astro.wikisort.org - Asteroid

2009 JF₁ is a small near-Earth object that passed within 0.3 AU (45 million km) of Earth in 2022.[5] On 5 February 2022 the 2009 observations were remeasured greatly reducing the odds of an impact. On 6 May 2022 it had a 1-in-140,000 chance of impacting Earth.[2] It is estimated to be 10-meters in diameter which would make it smaller than the Chelyabinsk meteor. It has a very short observation arc of 1.2 days and has not been observed since 2009. On 6 May 2022 it was nominally expected to be 0.2 AU (30 million km) from Earth but has an uncertainty region of ±23 million km (0.15 AU).[5] The nominal Earth approach was 15 May 2022 and would have had the asteroid only brightening to apparent magnitude 26.[6][7] With a Palermo scale rating of -4.41,[2] the odds of impact were 26000 times less than the background hazard level for an asteroid of this size.

Virtual impactor[2]

Date	Impact probability (1 in)	JPL Horizons nominal geocentric distance (AU)	NEODyS nominal geocentric distance (AU)	MPC[8] nominal geocentric distance (AU)	Find_Orb nominal geocentric distance (AU)	uncertainty region (3-sigma)
2022-05-06	140000	0.19 AU (28 million km)[5]	0.16 AU (24 million km)[7]	0.19 AU (28 million km)	0.19 AU (28 million km)[9]	± 23 million km[5]

2009 JF₁

Discovery[1]
Discovered by	Mount Lemmon Survey
Discovery date	4 May 2009
Designations
MPC designation	2009 JF1
Minor planet category	NEO Apollo risk listed[2]
Orbital characteristics[3]
Epoch 2022-Jan-21 (JD 2459600.5)
Uncertainty parameter 7
Observation arc	1.2 days[2]
Aphelion	3.29 AU (Q)
Perihelion	0.4953 AU (q)
Semi-major axis	1.89 AU (a)
Eccentricity	0.738 (e)
Orbital period (sidereal)	2.6 years
Mean anomaly	300°±3° (M)
Inclination	6.16° (i)
Longitude of ascending node	45.5° (Ω)
Time of perihelion	2022-Jul-02 ± 3 days
Argument of perihelion	281° (ω)
Earth MOID	0.000055 AU (8,200 km)
Jupiter MOID	2.1 AU (310,000,000 km)
Physical characteristics
Dimensions	~10 m (33 ft)[2] 8–17 meters
Absolute magnitude (H)	27.7[3][4]

About two months after approaching Earth, it will come to perihelion (closest approach to the Sun), but the time of perihelion passage is only known with an accuracy of ±3 days.[3]

See also

• 2006 QV89
• 2018 VP1

References

External links

• 2009 JF1 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• 2009 JF1 at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical Properties · Summary
• 2009 JF1 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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