(458732) 2011 MD5

(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.

(458732) 2011 MD5
Discovery [1][2]
Discovered byPan-STARRS 1
Discovery siteHaleakala Obs.
Discovery date30 June 2011
Designations
(458732) 2011 MD5
2011 MD5
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc8.67 yr (3,165 d)
Aphelion3.9869 AU
Perihelion0.9895 AU
2.4882 AU
Eccentricity0.6023
3.92 yr (1,434 d)
49.188°
0° 15m 3.96s / day
Inclination10.553°
170.34°
224.84°
Earth MOID0.0627 AU (24.4 LD)
Physical characteristics
Mean diameter
730–1600 m (CNEOS)[4]
0.8 km[5]
1.2 km
17.8[3]
17.9[2]

    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
    1. "MPEC 2011-N15 : 2011 MD5". IAU Minor Planet Center. 3 July 2011. Retrieved 14 June 2020. (K11M05D)
    2. "458732 (2011 MD5)". Minor Planet Center. Retrieved 15 June 2020.
    3. "JPL Small-Body Database Browser: 458732 (2011 MD5)". Jet Propulsion Laboratory. Archived from the original on 2 May 2020. Retrieved 14 June 2020.
    4. NEO Earth Close Approaches @ JPL CNEOS
      Select "Nominal dist <= 1 LD", "Past only", Sort by "H (mag)"
    5. "LCDB Data for (458732)". Asteroid Lightcurve Database (LCDB). Retrieved 15 June 2020.
    This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.