(251732) 1998 HG₄₉

(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]

(251732) 1998 HG₄₉

Discovery [1][2][3]
Discovered by	Spacewatch
Discovery site	Kitt Peak National Obs.
Discovery date	27 April 1998
Designations
MPC designation	(251732) 1998 HG49
Alternative designations	1998 HG49
Minor planet category	Amor NEO [1][2]
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
Semi-major axis	1.2006 AU
Eccentricity	0.1126
Orbital period	1.32 yr (480 days)
Mean anomaly	100.57°
Mean motion	0° 44^m 57.48^s / day
Inclination	4.1954°
Longitude of ascending node	44.829°
Argument of perihelion	324.29°
Earth MOID	0.0767 AU (29.9 LD)
Physical characteristics
Mean diameter	0.13–0.29 km (estimate)[3]
Absolute magnitude (H)	21.7[1] 21.8[3]

Description

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]

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 28 November 2010.[6] As of 2018, it has not been named.[2]

See also

• (225312) 1996 XB27
• (350462) 1998 KG3

References

1. "JPL Small-Body Database Browser: 251732 (1998 HG49)" (2015-03-24 last obs.). Jet Propulsion Laboratory. Retrieved 17 January 2018.
2. "251732 (1998 HG49)". Minor Planet Center. Retrieved 17 January 2018.
3. NeoDys-2 Retrieved 2011-09-05
4. 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.
5. JPL close-approach data Retrieved 2011-09-05
6. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 February 2018.

External links

• Asteroid Lightcurve Database (LCDB), query form (info)
• (251732) 1998 HG49 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• (251732) 1998 HG49 at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical Properties · Summary
• (251732) 1998 HG49 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters