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2022 UR4

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This is an old revision of this page, as edited by Simeon (talk | contribs) at 15:58, 1 January 2023 (Adding short description: "Small near-Earth asteroid"). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

2022 UR4
Discovery[1][2]
Discovered byATLAS-MLO
Discovery siteMauna Loa Obs.
Discovery date26 November 2022
Designations
2022 WM7
A10OBKV[3]
NEO · Apollo[1]
Orbital characteristics[4]
Epoch 25 February 2023 (JD 2460000.5)
Uncertainty parameter 6
Observation arc13.56 hours[1]
Aphelion2.701 AU
Perihelion0.831 AU
1.766 AU
Eccentricity0.5294
2.35 yr (857.0 days)
36.030°
0° 25m 12.279s / day
Inclination11.292°
207.182°
December 2022[4]
238.577°
Earth MOID0.000407 AU (60,900 km; 0.158 LD)
Jupiter MOID2.641 AU
Physical characteristics
4.4–9.9 m (assumed albedo 0.05–0.25)[5]
28.90±0.45[4]

2022 UR4 is a small near-Earth asteroid that made an extremely close approach within 0.044 lunar distances (17,000 km; 11,000 mi) from Earth's center on 20 October 2022 at 22:45 UTC.[4] It was discovered about 14 hours before closest approach by the Asteroid Terrestrial-impact Last Alert System (ATLAS) survey telescope at Mauna Loa Observatory, Hawaii on 20 November 2022.[2] During the close approach, the asteroid passed above the northern hemisphere of Earth and reached a peak brightness of magnitude 10,[2] just 40 times fainter than the threshold of naked eye visibility.[a]

Notes

  1. ^ The faintest magnitude that can be seen with the naked eye is about 6.[6] Using the formula Δm = −2.5 log10(F1/F2),[6] where Δm = m1 – m2 = 6 – 10 = –4 is the magnitude difference between the naked eye limit and 2022 UR4's peak brightness, the brightness ratio F1/F2 of the naked eye limit to the peak brightness of 2022 UR4 is approximately 39.81 ≈ F1/F2 = 10(Δm/–2.5).

References

  1. ^ a b c "2022 UR4". Minor Planet Center. Retrieved 30 November 2022.
  2. ^ a b c "MPEC 2022-U145 : 2022 UR4". Minor Planet Electronic Circular. Minor Planet Center. 21 October 2022. Retrieved 30 November 2022.
  3. ^ "2022 UR4". NEO Exchange. Las Cumbres Observatory. 20 October 2022. Retrieved 30 November 2022.
  4. ^ a b c d "JPL Small-Body Database Browser: (2022 UR4)" (2022-10-20 last obs.). Jet Propulsion Laboratory. Retrieved 30 November 2022.
  5. ^ "Asteroid Size Estimator". Center for Near Earth Object Studies. NASA. Retrieved 30 November 2022.
  6. ^ a b Mihos, Chris (2005). "The Magnitude Scale". Case Western Reserve University. Retrieved 30 November 2022.
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