Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Scorpius |
Right ascension | 16h 03m 20.62179s [1] |
Declination | −25° 51′ 54.8653″ [1] |
Apparent magnitude (V) | 4.973 [2] |
Characteristics | |
Spectral type | K3 III [3] |
B−V color index | 1.245 [3] |
Astrometry | |
Radial velocity (Rv) | −37.88±0.15 [1] km/s |
Proper motion (μ) |
RA: −66.608
[1]
mas/
yr Dec.: −38.657 [1] mas/ yr |
Parallax (π) | 14.3632 ± 0.2020 mas [1] |
Distance | 227 ± 3
ly (69.6 ± 1.0 pc) |
Absolute magnitude (MV) | 0.909 [2] |
Details | |
Mass | 1.25 [3] M☉ |
Luminosity | 61.7 [3] L☉ |
Surface gravity (log g) | 2.29 [2] cgs |
Temperature | 4,370±22 [3] K |
Metallicity [Fe/H] | +0.01 [2] dex |
Age | 4.46 [3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 143787 is a single [5] star in the southern constellation of Scorpius. It is a fifth magnitude star – apparent visual magnitude of 4.973, [2] and hence is visible to the unaided eye. The distance to HD 143787 can be estimated from its annual parallax shift of 14.4 mas, [1] yielding a separation of 227 light years. It is moving closer to Earth with a heliocentric radial velocity of −37.9 km/s, [1] and should come within 106.4 ly in 1.2 million years. [6]
This is an evolved giant star with a stellar classification of K3 III. [3] It is a red clump giant, which means it is on the horizontal branch and is generating energy through helium fusion at its core. [2] At the age of 4.46 [3] billion years, it has 1.25 [3] times the mass of the Sun and is radiating 61.7 [3] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,370 K. [3]