How To Find Messier 103

How To Find Messier 103

Messier object 103.jpg

Messier 103 is an open cluster found 10,000 light years away. It was discovered by Mechain in March 1781. It is an easy cluster to observe despite being one of the furthest open clusters from us being visible as a hazy patch in binoculars. It was the last of the objects in Messier’s original list. The most dominant star is the binary Struve 131 but this isn’t a member of the 172 star open cluster.


Telescopic Image to Scale:


This image is the size of a full moon for size comparison.

Other Names:

Messier 103

NGC 581

M 103


Magnitude = 7.4

Surface brightness = 11

Telescope Aperture City Suburbs Rural Dark Sky
4 inches 9 10 11 12.5
5 inches 9.5 10.5 11.5 13
6 inches 10 11 12 13.5
8 inches 10.5 11.5 12.5 14
10 inches 11 12 13 14.5

Use this chart to estimate if you can see the object from your location with your telescope. For more help on using this chart click here.

How to Find It:

This open cluster officially resides in the Cassiopeia Constellation. It's co-ordinates are: RA 23h 41m 04.34 DEC +49° 43′ 09.0″ if you are using guiding software. The image below shows its location in the crosshairs.

How to find Messier 103

To find more space objects have a look at the constellation guide by clicking the link or go back to the list of deep space objects.

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