Delta Apodis
Star in the constellation Apus / From Wikipedia, the free encyclopedia
Delta Apodis (δ Aps, δ Apodis) is the Bayer designation for a double star in the southern constellation of Apus.
Quick Facts Observation data Epoch J2000 Equinox J2000, Apparent magnitude (V) ...
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−B color index | +1.68/+1.62[3] |
B−V color 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 | |
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 |
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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.[11] It is classified as a semiregular variable with pulsations of multiple periods of 68.0, 94.9 and 101.7 days.[12] 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.