2017 SG33
| Discovery[1] | |
|---|---|
| Discovered by | Pan-STARRS |
| Discovery site | Haleakala Obs. |
| Discovery date | 25 September 2017 (first observation only) |
| Designations | |
| 2017 SG33 | |
| Mars crosser[1][2] | |
| Orbital characteristics[2] | |
| Epoch 25 September 2017 (JD 2458021.5) | |
| Uncertainty parameter 9 | |
| Observation arc | 2 days |
| Aphelion | 3.174±0.115 AU |
| Perihelion | 1.322±0.011 AU |
| 2.248±0.081 AU | |
| Eccentricity | 0.4120±0.0165 |
| 3.37±0.18 years | |
| 359.260°±0.686° | |
| 0° 17m 32.712s / day | |
| Inclination | 6.029°±0.200° |
| 187.923°±0.130° | |
| 173.329°±1.838° | |
| Earth MOID | 0.3187 AU (120 LD) |
| Physical characteristics | |
| 23.85±0.14[2][1] | |
2017 SG33 (also written 2017 SG33) is a Mars-crossing asteroid that was previously thought to be a near-Earth object. It was first observed on 25 September 2017, when the asteroid was less than 1 AU from Earth[1] and had a solar elongation of 169°.[5] This asteroid has an observation arc of 2 days and has not been seen since 2017, making it a lost asteroid.
This asteroid was previously in the Risk List and the Priority List of the European Space Agency (ESA) - Space Situational Awareness (SSA).[4] The asteroid was also in the Sentry List of the Jet Propulsion Laboratory (JPL) - Center for Near Earth Object Studies (CNEOS).[6] According to the Sentry List, of the possible close encounters with Earth in the foreseeable future, an encounter on 8 September 2051 had the highest risk of impact.[3] Recalculations of 2017 SG33's orbit from additional observations showed that it does not make any close approaches to Earth, which led to its removal from the Sentry List on 29 July 2021.[7]
See also
[edit]References
[edit]- ^ a b c d "2017 SG33". Minor Planet Center. Retrieved 11 September 2020.
- ^ a b c "JPL Small-Body Database Browser: (2017 SG33)" (2017-09-26 last obs.). Jet Propulsion Laboratory. Retrieved 11 September 2020.
- ^ a b "Sentry: Earth Impact Monitoring - Object Details 2017 SG33". Jet Propulsion Laboratory. Retrieved 6 September 2020.
- ^ a b "ESA space situational awareness 2017SG33". European Space Agency. Retrieved 6 September 2020.
- ^ "JPL HORIZONS Web-Interface (2017 SG33)". Jet Propulsion Laboratory. Retrieved 6 September 2020.
- ^ "Sentry: Earth Impact Monitoring - Impact Risk Data". Jet Propulsion Laboratory. Retrieved 6 September 2020.
- ^ "Sentry: Earth Impact Monitoring – Removed Objects". CNEOS – Center for Near Earth Object Studies. Retrieved 7 February 2025.
External links
[edit]- List Of Amor Minor Planets (by designation), Minor Planet Center
- 2017 SG33 at NeoDyS-2, Near Earth Objects—Dynamic Site
- 2017 SG33 at ESA–space situational awareness
- 2017 SG33 at the JPL Small-Body Database