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Draco : The constellation
Transcript of Draco : The constellation
Constellation Did you know that Draco is Latin for dragon? Well, it is, so just deal with it. By : Drew
Skywalker There are many myths about Draco, but
I will just tell the Greco- Roman legend.
The legend is that he was one of the Giant Titans that fought the Olympic Gods for ten years. Major The declination of Draco is +65° and the right ascension of him is 17 h.
Declination is the angular distance of a celestial body north or south of the celestial equator. It is measured in degrees (+65°). It is used with right ascension to specify positions on the celestial sphere.
Right ascension is the equatorial coordinates specifying the angle from the vernal equinox to the intersection of the hour circle that passes through an object in the sky. It is measured eastward along the celestial equator. It is usually expressed in hours, minutes, and seconds (17 h). It is used with declination to specify positions on the celestial sphere. Draco is visible at latitudes between +90° and −15°.
He is best visible at 21:00 (9 p.m.) during the month of July, but is visible year-round in the Northern Hemisphere. The legend says that the goddess Minerva killed him, threw him into the air, and when she threw him he twisted and froze at the North Celestial Pole before he could untwist himself. Celestial
Sphere Click on this for animation.
http://en.wikipedia.org/wiki/File:Ra_and_dec_demo_animation_small.gif Star Data : The two stars that I have chosen are Eltanin or Etamin and Aldhibain. Gamma Draconis (Y Dra, Y Draconis) is the Bayer designation for Eltanin or Etamin. The Flamsteed designation of this star is 33 Draconis. Eta Draconis (n Dra, n Draconis) is the Bayer designation for Aldhibain.
The Flamsteed designation of this star is 14 Draconis. Eltanin or Etamin Aldhibain Distance from Earth Eltanin or Etamin's distance
from Earth is 154.3 light-years (47.3 parsecs) away. Location This star is at (right ascension) 17h 56m 36.36988s and (declination) 51° 29' 20.0242". Magnitude Absolute: Apparent: This star's absolute magnitude
is −1.93 ± 0.07. This star's apparent magnitude
is 2.3617. Type of Star This star is an evolved giant star. Distance from Earth Aldhibain's distance from Earth is 92.1 light-years (28.2 parsecs) away. Location This star is at (right ascension) 16h 23m 59.48594s and (declination) +61° 30' 51.1699". Magnitude Absolute: Apparent: This star's absolute magnitude is +0.58. This star's apparent magnitude is +2.73. Type of Star This star is a evolved giant star that has exhausted the supply of hydrogen at its core. The end