Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 2h 19m 21.87717s[2] |
Declination | +58° 57′ 40.3455″[2] |
Apparent magnitude (V) | 8.34-9.70[3] |
Characteristics | |
Spectral type | M2Iab[4] |
U−B color index | +2.62[5] |
B−V color index | +2.33[5] |
Variable type | SRc[3] |
Astrometry | |
Radial velocity (Rv) | −40.85[6] km/s |
Proper motion (μ) | RA: −1.237[2] mas/yr Dec.: −0.186[2] mas/yr |
Parallax (π) | 0.4119 ± 0.0237 mas[2] |
Distance | 2345±55[7] pc |
Absolute magnitude (MV) | −6.90±0.07[7] |
Details[7] | |
Mass | 9-12 M☉ |
Radius | 510±20 R☉ |
Luminosity | 45,700+4,400 −4,000 L☉ |
Surface gravity (log g) | 0.06±0.05 cgs |
Temperature | 3,750±60 K |
Metallicity [Fe/H] | −0.35 dex |
Other designations | |
Database references | |
SIMBAD | data |
T Persei is a red supergiant located in the constellation Perseus. It varies in brightness between magnitudes 8.3 and 9.7 and is considered to be a member of the Double Cluster.
T Persei is a member of the Perseus OB1 association around the h and χ Persei open clusters, around 2 degrees north of the centre of the clusters. It is generally treated as an outlying member of the clusters.[8] It lies half a degree away from S Persei, another red supergiant Double Cluster member.
T Per is a semiregular variable star, whose brightness varies from magnitude 8.34 to 9.7 over a period of 2,430 days.[3] Unlike many red supergiants, it does not appear to have a long secondary period.[4][9] It is relatively inactive for the red supergiant star, with low mass loss rate 8×10−6 Solar_mass/year and no detectable dust shell.[10]
The Washington Double Star Catalog lists T Persei as having a 9th magnitude companion 0.1 arc-seconds away. This is derived from Hipparcos measurements. However, no other sources report a companion.[11]