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V1500 Cygni
Star in the constellation Cygnus / From Wikipedia, the free encyclopedia
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V1500 Cygni or Nova Cygni 1975 was a bright nova occurring in 1975 in the constellation Cygnus. It had the second highest intrinsic brightness of any nova of the 20th century, exceeded only by CP Puppis in 1942.[10]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cygnus |
Right ascension | 21h 11m 36.5810s[1] |
Declination | +48° 09′ 01.952″[1] |
Apparent magnitude (V) | 1.69 to <21[2] |
Characteristics | |
Variable type | Fast nova[2] + asynchronous polar[3] |
Astrometry | |
Proper motion (μ) | RA: −6.449(131) mas/yr[1] Dec.: −5.572(112) mas/yr[1] |
Parallax (π) | 0.6427 ± 0.1087 mas[1] |
Distance | approx. 5,100 ly (approx. 1,600 pc) |
Absolute magnitude (MV) | −10.7 (maximum)[4] to +7.8 (minimum)[5] |
Details | |
WD | |
Mass | 1.20[6] M☉ |
Radius | 0.009[7] R☉ |
Luminosity | 5[7] L☉ |
Temperature | 54,000[5] K |
donor | |
Mass | ~0.22[8] M☉ |
Radius | 0.42[5] R☉ |
Temperature | 3,000 - 5,200[5] K |
Other designations | |
Database references | |
SIMBAD | data |
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/1/17/V1500.Cyg.JD2442500-2444500.LightCurve.png/640px-V1500.Cyg.JD2442500-2444500.LightCurve.png)
V1500 Cygni was discovered shining at an apparent brightness of magnitude 3.0 by Minoru Honda of Kurashiki, Japan on 29 August 1975.[11] It had brightened to magnitude 1.7 on the next day, and then rapidly faded. It remained visible to the naked eye for about a week, and 680 days after reaching maximum the star had dimmed by 12.5 magnitudes.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d8/V1500CygLocation.png/640px-V1500CygLocation.png)
It is an AM Herculis type star, consisting of a red dwarf secondary depositing a stream of material onto a highly magnetized white dwarf primary. The distance of the V1500 Cygni was calculated in 1977 by the McDonald Observatory at 1.95 kiloparsecs (6,360 light years).[12] More recently the Gaia space observatory determined a distance of approximately 5,100 light years.[1] Additionally, V1500 Cyg was the first asynchronous polar to be discovered. This distinction refers to the fact that the white dwarf's spin period is slightly different from the binary orbital period. [13] However, by 2016, x-ray observations strongly suggested that the white dwarf rotation had returned to normal synchronization with the orbit.[4]