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Eta Cygni (η Cygni) is a star in the northern constellation of Cygnus. It is visible to the naked eye with an apparent visual magnitude of 3.889. [2] The star lies along the main body of the constellation, about midway between Gamma Cygni and Albireo. [9] Based upon an annual parallax shift of 23.55 mas, [1] it is located 138.5 light years ...
The black hole, similar to that of Cygnus X-3, has been hypothesized to be a quark star. [45] 4U 2129+ 47 is another X-ray binary containing a neutron star which undergoes outbursts, [46] as is EXO 2030+ 375. [47] Cygnus is also home to several variable stars. SS Cygni is a dwarf nova which undergoes outbursts every 7–8 weeks. The system's ...
NML Cygni or V1489 Cygni (abbreviated to NML Cyg or V1489 Cyg) is a red hypergiant [4] or red supergiant (RSG) in the constellation Cygnus.It is possibly one of the largest known stars currently known, and is also possibly one of the most luminous and massive cool hypergiants, as well as one of the most luminous stars in the Milky Way.
CH Cygni (CH Cyg / HIP 95413 / BD +49 2999) is a red giant, variable, symbiotic binary in the constellation Cygnus. It is the nearest symbiotic star to Earth, and one of the brightest, making it an ideal candidate for study.
The last spring equinox on March 21 was actually in 2007, according to the Old Farmer's Almanac. This is because the date of the equinox has slipped earlier and earlier each year on the 400-year ...
Meteorological spring kicks off on Friday, March 1, while astronomical spring begins on the equinox, which takes place at 11:06 p.m. EDT on March 19.
Messier 29 or M29, also known as NGC 6913 or the Cooling Tower Cluster, is a quite small, bright open cluster of stars just south of the central bright star Gamma Cygni of a northerly zone of the sky, Cygnus. It was discovered by Charles Messier in 1764, and can be seen from Earth by using binoculars.
What is the official first day of spring? Well, it all depends on where you are. In 2024, the March equinox will occur on Tuesday, March 19, at 11:06 P.M. EST.If you happen to reside in the ...