Epsilon Draconis, Latinized from ε Draconis, is a fourth-magnitude star in the constellation Draco. This star along with Delta Draconis (Altais), Pi Draconis and Rho Draconis forms an asterism known as Al Tāis, meaning "the Goat".^[10]

Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...

Epsilon Draconis

Location of ε Draconis (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Draco
Right ascension	19h 48m 10.34973s[1]
Declination	70° 16′ 04.5329″[1]
Apparent magnitude (V)	3.9974[2]
Characteristics
Spectral type	G7IIIbFe-1[3]
U−B color index	+0.48[4]
B−V color index	+0.88 [4]
Astrometry
Radial velocity (Rv)	+2.69±0.23[5] km/s
Proper motion (μ)	RA: +79.702[1] mas/yr Dec.: +41.078[1] mas/yr
Parallax (π)	21.2526 ± 0.3016 mas[1]
Distance	153 ± 2 ly (47.1 ± 0.7 pc)
Absolute magnitude (MV)	0.71[2]
Details
Mass	2.7[6][7] M☉
Radius	11.15+0.47 −0.56[1] R☉
Luminosity	69.6±1.12[1] L☉
Temperature	4993+129 −103[1] K
Metallicity [Fe/H]	-0.31[8] dex
Rotational velocity (v sin i)	1.2 [6] km/s
Age	500[6] Myr
Other designations
Tyl, ε Dra, 63 Dra, AG+70° 689, BD+69° 1070, GC 27471, HD 188119, HIP 97433, HR 7582, SAO 9540, CCDM J19482+7016AB, PLX 4689, IRAS 19483+7008, 2MASS J19481035+7016045[9]
Database references
SIMBAD	data

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In Chinese astronomy, 天廚 (Tiān Chú), meaning the Celestial Kitchen, refers to an asterism consisting of Epsilon Draconis, Delta Draconis, Sigma Draconis, Rho Draconis, 64 Draconis and Pi Draconis.^[11] Consequently, the Chinese name for Epsilon Draconis itself is 天廚三 (Tiān Chú sān, English: the Third Star of the Celestial Kitchen.)^[12] Most authors do not use a traditional name for this star, using instead the Bayer designation;^[13] but Bečvář (1951) listed it as Tyl /ˈtɪl/.^[14][15]

With a declination in excess of 70 degrees north, Epsilon Draconis is principally visible in the northern hemisphere, with southern locations north of 20° South able to see it just above the horizon. The star is circumpolar throughout all of Europe, China, most of India and as far south as the tip of the Baja peninsula in North America as well as other locations around the globe having a latitude greater than ± 20° North. Since Epsilon Draconis has an apparent magnitude of almost 4.0, the star is easily observable to the naked eye as long as one's stargazing is not hampered by the light pollution common to most cities.

The best time for observation is in the evening sky during the summer months, when the "Dragon constellation" passes the meridian at midnight, but given its circumpolar nature in the northern hemisphere, it is visible to most of the world's inhabitants throughout the year.

Epsilon Draconis is a yellow giant star with a spectral type of G8III. It has a radius that has been estimated at 11 solar radii and a mass of 2.7 solar masses.^[6] Compared to most G class stars, Epsilon Draconis is a relatively young star with an estimated age of around 500 million years old.^[6] Like the majority of giant stars, Epsilon Draconis rotates slowly on its axis with a rotational velocity of 1.2 km/s, a speed which takes the star approximately 420 days to make one complete revolution.^[6]

In 2007, Floor van Leeuwen and his team calibrated the star's apparent magnitude at 3.9974 with an updated parallax of 22.04 ± 0.37 milliarcseconds, yielding a distance of 45.4 parsecs or approximately 148 light years from Earth.^[2] Given a surface temperature of 5,068 Kelvin, theoretical calculations would yield a total luminosity for the star of about 60 times the solar luminosity.

Epsilon Draconis is resolvable as a double star in telescopes of 10 centimeters aperture or larger. The companion has an apparent brightness of 7.3 at an angular distance of 3.2 arcseconds. It is a giant of spectral class F5,^[9] orbiting the yellow giant at about 130 astronomical units.^{[citation needed]}

• Lists of stars in the constellation Draco
• Class G Stars
• Variable star
• Double star