Astronomy:2020 HS7

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Short description: Near-Earth asteroid


2020 HS7
Discovery[1][2]
Discovered byPan-STARRS 2
Discovery siteHaleakala Obs.
Discovery date27 April 2020
Designations
2020 HS7
Minor planet categoryNEO · Apollo[3][1]
Orbital characteristics[3]
Epoch 9 August 2022 (JD 2459800.5)
Uncertainty parameter 6
Observation arc1 day
|{{{apsis}}}|helion}}2.904 AU
|{{{apsis}}}|helion}}0.793 AU
1.849
Eccentricity0.5709
Orbital period2.51 yr (918 days)
Mean anomaly308.988°
Mean motion0° 23m 31.807s / day
Inclination4.732°
Longitude of ascending node38.531°
245.692°
Physical characteristics
Dimensionsa/b = ≥1.04[4]
Mean diameter4–8 m[5]
Rotation period2.9945±0.0002 s[4]
2.9938±0.0002 s[4]
Absolute magnitude (H)29.10±0.36[3]


2020 HS7 is a very small asteroid classified as a near-Earth object of the Earth-crossing Apollo group. When it was discovered by the Pan-STARRS 2 survey on 27 April 2020, the asteroid was initially calculated to have a 10% chance of impact with Earth before being ruled out by improved orbit determinations from additional observations.[6] Although there is now no risk of impact with Earth, it did make a close approach 42,700 kilometres (26,500 mi) from Earth on 28 April 2020, with a flyby speed of 15.6 kilometres per second (9.7 mi/s) relative to Earth.[3][7][5] The asteroid will not make any close encounters within 1 lunar distance (380,000 km; 240,000 mi) of Earth in the next 100 years.[3]

Observations by Kiso Observatory in Nagano, Japan show that the asteroid rotates extremely rapidly with a rotation period of 3 seconds, making it the fastest-rotating asteroid known (As of 2022).[4] No other near-Earth asteroid of similar size is known to have a rotation period shorter than 10 seconds, which could be attributed to the tangential component of the YORP effect accelerating their rotation far beyond this period.[4] The asteroid exhibits a very small light curve amplitude of 0.07 magnitudes, which either implies a nearly spherical shape or a pole-on rotation during observations.[4]

See also

References

  1. ↑ 1.0 1.1 "2020 HS7". Minor Planet Center. http://www.minorplanetcenter.net/db_search/show_object?object_id=2020+HS7. Retrieved 15 July 2022. 
  2. ↑ "MPEC 2022-F48 : 2022 FD1". Minor Planet Electronic Circular. Minor Planet Center. 28 April 2020. https://minorplanetcenter.net/mpec/K20/K20HL2.html. Retrieved 15 July 2022. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 "JPL Small-Body Database Browser: (2020 HS7)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2020HS7&view=OPC. Retrieved 29 July 2020. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Beniyama, Jin (2022). "Video observations of tiny near-Earth objects with Tomo-e Gozen". Publications of the Astronomical Society of Japan 74 (4): 877–903. doi:10.1093/pasj/psac043. 
  5. ↑ 5.0 5.1 Bartels, Meghan (5 May 2020). "Tiny asteroid's super-close Earth flyby shows planetary protection in action, scientists say". https://www.space.com/asteroid-2020-hs7-earth-close-flyby-planetary-protection.html. 
  6. ↑ "ESA space situational awareness 2020HS7". European Space Agency. http://neo.ssa.esa.int/search-for-asteroids?tab=summary&des=2020HS7. 
  7. ↑ Malik, Tariq (28 April 2020). "Small asteroid zips safely by Earth just ahead of a larger space rock's flyby". https://www.space.com/small-asteroid-2020-hs7-buzzes-earth-ahead-of-big-space-rock.html. 

External links



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