322P/SOHO
Discovery | |
---|---|
AU | |
Eccentricity | 0.9798 |
Orbital period | 3.97 yr |
Max. orbital speed | 187 km/s (2023)[2] |
Min. orbital speed | 1.9 km/s (2017-Sep-01) |
Inclination | 11.46° |
Last perihelion | August 31, 2019[1] September 4, 2015[1] September 7, 2011[1] September 11, 2007[1] |
Next perihelion | August 21, 2023[2] |
TJupiter | 2.347 |
Earth MOID | 0.092 AU (13,800,000 km) |
Physical characteristics | |
Dimensions | ~100-200 m |
Comet total magnitude (M1) | 19.00 ± 0.09 |
Perihelion distance at different epochs[3] | |||||||
Perihelion date |
Perihelion )
(AU | ||||||
---|---|---|---|---|---|---|---|
1955-04-18 | 0.0651 | ||||||
1983-08-08 | 0.0597 | ||||||
1999-09-05 | 0.0563 | ||||||
2015-09-04 | 0.0535 | ||||||
2019-08-31 | 0.0506 | ||||||
2023-08-21 | 0.0501 | ||||||
2027-08-11 | 0.0505 | ||||||
2031-08-01 | 0.0479 | ||||||
2047-05-23 | 0.0451 |
Comet 322P/SOHO, also designated P/1999 R1, P/2003 R5, P/2007 R5, and P/2011 R4, is the first
The periodicity of this comet was predicted by
As it passed to within 7.9 million kilometres of the Sun, around 0.05 AU, it brightened by a factor of around a million. This is common behavior for a comet.[6]
P/2007 R5 is probably an
It was expected to return in September 2011,[6] and was recovered by B. Zhou on September 6, 2011. It has a 2.8 hour light curve period suggesting its rotation. It is uncertain whether to classify it as a dead comet or asteroid.[7]
Discovery credit goes to Terry Lovejoy (Australia, 1999), Kazimieras Černis (Lithuania, 2003), and Bo Zhou (China, 2007).
The second periodic comet discovered by SOHO is
It was observed again in September 2019.[9] On April 11, 1947 it passed about 7.1 ± 0.22 million km (4.4 ± 0.14 million mi) from Earth.[10][11]
References
- ^ a b c d e "322P/SOHO Orbit". Minor Planet Center. Retrieved April 10, 2017.
- ^ a b c "Horizons Batch for 322P/SOHO on 2023-Aug-21" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Archived from the original on June 24, 2023. Retrieved August 12, 2023. (JPL#10/Soln.date: 2016-Oct-27)
- ^ Kinoshita, Kazuo (June 9, 2015). "322P/SOHO past, present and future orbital elements". Comet Orbit. Retrieved August 16, 2023.
- ^ Jaggard, Victoria (September 25, 2007). "Photo in the News: Sun Probe Spies New Periodic Comet". National Geographic News. National Geographic Society. Archived from the original on October 11, 2007. Retrieved September 25, 2007.
- ^ Marsden, Brian (September 18, 2007), "MPEC 2007-S16 : COMET P/1999 R1 = 2003 R5 = 2007 R5 (SOHO)", Minor Planet Electronic Circular (2007-S16)
- ^ a b c "SOHO's new catch: its first officially periodic comet". European Space Agency. September 25, 2007. Retrieved November 19, 2007.
- ^ Rainer Kracht (September 7, 2011). "Recent comet discoveries 2123-2137". Yahoo Groups: SOHO Hunter. Archived from the original on January 5, 2013. Retrieved September 11, 2011.
- ^ Karl Battams (January 30, 2012). "The tale of a very shy comet..." Sungrazing Comets @ Navy.mil. Retrieved January 30, 2012.
- ^ The case of the Sun-diving asteroid that thinks it's a comet Phil Plait, September 4, 2019
- ^ "JPL Small-Body Database Browser: 322P/SOHO" (last observation used: 2015-08-08). Jet Propulsion Laboratory. Retrieved August 16, 2023.
- ^ "Horizons Batch for 1947-Apr-11 Earth approach uncertainty". JPL Horizons. Retrieved August 16, 2023. RNG_3sigma = uncertainty range in km. (JPL#10/Soln.date: 2016-Oct-27)
External links
- Orbital simulation from JPL (Java) / Ephemeris
- SOHO's first officially periodic comet
- SOHO Comets Archived May 25, 2015, at the Wayback Machine (view real-time images)