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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 5:39  
clear_day Transit: 12:56  
SunsetSet: 20:14
sunny DaytimeWhat's Visible Now?
All Constellations » Cetus » 

Mira - ο Ceti (omicron Ceti)

Altitude: -5.3°   Azimuth: 271.9°   Direction: West

Mira, also designated as ο Ceti (omicron Ceti), is a variable and multiple giant star in the constellation of Cetus.

Mira visual magnitude is 3.04. Because of its moderate brightness, Mira should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of Mira is -0.008 arcsec per year in Right Ascension and -0.237 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Mira - ο Ceti (omicron Ceti) star
DSS2 image of Mira. The red arrow shows the motion of Mira during the next 1000 years (-0.13 arcmin in Right Ascension and -3.95 arcmin in declination);

Key facts about Mira

3.04
Giant

Mira - ο Ceti (omicron Ceti) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -5.3°
Azimuth: 271.9°
Direction: West

Celestial coordinates and finder chart of Mira

Mira is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Mira are provided in the following table:

02h 19m 20s
-02° 58’ 39”
167.75°
-57.98°
Cetus

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

Finder chart Mira - ο Ceti (omicron Ceti) star
Simplified finder chart for Mira - ο Ceti (omicron Ceti).

Visibility of Mira from your location

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

Today's Mira - ο Ceti (omicron Ceti) rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 93.0°
Max altitude: 35.5°
Azimuth: 267.0°

Distance of Mira from the Sun and relative movement

Mira is distant 418.49 light years from the Sun and it is moving far from the Sun at the speed of 64 kilometers per second.

128.37 pc
418.49 ly
64 km/s
-0.008 arcsec/year
-0.237 arcsec/year

Spectral properties of Mira

Mira belongs to spectral class M7 and has a luminosity class of III corresponding to a giant star.

-2.50
M7III
3918K

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

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

Mira star system properties

Mira is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the Mira double sysyem:

3.04
10.34
7.3
118.7 arcsec

Alternative designations of Mira

Mira
ο Ceti
(omicron Ceti)
SAO129825
SAO129825