238P/Read
Perihelion 2.3647 AU (q) | | ||||||||
| 3.1646 AU (a) | |||||||||
| Eccentricity | 0.25277 | ||||||||
| 5.63 yr | |||||||||
| 28.566° (M) | |||||||||
| Inclination | 1.2662° | ||||||||
| 51.647° | |||||||||
| 2028-Jan-24[4] 2022-Jun-05 (previous)[5] | |||||||||
| 325.76° | |||||||||
| TJupiter | 3.153 | ||||||||
| Physical characteristics | |||||||||
Mean diameter | 0.6 km (approx.)[6] | ||||||||
Mean density | 1.0 g/cm3 (assumed)[6] | ||||||||
| Albedo | 0.04 (assumed)[6] | ||||||||
| |||||||||
| 19.62 to 23.41 | |||||||||
| 20.1±0.4R[6] | |||||||||
238P/Read (P/2005 U1) is a
Description
Before it was discovered 238P came to
Observations of 238P when it was inactive in 2007 suggests that it has a small nucleus only about 0.6 km in diameter.[6]
It came to perihelion on 2011 March 10,[6] 2016 October 22.[7][5] and 2022 June 5.[5] It will next come to perihelion on 2028 January 24.[4]
238P/Read was the target of a mission proposal in NASA's Discovery Program in the 2010s called Proteus, however it was not selected for further development.[8] Discovery program's founding mission was to an asteroid, but it went to a Near-Earth asteroid.[9] A mission to a main-belt asteroid was proposed in the 1990s (also see Deep Impact (spacecraft)).[10]
The comet was observed by James Webb Space Telescope during the 2022 perihelion and it was found spectrographicaly that its coma was composed by water vapor, due to water sublimation, and lacked significant CO2 coma.[11]
See also
References
- ^ a b Henry H. Hsieh (May 2010). "Main Belt Comets". Hawaii. Archived from the original on 2011-08-06. Retrieved 2010-12-15. (older 2010 site) Archived August 10, 2009, at the Wayback Machine
- ^ a b David Jewitt. "Main Belt Comets". UCLA, Department of Earth and Space Sciences. Retrieved 2010-12-15.
- ^ a b c d "JPL Small-Body Database Browser: 238P/Read (2005 U1)" (last observation: 2011-09-14). Archived from the original on 2020-07-26. Retrieved 2012-08-08.
- ^ a b "Horizons Batch for 238P/Read on 2028-Jan-24" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 2023-04-30. (JPL#37/Soln.date: 2023-Jan-03)
- ^ a b c "238P/Read Orbit". Minor Planet Center. Retrieved 2014-06-20.
- ^ .
- Syuichi Nakano (2010-08-20). "P/Read (2005 U1 = 2010 N2)". OAA Computing and Minor Planet Sections. Retrieved 2011-07-25.
- ^ "PROTEUS – A MISSION TO INVESTIGATE THE ORIGIN OF EARTH'S WATER: CREATING HABITABLE WORLDS" (PDF). Astrobiology Science Conference 2015. Retrieved January 11, 2016.
- ^ "Technical Digest" (PDF). Archived from the original (PDF) on 2018-02-26. Retrieved 2017-01-05.
- ^ Discover 95 : MISSIONS TO THE MOON, SUN, VENUS AND A COMET PICKED FOR DISCOVERY - NASA
- PMC 10371862.
External links
- Orbital simulation from JPL (Java) / Horizons Ephemeris
- Elements and Ephemeris for 238P/Read – Minor Planet Center
- 238P/Read at the Minor Planet Center's Database
- Main-Belt Comet 238P/Read Revisited (arXiv:1106.0045 : 31 May 2011)
.png)
