Delta Apodis
Delta Apodis (δ Aps, δ Apodis) is the Bayer designation for a double star in the southern constellation of Apus.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Apus |
| δ1 Aps | |
| Right ascension | 16h 20m 20.80462s |
| Declination | −78° 41′ 44.6889″ |
| Apparent magnitude (V) | +4.66 - 4.87 |
| δ2 Aps | |
| Right ascension | 16h 20m 26.85843s |
| Declination | −78° 40′ 02.9901″ |
| Apparent magnitude (V) | +5.27 |
| Characteristics | |
| Spectral type | M5 IIIb + K3 III |
| U−B color index | +1.68/+1.62 |
| B−V color index | +1.69/+1.41 |
| Variable type | LB? |
| Astrometry | |
| δ1 Aps | |
| Radial velocity (Rv) | −12.0 km/s |
| Proper motion (μ) | RA: −9.122±0.390 mas/yr Dec.: −36.968±0.505 mas/yr |
| Parallax (π) | 5.1748 ± 0.2734 mas |
| Distance | 630 ± 30 ly (190 ± 10 pc) |
| δ2 Aps | |
| Radial velocity (Rv) | −10.2 km/s |
| Proper motion (μ) | RA: −1.321±0.229 mas/yr Dec.: −31.507±0.259 mas/yr |
| Parallax (π) | 5.9845 ± 0.1353 mas |
| Distance | 550 ± 10 ly (167 ± 4 pc) |
| Other designations | |
| δ1 Aps: HD 145366, HIP 80047, SAO 257380. | |
| δ2 Aps: HD 145388, HIP 80057, SAO 257381. | |
| Database references | |
| SIMBAD | δ1 Aps |
| δ2 Aps | |
The brighter star, δ1 Apodis, is an M-type red giant and has an apparent magnitude that varies from magnitude +4.66 to +4.87. It is classified as a semiregular variable with pulsations of multiple periods of 68.0, 94.9 and 101.7 days. At an angular separation of 102.9 arcseconds is δ2 Apodis, an orange K-type giant with an apparent magnitude of +5.27.
Hipparcos data report the distance to δ1 Apodis to be approximately 760 light years, while δ2 Apodis is found to be around 610 light years from Earth. They may form a common proper motion pair.
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