2019 TF7
| Discovery [1] | |
|---|---|
| Discovery date | 7 October 2019[2] |
| Designations | |
| 2019 TF7 | |
| Amor · NEO | |
| Orbital characteristics [3] | |
| Epoch 9 October 2019 (JD 2458765.5) | |
| Uncertainty parameter 7 | |
| Observation arc | 23 days |
| Aphelion | 4.23 AU |
| Perihelion | 1.14 AU |
| 2.69 AU | |
| Eccentricity | 0.574 |
| 4.41 yr (1611 d) | |
| 24.9° | |
| 0° 16m 23.88s / day | |
| Inclination | 22.2° |
| 280.5° | |
| 53.9° | |
| Earth MOID | 0.24 AU (93 LD) |
| Mars MOID | 0.05 AU (19 LD)[1] |
| Physical characteristics | |
Mean diameter | ~800 meters[4] |
| 17.8[3] | |
2019 TF7 is an asteroid from the inner regions of the asteroid belt, approximately 800 meters (0.50 miles) in diameter. It was discovered on 7 October 2019 and with the orbital uncertainty still high after 4 days of observation, it had the rare chance of impacting Earth in less than 2 years on 26 June 2021.[5][4] The line of variation (LOV) was 730 million km long and overlapped Earth's position. It was listed at the top of the European Space Agency risk list due to its large size and near-term threat. Precovery images from 18 September 2019 were located, extending the observation arc to 23 days, and the object was removed from the Sentry Risk Table. On 26 June 2021 the asteroid will be 4.9 AU (730 million km) from Earth.
| Date | Impact probability (1 in) |
JPL Horizons nominal geocentric distance (AU) |
uncertainty region |
|---|---|---|---|
| 2021-06-26[5][4] | 67 million | 4.1 AU (610 million km) | ±730 million km |
Orbit and classification[edit]
It is a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt.[6][7] It orbits the Sun in the inner main-belt at a distance of 1.1–3.6 AU once every 3 years and 7 months (1,317 days; semi-major axis of 2.35 AU). Its orbit has an eccentricity of 0.53 and an inclination of 22° with respect to the ecliptic.[3]
Notes[edit]
References[edit]
- ^ a b "2019 TF7". Minor Planet Center. Retrieved 14 October 2019.
- ^ "MPEC 2019-T215 : 2019 TF7". IAU Minor Planet Center. 2019-10-11. Retrieved 2019-08-15. (K19T07F)
- ^ a b c "JPL Small-Body Database Browser: (2019 TF7)" (2019-10-11 last obs.). Jet Propulsion Laboratory. Retrieved 14 October 2019.
- ^ a b c Archive.is of Sentry
- ^ a b Wayback Machine: esa Risk List for 2019-10-13
- ^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. S2CID 119280014.
- ^ "Asteroid 2019 TF7". Small Bodies Data Ferret. Retrieved 14 October 2019.
External links[edit]
- Asteroid Lightcurve Database (LCDB), query form (info Archived 2017-12-16 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 2019 TF7 at AstDyS-2, Asteroids—Dynamic Site
- 2019 TF7 at the JPL Small-Body Database