Zeta Volantis
Binary star in the constellation Volans
From Wikipedia, the free encyclopedia
Zeta Volantis, Latinized from ζ Volantis, is a binary star[6] system in the southern constellation of Volans. It has an apparent visual magnitude of 3.92,[2] which is bright enough to be seen with the naked eye. Based upon parallax measurements by the Gaia spacecraft, it is approximately 145 light-years (44.6 parsecs) from the Sun. The companion is a magnitude 9.7 star at an angular separation of 16.7″.[6] Based upon their motion through space, this system made its perihelion passage some 858,000 years ago when it came within 22 ly (6.6 pc) of the Sun.[7] It is currently moving away with a radial velocity of 48 km/s.[1]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Volans |
| Right ascension | 07h 41m 49.2590s[1] |
| Declination | −72° 36′ 21.957″[1] |
| Apparent magnitude (V) | 3.918±0.003 [2] |
| Characteristics | |
| Evolutionary stage | Giant star |
| Spectral type | K0 III[3] |
| B−V color index | 1.029±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | 48.5±0.14[1] km/s |
| Proper motion (μ) | RA: +36.179 mas/yr[1] Dec.: +14.816 mas/yr[1] |
| Parallax (π) | 22.4377±0.0947 mas[1] |
| Distance | 145.4 ± 0.6 ly (44.6 ± 0.2 pc)[1] |
| Absolute magnitude (MV) | +0.75[4] |
| Details[2] | |
| Mass | 1.224±0.155 M☉ |
| Radius | 10.677±0.255 R☉ |
| Luminosity | 60[1] L☉ |
| Surface gravity (log g) | 2.82±0.09 cgs |
| Temperature | 4,788±37 K |
| Metallicity [Fe/H] | −0.17±0.03 dex |
| Age | 5.1±1.515 Gyr |
| Other designations | |
| ζ Vol, CPD−72°627, FK5 297, HD 63295, HIP 37504, HR 3024, SAO 256438[5] | |
| Database references | |
| SIMBAD | data |
The primary component is K-type giant star with a stellar classification of K0 III.[3] It has a derived luminosity of around 60 times that of the Sun,[1] 1.2 times the Sun's mass and is about 5.1 billion years old. At this age, it has expanded to 10.7 times the Sun's size.[2] The expanded outer envelope has an effective temperature of 4,788 K,[2] giving it the orange glow of a K-type star.[8]