| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Apus |
| Right ascension | 15h31m 30.82213s[1] |
| Declination | −73° 23′ 22.5295″[1] |
| Apparent magnitude (V) | 5.52[2] |
| Characteristics | |
| Spectral type | B1npe[3] |
| U−B color index | −0.791[2] |
| B−V color index | −0.128[2] |
| Variable type | γ Cas[4] |
| Astrometry | |
| Radial velocity (Rv) | +62[5] km/s |
| Proper motion (μ) | RA: +0.996[1] mas/yr Dec.: −18.345[1] mas/yr |
| Parallax (π) | 3.0798 ± 0.0717 mas[1] |
| Distance | 1,060 ± 20 ly (325 ± 8 pc) |
| Absolute magnitude (MV) | −2.47[6] |
| Details | |
| Mass | 12.0±0.3[7] M☉ |
| Luminosity | 2,120[6] L☉ |
| Surface gravity (log g) | 3.90[8] cgs |
| Temperature | 21,500[8] K |
| Age | 5.6±1.0[7] Myr |
| Other designations | |
κ1 Aps, CD−72°1139, CPD−72°1802, FK5 567, HD 137387, HIP 76013, HR 5730, SAO 257289[9] | |
| Database references | |
| SIMBAD | data |
Kappa1 Apodis, Latinized from κ1 Apodis, is the Bayer designation for a binary star[3] system in the southern circumpolar constellationofApus. Based upon parallax measurements, it is located roughly 1,060 light-years (325 parsecs) from Earth. The combined apparent visual magnitude of the system is 5.52,[2] indicating that this is a faint, naked eye star that can be viewed in dark suburban skies. It is moving away from the Sun with a radial velocity of +62 km/s.[5]
This is a spectroscopic binary system with an orbital period of 0.6 days.[3] The combined spectrum matches a stellar classification of B1npe.[3] The 'e' suffix indicates that this is a Be star with emission lines in the spectrum. An 'n' means that the absorption lines in the spectrum are broadened from the Doppler effect as a result of rapid rotation. Finally, the 'p' shows some peculiarity in the spectrum. It is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +5.43 to +5.61.
This is a runaway star with a peculiar velocityof69.8±4.7 km/s.[7] Because it is a binary star system, it was most likely not turned into a runaway system as the result of a supernova explosion.[3] A companion star is a 12th magnitude orange K-type subgiant located at an angular separation of 27 arcseconds.
