HD 72561
Star in the constellation Hydra
From Wikipedia, the free encyclopedia
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]
| 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 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%.
