Astronomy:2020 AP1

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Short description: Near-Earth asteroid in January 2022


2020 AP1
Discovery[1]
Discovered byMLS
Discovery siteMount Lemmon Obs.
Discovery date4 January 2020
Designations
2020 AP1
Minor planet categoryNEO–Apollo [2]
Orbital characteristics[2]
Epoch 2020-May-31 (JD 2459000.5)
Uncertainty parameter 7
Observation arc1 day
|{{{apsis}}}|helion}}2.196 astronomical unit|AU (328,500,000 km) (Q)
|{{{apsis}}}|helion}}0.9810 AU (146,760,000 km) (q)
1.588 AU (237,600,000 km) (a)
Eccentricity0.3824 (e)
Orbital period2.002 yr
Mean anomaly77.83° (M)
Inclination2.256° (i)
Longitude of ascending node101.2° (Ω)
|{{{apsis}}}|helion}}25 December 2021
349.7° (ω)
Earth MOID0.0014 AU (210,000 km; 0.54 LD)
Jupiter MOID3.0 AU (450,000,000 km)
Physical characteristics
Mean diameter3–7 meters (CNEOS)
Absolute magnitude (H)29.6[2]


2020 AP1 is an Apollo near-Earth object roughly 5 meters (20 feet) in diameter. On 2 January 2020 it passed 0.00218 astronomical unit|AU (326 thousand km; 0.85 LD) from Earth. With a short 1-day observation arc it was roughly expected to pass about 0.01 astronomical unit|AU (1.5 million km; 3.9 LD) from Earth on 7 January 2022, but with an uncertainty of ±8 days for the close approach date it could have passed significantly closer or further.

2022 close approach[2]
Date JPL SBDB
nominal geocentric
distance 		uncertainty
region
(3-sigma)
2022-01-07.7 ± 8.3 days 1.7 million km ± 2.5 million km[3]

Discovery

2020 AP1 came to perihelion (closest approach to the Sun) on 24 December 2020. On 2 January 2020 it passed 0.00218 astronomical unit|AU (326 thousand km; 0.85 LD) from Earth.[2] It was then discovered by the Mount Lemmon Survey on 4 January 2020, when it was 0.006 AU (900 thousand km; 2.3 LD) from Earth and had a solar elongation of 134°.[1] Being such a small and faint asteroid with the bright glare of the waxing gibbous moon in the sky, it was only observed for 1 day. The Earth approach increased the asteroid's orbital period by roughly 21 days.

2022

The asteroid came to perihelion around 25 December 2021. The poorly constrained orbit has the asteroid passing 0.01 astronomical unit|AU (1.5 million km; 3.9 LD) from Earth on 7 January 2022 with an uncertainty region of about ±2.5 million km extending over ±8 days.[2]

The JPL Small-Body Database shows a linear minimum possible distance of 0.000007 AU (1,000 km) from the center of Earth,[2] which would be inside of the 6,371 km radius of Earth. It is not listed on the more thorough Sentry Risk Table[4] because Sentry accounts for orbit propagation nonlinearities along the line of variations and the nonlinearities do not intersect where Earth will be.

See also

  • 2018 AH – Short arc object approaching in December 2021
  • 2009 JF1 – Short arc object possibly approaching in May 2022

References

  1. ↑ 1.0 1.1 "MPEC 2020-A67 : 2020 AP1". IAU Minor Planet Center. 2020-01-05. https://minorplanetcenter.net/mpec/K20/K20A67.html. Retrieved 2020-12-18.  (K20A01P)
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 "JPL Small-Body Database Browser: (2020 AP1)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2020AP1&view=OPC. Retrieved 2020-12-18. 
  3. ↑ "Horizons Batch for 2022-Jan-07 17:32 UT". JPL Horizons. https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272020+AP1%27&START_TIME=%272022-Jan-07%2017:32%27&STOP_TIME=%272022-Jan-08%27&STEP_SIZE=%271+day%27&QUANTITIES=%2720,39%27. Retrieved 2021-12-20. 
  4. ↑ 2020 AP1 is not listed on the Sentry Risk Table

External links



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