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Vega's proper motion is 202.03 ± 0.63 milliarcseconds (mas) per year in right ascension—the celestial equivalent of longitude—and 287.47 ± 0.54 mas/y in declination, which is equivalent to a change in latitude. The net proper motion of Vega is 327.78 mas/y, [83] which results in angular movement of a degree every 11,000 years.
The right ascension of Polaris is increasing quickly—in AD 2000 it was 2.5h, but when it gets closest to the north celestial pole in 2100 its right ascension will be 6h. The North Ecliptic Pole in Draco and the South Ecliptic Pole in Dorado are always at right ascension 18 h and 6 h respectively.
In the equatorial coordinate system, the right ascension coordinates of these borders lie between 18 h 14 m and 19 h 28 m, while the declination coordinates are between +25.66° and +47.71°. [12] The International Astronomical Union (IAU) adopted the three-letter abbreviation "Lyr" for the constellation in 1922. [13]
The primary is an A-type main sequence star, [19] and the secondary has half the mass of the Sun. [18] η Aql is a yellow-white-hued supergiant star, 1200 light-years from Earth. Among the brightest Cepheid variable stars , it has a minimum magnitude of 4.4 and a maximum magnitude of 3.5 with a period of 7.2 days. [ 1 ]
Right ascension: 18 h 44 m 20.34589 s [1] Declination +39° 40′ 12.4533 ... both binaries have moved only a few degrees in position angle. The component stars of ...
Many Right Ascension setting circles therefore carry two sets of numbers, one showing the value if the telescope is aligned in the northern hemisphere, the other for the southern. Even with some inaccuracies in polar alignment or the perpendicularity of the mount, setting circles can be used to roughly get to a desired object's coordinates ...
In the equatorial coordinate system, the right ascension coordinates of these borders lie between 18 h 57.2 m and 20 h 20.5 m, while the declination coordinates are between 16.08° and 21.64°. [ 4 ] Notable features
Right ascension is usually measured in sidereal hours, minutes and seconds instead of degrees, a result of the method of measuring right ascensions by timing the passage of objects across the meridian as the Earth rotates. There are 360° / 24 h = 15° in one hour of right ascension, and 24 h of right ascension around the entire ...