Eta Crucis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 06m 52.89814s |
| Declination | −64° 36′ 49.4305″ |
| Apparent magnitude (V) | 4.14 |
| Characteristics | |
| Spectral type | F2 V |
| U−B color index | +0.00 |
| B−V color index | +0.35 |
| Astrometry | |
| Radial velocity (Rv) | +13.13±0.26 km/s |
| Proper motion (μ) | RA: +34.270 mas/yr Dec.: −36.902 mas/yr |
| Parallax (π) | 50.7919±0.1049 mas |
| Distance | 64.2 ± 0.1 ly (19.69 ± 0.04 pc) |
| Absolute magnitude (MV) | 2.67 |
| Details | |
| Mass | 1.51±0.04 M☉ |
| Radius | 1.854±0.005 R☉ |
| Luminosity | 6.901+0.027 −0.029 L☉ |
| Surface gravity (log g) | 4.01±0.00 cgs |
| Temperature | 6,830 K |
| Metallicity [Fe/H] | −0.04 dex |
| Rotational velocity (v sin i) | 46.1±2.3 km/s |
| Age | 1.63±0.29 Gyr |
| Other designations | |
| η Cru, CD−63°2145, GJ 455.2, GJ 9388, HD 105211, HIP 59072, HR 4616, SAO 251742 | |
| Database references | |
| SIMBAD | data |
Eta Crucis (η Crucis) is a solitary star in the southern constellation of Crux. It can be seen with the naked eye, having an apparent visual magnitude of 4.14m. Based upon parallax measurements, η Crucis is located at a distance of 64 light-years. The system made its closest approach about 1.6 million years ago when it achieved perihelion at a distance of roughly 26 light years.
This is an F-type main sequence star with a stellar classification of F2 V. It has 151% of the Sun's mass, 185% of the Sun's radius and shines with 6.9 times the luminosity of the Sun from its outer atmosphere with an effective temperature of 6,830 K.
Eta Crucis has a pair of visual companions. Component B is a magnitude 11.80 star located at an angular separation of 48.30″ along a position angle of 300°, as of 2010. Component C has a magnitude of 12.16 and lies at an angular separation of 35.50″ along a position angle of 194°, as of 2000.