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

The 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 will be ranks 24th.

Object Close-Approach (CA) Date CA Distance Nominal (LD | au) H (mag) Estimated Diameter
2020QG 2020-Aug-16 0.02 | 6.23e-5 29.9 2.8 m- 6.3 m
2011CQ1 2011-Feb-04 0.03 | 7.92e-5 32.1 1.0 m- 2.3 m
2019UN13 2019-Oct-31 0.03 | 8.43e-5 32 1.1 m- 2.4 m
2008TS26 2008-Oct-09 0.03 | 8.44e-5 33.2 0.61 m – 1.4 m
2004FU162 2004-Mar-31 0.03 | 8.63e-5 28.7 4.8 m- 11 m
2020CD3 2019-Apr-04 0.03 | 8.77e-5 31.7 1.2 m-2.8 m
2020JJ 2020-May-04  0.03 | 8.96e-5 30 2.7 m – 6.0 m
2018UA 2018-Oct-19  0.04 | 9.14e-5 30.2 2.4 m- 5.4 m
2016DY30 2016-Feb-25  0.04 | 9.56e-5 30.5 2.1 m- 4.7 m
2019AS5 2019-Jan-08  0.04 | 0.00010 32.3 0.92 m- 2.1 m
2020CW 2020-Feb-01  0.04 | 0.00011 32.5 0.83 m- 1.9 m
2017GM 2017-Apr-04  0.04 | 0.00011 29.9 2.8 m- 6.2 m
2017UJ2 2017-Oct-20  0.05 | 0.00012 30.9 1.8 m – 3.9 m
2011MD 2011-Jun-27  0.05 | 0.00012 28 6.7 m –   15 m
2014LY21 2014-Jun-03  0.05 | 0.00013 29.1 4.0 m –  9.0 m
2009VA 2009-Nov-06  0.05 | 0.00014 28.6 5.1 m – 11 m
2012 KT42 2012-May-29  0.05 | 0.00014 29 4.2 m –  9.4 m
2017EA 2017-Mar-02 0.05 | 0.00014 30.8 1.8 m- 4.1 m
2019EH1 2019-Mar-01 0.06 | 0.00016 30.1 2.5 m- 5.7 m
2016RN41 2016-Sep-11  0.06 | 0.00016 31 1.7 m – 3.7 m
2015SK7 2015-Sep-22  0.07 | 0.00018 28.9 4.4 m- 9.9 m
2016AH164 2016-Jan-12  0.07 | 0.00018 29.7 3.1 m- 6.8 m
2013YB 2013-Dec-23  0.07 | 0.00018 31.5 1.3 m- 3.0 m
2020 SW 2020-Sep-24  0.07 | 0.00019 28.9 4.4 m –  9.9 m
2017WE30 2017-Nov-26 0.08 | 0.00020 31.9 1.1 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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