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The Right ascension of the star is about 18 h. 18 h means it is a March early-hours star and in blue sky in the morning. If 12 h RA, the star would be a March all-night star as opposite the March equinox. If 6 h RA the star would be a March late-hours star, at its high (meridian) at dusk.
Right ascension: 18 h 44 m 20.34589 s [1] Declination +39° 40′ 12.4533″ [1] Apparent magnitude (V) 4.66 [2] Epsilon 2 Lyrae: Right ascension: 18 h 44 m 22.78056 s [1] Declination +39° 36′ 45.7851″ [1] Apparent magnitude (V) 4.59 [2] Characteristics ε 1 Lyr Spectral type: A3V + F0V [3] U−B color index +0.065 [2] B−V color index +0 ...
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 ]
UY Scuti (BD-12°5055) is a red supergiant star, located 5,900 light-years away in the constellation Scutum.It is also a pulsating variable star, with a maximum brightness of magnitude 8.29 and a minimum of magnitude 10.56, which is too dim for naked-eye visibility.
This is both because of the fluctuation in inclination mentioned above, and because the moon has to arrive at right ascension 6 hours or 18 hours (90° or 270°). The lining up occurs once every 6798.38 days on average (18.613 Julian years of 365.25 days, or 18 years and 223 or 224 days), although the node undergoes a fluctuation of amplitude 1 ...
The 4U 1820-30 system, consisting of a neutron star and a white dwarf, compared to the Earth and the Sun (bottom). The neutron star is tied with PSR J1748−2446ad as the fastest rotating pulsar known, both making 716 revolutions per second.
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]
18 Delphini, also named Musica / ˈ m juː z ɪ k ə /, [8] [9] is a single [10] star in the constellation of Delphinus of the low northern hemisphere. It has a Sun-like golden hue and is faintly visible to the naked eye with an apparent visual magnitude of 5.506. [ 2 ]