VV Cephei
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VV Cephei, also known as HD 208816, is an eclipsing binary star system located in the constellation Cepheus, approximately 5,000 light years from Earth. It is both a B[e] star and shell star. VV Cephei is an eclipsing binary with the second longest known period.
Information
Distance to Earth:- 4,892 light years
Distance:- 4900 ly; (1500 pc)
Temperature:- 3,480 ± 176.8 K
Age:- 25 Myr
Coordinates:- RA 21h 56m 39s | Dec +63° 37′ 32″
Constellation:- Cepheus
Luminosity:- 200,000 L☉
Size
VV Cephei A is one of the largest known stars, being a red supergiant. Its diameter is 1,475 times that of the Sun. It is orbited by VV Cephei B, a blue star with 13–25 times the Solar radius.
Colors
red
VV Cephei is an eclipsing binary with the second longest known period. A red supergiant fills its Roche lobe when closest to a companion blue star, the latter appearing to be on the main sequence.
VV Cephei
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Spectral type | M2 Iab |
| U−B color index | +2.07 |
| B−V color index | +1.82 |
Information by Wikipedia
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