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.
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] |
Discovery[1] | |
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Discovered by | Mount Lemmon Survey |
Discovery date | 4 May 2009 |
Designations | |
MPC designation | 2009 JF1 |
Minor planet category |
|
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 |
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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]
Small Solar System bodies | |||||||
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Minor planets |
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Comets |
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Other |
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