Astronomy:2002 AT4
| Discovery[1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab's ETS |
| Discovery date | 8 January 2002 (first observed only) |
| Designations | |
| 2002 AT4 | |
| Minor planet category | NEO · Amor · PHA[1][2] |
| Orbital characteristics[2] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 4.94 yr (1,805 d) |
| |{{{apsis}}}|helion}} | 2.7000 AU |
| |{{{apsis}}}|helion}} | 1.0339 AU |
| 1.8670 AU | |
| Eccentricity | 0.4462 |
| Orbital period | 2.55 yr (932 d) |
| Mean anomaly | 260.39° |
| Mean motion | 0° 23m 11.04s / day |
| Inclination | 1.4997° |
| Longitude of ascending node | 323.48° |
| 203.06° | |
| Earth MOID | 0.043 AU (16.8 LD) |
| Physical characteristics | |
| Mean diameter | 350 m (est. at 0.047) |
| SMASS = D[2] | |
| Absolute magnitude (H) | 21.2[2] |
2002 AT4 is a near-Earth object and potentially hazardous asteroid of the Amor group, approximately 350 meters (1,100 feet) in diameter. It has an eccentric orbit that brings it sometimes close to Earth's orbit, and sometimes halfway between Mars and Jupiter. It is a dark D-type asteroid[3] which means that it may be reddish in color.
Due to its relatively low transfer cost of ~5.5 km/s,[4] 2002 AT4 was under consideration by the European Space Agency as a candidate target for the Don Quijote mission to study the effects of impacting a spacecraft into an asteroid; however, it is no longer under consideration.[5]
2002 AT4 orbits the Sun at a distance of 1.0–2.7 AU once every 2 years and 7 months (932 days; semi-major axis of 1.87 AU). Its orbit has an eccentricity of 0.45 and an inclination of 1° with respect to the ecliptic.[2]
References
- ↑ 1.0 1.1 "2002 AT4". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=2002+AT4. Retrieved 8 November 2018.
- ↑ 2.0 2.1 2.2 2.3 2.4 "JPL Small-Body Database Browser: (2002 AT4)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3102743. Retrieved 8 November 2018.
- ↑ Binzel, Richard P. (August 2004). "Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes". Icarus 170 (2): 259–294. doi:10.1016/j.icarus.2004.04.004. Bibcode: 2004Icar..170..259B. Archived from the original on 2009-05-14. https://www.webcitation.org/5glwslK30?url=http://www.mtholyoke.edu/courses/tburbine/tomburbine/binzel.2004.pdf. Retrieved 2009-04-20.
- ↑ "NEA delta_v for spacecraft rendezvous missions". http://echo.jpl.nasa.gov/~lance/delta_v/delta_v.rendezvous.html.
- ↑ "ESA". http://www.esa.int/SPECIALS/NEO/SEMVXVB1S6F_0.html.
External links
- MPEC 2002-A53, Minor Planet Electronic Circular
- List of the Potentially Hazardous Asteroids (PHAs), Minor Planet Center
- PHA Close Approaches To The Earth, Minor Planet Center
- List Of Amor Minor Planets (by designation), Minor Planet Center
- 2002 AT4 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
- 2002 AT4 at ESA–space situational awareness
- 2002 AT4 at the JPL Small-Body Database
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