| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 19m 45.23505s[1] |
| Declination | +16° 18′ 24.9955″[1] |
| Apparent magnitude (V) | 4.84[2] |
| Characteristics | |
| Spectral type | K3 III[3] |
| B−V color index | 1.228±0.001[2] |
| Astrometry | |
| Radial velocity (Rv) | −8.25±0.43[2] km/s |
| Proper motion (μ) | RA: –141.521[1] mas/yr Dec.: +60.274[1] mas/yr |
| Parallax (π) | 17.8379 ± 0.1894 mas[1] |
| Distance | 183 ± 2 ly (56.1 ± 0.6 pc) |
| Absolute magnitude (MV) | 1.01±0.09[4] |
| Details[4] | |
| Mass | 1.14±0.19 M☉ |
| Radius | 12.18+0.26 −0.36[1] R☉ |
| Luminosity | 51.99±0.66[1] L☉ |
| Surface gravity (log g) | 2.36±0.08 cgs |
| Temperature | 4,472 K |
| Metallicity [Fe/H] | 0.16 dex |
| Rotation | 848 days[5] |
| Rotational velocity (v sin i) | 1.0[5] km/s |
| Age | 5.21±2.28 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
20 Boötis is a single[7] star in the northern constellation of Boötes, located 183 light years away from the Sun. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.84.[2] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.154 arc seconds per annum.[8] It is moving closer to the Earth with a heliocentric radial velocity of −8 km/s.[2]
This is an aging K-type giant star with a stellar classification of K3 III.[3] It is a red clump giant,[9] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. The star is around five billion years old with 1.1[4] times the mass of the Sun and has expanded to 12[1] times the Sun's radius. It is radiating 52[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,472 K.[4]
References[edit]
- ^ a b c d e f g h i 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 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 Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode:1952ApJ...116..122R, doi:10.1086/145598.
- ^ a b c d da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105, S2CID 9341088.
- ^ a b Setiawan, J.; et al. (July 2004), "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch", Astronomy and Astrophysics, 421: 241–254, Bibcode:2004A&A...421..241S, doi:10.1051/0004-6361:20041042-1.
- ^ "20 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 8, 2019.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
- ^ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv:astro-ph/0003329, Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID 16673121
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.
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