Yellow Bellied Flycatcher

by | Feb 25, 2018 | Flycatchers

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2021 SG is a near-Earth asteroid, with an estimated diameter of 42 to 94 meters, that passed about half a lunar distance from Earth on 16 September 2021. It approached from the direction of the Sun, so it was invisible until a day later.[6] It completes its highly eccentric orbit in 2.24 years. 2021 SG is an Apollo asteroid with a 1.71 AU semimajor axis, and a 0.473 AU perihelion (near Mercury at perihelion) out to a 2.95 AU aphelion (between Mars and Jupiter). With an absolute magnitude (H) of 24.0, it is possibly the largest asteroid to pass within 1 lunar distance of Earth during 2021.[2]

References

  1. ^ a b "2021 SG". Minor Planet Center. International Astronomical Union. Retrieved 11 December 2021.
  2. ^ a b c "MPEC 2021-S24 : 2021 SG". Minor Planet Electronic Circular. Minor Planet Center. 17 September 2021. Retrieved 11 December 2021.
  3. ^ "2021 SG". NEO Exchange. Las Cumbres Observatory. 17 September 2021. Retrieved 11 December 2021.
  4. ^ a b c "JPL Small-Body Database Browser: (2021 SG)" (2021-09-24 last obs.). Jet Propulsion Laboratory. Retrieved 11 December 2021.
  5. ^ "NEO Earth Close Approaches". Center for Near Earth Asteroid Studies. Jet Propulsion Laboratory. Retrieved 11 December 2021.
  6. ^ "EarthSky | Asteroid 2021 SG came from the sun's direction". 20 September 2021.
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