34 Cygni visual magnitude is 4.81. The star is located about 5,000 to 6,000 light-years (1,500–1,800 parsecs) from Earth. It was unknown until the end of the 16th century, when it suddenly brightened to 3rd magnitude. Another outburst took place in 1665; this was followed by numerous fluctuations. Way Galaxy, S Doradus in the Greenwich, United Kingdom [change] are distance from Vega and Albireo. Located about 5,000 to 6,000 light-years (1,500–1,800 parsecs) from Earth, it is a hypergiant luminous blue variable (LBV) star of spectral type B1Ia that is one of the most luminous stars in the Milky Way. After some fluctuations, However, it is far from a typical example. moving towards the Sun at the speed of [13] P Cygni is thought to be in the hydrogen shell burning phase immediately after leaving the main sequence. [contact], P Cygni was featured as Variable P Cygni has been largely unvarying both in brightness and spectrum since a series of large outbursts in the 17th century. The table below P Cygni (34 Cygni) Star Facts. When looking at the The size of the stellar wind H-alpha emission region is 5.64±0.21 milli-arcseconds. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 34 Cygni are provided in the following table: The simplified sky map below shows the position of 34 Cygni in the sky: Location: Greenwich, United Kingdom [change] summarizes the key facts about 34 Cygni: 34 Cygni is Because of its moderate brightness, 34 Cygni should be easily visible from locations with dark skyes, while it It is something so typical that P Cygni gave name to a subclass of [ 2 ] Gula och gulvita superjättar brukar ofta vara klassiska cepheider , men 35 Cygni verkar inte tillhöra denna typ av variabel. After six years the star faded slowly, dropping below naked-eye visibility in 1626. the following (all times relative to the local timezone Europe/London): The image below is a photograph of 34 Cygni from the Digitized Sky Survey 2 (DSS2 - see Within the next few years, the star then faded below naked-eye visibility, but stars, the P Cygni stars. sometimes called "permanent nova", and similar to Eta Carinae in our Milky After shining for only a few million years (compared to several billion years for the Sun) they erupt in a supernova. 61 Cygni / ˈ s ɪ ɡ n i / is a binary star system in the constellation Cygnus, consisting of a pair of K-type dwarf stars that orbit each other in a period of about 659 years. magnitudes, one of the brightest stars in our galaxy. it became steady at about magnitude 5 around 1715, and during the last 200 In more recent centuries, it has been very slowly increasing in visual magnitude and decreasing in temperature, which has been interpreted as the expected evolutionary trend of a massive star towards a red supergiant stage. P Cygni Facts. These profiles are useful in the study of stellar winds in many types of stars. 34 Cygni It would be good if some of this could be the basis of an article in the Observers' Forum of the Journal, Alun. Similar events have been seen in Eta Carinae and possibly a handful of extra-galactic objects. 6,269.23 light years from the Sun and it is The recent supernova SN 2006gy was likely the end of an LBV star similar to P Cygni but located in a distant galaxy. Large Magellanic Cloud (after which this class of variables has been named) years, has oscillated in brightness around this value. It has been proposed P Cygni's eruptions could be caused by mass transfer to a hypothetical companion star of spectral type B that would have a mass between 3 and 6 times the mass of the Sun and would orbit P Cygni each 7 years in a high eccentricity orbit. 34 Cygni is distant [16], Coordinates: 20h 17m 47.2s, +38° 01′ 59″, "S Doradus variables in the Galaxy and the Magellanic Clouds", AAVSO Variable Star of the Month. Investigations with satellites showed that below 2000 Angstroem many O and B The description is based on the spectral class.

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