The Asteroid 2020 SW to Flyby Within an “Astronomical” Yard on September 24, 2020

Mt. Lemmon Survey discovered a 4-meter asteroid 2020 SW when it was 0.017 AU (6.616 LD) away on 2020 09 18. It will make a close approach of 0.07 lunar distances on 202 09 24. To aid in understanding how close this is let’s make a mental scale model of the Earth.

A scale model of the Earth. using a ball with a diameter of 29.21 cm (11.5 inches) [this happens to be the same as the length of a football ball(American)] to represent the Earth.
-- A CM would be 436.2204724 KM, an inch would be 1108 KM. -- The International Space Station would be 9.2 mm away. -- the Asteroid 2020 SW to Flyby ~0.5 yards -- Geosynchronous orbit would be 820.4 mm, 0.8204 m, or 0.8972 yards -- Light-second would be 6872.5 mm, 6.8725 m, or 7.5159 yards -- a Lunar distance would be 8666.1 mm, 8.6661 m, or 9.4773 yards.
A scale model of the Earth. using a ball with a diameter of 29.21 cm (11.5 inches) [this happens to be the same as the length of a football ball(American)] to represent the Earth.– A CM would be 436.2204724 KM, an inch would be 1108 KM. — The International Space Station would be 9.2 mm away. — the Asteroid 2020 SW to Flyby ~0.5 yards — Geosynchronous orbit would be 820.4 mm, 0.8204 m, or 0.8972 yards — Light-second would be 6872.5 mm, 6.8725 m, or 7.5159 yards — a Lunar distance would be 8666.1 mm, 8.6661 m, or 9.4773 yards.

The 2020 SW flybe will be ~0.5 yards from our scale model of the Earth. As of 2020-09-21 This flybe ranks 24th.

ObjectClose-Approach (CA) DateCA Distance Nominal (LD | au)H (mag)Estimated Diameter
2020QG2020-Aug-160.02 | 6.23e-529.92.8 m- 6.3 m
2011CQ12011-Feb-040.03 | 7.92e-532.11.0 m- 2.3 m
2019UN132019-Oct-310.03 | 8.43e-5321.1 m- 2.4 m
2008TS262008-Oct-090.03 | 8.44e-533.20.61 m – 1.4 m
2004FU1622004-Mar-310.03 | 8.63e-528.74.8 m- 11 m
2020CD32019-Apr-040.03 | 8.77e-531.71.2 m-2.8 m
2020JJ2020-May-04 0.03 | 8.96e-5302.7 m – 6.0 m
2018UA2018-Oct-19 0.04 | 9.14e-530.22.4 m- 5.4 m
2016DY302016-Feb-25 0.04 | 9.56e-530.52.1 m- 4.7 m
2019AS52019-Jan-08 0.04 | 0.0001032.30.92 m- 2.1 m
2020CW2020-Feb-01 0.04 | 0.0001132.50.83 m- 1.9 m
2017GM2017-Apr-04 0.04 | 0.0001129.92.8 m- 6.2 m
2017UJ22017-Oct-20 0.05 | 0.0001230.91.8 m – 3.9 m
2011MD2011-Jun-27 0.05 | 0.00012286.7 m –   15 m
2014LY212014-Jun-03 0.05 | 0.0001329.14.0 m –  9.0 m
2009VA2009-Nov-06 0.05 | 0.0001428.65.1 m – 11 m
2012 KT422012-May-29 0.05 | 0.00014294.2 m –  9.4 m
2017EA2017-Mar-020.05 | 0.0001430.81.8 m- 4.1 m
2019EH12019-Mar-010.06 | 0.0001630.12.5 m- 5.7 m
2016RN412016-Sep-11 0.06 | 0.00016311.7 m – 3.7 m
2015SK72015-Sep-22 0.07 | 0.0001828.94.4 m- 9.9 m
2016AH1642016-Jan-12 0.07 | 0.0001829.73.1 m- 6.8 m
2013YB2013-Dec-23 0.07 | 0.0001831.51.3 m- 3.0 m
2020 SW2020-Sep-24 0.07 | 0.0001928.94.4 m –  9.9 m
2017WE302017-Nov-260.08 | 0.0002031.91.1 m- 2.5 m
NEO Earth Close Approaches as of 2020-09-21

Background(as of 2020-08-21)

  • Object: 2020 SW
  • Orbit Type: NEO (Apollo)
  • Approximate Diameter: 4.4 m – 9.9 m [14.4357 feet to 32.4803 feet] (Absolute H= 28.9)
  • On the Sentry Risk Table: Yes [archive] [5 Number of Potential Impacts 2093-2118 ]
    • Torino Scale (maximum): 0
    • Palermo Scale (maximum): -9.07
    • Palermo Scale (cumulative): -8.92
    • Diameter: 0.006 km
    • Mass: 2.3e+5 kg
    • Energy:4.5e-3 Mt
    • for more information on risk, pages read Understanding Risk Pages by Jon Giorgini
  • On the NEODyS CLOMON2 risk page: Yes [archive] [12 Number of Potential Impacts 2086-2113 ]
    • Torino Scale (maximum): 0
    • Palermo Scale (maximum): -8.99
    • Palermo Scale (cumulative): –8.37
    • Energy: 7.60e-10 Mt
  • Listed on Near-Earth Object Human Space Flight Accessible Targets Study (NHATS): Yes [archive]
  • Listed on the Goldstone Asteroid Radar Schedule: No
  • Listed on the Arecibo Asteroid Radar Schedule: No
  • Radar Observations: none
  • Discovery observation was made: 2020 09 18.31827 [7:38:18.52] by Mt. Lemmon Survey (MPC Code G96).
  • Last Observation(publish) was made: 2020 09 21.21525 [05:09:57.60] by Mt. Lemmon Station (MPC Code I52)
  • The number of Optical Observations(published):28
  • Oppositions: 1
  • Observation arc: 3 day
  • The number of Observatories Reporting (Published) Observations: 7
  • Observatories Reporting (Published) Observations(MPC Code):
    • (F51) Pan-STARRS 1, Haleakala, Hawaii, USA.
    • (G34) Oberfrauendorf, Germany.
    • (G96) Mt. Lemmon Survey, Arizona, USA.
    • (I52) Steward Observatory, Mt. Lemmon Station, Arizona, USA.
    • (J04) ESA Optical Ground Station, Tenerife, Canary Islands, Spain
    • (L01) Višnjan Observatory, Tičan,Croatia.
    • (V06) Catalina Sky Survey-Kuiper, Arizona, USA.
  • Perihelion Distance: 0.822 AU
  • Aphelion Distance: 1.208 AU
  • Earth MOID: 0.000507161 AU ( 0.197 Lunar Distance) 11.895 Earth radii
  • Close-Approach to Earth: Date and Time(TDB): 2020-Sep-24 11:18
  • Time Uncertainty: ± 00:24 ( 23.5965877046877 minutes)
  • Minimum Distance: 0.000187106487150934 (AU), 0.073 (LD) 4.389 Earth radii, 17,392.635 miles, 27,990.732 KM
  • Nominal Distance(best fit): 0.000187915859624005 (AU), 0.073 (LD), 4.408 Earth radii, 17,467.87 miles, 28,111.812 KM
  • Maximum Distance: 0.000188726786694858 (AU) 0.073 (LD), 4.427 Earth radii, 17,543.251 miles, 28,233.125 KM
  • Was, it Be Visible to the Unaided Eye: NO

Sources

Other Useful Links

The Asteroid 2020 NK1 Has Been Removed From Sentry: Earth Impact Monitoring

Mission Statement

2018 VP1 Information Sheet

A Foofaraw Over a NEO Designated 2018 VP1

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