(458732) 2011 MD5
Appearance
Discovery [1][2] | |
---|---|
Discovered by | Pan-STARRS 1 |
Discovery site | Haleakala Obs. |
Discovery date | 30 June 2011 |
Designations | |
(458732) 2011 MD5 | |
2011 MD5 | |
Orbital characteristics [3] | |
Epoch 31 May 2020 (JD 2459000.5) | |
Uncertainty parameter 0 | |
Observation arc | 8.67 yr (3,165 d) |
Aphelion | 3.9869 AU |
Perihelion | 0.9895 AU |
2.4882 AU | |
Eccentricity | 0.6023 |
3.92 yr (1,434 d) | |
49.188° | |
0° 15m 3.96s / day | |
Inclination | 10.553° |
170.34° | |
224.84° | |
Earth MOID | 0.0627 AU (24.4 LD) |
Physical characteristics | |
730–1600 m (CNEOS)[4] 0.8 km[5] 1.2 km | |
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 ± 200 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 AU (190 million km) from Earth. The asteroid now has a 8 year observation arc and a well determined orbit.
References
- ^ a b "MPEC 2011-N15 : 2011 MD5". IAU Minor Planet Center. 3 July 2011. Retrieved 14 June 2020. (K11M05D)
- ^ a b c "458732 (2011 MD5)". Minor Planet Center. Retrieved 15 June 2020.
- ^ a b c d "JPL Small-Body Database Browser: 458732 (2011 MD5)". Jet Propulsion Laboratory. Archived from the original on 2 May 2020. Retrieved 14 June 2020.
- ^ a b 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). Retrieved 15 June 2020.
External links
- (458732) 2011 MD5 at NeoDyS-2, Near Earth Objects—Dynamic Site
- (458732) 2011 MD5 at ESA–space situational awareness
- (458732) 2011 MD5 at the JPL Small-Body Database