perihelion is less than 1.3 AU and does not cross Earth’s orbit. It is on a low-eccentricity and low-inclination orbit between the orbits of Earth and Mars. This is within a region of stability where bodies may survive for the age of the Solar System, and hence it may have formed near its current orbit.[4]
The asteroid orbits the Sun at a distance of 1.1–1.3 AU once every 1 year and 4 months (480 days; semi-major axis of 1.20 AU). Its orbit has an eccentricity of 0.11 and an inclination of 4° with respect to the ecliptic.[1] The body’s observation arc begins with its official discovery observation at Kitt Peak in April 1998.[2]
Between 1900 and 2200 its closest approach to Earth is more than 0.14 AU.[5]
This minor planet was numbered by the Minor Planet Center on 28 November 2010.[6] As of 2018, it has not been named.[2]
- ^ a b c d e “JPL Small-Body Database Browser: 251732 (1998 HG49)” (2015-03-24 last obs.). Jet Propulsion Laboratory. Retrieved 17 January 2018.
- ^ a b c d e “251732 (1998 HG49)”. Minor Planet Center. Retrieved 17 January 2018.
- ^ a b c NeoDys-2 Retrieved 2011-09-05
- ^ Evans, N. Wyn; Tabachnik, Serge (May 1999). “Possible long-lived asteroid belts in the inner Solar System”. Nature. 399 (6731): 41. arXiv:astro-ph/9905067. Bibcode:1999Natur.399…41E. doi:10.1038/19919. S2CID 4418335.
- ^ JPL close-approach data Retrieved 2011-09-05
- ^ “MPC/MPO/MPS Archive”. Minor Planet Center. Retrieved 25 February 2018.
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- (251732) 1998 HG49 at NeoDyS-2, Near Earth Objects—Dynamic Site
- (251732) 1998 HG49 at ESA–space situational awareness
- (251732) 1998 HG49 at the JPL Small-Body Database
