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)[7] in the constellation of Perseus. It is approximately 1331 light-years away from Earth.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 02h 50m 41.766s[1] |
Declination | +55° 53′ 43.7876″[1] |
Apparent magnitude (V) | 3.79[2] |
Characteristics | |
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: +16.574[1] mas/yr Dec.: −12.709[1] mas/yr |
Parallax (π) | 4.2061 ± 0.3744 mas[1] |
Distance | 780 ± 70 ly (240 ± 20 pc) |
Absolute magnitude (MV) | −4.29[5] |
Details | |
Radius | 134[6] R☉ |
Luminosity | 4,130[6] L☉ |
Temperature | 3,986±170[6] K |
Rotational velocity (v sin i) | 5.8[3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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The two components of Eta Persei itself are designated Eta Persei A (officially named Miram /ˈmaɪræm/, a recent name for the system)[8] and B.