| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius[1] |
| Right ascension | 16h 03m 20.62179s[2] |
| Declination | −25° 51′ 54.8653″[2] |
| Apparent magnitude (V) | 4.973[3] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | K3 III[4] |
| B−Vcolor index | 1.245[4] |
| Astrometry | |
| Radial velocity (Rv) | −37.88±0.15[2] km/s |
| Proper motion (μ) | RA: −66.608[2]mas/yr Dec.: −38.657[2]mas/yr |
| Parallax (π) | 14.3632±0.2020 mas[2] |
| Distance | 227 ± 3 ly (69.6 ± 1.0 pc) |
| Absolute magnitude (MV) | 0.909[3] |
| Details | |
| Mass | 1.25[4] M☉ |
| Radius | 14.7[5] R☉ |
| Luminosity | 61.7[4] L☉ |
| Surface gravity (log g) | 2.29[3] cgs |
| Temperature | 4,370±22[4] K |
| Metallicity[Fe/H] | +0.01[3] dex |
| Rotational velocity (v sin i) | <1[6] km/s |
| Age | 4.46[4] Gyr |
| Other designations | |
| CD−25°11295,HD 143787,HIP 78650,HR 5969,SAO 184068[7] | |
| Database references | |
| SIMBAD | data |
HD 143787 is a single[8]star in the southernconstellation ofScorpius. It is a fifth magnitude star –apparent visual magnitude of 4.973,[3] and hence is visible to the unaided eye. The distance to HD 143787 can be estimated from its annualparallax shift of14.4 mas,[2] yielding a separation of 227 light years. It is moving closer to Earth with a heliocentricradial velocity of −37.9 km/s,[2] and should come within 106.4 ly in 1.2 million years.[9]
This is anevolvedgiant star with astellar classification of K3 III.[4] It is ared clump giant, which means it is on thehorizontal branch and is generating energy throughhelium fusion at itscore.[3] At the age of 4.46 billion years,[4] it has 1.25 times themass of the Sun[4] and is radiating 61.7 times theSun's luminosity[4] from its enlargedphotosphere at aneffective temperature of 4,370 K.[4]
