Eta Persei

η Persei
	Location of η Per (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Perseus
Right ascension	02h 50m 41.766s
Declination	+55° 53′ 43.7876″
Apparent magnitude (V)	3.79
Characteristics
Spectral type	K3 Ib
U−B color index	+1.90
B−V color index	+1.69
Astrometry
Radial velocity (Rv)	−1.07 ± 0.27 km/s
Proper motion (μ)	RA: +16.574 mas/yr ; Dec.: −12.709 mas/yr
Parallax (π)	4.2061 ± 0.3744 mas
Distance	780 ± 70 ly ; (240 ± 20 pc)
Absolute magnitude (MV)	−4.29
Details
Radius	134 R☉
Luminosity	4,130 L☉
Temperature	3,986±170 K
Rotational velocity (v sin i)	5.8 km/s
Other designations
	Miram, η Persei, η Per, Eta Per, 15 Persei, BD+55 714, CCDM J02506+5553A, FK5 99, GC 3390, HD 17506, HIP 13268, HR 834, IDS 02434+5529 A, PPM 28039, SAO 23655, WDS J02507+5554A
Database references
SIMBAD	data

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) in the constellation of Perseus. It is approximately 1331 light-years away from Earth.

The two components of Eta Persei itself are designated Eta Persei A (officially named Miram /ˈmaɪræm/, a recent name for the system) and B.

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