| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 33m 43.47908s[1] |
| Declination | +04° 45′ 25.1949″[1] |
| Apparent magnitude (V) | 5.867[2] |
| Characteristics | |
| Spectral type | G5 III[3] |
| U−B color index | +0.87[4] |
| B−V color index | +1.07[4] |
| Astrometry | |
| Radial velocity (Rv) | +1.60 ± 0.3[5] km/s |
| Proper motion (μ) | RA: −13.18[1] mas/yr Dec.: −6.84[1] mas/yr |
| Parallax (π) | 1.98 ± 0.41 mas[1] |
| Distance | approx. 1,600 ly (approx. 500 pc) |
| Details[6][note 1] | |
| Mass | 4.58 ± 0.40 M☉ |
| Radius | 48.41 ± 9.26 R☉ |
| Luminosity | 1109.6 ± 422.9 L☉ |
| Surface gravity (log g) | 1.80 ± 0.15 cgs |
| Temperature | 4792 ± 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.[6]
References
- 1 2 3 4 5 6 van Leeuwen, F. (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. S2CID 18759600.
- 1 2 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.
- 1 2 "HR 3378". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 August 2017.
- 1 2 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. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- 1 2 Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. hdl:10722/215277. S2CID 59334290.
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%.
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