V354 Cephei
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 33m 34.643s |
| Declination | +58° 53′ 47.05″ |
| Apparent magnitude (V) | 10.82 to 11.35 |
| Characteristics | |
| Spectral type | M2.5 Iab |
| B−V color index | +3.18 |
| Variable type | LC |
| Astrometry | |
| Distance | ~9,000ly (3,500 pc) |
| Absolute magnitude (MV) | -7.57 (variable) |
| Details | |
| Radius | 1,520 R☉ |
| Luminosity | 76,000 - 369,000 L☉ |
| Surface gravity (log g) | −0.5 cgs |
| Temperature | 3,650 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
V354 Cephei is a red supergiant star located within the Milky Way. It is an irregular variable located approximately 9,000 light-years away from the Sun, and is currently considered one of the largest known stars, with a radius estimate of 1,520 solar radii (1.06×109 km; 7.1 au). If it were placed in the center of the Solar System, it would extend to between the orbits of Jupiter and Saturn.
V354 Cephei is now clearly 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. 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 Cep has frequently been referred to as Case 75. This is from one of several listings of cool stars made using the Burrell Schmidt telescope at the Warner and Swasey Observatory of Case Western Reserve University, although Case 75 is mistakenly identified as the nearby F3V star BD+58°2450.
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