26 Hydrae
Appearance
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hydra |
Right ascension | 09h 19m 46.38236s[1] |
Declination | −11° 58′ 29.4639″[1] |
Apparent magnitude (V) | 4.770[2] |
Characteristics | |
Spectral type | G8II[3] |
U−B color index | +0.67[4] |
B−V color index | +0.93[4] |
Astrometry | |
Radial velocity (Rv) | -1.18 ± 0.09[5] km/s |
Proper motion (μ) | RA: -27.65[1] mas/yr Dec.: 12.76[1] mas/yr |
Parallax (π) | 9.68 ± 0.55 mas[1] |
Distance | 340 ± 20 ly (103 ± 6 pc) |
Details | |
Mass | 2.72[6] M☉ |
Radius | 14[5] R☉ |
Luminosity | 135 L☉ |
Surface gravity (log g) | 2.48 ± 0.07[7] cgs |
Temperature | 5003 ± 82[6] K |
Metallicity [Fe/H] | -0.13 ± 0.06[7] dex |
Age | 0.51[6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
26 Hydrae (26 Hya) is a star in the constellation Hydra. Its apparent magnitude is 4.78.
References
- ^ a b c d e van Leeuwen, F.; et al. (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.
- ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- ^ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
- ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M.
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(help) - ^ a b Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal. 135: 209. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
- ^ a b c Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88.
- ^ a b Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014.