(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 AU (190 million km) from Earth. As of 2023, the asteroid has a 12-year observation arc and a well determined orbit.

References

  1. ^ a b "MPEC 2011-N15 : 2011 MD5". IAU Minor Planet Center. 3 July 2011. Retrieved 14 June 2020. (K11M05D)
  2. ^ a b c "458732 (2011 MD5)". Minor Planet Center. Retrieved 15 June 2020.
  3. ^ 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.
  4. ^ a b NEO Earth Close Approaches Archived 19 October 2017 at the Wayback Machine @ JPL CNEOS
    Select "Nominal dist <= 1 LD", "Past only", Sort by "H (mag)"
  5. ^ "LCDB Data for (458732)". Asteroid Lightcurve Database (LCDB). Archived from the original on 15 June 2020. Retrieved 15 June 2020.
Allikas: https://en.wikipedia.org/wiki/(458732)_2011_MD5
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