Pi1 Octantis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Octans |
| Right ascension | 15h 01m 50.7983s |
| Declination | −83° 13′ 39.530″ |
| Apparent magnitude (V) | 5.64±0.01 |
| Characteristics | |
| Spectral type | G8/K0 III |
| U−B color index | +0.74 |
| B−V color index | +0.95 |
| Astrometry | |
| Radial velocity (Rv) | 13.6±0.4 km/s |
| Proper motion (μ) | RA: +18.954 mas/yr Dec.: +52.520 mas/yr |
| Parallax (π) | 8.419±0.0349 mas |
| Distance | 387 ± 2 ly (118.8 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.24 |
| Details | |
| Mass | 2.74±0.15 M☉ |
| Radius | 11.62±0.21 R☉ |
| Luminosity | 76.2±1.7 L☉ |
| Surface gravity (log g) | 2.7±0.1 cgs |
| Temperature | 5,002±36 K |
| Metallicity [Fe/H] | −0.01±0.03 dex |
| Rotational velocity (v sin i) | <1 km/s |
| Other designations | |
| π1 Oct, 21 G. Octantis, CPD−82°629, FK5 3987, GC 20070, HD 130650, HIP 73540, HR 5525, SAO 258713 | |
| Database references | |
| SIMBAD | data |
Pi1 Octantis (Pi1 Oct), Latinized π1 Octantis, is a solitary star in the southern circumpolar constellation Octans. It is faintly visible to the naked eye with an apparent magnitude 5.64, and is estimated to be 387 light years away. However, it is receding with a heliocentric radial velocity of 14 km/s.
Pi1 Oct has a stellar classification of G8/K0 III — intermediate between a G8 and K0 giant star. It has 2.74 times the mass of the Sun and an effective temperature of 5,002 k, giving a yellow hue. However, an enlarged radius of 11.62 R☉ yields a luminosity 76 times that of the Sun. Pi1 Oct has a metallicity around solar level and spins with a projected rotational velocity lower than 1 km/s.