Theta1 Microscopii
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Microscopium |
| Right ascension | 21h 20m 45.63900s[1] |
| Declination | −40° 48′ 34.0512″[1] |
| Apparent magnitude (V) | 4.82[2] |
| Characteristics | |
| Spectral type | A7VpSrCrEu[3] |
| U−B color index | -0.07[2] |
| B−V color index | +0.02[2] |
| Astrometry | |
| Radial velocity (Rv) | +2.30[4] km/s |
| Proper motion (μ) | RA: +71.92[1] mas/yr Dec.: +20.38[1] mas/yr |
| Parallax (π) | 16.54 ± 1.19 mas[1] |
| Distance | 200 ± 10 ly (60 ± 4 pc) |
| Absolute magnitude (MV) | 1.03[5] |
| Details | |
| Mass | 2.27[6] M☉ |
| Radius | 2.2[6] R☉ |
| Luminosity | 36.64[5] L☉ |
| Surface gravity (log g) | 4.31[7] cgs |
| Temperature | 11,328[7] K |
| Metallicity [Fe/H] | 0.00[8] dex |
| Rotational velocity (v sin i) | 43[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Theta1 Microscopii (θ1 Mic) is a class A7 main sequence star in the constellation Microscopium. Its apparent magnitude is 4.82[2] and it is approximately 197 light years away based on parallax.[1]
It is reported as an α² CVn variable with a period of 2.125 days and a magnitude ranging from 4.77 to 4.87,[9] as well as a chemically peculiar star with strong metallic lines in its spectrum.[3][5]
References
- ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
- ^ a b c d 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 Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
- ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. LCCN 54001336.
- ^ a b c 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. Vizier catalog entry
- ^ 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. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
- ^ a b c 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. Vizier catalog entry
- ^ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. Vizier catalog entry
- ^ Watson, C. L. (2006). "The International Variable Star Index (VSX)". The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23–25. 25: 47. Bibcode:2006SASS...25...47W.
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