Epsilon Scuti

Epsilon Scuti, Latinized from ε Scuti, is a probable astrometric binary ^[9] star system in the constellation Scutum. It is faintly visible to the naked eye with an apparent visual magnitude of +4.88.^[2] Based upon an annual parallax shift of 5.71 mas as seen from Earth,> it is located approximately 570 light years from the Sun. It is moving closer to the Sun with a radial velocity of −9.8 km/s.^[6] Epsilon Scuti was a latter designation of 3 Aquilae.^[10]

ε Scuti

Location of ε Scuti (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Scutum
Right ascension	18h 43m 31.251s[1]
Declination	−8° 16′ 30.77″[1]
Apparent magnitude (V)	4.88[2]
Characteristics
Spectral type	G8IIb[3]
U−B color index	+0.88[4]
B−V color index	+1.12[5]
Astrometry
Radial velocity (Rv)	−9.8±0.6[6] km/s
Proper motion (μ)	RA: +21.781[1] mas/yr Dec.: +4,591[1] mas/yr
Parallax (π)	5.7100±0.1842 mas[1]
Distance	570 ± 20 ly (175 ± 6 pc)
Absolute magnitude (MV)	-1.18[2]
Details
Luminosity	403[2] L☉
Surface gravity (log g)	1.00[7] cgs
Temperature	4,500[7] K
Metallicity [Fe/H]	+0.05[2] dex
Rotational velocity (v sin i)	5.1[8] km/s
Other designations
ε Sct, 3 Aquilae, BD−08°4686, FK5 702, GC 25610, HD 173009, HIP 91845, HR 7032, SAO 142546, ADS 11601, CCDM J18435-0817A, WDS J18435-0817A, GSC 05692-02504
Database references
SIMBAD	data

The visible component is a yellow-hued bright giant with a G-type bright giant^[3] It is radiating 403^[2] times the Sun's luminosity from its photosphere at an effective temperature of 4,500 K.^[7] Epsilon Scuti has at least three faint visual companions, two 14th magnitude stars, B and D, separated from the primary by 13.6 and 15.4 arcseconds respectively, and the 13th magnitude C, which is 38 arcseconds away.^[11]