Pi Puppis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Puppis |
| Right ascension | 07h 17m 08.55678s |
| Declination | −37° 05′ 50.8962″ |
| Apparent magnitude (V) | 2.69 – 2.76 |
| Characteristics | |
| Spectral type | K3 Ib |
| U−B color index | +1.238 |
| B−V color index | +1.608 |
| Variable type | SRd |
| Astrometry | |
| Radial velocity (Rv) | +15.8 km/s |
| Proper motion (μ) | RA: −10.05 mas/yr Dec.: +6.47 mas/yr |
| Parallax (π) | 4.04±0.33 mas |
| Distance | 810 ± 70 ly (250 ± 20 pc) |
| Absolute magnitude (MV) | −4.5 |
| Details | |
| Mass | 11.7±0.2 M☉ |
| Radius | 235 R☉ |
| Luminosity | 11,378 L☉ |
| Surface gravity (log g) | 0.13 cgs |
| Temperature | 3,990–4,055 K |
| Age | 20.0±3.9 Myr |
| Other designations | |
| π Pup, CPD−36°1211, FK5 278, GC 9706, HD 56855, HIP 35264, HR 2773, SAO 197795, PPM 283747, CCDM J07171-3706A, WDS J07171-3706A | |
| Database references | |
| SIMBAD | data |
Pi Puppis, Latinized from π Puppis, also named Ahadi, is the second-brightest star in the southern constellation of Puppis. It has an apparent visual magnitude of about 2.7, so it can be viewed with the naked eye at night. Parallax measurements yield an estimated distance of roughly 810 light-years (250 parsecs) from the Earth. This is a double star with a magnitude 6.86 companion at an angular separation of 0.72 arcsecond and a position angle of 148° from the brighter primary.