 Comet 31P/Schwassmann-Wachmann observed on February 14, 2011 | |
| Discovery | |
|---|---|
| Discovered by | Arnold Schwassmann Arno Arthur Wachmann |
| Discovery date | January 17, 1929 |
| Designations | |
| 1929 I; 1935 III; 1942 I; 1948 VII; 1955 I; 1961 VII; 1968 II; 1974 XIII; 1981 VI; 1987 XIX; 1994 II | |
| Orbital characteristics | |
| Epoch | March 6, 2006 |
| Aphelion | 5.048 AU |
| Perihelion | 3.416 AU |
| Semi-major axis | 4.232 AU |
| Eccentricity | 0.1928 |
| Orbital period | 8.705 a |
| Inclination | 4.5487° |
| Last perihelion | July 6, 2019 September 29, 2010[1] January 18, 2002[1] |
| Next perihelion | 2028-03-19[2] |
31P/Schwassmann–Wachmann, also known as Schwassmann–Wachmann 2, is a periodic comet in the Solar System. It was discovered on January 17, 1929, at an apparent magnitude of 11.[3] The comet has been seen at every apparition.
The comet nucleus is estimated to be 6.2 kilometers in diameter.[4] In 1929, the astronomer Anne Sewell Young identified the comet with an object that had been misidentified as the minor planet "Adelaide" (A904 EB).[5]
References
[edit]- ^ a b Seiichi Yoshida (2008-10-26). "31P/Schwassmann-Wachmann 2". Seiichi Yoshida's Comet Catalog. Retrieved 2010-01-24.
- ^ "31P/Schwassmann-Wachmann Orbit". Minor Planet Center. Retrieved 2020-06-29.
- ^ Kronk, Gary W. "31P/Schwassmann–Wachmann 2". Retrieved 2010-01-24. (Cometography Home Page)
- ^ "JPL Small-Body Database Browser: 31P/Schwassmann–Wachmann 2" (2010-01-21 last obs). Jet Propulsion Laboratory. Retrieved 2010-02-26.
- ^ "Long 'Lost' Planet Found Masquerading as Comet". Oakland Tribune. June 21, 1929. p. 31. Retrieved November 9, 2017 – via Newspapers.com.
External links
[edit]- Orbital simulation from JPL (Java) / Horizons Ephemeris
- 31P at Kazuo Kinoshita's Comets
- 31P/Schwassmann-Wachmann 2 – Seiichi Yoshida @ aerith.net
| National | |
|---|---|
| Other | |
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction