| Discovery | |
|---|---|
| Discovered by | Grigory Neujmin |
| Discovery date | 24 February 1916 |
| Orbital characteristics | |
| Epoch | 31 December 1926 |
| Aphelion | 4.84 AU |
| Perihelion | 1.338 AU |
| Semi-major axis | 3.089 AU |
| Eccentricity | 0.567 |
| Orbital period | 5.43 yr |
| Inclination | 10.638° |
| Last perihelion | 18 August 2019[1] (unobserved) |
| Next perihelion | 11 May 2025[1] (Lost since 1927) |
25D/Neujmin, otherwise known as Comet Neujmin 2, is a periodic comet in the Solar System discovered by Grigory N. Neujmin (Simeis) on February 24, 1916.[2] It was last observed on February 10, 1927.[3]
It was confirmed by George Van Biesbroeck (Yerkes Observatory, Wisconsin, United States) and Frank Watson Dyson (Greenwich Observatory, England) on March 1.[2]
A prediction by Andrew Crommelin (Royal Observatory, Greenwich, England) for 1921 was considered unfavourable and no observations were made. The comet was recovered in 1926.[3] Searches in 1932 and 1937 were unsuccessful.[2]
Consequently, this comet has remained a lost comet since 1927. As of 2019[update] and using the JPL Horizons nominal orbit, the comet is still expected to come to perihelion around 1.3 AU from the Sun.
References
[edit]- ^ a b Seiichi Yoshida. "25D/Neujmin 2". Seiichi Yoshida's Comet Catalog. Retrieved 2019-02-26.
- ^ a b c Kronk, Gary W. "25D/Neujmin 2". Retrieved 2018-02-26. (Cometography Home Page)
- ^ a b "25D/Neujmin Orbit". Minor Planet Center. Retrieved 2019-02-26.
External links
[edit]- Orbital simulation from JPL (Java) / Horizons Ephemeris
- 25D at Kronk's Cometography
- 25D at Kazuo Kinoshita's Comets
- 25D at Seiichi Yoshida's Comet Catalog
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