2009 JF1
| Discovery[1] | |
|---|---|
| Discovered by | Mount Lemmon Survey |
| Discovery date | 4 May 2009 |
| Designations | |
| 2009 JF1 | |
| 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) |
| 1.89 AU (a) | |
| Eccentricity | 0.738 (e) |
| 2.6 years | |
| 300°±3° (M) | |
| Inclination | 6.16° (i) |
| 45.5° (Ω) | |
| 2022-Jul-02 ± 3 days | |
| 281° (ω) | |
| Earth MOID | 0.000055 AU (8,200 km) |
| Jupiter MOID | 2.1 AU (310,000,000 km) |
| Physical characteristics | |
| Dimensions |
|
| 27.7[3][4] | |
2009 JF1 is a small near-Earth object that should have 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 5 January 2024 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 5 January 2024 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 14 January 2024 and would have had the asteroid only brightening to apparent magnitude 26 which would have made it too faint for automated surveys to detect.[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] |
About two months after approaching Earth, it came to perihelion (closest approach to the Sun), but the time of perihelion passage is only known with an accuracy of ±3 days.[3] The asteroid was not recovered due to its small size and distance from Earth.
See also
[edit]References
[edit]- ^ "MPEC 2009-J26 : 2009 JF1". IAU Minor Planet Center. 5 May 2009. Retrieved 13 October 2021. (K09J01F)
- ^ a b c d e f "Earth Impact Risk Summary: 2009 JF1". NASA/JPL Near-Earth Object Program Office. Archived from the original on 14 December 2016. Retrieved 13 October 2021. (Wayback Machine 2009)
- ^ a b c "JPL Small-Body Database Browser: (2009 JF1)" (last observation: 2009-05-05; arc: 1 day). Jet Propulsion Laboratory. Archived from the original on 28 May 2019. Retrieved 13 October 2021.
- ^ "2009 JF1 Orbit". Minor Planet Center. Retrieved 13 October 2021.
- ^ a b c d "Horizons Batch for 2022-05-06 Virtual Impactor". JPL Horizons. Archived from the original on 13 October 2021. Retrieved 13 October 2021. RNG_3sigma = uncertainty range in km. (JPL#7/Soln.date: 2021-Apr-15 generates RNG_3sigma = 62906567 km for 2022-May-06.)
- ^ "Horizons Batch for 2022-05-10 NOMINAL". JPL Horizons. Archived from the original on 27 December 2021. Retrieved 27 December 2021.
- ^ a b "2009JF1 Ephemerides for 6 May 2022". NEODyS (Near Earth Objects – Dynamic Site). Archived from the original on 13 October 2021. Retrieved 13 October 2021.
- ^ "MPC Ephemeris Service". IAU Minor Planet Center. Retrieved 13 October 2021.
- ^ "Find_Orb for 2022-05-06". Project Pluto. Archived from the original on 13 October 2021. Retrieved 13 October 2021.
External links
[edit]- 2009 JF1 at NeoDyS-2, Near Earth Objects—Dynamic Site
- 2009 JF1 at ESA–space situational awareness
- 2009 JF1 at the JPL Small-Body Database
