Caldwell 49
A Stunning Example of a Spiral Galaxy in Pegasus
Caldwell 49, also known as NGC 7640, is a spiral galaxy located in the constellation Pegasus. With its bright core and distinct spiral structure, it presents an excellent object for both amateur and professional astronomers to observe and photograph. Its beauty is complemented by its relatively close distance to Earth, making it a prominent feature in the night sky.
Key Facts
Distance from Earth
approximately 85 million light-years
Diameter
about 100,000 light-years
Apparent Magnitude
13.1 (requires a telescope to see)
Constellation
Pegasus
Type
Spiral Galaxy
Best Season
Caldwell 49 is best viewed from late summer to early winter (August to December), when it reaches its highest point in the night sky.
How to Find It
To locate Caldwell 49, first find the Great Square of Pegasus, which consists of four bright stars forming a square in the sky. From the northeastern star of the square (Alpha Pegasi), move slightly south and east. Caldwell 49 is located about 5° southeast of Alpha Pegasi, just outside the square's outline.
Observing Tip
When observing Caldwell 49, use a telescope with a minimum aperture of 6 inches for a clearer view of its core and spiral structure. Averted vision can help reveal details that are difficult to see directly. For astrophotography, longer exposures with a moderate ISO setting can capture more of its faint details against the surrounding sky.