How to Find Caldwell 21

How to Find Caldwell 21

Caldwell 21 Starburst in NGC 4449 (captured by the Hubble Space Telescope).jpg

Caldwell 21, or NGC 4449 is an irregular shaped galaxy found 12 million light years away. It was discovered by Herschel in 1788. It is part of the M94 group of galaxies and forms a bar shape. This galaxy has been heavily studied as it has a similar appearance to the Large Magellenic Cloud which is a satellite galaxy of the Milky Way clearly visible from the Southern hemisphere. 

Image by: NASA, ESA, A. Aloisi (STScI/ESA), and The Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration

Telescopic Image to Scale:


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

Other Names:

Caldwell 21


NGC 4449

UGC 7592

PGC 40973


Magnitude = 9.6

Surface brightness = 13.0

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 galaxy resides in the Canes Venatici constellation. It can be found in the crosshairs on the map below. It's co-ordinates are: RA 12h 28m 51.05 DEC +44° 01′ 08.6″ if you are using guiding software.

How to find Caldwell 21

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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