Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 10m 23.93342s[1] |
Declination | 25° 05′ 30.0394″[1] |
Apparent magnitude (V) | 4.83[2] |
Characteristics | |
Spectral type | F9IVw[3] |
U−B color index | +0.07[2] |
B−V color index | +0.54[2] |
Astrometry | |
Radial velocity (Rv) | +9.646±0.013[4] km/s |
Proper motion (μ) | RA: −23.43[1] mas/yr Dec.: −59.79[1] mas/yr |
Parallax (π) | 27.917 ± 0.044 mas[4] |
Distance | 116.8 ± 0.2 ly (35.82 ± 0.06 pc) |
Absolute magnitude (MV) | 2.00[5] |
Orbit[4] | |
Primary | 12 Boo Aa |
Companion | 12 Boo Ab |
Period (P) | 9.6045601±0.0000036 d |
Semi-major axis (a) | 3.4706±0.0055 mas |
Eccentricity (e) | 0.19214±0.00015 |
Inclination (i) | 107.95±0.12° |
Longitude of the node (Ω) | 80.49±0.10° |
Periastron epoch (T) | 2,454,100.43572±0.00070 |
Argument of periastron (ω) (secondary) | 286.832±0.029° |
Semi-amplitude (K1) (primary) | 67.189±0.011 km/s |
Semi-amplitude (K2) (secondary) | 69.311±0.014 km/s |
Details | |
12 Boo Aa | |
Mass | 1.4109±0.0028[4] M☉ |
Radius | 2.450[6] R☉ |
Luminosity | 7.531 L☉ |
Surface gravity (log g) | 3.73[5] cgs |
Temperature | 6115[6] K |
Metallicity [Fe/H] | −0.065[4] dex |
12 Boo Ab | |
Mass | 1.3677±0.0028[4] M☉ |
Radius | 1.901[6] R☉ |
Luminosity | 4.692[6] L☉ |
Temperature | 6200[6] K |
Metallicity [Fe/H] | −0.065[6] dex |
Other designations | |
Database references | |
SIMBAD | data |
12 Boötis is a spectroscopic binary[7] in the constellation Boötes. It is approximately 122 light years from Earth.[1]
12 Boötis is a yellow-white F-type subgiant with an apparent magnitude of +4.82. It is a spectroscopic binary pair which orbit around its centre of mass once every 9.6045 days,[3] with an estimated separation of 0.0035".[8] The two stars have similar masses around 1.4 M☉, both are slightly hotter than the Sun and about twice as large.[4]
A further companion, 12 Boötis B, was reported with a separation of approximately one arcsecond in 1989, but subsequent surveys have repeatedly failed to detect this companion.[3]
References[edit]
- ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
- ^ a b c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
- ^ a b c Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry
- ^ a b c d e f g Konacki, M. (2010). "High-precision Orbital and Physical Parameters of Double-lined Spectroscopic Binary Stars—HD78418, HD123999, HD160922, HD200077, and HD210027". The Astrophysical Journal. 719 (2): 1293–1314. arXiv:0910.4482. Bibcode:2010ApJ...719.1293K. doi:10.1088/0004-637X/719/2/1293. S2CID 119253596.
- ^ a b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
- ^ a b c d e f Ball, Warrick H.; Miglio, Andrea; Chaplin, William J.; Stassun, Keivan G.; García, Rafael; González-Cuesta, Lucia; Mathur, Savita; Appourchaux, Thierry; Benomar, Othman; Buzasi, Derek L.; Jiang (姜晨), Chen; Kayhan, Cenk; Örtel, Sibel; Çelik Orhan, Zeynep; Yıldız, Mutlu; Ong (王加冕), J M Joel; Basu, Sarbani (2022). "Solar-like oscillations and ellipsoidal variations in TESS observations of the binary 12 Boötis". Monthly Notices of the Royal Astronomical Society. 516 (3): 3709–3714. arXiv:2208.02302. Bibcode:2022MNRAS.516.3709B. doi:10.1093/mnras/stac2212.
- ^ Konacki, Maciej; et al. (2010). "High-precision Orbital and Physical Parameters of Double-lined Spectroscopic Binary Stars—HD78418, HD123999, HD160922, HD200077, and HD210027". The Astrophysical Journal. 719 (2): 1293–1314. arXiv:0910.4482. Bibcode:2010ApJ...719.1293K. doi:10.1088/0004-637X/719/2/1293. S2CID 119253596.
- ^ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. Vizier catalog entry
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