V354 Cephei – a red supergiant star

V354 Cephei is a red supergiant star that is 9,000 light-years away from the Sun. It is a very luminous Supergiant Star-type star. It has a diameter that is between 690 and 1,520 times bigger than the Sun. This means it is among the largest known stars. It is an M2.5 IAB supergiant star based on the spectral type that was recorded in Simbad at Strasbourg University. It is in the constellation Cepheus. V354 Cephei has a radius that is 1,520.00 times bigger than the Suns.

V354 Cephei is a red supergiant star located within the Milky Way. It is not part of the Cepheus constellation outline but is within the borders of the constellation. It is an irregular variable located over 8,900 light-years away from the Sun. It is based on the spectral type (M2.5 Iab) of the star, the star’s color is red. It has an estimated radius of 685 solar radii (477,000,000 km; 3.19 au). If it were placed in the center of the Solar System, it would extend between the orbits of Mars and Jupiter. The star can not be seen by the naked eye, you need a telescope to see it.

V354 Cephei is identified as a red supergiant variable star and included on surveys such as IRAS and 2MASS, but prior to its inclusion in the General Catalogue of Variable Stars in 1981, it was referred to only by its listings on relatively obscure catalogs. The location of the supergiant star in the night sky is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. It is too faint to be included in catalogs such as the Henry Draper Catalogue or Bonner Durchmusterung. It was included on a 1947 Dearborn Observatory survey as star 41575, but that ID is hardly ever used.

V354 Cephei is near the Cepheus OB1 stellar association and considered a likely member. Based on the star’s spectral type of M2.5 Iab , V354 Cephei’s color and type is red supergiant star. V354 Cephei Radius has been calculated as being 1,520.00 times bigger than the Sun. The Sun’s radius is 695,800km, therefore the star’s radius is an estimated 1,057,616,000.00.km.

V354 Cephei has an apparent magnitude of 10.82 which is how bright we see the star from Earth. Newer calculations of the luminosity of V354 Cep determined the luminosity of the star to be somewhat much lower, below 80,000 L☉, which implies much smaller sizes below 690 R☉. Apparent Magnitude is also known as Visual Magnitude. A 2011 study notes the discrepancy but is unable to explain it. V354 Cephei is an estimated 9,000.00 light-years from our Solar System (Earth and Sun). There are similar differences in the visual extinctions derived, between two and six magnitudes. Other more recent published data assumes the smaller Gaia distance and hence derives lower luminosities.

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