Miram - η Persei (eta Persei)

Miram, also designated as η Persei (eta Persei), is a multiple supergiant star in the constellation of Perseus.

Miram visual magnitude is 3.76. Because of its moderate brightness, Miram should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about Miram:

Color of Miram ⬤

Magnitude of Miram 3.76

Class Supergiant

VISIBILITY RIGHT NOW Miram - η Persei (eta Persei) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 58°.

Celestial coordinates and finder chart of Miram

Miram is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Miram are provided in the following table:

Right Ascension J2000 02h 50m 41s

Declination J2000 +55° 53’ 44”

Galactic Longitude 139.14°

Galactic Latitude -3.18°

Constellation Perseus

The simplified sky map below shows the position of Miram in the sky:

Finder chart Miram - η Persei (eta Persei) star

Simplified finder chart for Miram - η Persei (eta Persei).

Visibility of Miram from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Miram - η Persei (eta Persei) is circumpolar and transits at 14:55 UTC (altitude: 85.6°)

Digitized Sky Survey image of Miram

The image below is a photograph of Miram from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of Miram is 0.017 arcsec per year in Right Ascension and -0.014 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Miram - η Persei (eta Persei) star

DSS2 image of Miram. The red arrow shows the motion of Miram during the next 10000 years (2.83 arcmin in Right Ascension and -2.33 arcmin in declination);

Distance of Miram from the Sun and relative movement

Miram is distant 1,330.61 light years from the Sun and it is moving towards the Sun at the speed of 1 kilometers per second.

Distance (parsec) 408.16 pc

Distance (light year) 1,330.61 ly

Heliocentric radial velocity -1 km/s

Proper Motion RA 0.017 arcsec/year

Proper Motion Dec -0.014 arcsec/year

Spectral properties of Miram

Miram belongs to spectral class K3 and has a luminosity class of I corresponding to a supergiant star.

Absolute magnitude -4.29

Spectral Type K3I

Color Index (B-V) 1.68

Temperature of Miram 3541K

The red dot in the diagram below shows where Miram is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of Miram. Attribution: Richard Powell / CC BY-SA

Miram star system properties

Miram is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the Miram double sysyem:

Main star magnitude 3.76

Secondary star magnitude 8.46

Magnitude difference 4.7

Separation 28.3 arcsec

Alternative designations of Miram

Proper Name Miram

Bayer designation η Persei
(eta Persei)

Flamsteed designation 15 Persei

Henry Draper Catalogue HD17506

SAO Catalogue SAO23655

Hipparcos Catalogue HIP13268

Durchmusterung Catalogue BD+55 714

FK5 Catalogue 99

Aitken Double Star Catalogue ADS2157

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