NO Apodis
NO Apodis is a solitary, red hued variable star located in the southern circumpolar constellation Apus. It has an average apparent magnitude of 5.86, allowing it to be faintly seen with the naked eye. The object is relatively far at a distance of 790 light years but is drifting closer with a heliocentric radial velocity −18.3 km/s.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Apus |
| Right ascension | 17h 31m 27.4667s |
| Declination | −80° 51′ 32.8761″ |
| Apparent magnitude (V) | 5.71-5.95 |
| Characteristics | |
| Evolutionary stage | AGB |
| Spectral type | M3 III |
| U−B color index | +1.80 |
| B−V color index | +1.67 |
| Variable type | Semiregular |
| Astrometry | |
| Radial velocity (Rv) | −18.3±0.6 km/s |
| Proper motion (μ) | RA: −3.662 mas/yr Dec.: −43.943 mas/yr |
| Parallax (π) | 4.1479 ± 0.0741 mas |
| Distance | 790 ± 10 ly (241 ± 4 pc) |
| Absolute magnitude (MV) | −1.32 |
| Details | |
| Mass | 1.63 M☉ |
| Radius | 107 R☉ |
| Luminosity | 1,408 L☉ |
| Surface gravity (log g) | 1.7±0.1 cgs |
| Temperature | 3,521±122 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
NO Apodis has a stellar classification of M3 III, indicating that it is a red giant. It is currently on the asymptotic giant branch, fusing hydrogen and helium shells around an inert carbon core. At present it has 1.63 times the mass of the Sun and an enlarged radius of 107 R☉. It shines with a bolometric luminosity 1,408 times that of the Sun from its photosphere at an effective temperature of 3,521 K.
NO Apodis is classified as a semiregular variable of unknown subtype. Observations from Tabur et. al. (2009) reveal it to have two periods, both lasting 26-7 days. During this timeframe, the star flucates between 5.71 and 5.95 in the visual band.
| Period | Days | Amplitude |
|---|---|---|
| 1 | 26.2 | 0.04 |
| 2 | 26.6 | 0.092 |