Eta Persei

η Persei
Location of η Per (circled)
Observation data
Epoch J2000      Equinox J2000
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]
Distance1,000 ± 60 ly
(310 ± 20 pc)
Absolute magnitude (MV)−4.29[5]
Details
Mass8±0.4[6] M☉
Radius173.1+9.69
−10.8[7] R☉
Luminosity7,508±864[7] L☉
Surface gravity (log g)0.26[7] cgs
Temperature4082±30[7] K
Rotational velocity (v sin i)5.8[3] km/s
Age37.8±6.2[6] Myr
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
SIMBADdata

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]

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.

  1. ^ a b c d e Cite error: The named reference DR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference ducati was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference cat was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference kinematics was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference ryon was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference runaway was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference npoi was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference WDS was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference IAU-LSN was invoked but never defined (see the help page).