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Over a precession cycle of 26,000 years, "fixed stars" that are far from the ecliptic poles increase in right ascension by 24h, or about 5.6' per century, whereas stars within 23.5° of an ecliptic pole undergo a net change of 0h.
Since the right ascension and declination of stars are constantly changing due to precession, astronomers always specify these with reference to a particular equinox. Historically used Besselian equinoxes include B1875.0, B1900.0, B1925.0 and B1950.0.
Right ascension: 10 h 08 m 12.8/14 s [4] ... so as this cycle continues Venus will more definitely pass Regulus ... Regulus is the brightest star in the constellation ...
Right ascension: 05 h 17 m 23.943 s [7] Declination +45° 50′ 19.84 ... The Brightest Stars: Discovering the Universe through the Sky's Most Brilliant Stars. Wiley.
δ Cassiopeiae (Latinised to Delta Cassiopeiae) is the star's Bayer designation.WDS J01258+6014A is its designation in the Washington Double Star Catalog.. It also bore the traditional names Ruchbah and Ksora; the former deriving from the Arabic word ركبة rukbah meaning "knee", [9] and the latter appeared in a 1951 publication, Atlas Coeli (Skalnate Pleso Atlas of the Heavens) by Czech ...
Lunar occultations of Antares are fairly common, depending on the 18.6-year cycle of the lunar nodes. The last cycle ended in 2010 and the next begins in 2023. Shown at right is a video of a reappearance event, clearly showing events for both components. Antares can also be occulted by the planets, e.g. Venus, but these events are rare.
Two stars in the system can be seen by large telescopes, and the brighter of the two is a spectroscopic binary. These three stars are all blue-white main-sequence stars, each three to four times as massive as the Sun. Rigel and the triple system orbit a common center of gravity with a period estimated to be 24,000 years. The inner stars of the ...
Albireo is the star in the head of the constellation of Cygnus (bottom). β Cygni (Latinised to Beta Cygni) is the system's Bayer designation. The brighter of the two components is designated β¹ Cygni or Beta Cygni A and the fainter β² Cygni or Beta Cygni B. The origin of the star system's traditional name Albireo is unclear.