Zeta Hydri
 
| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydrus |
| Right ascension | 02h 45m 32.63435s[1] |
| Declination | −67° 36′ 59.8268″[1] |
| Apparent magnitude (V) | 4.83[2] |
| Characteristics | |
| Spectral type | A2IV[2] |
| U−B color index | +0.09[3] |
| B−V color index | +0.06[3] |
| Astrometry | |
| Radial velocity (Rv) | +3.60[4] km/s |
| Proper motion (μ) | RA: +66.41[1] mas/yr Dec.: +43.38[1] mas/yr |
| Parallax (π) | 11.47 ± 0.17[1] mas |
| Distance | 284 ± 4 ly (87 ± 1 pc) |
| Absolute magnitude (MV) | 0.13[2] |
| Details | |
| Mass | 2.44[5] M☉ |
| Radius | 3.9[5] R☉ |
| Luminosity | 79.55[2] L☉ |
| Surface gravity (log g) | 3.72[6] cgs |
| Temperature | 9,144[6] K |
| Rotational velocity (v sin i) | 116[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Zeta Hydri (ζ Hyi) is a class A2IV[2] (white subgiant) star in the constellation Hydrus. Its apparent magnitude is 4.83[2] and it is approximately 284 light years away based on parallax.[1]
References
- 1 2 3 4 5 6 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 - 1 2 3 4 5 6 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
- 1 2 Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
- ↑ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. LCCN 54001336.
- 1 2 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
- 1 2 3 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
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