Astronomy:(458732) 2011 MD5
From HandWiki
Short description: Apollo near-Earth asteroid
| Discovery[1][2] | |
|---|---|
| Discovered by | Pan-STARRS 1 |
| Discovery site | Haleakala Obs. |
| Discovery date | 30 June 2011 |
| Designations | |
| (458732) 2011 MD5 | |
| 2011 MD5 | |
| Minor planet category | |
| Orbital characteristics[3] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 8.67 yr (3,165 d) |
| |{{{apsis}}}|helion}} | 3.9869 AU |
| |{{{apsis}}}|helion}} | 0.9895 AU |
| 2.4882 AU | |
| Eccentricity | 0.6023 |
| Orbital period | 3.92 yr (1,434 d) |
| Mean anomaly | 49.188° |
| Mean motion | 0° 15m 3.96s / day |
| Inclination | 10.553° |
| Longitude of ascending node | 170.34° |
| 224.84° | |
| Earth MOID | 0.0627 AU (24.4 LD) |
| Physical characteristics | |
| Mean diameter | 730–1600 m (CNEOS)[4] 0.8 km[5] 1.2 km |
| Absolute magnitude (H) | 17.8[3] 17.9[2] |
(458732) 2011 MD5 is an Apollo near-Earth asteroid around 1.2 kilometers (0.75 miles) in diameter. It is the largest asteroid known to have passed closer than the Moon.[4] On 17 September 1918 the asteroid passed 0.00234 AU (350 thousand km; 0.91 LD) from Earth[3] with a peak apparent magnitude of around 8.4. The 1918 close approach distance is known with an accuracy of roughly ±120 km. The asteroid had come to opposition (opposite the Sun in the sky) on 9 August 1918 at magnitude 16.
2011 MD5 was not discovered until 30 June 2011,[1] when the asteroid was 1.3 astronomical unit|AU (190 million km) from Earth. As of 2023, the asteroid has a 12-year observation arc and a well determined orbit.
References
- ↑ 1.0 1.1 "MPEC 2011-N15 : 2011 MD5". IAU Minor Planet Center. 2011-07-03. https://minorplanetcenter.net//mpec/K11/K11N15.html. Retrieved 2020-06-14. (K11M05D)
- ↑ 2.0 2.1 2.2 "458732 (2011 MD5)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=458732. Retrieved 15 June 2020.
- ↑ 3.0 3.1 3.2 3.3 "JPL Small-Body Database Browser: 458732 (2011 MD5)". Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=458732;cad=1. Retrieved 2020-06-14.
- ↑ 4.0 4.1 NEO Earth Close Approaches @ JPL CNEOS
Select "Nominal dist <= 1 LD", "Past only", Sort by "H (mag)" - ↑ "LCDB Data for (458732)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=458732. Retrieved 15 June 2020.
External links
- (458732) 2011 MD5 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
- (458732) 2011 MD5 at ESA–space situational awareness
- (458732) 2011 MD5 at the JPL Small-Body Database
 |  |
