| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Dorado |
| Right ascension | 06h 06m 09.38154s[1] |
| Declination | −66° 02′ 22.6304″[1] |
| Apparent magnitude (V) | 5.72[2] |
| Characteristics | |
| Spectral type | A0V[3] |
| U−B color index | −0.024±0.004[2] |
| B−V color index | −0.03[4] |
| Astrometry | |
| Radial velocity (Rv) | +17.6±4.3[2] km/s |
| Proper motion (μ) | RA: +13.656[1] mas/yr Dec.: +27.815[1] mas/yr |
| Parallax (π) | 9.7251 ± 0.1094 mas[1] |
| Distance | 335 ± 4 ly (103 ± 1 pc) |
| Absolute magnitude (MV) | +0.75[2] |
| Details | |
| Mass | 2.46[5] M☉ |
| Luminosity | 49[6] L☉ |
| Surface gravity (log g) | 4.09±0.08[7] cgs |
| Temperature | 10,325±240[7] K |
| Rotational velocity (v sin i) | 149[5] km/s |
| Age | 94[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Eta1 Doradus, Latinized from η1 Doradus, is a star in the southern constellation of Dorado. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.72.[2] This object is located approximately 335 light years distant from the Sun, based on parallax, and is drifting further away with a radial velocity of +18 km/s.[2] It is circumpolar south of latitude 24°S.
This object is an A-type main-sequence star with a stellar classification of A0V.[3] It is 94[5] million years old with a high rotation rate, showing a projected rotational velocity of 149.[5] The star has 2.46[5] times the mass of the Sun and is radiating 49[6] times the Sun's luminosity from its photosphere at an effective temperature of 10,325 K.[7] It is the southern pole star of Venus.[9]
References
[edit]- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
- ^ HR 2194, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 25, 2008.
- ^ a b c d e f David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
{{citation}}: CS1 maint: unflagged free DOI (link) - ^ a b c Decin, L.; et al. (September 2004), "MARCS: Model Stellar Atmospheres and Their Application to the Photometric Calibration of the Spitzer Space Telescope Infrared Spectrograph (IRS)", Astrophysical Journal Supplement, 154 (1): 408–412, arXiv:astro-ph/0406104, Bibcode:2004ApJS..154..408D, doi:10.1086/422884. See Table 1.
- ^ "HD 42525". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 25, 2008.
- ^ Archinal, Brent A.; A'Hearn, Michael F.; Bowell, Edward G.; Conrad, Albert R.; Consolmagno, Guy J.; et al. (2010). "Report of the IAU Working Group on Cartographic Coordinates and Rotational Elements: 2009" (PDF). Celestial Mechanics and Dynamical Astronomy. 109 (2): 101–135. Bibcode:2011CeMDA.109..101A. doi:10.1007/s10569-010-9320-4. S2CID 189842666. Archived from the original (PDF) on 2016-03-04. Retrieved 2018-09-06.
External links
[edit]- 2004. Starry Night Pro, Version 5.8.4. Imaginova. ISBN 978-0-07-333666-4. www.starrynight.com
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