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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
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All Constellations » Octans » 

μ2 Octantis (mu2 Octantis)

Altitude: -45.9°   Azimuth: 200.6°   Direction: South-South-West

μ2 Octantis is a double giant star in the constellation of Octans.

μ2 Octantis visual magnitude is 6.55. Because of its reltive faintness, μ2 Octantis should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of μ2 Octantis is 0.141 arcsec per year in Right Ascension and -0.15 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of μ2 Octantis (mu2 Octantis) star
DSS2 image of μ2 Octantis. The red arrow shows the motion of μ2 Octantis during the next 1000 years (2.35 arcmin in Right Ascension and -2.50 arcmin in declination);

Key facts about μ2 Octantis

6.55
Giant

μ2 Octantis (mu2 Octantis) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -45.9°
Azimuth: 200.6°
Direction: South-South-West

Celestial coordinates and finder chart of μ2 Octantis

μ2 Octantis is situated close to the southern celestial pole and, as such, it is easilty visible for most part of the year from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of μ2 Octantis are provided in the following table:

20h 41m 43s
-75° 21’ 02”
318.45°
-33.05°
Octans

The simplified sky map below shows the position of μ2 Octantis in the sky:

Finder chart μ2 Octantis (mu2 Octantis) star
Simplified finder chart for μ2 Octantis (mu2 Octantis).

Visibility of μ2 Octantis from your location

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

μ2 Octantis (mu2 Octantis) is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of μ2 Octantis from the Sun and relative movement

μ2 Octantis is distant 142.05 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

43.57 pc
142.05 ly
-13 km/s
0.141 arcsec/year
-0.15 arcsec/year

Spectral properties of μ2 Octantis

μ2 Octantis belongs to spectral class G5 and has a luminosity class of III corresponding to a giant star.

3.35
G5III
5890K

The red dot in the diagram below shows where μ2 Octantis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of μ2 Octantis. Attribution: Richard Powell / CC BY-SA

μ2 Octantis star system properties

μ2 Octantis 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 μ2 Octantis double sysyem:

6.55
7.15
0.6
17 arcsec

Alternative designations of μ2 Octantis

μ2 Octantis
(mu2 Octantis)
SAO257836
SAO257836