2022 RM4

2022 RM4
The orbit of 2022 RM4 is highly inclined at 38° and takes 3.8 years to orbit the Sun.
Discovery[1]
Discovered byPan-STARRS 2
Discovery date12 September 2022
Designations
2022 RM4
Orbital characteristics[2]
Epoch 2022-Aug-09 (JD 2459800.5)
Uncertainty parameter 5
Observation arc50 days
Aphelion3.90 AU (Q)
Perihelion0.98844 AU (q)
2.446 AU (a)
Eccentricity0.596 (e)
3.83 years
337.8° (M)
Inclination38.31° (i)
218.2° (Ω)
3 November 2022
181.7° (ω)
Earth MOID0.0032 AU (480 thousand km; 1.2 LD)
Jupiter MOID1.5 AU (220 million km)
Physical characteristics
Dimensions
  • ≈400 m (1,000 ft)[3][a]
  • 290–650 meters[b]
19.8[4]

2022 RM4 is categorized as a potentially hazardous asteroid because it is around 400 meters in diameter[3][a] and makes close approaches to Earth. It was discovered on 12 September 2022 when it was 0.61 AU (91 million km) from Earth and located at declination +65 near the northern circumpolar star Zeta Draconis.[1]

At 1 November 2022 18:26 UT it passed 0.01536 AU (2,298,000 km; 5.98 LD) from Earth.[2] As of 1 November 2022 the uncertainty in the close approach distance was ±77 km.[5] The asteroid should have brighten to about apparent magnitude 14.3 which is roughly the brightness of Pluto and was around 75 degrees from the Sun.[6] It may have been viewable by experienced amateur observers with a telescope that has an aperture of around 8-inches or better.[7]

Earth Approach on 1 November 2022[2]
Date JPL Horizons
nominal geocentric
distance (AU) 		uncertainty
region
(3-sigma)
2022-11-01 18:26 ± 00:01 0.01536 AU (2.298 million km)[2] ±77 km[8]

By 2 November 2022 the asteroid was better placed for the southern hemisphere with a declination of –32.[6] Goldstone Solar System Radar using the Canberra Deep Space Communication Complex 70–meter Deep Space Station 43 and Australia Telescope Compact Array observed the asteroid on 2 November 2022.[9] It then came to perihelion (closest approach to the Sun) on 3 November 2022.[2]

  1. ^ a b Cite error: The named reference MPEC2022-R162 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference jpldata was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference esa was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference MPC-object was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Archive221101 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Mag2022 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Earthsky was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference CA2022 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Goldstone was invoked but never defined (see the help page).


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