| Discovery[1] | |
|---|---|
| Discovered by | Naef et al. |
| Discovery site | La Silla Observatory |
| Discovery date | October 19, 2009 |
| radial velocity (HARPS) | |
| Orbital characteristics[2] | |
| Apastron | 4.78 AU |
| Periastron | 0.12 AU |
| 2.45+0.03 −0.04 AU | |
| Eccentricity | 0.95+0.03 −0.04 |
| 1,333±4 d 3.65±0.01 yr | |
| Inclination | 21°+38° −11° or 162°+7° −27° |
| 248°+53° −33° or 163°+38° −36° | |
| 2,454,246+9 −10 JD | |
| 289°+20° −18° | |
| Semi-amplitude | 37.3+5.1 −0.9 m/s[1] |
| Star | HD 28254 |
| Physical characteristics | |
| Mass | 3.8+3.0 −2.2 MJ[2] |
| Temperature | 207+13 −40 K[citation needed] |
HD 28254 b (also known as HIP 20606 b) is an exoplanet which orbits the G-type main sequence star HD 28254, located 180 light-years away in the constellation Dorado.
Discovery
[edit]The planet was discovered in a survey by HARPS along with 29 other planets in 2009.[1]
Properties
[edit]Due to the planet's high mass, it is assumed to be a gas giant like Jupiter. Since HD 28254 b was detected indirectly, properties such as its inclination, radius, and temperature are unknown. HD 28254 takes about 3 years to orbit its host and has one of the most eccentric orbits around a star. In 2023, the inclination and true mass of HD 28254 b were measured via astrometry, though the mass remains uncertain - it is between about 1.6 and 6.8 times the mass of Jupiter.[2]
References
[edit]- ^ a b c Naef, Dominique; Mayor, Michel; Lo Curto, Gaspare; Bouchy, François; Lovis, Christophe; Moutou, Claire; Benz, Willy; Pepe, Francesco; Queloz, Didier; Santos, Nuno C.; Ségransan, Damien; Udry, Stéphane; Bonfils, Xavier; Delfosse, Xavier; Forveille, Thierry; Hébrard, Guillaume; Mordasini, Christoph; Perrier, Christian; Boisse, Isabelle; Sosnowska, Danuta (2010). "The HARPS Search for Southern Extrasolar Planets XXIII. 8 Planetary Companions to Low-activity Solar-type Stars". Astronomy and Astrophysics. 523: A15. arXiv:1008.4600. Bibcode:2010A&A...523A..15N. doi:10.1051/0004-6361/200913616. S2CID 118845989.
- ^ a b c Philipot, F.; Lagrange, A.-M.; et al. (October 2023). "A multi-technique approach to identifying and/or constraining radial-velocity substellar companions". Astronomy & Astrophysics. 678: A107. arXiv:2308.05417. Bibcode:2023A&A...678A.107P. doi:10.1051/0004-6361/202346612. S2CID 260775968.
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