2020 HS7
| Discovery[1][2] | |
|---|---|
| Discovered by | Pan-STARRS 2 |
| Discovery site | Haleakala Obs. |
| Discovery date | 27 April 2020 |
| Designations | |
| 2020 HS7 | |
| NEO·Apollo[3][1] | |
| Orbital characteristics[3] | |
| Epoch9 August 2022 (JD2459800.5) | |
| Uncertainty parameter6 | |
| Observation arc | 1 day |
| Aphelion | 2.904 AU |
| Perihelion | 0.793 AU |
| 1.849 | |
| Eccentricity | 0.5709 |
| 2.51 yr (918 days) | |
| 308.988° | |
| 0° 23m31.807s/ day | |
| Inclination | 4.732° |
| 38.531° | |
| 245.692° | |
| Physical characteristics | |
| Dimensions | a/b= ≥1.04[4] |
| 4–8m[5] | |
| 2.9945±0.0002 s[4] 2.9938±0.0002 s[4] | |
| 29.10±0.36[3] | |
2020 HS7is a very small asteroid classified as anear-Earth objectof the Earth-crossingApollo group.When it was discovered by thePan-STARRS 2survey on 27 April 2020, the asteroid was initially calculated to have a 10% chance of impact with Earth before being ruled out by improvedorbit determinationsfrom 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 1lunar distance(380,000 km; 240,000 mi) of Earth in the next 100 years.[3]
Observations byKiso ObservatoryinNagano, Japanshow that the asteroid rotates extremely rapidly with arotation periodof 3 seconds, making it thefastest-rotating asteroidknown as of 2022[update].[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 theYORP effectaccelerating their rotation far beyond this period.[4]The asteroid exhibits a very smalllight curveamplitude of 0.07magnitudes,which either implies a nearly spherical shape or a pole-on rotation during observations.[4]
See also
[edit]References
[edit]- ^ab"2020 HS7".Minor Planet Center.Retrieved15 July2022.
- ^"MPEC 2022-F48: 2022 FD1".Minor Planet Electronic Circular.Minor Planet Center. 28 April 2020.Retrieved15 July2022.
- ^abcde"JPL Small-Body Database Browser: (2020 HS7)"(2022-04-28 last obs.).Jet Propulsion Laboratory.Retrieved29 July2020.
- ^abcdefBeniyama, Jin; et al. (2022). "Video observations of tiny near-Earth objects with Tomo-e Gozen".Publications of the Astronomical Society of Japan.74(4): 877–903.arXiv:2207.07071.doi:10.1093/pasj/psac043.
- ^abBartels, Meghan (5 May 2020)."Tiny asteroid's super-close Earth flyby shows planetary protection in action, scientists say".Space.com.
- ^"ESA space situational awareness 2020HS7".European Space Agency.Retrieved29 July2020.
- ^Malik, Tariq (28 April 2020)."Small asteroid zips safely by Earth just ahead of a larger space rock's flyby".Space.com.
External links
[edit]- 2020 HS7atNeoDyS-2, Near Earth Objects—Dynamic Site
- 2020 HS7atESA–space situational awareness
- 2020 HS7at theJPL Small-Body Database
