  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Puppis |
| Right ascension | 07h 52m 13.03173s [1] |
| Declination | −40° 34′ 32.8318″ [1] |
| Apparent magnitude (V) | 3.71 [2] (4.2 + 5.0) [3] |
| Characteristics | |
| Spectral type | K1II+A0.5 [4] |
| U−B color index | +0.75 [5] |
| B−V color index | +1.05 [5] |
| Astrometry | |
| Radial velocity (Rv) | +24.00 [6] km/s |
| Proper motion (μ) | RA: -18.00 [1] mas/yr Dec.: +5.01 [1] mas/yr |
| Parallax (π) | 8.46±0.40 mas [7] |
| Distance | 390 ± 20 ly (118 ± 6 pc) |
| Absolute magnitude (MV) | -1.44 [2] |
| Orbit [7] | |
| Period (P) | 6.13+0.031 −0.033 yr |
| Semi-major axis (a) | 0.058+0.001 −0.003″ |
| Eccentricity (e) | 0.667+0.017 −0.018 |
| Inclination (i) | 79.683+2.798 −4.02° |
| Longitude of the node (Ω) | 95.118+2.565 −2.183° |
| Periastron epoch (T) | 1981.442+0.074 −0.084 |
| Argument of periastron (ω) (secondary) | 157.473+5.584 −3.427° |
| Details | |
| A | |
| Mass | 6.058+0.15 −0.125 [7] M☉ |
| Radius | 30.75±1.64 [8] R☉ |
| Luminosity | 405±35 [8] L☉ |
| Surface gravity (log g) | 2.078±0.178 [8] cgs |
| Temperature | 4,670±72 [8] K |
| Metallicity [Fe/H] | −0.048±0.052 [8] dex |
| Rotational velocity (v sin i) | 2.3 [9] km/s |
| B | |
| Mass | 2.381+0.375 −0.334 [7] M☉ |
| Other designations | |
| a Puppis, CD−40°3579, FK5 301, GC 10655, HD 64440, HIP 38414, HR 3080, WDS J07522-4035AB | |
| Database references | |
| SIMBAD | data |
HD 64440, also known as a Puppis, is a binary star in the constellation Puppis. At a moderate brightness of 3.71, it is visible to the naked eye. [2] Parallax measurements give a distance of 108 parsecs (350 light-years ). [1]
This is a spectroscopic binary of the single-lined type, meaning the spectral lines of only a component can be seen in the spectrum. [7] The primary has a spectral type of K1.5II, [4] which at first would make it a bright giant star, but this classification is unsupported by its relatively small absolute magnitude. [7] The secondary is an early A-type star. [4] They orbit with a period of about 6.13 years and have a high eccentricity of 0.667. [7]
