Eta Persei
Star system in the constellation Perseus / From Wikipedia, the free encyclopedia
Eta Persei (η Persei, abbreviated Eta Per, η Per), is a binary star and the 'A' component of a triple star system (the 'B' component is the star HD 237009)[8] in the constellation of Perseus. Parallax measurements by the Gaia spacecraft imply that it is 1,000 is light-years away from Earth.[1] At such distance, interstellar dust diminishes its apparent brightness by 0.47 magnitudes.[7]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Perseus |
Right ascension | 02h 50m 41.810s[1] |
Declination | +55° 53′ 43.80″[1] |
Apparent magnitude (V) | 3.79[2] |
Characteristics | |
Evolutionary stage | Red supergiant |
Spectral type | K3 Ib[3] |
U−B color index | +1.90[2] |
B−V color index | +1.69[2] |
Astrometry | |
Radial velocity (Rv) | −1.07±0.27[4] km/s |
Proper motion (μ) | RA: +16.346 mas/yr[1] Dec.: −13.518 mas/yr[1] |
Parallax (π) | 3.2657 ± 0.1873 mas[1] |
Distance | 1,000 ± 60 ly (310 ± 20 pc) |
Absolute magnitude (MV) | −4.29[5] |
Details | |
Mass | 8±0.4[6] M☉ |
Radius | 173.1+9.69 −10.8[7] R☉ |
Luminosity | 7,508±864[7] L☉ |
Surface gravity (log g) | 0.26[7] cgs |
Temperature | 4082±30[7] K |
Rotational velocity (v sin i) | 5.8[3] km/s |
Age | 37.8±6.2[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Close
The two components of Eta Persei itself are designated Eta Persei A (officially named Miram /ˈmaɪræm/, a recent name for the system)[9] and B.