2018 LF16
 The best inclined orbit is currently completely outside Earth's orbit, with markers every 30 days of motion. | |
| Discovery [1] | |
|---|---|
| Discovered by | Pan-STARRS 1 |
| Discovery site | Haleakala Obs. |
| Discovery date | 14 June 2018 |
| Designations | |
| 2018 LF16 | |
| Mars crossing asteroid [1][2] | |
| Orbital characteristics [2] | |
| Epoch 15 June 2018 (JD 2458284.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 15 years |
| Aphelion | 1.968 AU (on 2023-Sep-16) |
| Perihelion | 1.5673 AU |
| 1.7679 AU | |
| Eccentricity | 0.11347 |
| 2.35 yr (622 d) | |
| 10.87° | |
| 0° 22m 24.96s / day | |
| Inclination | 21.903° |
| 210.28° | |
| 2022-Jul-14[2] | |
| 306.89° | |
| Earth MOID | 0.61 AU (91 million km)[2] |
| Physical characteristics | |
| 213 m[3] 400 m[4] 300-670 meters | |
| 19.75[1][2][4] | |
2018 LF16 is a small Mars crossing asteroid roughly 213 m (699 ft) in diameter. It was first observed by astronomers with the Pan-STARRS survey at Haleakala Observatory on 14 June 2018. It was removed from the Sentry Risk Table on 29 July 2021. With an observation arc of 15 years the orbit is very well known and it does not make any notable approaches to Earth.[2]
In November 2018, when the asteroid had an almost worthless observation arc of 1.8 days, news article headlines exaggerated[5] claims of 62 potentially dangerous Earth-orbit crossings in the next century but also reported NASA calculations indicating there was only a 1 in 30,000,000 chance of impact.[6] Additionally, 2018 LF16 was rated at 0 on the Torino Scale, meaning that the chance of impact was so low as to effectively be zero. The observation arc extended only 1.8 days,[3] leaving large uncertainties in its predicted motion,[7][8] causing 2018 LF16 to be considered a lost asteroid.[9]
| Date | JPL Horizons nominal geocentric distance (AU) |
uncertainty region (3-sigma) |
|---|---|---|
| 2023-08-07 | 1.09977 AU (164.523 million km)[10] | ± 142 km[10] |
With an observation arc of 15 years, it is known that its orbit leaves it entirely outside of Earth's orbit, never coming closer than 0.61 AU (91 million km) to Earth (MOID).[2] On 7 August 2023 the asteroid will be roughly 1.1 AU (160 million km) from Earth with an uncertainty region of ±142 km.[10] It will reach aphelion (farthest point from the Sun) on 16 September 2023. It will pass 0.080 AU (12.0 million km) from Mars on 6 July 2027.[2]
References
[edit]- ^ a b c "2018 LF16". Minor Planet Center. Retrieved 7 January 2019.
- ^ a b c d e f g h "JPL Small-Body Database Browser: (2018 LF16)" (2021-11-26 last obs.). Jet Propulsion Laboratory. Archived from the original on 23 July 2022. Retrieved 7 January 2019.
- ^ a b "Sentry: Earth Impact Monitoring - Object Details 2018 LF16". Jet Propulsion Laboratory. Retrieved 6 August 2020.
- ^ a b "ESA space situational awareness 2018LF16". European Space Agency. Retrieved 6 August 2020.
- ^ Wehner, Mike (26 November 2018). "No, asteroid 2018 LF16 probably isn't going to hit the Earth". Boy Genius Report.
- ^ Kettley, Sebastian (25 November 2018). "NASA asteroid WARNING: 700-foot-wide space rock on 62 RISK trajectories with Earth by 2023". Express.co.uk. Retrieved 26 November 2018.
- ^ "MPC Ephemerides for Visible Risk-Listed Objects". www.hohmanntransfer.com. Archived from the original on 26 November 2018. Retrieved 26 November 2018.
- ^ Chamberlin, Alan. "JPL Small-Body Database Browser". ssd.jpl.nasa.gov. Retrieved 26 November 2018.
- ^ "NEODyS-2 - Near Earth Objects - Dynamic Site - Risk List". SpaceDys. Archived from the original on 19 April 2021. Retrieved 6 August 2020.
- ^ a b c "Horizons Batch for 2023-08-07". JPL Horizons. Retrieved 21 July 2022. (Obsolete Impactor Table)
External links
[edit]- 2018 LF16 at NeoDyS-2, Near Earth Objects—Dynamic Site
- 2018 LF16 at ESA–space situational awareness
- 2018 LF16 at the JPL Small-Body Database
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