Delta Apodis
Location of δ Apodis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Apus[1] |
| δ1 Aps | |
| Right ascension | 16h 20m 20.802s[2] |
| Declination | −78° 41′ 44.69″[2] |
| Apparent magnitude (V) | 4.66 to 4.87[3] |
| δ2 Aps | |
| Right ascension | 16h 20m 26.858s[4] |
| Declination | −78° 40′ 02.99″[4] |
| Apparent magnitude (V) | +5.27[5] |
| Characteristics | |
| δ1 Aps | |
| Spectral type | M5 IIIb[6] |
| U−B color index | +1.680±0.110[1] |
| B−V color index | +1.69[5] |
| Variable type | LB?[3] |
| δ2 Aps | |
| Spectral type | K3 III[6] |
| U−B color index | +1.62[5] |
| B−V color index | +1.413±0.012[1] |
| Astrometry | |
| δ1 Aps | |
| Radial velocity (Rv) | −12.0[7] km/s |
| Proper motion (μ) | RA: −9.678 mas/yr[2] Dec.: −37.147 mas/yr[2] |
| Parallax (π) | 5.2508±0.1942 mas[2] |
| Distance | 620 ± 20 ly (190 ± 7 pc) |
| Absolute magnitude (MV) | −2.16[1] |
| δ2 Aps | |
| Radial velocity (Rv) | −10.2[8] km/s |
| Proper motion (μ) | RA: −1.817 mas/yr[2] Dec.: −31.511 mas/yr[2] |
| Parallax (π) | 5.795±0.0902 mas[2] |
| Distance | 563 ± 9 ly (173 ± 3 pc) |
| Absolute magnitude (MV) | −1.10[1] |
| Other designations | |
| CPD−78 1092, FK5 1424, HR 6020[9][10] | |
| δ1 Aps: HD 145366, HIP 80047, SAO 257380[9] | |
| δ2 Aps: HD 145388, HIP 80057, SAO 257381[10] | |
| Database references | |
| SIMBAD | δ1 Aps |
| δ2 Aps | |
Delta Apodis is a double star in the southern constellation of Apus. Its identifier is a Bayer designation that is Latinized from δ Apodis, and abbreviated Del Aps or δ Aps, respectively. Based on parallax measurements, the distance to δ1 Apodis is approximately 620 light years,[2] while δ2 Apodis is found to be around 563 light years from Earth.[4] They may form a common proper motion pair.[citation needed]
The brighter star, δ1 Apodis, has an apparent magnitude that varies from +4.66 to +4.87.[12] It is a red giant with a stellar classification of M5 IIIb,[6] and is classified as a semiregular variable with pulsations of multiple periods of 68.0, 94.9 and 101.7 days.[13] δ2 Apodis has an apparent magnitude of +5.27 and is an orange K-type giant with a class of K3 III.[6] Both stars are bright enough to be seen with the naked eye under good observing conditions. The pair have an angular separation of 103.4 arcseconds (as of 2016),[14] which is wide enough to allow them to be seen individually by a person with good eyesight.
Naming
[edit | edit source]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 δ1 Apodis, ζ Apodis, ι Apodis, β Apodis, γ Apodis, δ Octantis, η Apodis, α Apodis and ε Apodis. Consequently, δ1 Apodis itself is known as 異雀六 (Yì Què liù, English: the Sixth Star of Exotic Bird.)[15]
References
[edit | edit source]- ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d e f g Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 29 日 Archived 2011-05-22 at the Wayback Machine
