Eta Scuti

η Scuti

Template:Location mark Location of η Scuti (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Scutum
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	4.83
Characteristics
Evolutionary stage	horizontal branch
Spectral type	K1-III
U−B Template:Engvar	+1.02
B−V Template:Engvar	+1.08
Astrometry
Radial velocity (Rv)	km/s
Proper motion (μ)	RA: +61.545 mas/yr Dec.: −41.429 mas/yr
Parallax (π)	15.2960±0.1740 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	0.87
Details
Mass	1.50 Template:Solar mass
Radius	Template:Solar radius
Luminosity	Template:Solar luminosity
Surface gravity (log g)	2.54 cgs
Temperature	K
Metallicity [Fe/H]	−0.03 dex
Rotational velocity (v sin i)	< 1.0 km/s
Age	2.8 Gyr
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
Template:Odlist
Database references
SIMBAD	data

Eta Scuti, Latinized from η Scuti, is a single star in the southern constellation of Scutum, near the constellation border with Aquila. Eta Scuti was a latter designation of 9 Aquilae before the official constellation borders were set in 1922. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of +4.83. This object is located approximately 213 light-years from the Sun based on parallax, and is moving closer with a radial velocity of −92 km/s.

This is an aging giant star with a stellar classification of K1-III. After exhausting the supply of hydrogen at its core, the star cooled and expanded until currently it has 12 times the girth of the Sun. It is a red clump giant, which indicates it is presently on the horizontal branch and is generating energy through core helium fusion. The star is about 2.8 billion years old with 1.5 times the mass of the Sun. It is radiating 63 times the Sun's luminosity from its swollen photosphere at an effective temperature of .