- Gamma Draconis
Starbox begin
name=Gamma Draconis Starbox observe
epoch=J2000
ra=17h 56m 36.4s
dec=+51° 29′ 20.3″
appmag_v=2.24
constell=Draco Starbox character
class=K5 III
b-v=1.52
u-b=1.87
variable=? Starbox astrometry
radial_v=-28
prop_mo_ra=-8.52
prop_mo_dec=-23.05
parallax=22.10
p_error=0.46
absmag_v=-1.04 Starbox detail
mass=1.7
radius=50
luminosity=600 | temperature=4,000
metal=?
rotation=<17 km/s.
age=? Starbox catalog
names=Etamin, Etanin, Ettanin, Rastaban, Rasaben,Zenith star, 33 Draconis, HR 6705, BD +51°2282, HD 164058, SAO 30653, FK5 676, HIP 87833.Gamma Draconis (γ Dra / γ Draconis) is a
star in theconstellation Draco. It has the traditional name Eltanin (also Etamin).Eltanin is an orange giant of spectral type K5, lying 148
light years away. Despite itsBayer designation of "gamma," it is actually the brightest star in Draco, outshining Rastaban (Beta Draconis ) by nearly half a magnitude. In fact, the name "Rastaban" was formerly used for Eltanin, and the two terms share an Arabic root meaning "serpent" or "dragon." Its proximity to the point directly overhead of London has also earned it the name "Zenith Star."In 1.5 million years, Eltanin will pass within 28 light years of Earth. At this point it will be the brightest star in the night sky, nearly as bright as
Sirius (assuming its current absolute magnitude does not change).In
1728 , while unsuccessfully attempting to measure theparallax of this star,James Bradley discovered theaberration of light resulting from the movement of the Earth. Bradley's discovery proved Copernicus' theory that the Earth revolved around the Sun.ee also
* Gamma Draconis in fiction
References
Kaler, Jim (2004). [http://www.astro.uiuc.edu/~kaler/sow/eltanin.html "STARS: Eltanin"] . Retrieved July 11, 2005.
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