20 Boötis

20 Boötis
Observation data; Epoch J2000 Equinox J2000
Constellation	Boötes
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	4.84
Characteristics
Evolutionary stage	red clump
Spectral type	K3 III
B−V Template:Engvar	Script error: No such module "val".
Astrometry
Radial velocity (Rv)	Script error: No such module "val". km/s
Proper motion (μ)	RA: –141.521 mas/yr ; Dec.: +60.274 mas/yr
Parallax (π)	17.8379±0.1894 mas
Distance	Template:Rnd ± Template:Rnd ly ; (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	Script error: No such module "val".
Details
Mass	Script error: No such module "val". Template:Solar mass
Radius	Script error: No such module "val". Template:Solar radius
Luminosity	Script error: No such module "val". Template:Solar luminosity
Surface gravity (log g)	Script error: No such module "val". cgs
Temperature	4,472 K
Metallicity [Fe/H]	0.16 dex
Rotation	848 days
Rotational velocity (v sin i)	1.0 km/s
Age	Script error: No such module "val". Gyr
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
	Template:Odlist
Database references
SIMBAD	data

Script error: No such module "Check for unknown parameters".

20 Boötis is a single^[8] star in the northern constellation of Boötes, located 183 light years away from the Sun. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.84.^[1] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.154 arc seconds per annum.^[9] It is moving closer to the Earth with a heliocentric radial velocity of −8 km/s.^[1]

This is an aging K-type giant star with a stellar classification of K3 III.^[4] It is a red clump giant,^[3] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. The star is around five billion years old with 1.1^[5] times the mass of the Sun and has expanded to 12^[2] times the Sun's radius. It is radiating 52^[2] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,472 K.^[5]

References

Script error: No such module "Check for unknown parameters".

Observation data Epoch J2000 Equinox J2000
Constellation	Boötes^[1]
Right ascension	Template:RA^[2]
Declination	Template:DEC^[2]
Apparent magnitude (V)	4.84^[1]
Characteristics
Evolutionary stage	red clump^[3]
Spectral type	K3 III^[4]
B−V Template:Engvar	Script error: No such module "val".^[1]
Astrometry

Radial velocity (R_v)	Script error: No such module "val".^[1] km/s
Proper motion (μ)	RA: –141.521^[2] mas/yr Dec.: +60.274^[2] mas/yr
Parallax (π)	17.8379±0.1894 mas^[2]
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (M_V)	Script error: No such module "val".^[5]

Details^[5]

Mass	Script error: No such module "val". Template:Solar mass
Radius	Script error: No such module "val".^[2] Template:Solar radius
Luminosity	Script error: No such module "val".^[2] Template:Solar luminosity
Surface gravity (log g)	Script error: No such module "val". cgs
Temperature	4,472 K
Metallicity [Fe/H]	0.16 dex
Rotation	848 days^[6]
Rotational velocity (v sin i)	1.0^[6] km/s
Age	Script error: No such module "val". Gyr

Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
Template:Odlist^[7]
Database references
SIMBAD	data