Beta Apodis
 Location of β Apodis (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Apus |
| Right ascension | 16h 43m 04.65651s |
| Declination | −77° 31′ 02.7629″ |
| Apparent magnitude (V) | +4.24 |
| Characteristics | |
| Spectral type | K0 III |
| U−B color index | +0.95 |
| B−V color index | +1.06 |
| Astrometry | |
| Radial velocity (Rv) | −30.3 ± 0.7 km/s |
| Proper motion (μ) |
RA: −282.70 ± 0.14 mas/yr Dec.: −354.81 ± 0.17 mas/yr |
| Parallax (π) | 20.78 ± 0.20mas |
| Distance | 157 ± 2 ly (48.1 ± 0.5 pc) |
| Details | |
| Mass | 1.84 M☉ |
| Radius | 11 R☉ |
| Surface gravity (log g) | 3.0 cgs |
| Temperature | 4,900 K |
| Metallicity [Fe/H] | –0.02 dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Beta Apodis (β Aps, β Apodis) is the Bayer designation for a star in the southern circumpolar constellation of Apus. It is located approximately 158 light-years (48 parsecs) from Earth, as determined by parallax measurements. The apparent visual magnitude of this star is +4.24, which is bright enough to be seen with the naked eye
The spectrum of this star matches the characteristics of a K0 III, which, according to models of stellar evolution, indicates that it is in the giant star stage, having exhausted the supply of hydrogen at its core. The measured angular diameter of this star is 2.09 ± 0.11 mas. At the estimated distance of this star, this yields a physical size of about 11 times the radius of the Sun. The expanded outer atmosphere of Beta Apodis has an effective temperature of about 4,900 K. This heat is causing it to glow with the characteristic orange hue of a K-type star.
In Chinese caused by adaptation of the European southern hemisphere constellations into the Chinese system, 異雀 (Yì Què), meaning Exotic Bird, refers to an asterism consisting of β Apodis, ζ Apodis, ι Apodis, γ Apodis, δ Octantis, δ1 Apodis, η Apodis, α Apodis and ε Apodis. Consequently, β Apodis itself is known as 異雀三 (Yì Què sān, English: the Third Star of Exotic Bird.)
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