KQ Puppis
KQ Puppis is the bright red star on the right, with Messier 47 to its left (east) and Messier 46 even further east. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Puppis |
| Right ascension | 07h 33m 47.96383s |
| Declination | −14° 31′ 26.0026″ |
| Apparent magnitude (V) | +4.97 (4.82 - 5.17) |
| Characteristics | |
| KQ Pup A | |
| Evolutionary stage | Red supergiant |
| Spectral type | M2Iab |
| U−B color index | +0.29 |
| B−V color index | +1.41 |
| Variable type | Slow irregular variable |
| KQ Pup B | |
| Evolutionary stage | Main sequence |
| Spectral type | B2V + (A/F)V |
| Astrometry | |
| Radial velocity (Rv) | +34.4 km/s |
| Proper motion (μ) | RA: -7 mas/yr Dec.: +4 mas/yr |
| Parallax (π) | 1.29±0.10 mas |
| Distance | 2,500 ± 200 ly (780 ± 60 pc) |
| Orbit | |
| Primary | KQ Pup Ba |
| Name | KQ Pup Bb |
| Period (P) | 17.2596 days |
| Semi-major axis (a) | 0.3 au |
| Eccentricity (e) | ≥0.236 |
| Inclination (i) | ~90° |
| Orbit | |
| Primary | KQ Pup A |
| Name | KQ Pup B |
| Period (P) | 9,500 days |
| Semi-major axis (a) | 24.89±1.48 au |
| Eccentricity (e) | 0.62±0.01 |
| Inclination (i) | 70.3±1.2° |
| Longitude of the node (Ω) | 319.3±3.6° |
| Periastron epoch (T) | 60,310 MJD |
| Argument of periastron (ω) (primary) | 203.5±2.2° |
| Semi-amplitude (K1) (primary) | 17.1 km/s |
| Details | |
| KQ Pup A | |
| Mass | 9.12+1.73 −1.53 M☉ |
| Radius | 491+41 −36 R☉ |
| Luminosity | 38,000+7,700 −4,900 L☉ |
| Temperature | 3,660±170 K |
| Age | 18.7–46.9 Myr |
| KQ Pup Ba | |
| Mass | 7.5–11.5 M☉ |
| Luminosity | 8,900 L☉ |
| Temperature | 19,900 K |
| Rotational velocity (v sin i) | 190±70 km/s |
| Age | 18.7–46.9 Myr |
| KQ Pup Bb | |
| Mass | 4.4+3.7 −3.2 M☉ |
| Age | 18.7–46.9 Myr |
| Other designations | |
| KQ Pup, BD−14°1971, HIP 36773, HR 2902, NGC 2422 9, SAO 153072 | |
| KQ Pup A: HD 60414 | |
| KQ Pup B: HD 60415 | |
| Database references | |
| SIMBAD | data |
KQ Puppis is a triple star system in the constellation of Puppis. With an apparent magnitude varying between 4.82 and 5.17, it is faintly visible to the naked eye under skies with little to no luminous pollution. Based on dynamical parallax measurements, it is located at a distance of 2,500 light-years (770 parsecs).