  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Apus |
| δ1 Aps | |
| Right ascension | 16h 20m 20.80462s[1] |
| Declination | −78° 41′ 44.6889″[1] |
| Apparent magnitude (V) | +4.66 - 4.87[2] |
| δ2 Aps | |
| Right ascension | 16h 20m 26.85843s[1] |
| Declination | −78° 40′ 02.9901″[1] |
| Apparent magnitude (V) | +5.27[3] |
| Characteristics | |
| Spectral type | M5 IIIb + K3 III[4] |
| U−Bcolor index | +1.68/+1.62[3] |
| B−Vcolor index | +1.69/+1.41[3] |
| Variable type | LB?[2] |
| Astrometry | |
| δ1 Aps | |
| Radial velocity (Rv) | −12.0[5] km/s |
| Proper motion (μ) | RA: −9.122±0.390[6]mas/yr Dec.: −36.968±0.505[6]mas/yr |
| Parallax (π) | 5.1748±0.2734 mas[6] |
| Distance | 630 ± 30 ly (190 ± 10 pc) |
| δ2 Aps | |
| Radial velocity (Rv) | −10.2[7] km/s |
| Proper motion (μ) | RA: −1.321±0.229[6] mas/yr Dec.: −31.507±0.259[6] mas/yr |
| Parallax (π) | 5.9845 ± 0.1353 mas[6] |
| Distance | 550 ± 10 ly (167 ± 4 pc) |
| Other designations | |
| CP-78 1092,FK5 1424,HR 6020.[8][9] | |
| δ1 Aps:HD 145366,HIP 80047,SAO 257380.[8] | |
| δ2 Aps: HD 145388, HIP 80057, SAO 257381.[9] | |
| Database references | |
| SIMBAD | δ1 Aps |
| δ2 Aps | |
Delta Apodis (δ Aps, δ Apodis) is theBayer designation for adouble star in the southernconstellation ofApus.
The brighter star,δ1 Apodis, is anM-typered giant and has anapparent magnitude that varies from magnitude +4.66 to +4.87.[11] It is classified as asemiregular variable with pulsations of multiple periods of 68.0, 94.9 and 101.7 days.[12] At anangular separation of 102.9arcseconds isδ2 Apodis, an orangeK-typegiant with anapparent magnitude of +5.27. Both stars are bright enough to be seen with thenaked eye under good observing conditions, and the separation between the stars is wide enough to allow them to be seen individually by a person with good eyesight.
Hipparcos data report the distance to δ1 Apodis to be approximately 760light years, while δ2 Apodis is found to be around 610light years fromEarth. They may form acommon proper motion pair.
InChinese caused by adaptation of the European southern hemisphere constellations into the Chinese system,異雀 (Yì Què), meaningExotic Bird, refers to an asterism consisting of δ1 Apodis,ζ Apodis,ι Apodis,β Apodis,γ Apodis,δ Octantis,η Apodis,α Apodis andε Apodis. Consequently, δ1 Apodis itself is known as異雀六 (Yì Què liù, English:the Sixth Star of Exotic Bird.)[13]
