Alkaid
Alkaid or Eta Ursae Majoris is a white star in the Ursa Major constellation.
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 13h 47m 32.43776s[1] |
| Declination | +49° 18′ 47.7602″[1] |
| Apparent magnitude (V) | +1.86[2] |
| Characteristics | |
| Spectral type | B3 V[3] |
| U−B color index | –0.68[2] |
| B−V color index | –0.19[2] |
| Astrometry | |
| Radial velocity (Rv) | –10.9[4] km/s |
| Proper motion (μ) | RA: –121.17[1] mas/yr Dec.: –14.91[1] mas/yr |
| Parallax (π) | 31.38 ± 0.24[1] mas |
| Distance | 103.9 ± 0.8 ly (31.9 ± 0.2 pc) |
| Absolute magnitude (MV) | −0.67[5] |
| Details | |
| Mass | 6.1 ± 0.1[6] M☉ |
| Radius | 3.4[7] R☉ |
| Luminosity | 594 ± 31[8] L☉ |
| Surface gravity (log g) | 3.78[8] cgs |
| Temperature | 15,540 ± 1157[8] K |
| Rotational velocity (v sin i) | 150[9] km/s |
| Age | 10.0 ± 2.6[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Alkaid Media
Comparison of Alkaid and the Sun
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, Floor. Validation of the new Hipparcos reduction. Astronomy and Astrophysics 474 (2) (2007). p. 653–664. doi:10.1051/0004-6361:20078357. Note: see VizieR catalogue I/311.
- ↑ 2.0 2.1 2.2 Ducati, J. R.. VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system. CDS/ADC Collection of Electronic Catalogues 2237 (2002). p. 0.
- ↑ Morgan, W. W.. Spectral Classification. Annual Review of Astronomy and Astrophysics 11 (1973). p. 29. doi:10.1146/annurev.aa.11.090173.000333.
- ↑ Wielen, R.. Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions. Veröff. Astron. Rechen-Inst. Heidelb 35 (35) (1999). p. 1.
- ↑ Anderson, E.. XHIP: An extended hipparcos compilation. Astronomy Letters 38 (5) (2012). p. 331. doi:10.1134/S1063773712050015.
- ↑ 6.0 6.1 Tetzlaff, N.. A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun. Monthly Notices of the Royal Astronomical Society 410 (1) (January 2011). p. 190–200. doi:10.1111/j.1365-2966.2010.17434.x.
- ↑ Underhill, A. B.. Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars. Monthly Notices of the Royal Astronomical Society 189 (3) (November 1979). p. 601–605. doi:10.1093/mnras/189.3.601.
- ↑ 8.0 8.1 8.2 Baines, E.. Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer. The Astronomical Journal 155 (1) (2017). p. 30. doi:10.3847/1538-3881/aa9d8b.
- ↑ Abt, Helmut A.. Rotational Velocities of B Stars. The Astrophysical Journal 573 (1) (July 2002). p. 359–365. doi:10.1086/340590.
- ↑ Rumrill, H. B.. Star Name Pronunciation. Publications of the Astronomical Society of the Pacific 48 (283) (1936). p. 139. doi:10.1086/124681.
Other websites
- Alkaid at Jim Kaler's Stars website
