Gamma Gruis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Grus |
| Right ascension | 21h 53m 55.72620s |
| Declination | −37° 21′ 53.4790″ |
| Apparent magnitude (V) | 3.003 |
| Characteristics | |
| Spectral type | B8 III or B8IV-Vs |
| U−B color index | −0.307 |
| B−V color index | −0.121 |
| Astrometry | |
| Radial velocity (Rv) | −2.1 km/s |
| Proper motion (μ) | RA: +98.07 mas/yr Dec.: −13.22 mas/yr |
| Parallax (π) | 15.45±0.67 mas |
| Distance | 211 ± 9 ly (65 ± 3 pc) |
| Absolute magnitude (MV) | −1.05 |
| Details | |
| Mass | 3.06 M☉ |
| Radius | 4.5 R☉ |
| Luminosity | 373 L☉ |
| Surface gravity (log g) | 3.79 cgs |
| Temperature | 12,520 K |
| Rotation | 4.987 d |
| Rotational velocity (v sin i) | 57 km/s |
| Age | 75 Myr |
| Other designations | |
| γ Gru, Gamma Gru, CD−37°9119, FK5 822, GC 30640, HD 207971, HIP 108085, HR 8353, SAO 213374 | |
| Database references | |
| SIMBAD | data |
Gamma Gruis or γ Gruis, formally named Aldhanab (/ˈældənæb/), is a star in the southern constellation of Grus (it once belonged to the Ptolemaic constellation Piscis Austrinus). With an apparent visual magnitude of 3.0, it is the third-brightest star in Grus. Based upon parallax measurements, this star is located at a distance of roughly 211 light-years (65 parsecs) from the Sun.