HD 72561

Last updated
HD 72561
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
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  mas [1]
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
BD+05°1997, HIP 42008, HR 3378, SAO 116890 [4]
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

  1. ↑ 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. 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.
  2. 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.
  3. ↑ 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. arXiv: 1805.04094 . Bibcode:2018A&A...616A..33S. doi:10.1051/0004-6361/201833111.
  4. 1 2 "HR 3378". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 23 August 2017.
  5. 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.
  6. ↑ 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.
  7. 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.
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