HD 143787

HD 143787 is a single^[8] star in the southern constellation of Scorpius. 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 annual parallax shift of 14.4 mas,^[2] yielding a separation of 227 light years. It is moving closer to Earth with a heliocentric radial velocity of −37.9 km/s,^[2] and should come within 106.4 ly in 1.2 million years.^[9]

HD 143787

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−V color 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

This is an evolved giant star with a stellar classification of K3 III.^[4] It is a red clump giant, which means it is on the horizontal branch and is generating energy through helium fusion at its core.^[3] At the age of 4.46 billion years,^[4] it has 1.25 times the mass of the Sun^[4] and is radiating 61.7 times the Sun's luminosity^[4] from its enlarged photosphere at an effective temperature of 4,370 K.^[4]