Astronomy:HD 72561
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Short description: Star in the constellation Hydra
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 33m 43.47908s[1] |
| Declination | +04° 45′ 25.1949″[1] |
| Apparent magnitude (V) | 5.867[2] |
| Characteristics | |
| Evolutionary stage | horizontal branch[3] |
| Spectral type | G5 III[4] |
| U−B color index | +0.87[5] |
| B−V color index | +1.07[5] |
| Astrometry | |
| Radial velocity (Rv) | +1.60±0.3[6] km/s |
| Proper motion (μ) | RA: −13.18[1] mas/yr Dec.: −6.84[1] mas/yr |
| Parallax (π) | 1.98 ± 0.41[1] mas |
| Distance | approx. 1,600 ly (approx. 500 pc) |
| Details[7][note 1] | |
| Mass | 4.58±0.40 M☉ |
| Radius | 48.41±9.26 R☉ |
| Luminosity | 1,109.6±422.9 L☉ |
| Surface gravity (log g) | 1.80±0.15 cgs |
| Temperature | 4,792±36 K |
| Metallicity [Fe/H] | −0.16±0.10 dex |
| Age | 0.15±0.04 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 72561 is a star in the constellation Hydra. Its apparent magnitude is 5.867.[2] Based on parallax shift, it is located about 1,600 light-years (500 parsecs) away.[1]
HD 72561 is a G-type giant star. It is over 4 times as massive as the Sun and 48 times as wide. It is about 150 million years old.[7]
Notes
- ↑ The Reffert et al. paper gives two different sets of results, depending on whether the star is a horizontal branch star or a red giant branch star. The parameters given here are for a horizontal branch star, since the probability of it being a horizontal branch star is 99%.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H.
- ↑ Stock, Stephan; Reffert, Sabine; Quirrenbach, Andreas (2018). "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search". Astronomy and Astrophysics 616: A33. doi:10.1051/0004-6361/201833111. Bibcode: 2018A&A...616A..33S.
- ↑ 4.0 4.1 "HR 3378". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+3378.
- ↑ 5.0 5.1 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99. Bibcode: 1966CoLPL...4...99J.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 7.0 7.1 Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics 574: A116. doi:10.1051/0004-6361/201322360. Bibcode: 2015A&A...574A.116R.
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