Delta Hydri
 
| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydrus |
| Right ascension | 02h 21m 44.94286s[1] |
| Declination | −68° 39′ 33.9038″[1] |
| Apparent magnitude (V) | 4.09[2] |
| Characteristics | |
| Spectral type | A2V[3] |
| U−B color index | +0.05[2] |
| B−V color index | +0.03[2] |
| Astrometry | |
| Radial velocity (Rv) | +6.00[4] km/s |
| Proper motion (μ) | RA: -49.95[1] mas/yr Dec.: +2.48[1] mas/yr |
| Parallax (π) | 23.35 ± 0.34[1] mas |
| Distance | 140 ± 2 ly (42.8 ± 0.6 pc) |
| Absolute magnitude (MV) | 0.92[3] |
| Details | |
| Mass | 2.25[5] M☉ |
| Radius | 2.3[5] R☉ |
| Luminosity | 39.52[3] L☉ |
| Surface gravity (log g) | 3.98[6] cgs |
| Temperature | 9,880[6] K |
| Metallicity [Fe/H] | +0.12[3] dex |
| Rotational velocity (v sin i) | 162[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta Hydri (δ Hyi) is a class A2V[3] (white main-sequence) star in the constellation Hydrus. Its apparent magnitude is 4.09[2] and it is approximately 140 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 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.
- 1 2 3 4 5 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
- ↑ Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776.
- 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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