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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 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.
Right ascension: 18 h 44 m 22.78056 s [1] Declination +39° 36′ 45.7851 ...
NGC 6530 is a young [8] open cluster of stars in the southern constellation of Sagittarius, located some 4,300 light years from the Sun. [3] It exists within the H II region known as the Lagoon Nebula, or Messier 8, [9] and spans an angular diameter of 14.0′. [5]
HD 173416, also named Xihe, is a star with an orbiting exoplanet in the northern constellation of Lyra.It is located at a distance of approximately 433 light years based on parallax measurements, [2] but is drifting closer to the Sun with a radial velocity of −61 km/s. [5]
HD 176051 is a spectroscopic binary star system [12] approximately 49 light years away from Earth in the constellation Lyra.The pair orbit with a period of 22,423 days (61.4 years) and an eccentricity of 0.25. [6]
It now has 18 [6] times the Sun's girth and is radiating 127 [7] times the luminosity of the Sun at an effective temperature of 4,638 K. [8] κ Lyrae is a red clump giant, which means it is on the horizontal branch and is generating energy through core helium fusion. [11] It is a suspected small amplitude variable star. [5]
There are some noteworthy stars in the cluster. HD 172365 [5] is a likely post-blue straggler in the IC 4756 that contains a large excess of lithium. [6] HD 172189, also in IC 4756, is an Algol variable eclipsing binary [7] with a 5.70 day period.
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