| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canes Venatici[1] |
| Right ascension | 13h 13m 42.94245s[2] |
| Declination | +40° 09′ 10.3802″[2] |
| Apparent magnitude (V) | 4.94[1] |
| Characteristics | |
| Evolutionary stage | horizontal branch[3] |
| Spectral type | G8.5 III CN0.5[4] |
| B−Vcolor index | 1.061±0.002[1] |
| Astrometry | |
| Radial velocity (Rv) | −22.10±0.14[1] km/s |
| Proper motion (μ) | RA: −51.21[2]mas/yr Dec.: +14.75[2]mas/yr |
| Parallax (π) | 7.10±0.24 mas[2] |
| Distance | 460 ± 20 ly (141 ± 5 pc) |
| Absolute magnitude (MV) | −0.80[1] |
| Details[3] | |
| Mass | 3.17±0.26 M☉ |
| Radius | 22.89±0.85 R☉ |
| Luminosity | 241.7±17.3 L☉ |
| Surface gravity (log g) | 2.23±0.05 cgs |
| Temperature | 4,761±24 K |
| Metallicity[Fe/H] | −0.10±0.10 dex |
| Rotational velocity (v sin i) | 5.8[5] km/s |
| Age | 440±130 Myr |
| Other designations | |
| BD+40°2633,HD 115004,HIP 64540,HR 4997,SAO 44519[6] | |
| Database references | |
| SIMBAD | data |
HD 115004 is a single[7]star in the northernconstellation ofCanes Venatici. It is faintly visible to the naked eye with anapparent visual magnitude of 4.94.[1] Based upon an annualparallax shift of7.10±0.24 mas,[2] it is located around 460 light years from the Sun. The star is moving closer with a heliocentricradial velocity of −22 km/s.[1] HD 115004 will make its closest approach in about 1.7 million years at a separation of around 390 ly (119.45 pc).[1]
This is anevolvedgiant star, most likely (97% chance) on thehorizontal branch,[3] with astellar classification ofG8.5 III CN0.5.[4] The suffix notation indicates a mild overabundance of theCN molecule in thestellar atmosphere. It has an estimated 3.2 times themass of the Sun and, at the age of 440 million years, has expanded to 23 times theSun's radius. The star is radiating around 242 times theSun's luminosity from its enlargedphotosphere at aneffective temperature of 4,761 K.[3]
