NGC 2281 is a bright open star cluster shining at magnitude 5.4, making it an inviting and rewarding target for astrophotographers working with modest apertures. Spanning an angular size of 0.8° (50′), it comfortably fits within the field of view of short focal length refractors and telephoto lenses, leaving room to frame the surrounding star field. Its loose scattering of stars across a true diameter of about 27 light-years renders beautifully in shorter exposures, where the brightest members stand out crisply without overwhelming the fainter ones. A balanced color capture brings out subtle tints across the stellar population, rewarding careful white-balance and gentle stretching during processing.
Names and Catalog numbers
- NGC 2281
- Mel 51 (Melotte 51)
- Cr 116 (Collinder 116)
Position and the cosmic neighborhood
NGC 2281 lies in the northern constellation Auriga at right ascension 06h 48m 21.8s and declination +41° 03′ 36″, placing it high in the winter sky for observers in the northern hemisphere. This generous elevation means the cluster transits near the zenith, where atmospheric extinction is minimal and image quality benefits from the shortest possible path through our atmosphere. Set against the rich star fields along the edge of the winter Milky Way, NGC 2281 sits in a region dotted with bright stars and neighboring clusters, offering plenty of context for wide-field compositions. Its location well away from the celestial equator makes it an excellent choice for long imaging sessions when Auriga rides high overhead during the colder months.
Nice to Know
- At magnitude 5.4, NGC 2281 is bright enough to be glimpsed under dark skies and is an easy, forgiving subject for beginning astrophotographers.
- The cluster carries multiple catalog designations, including Collinder 116, Melotte 51, and NGC 2281, reflecting its inclusion in several historical star-cluster surveys.
- With an angular size of 0.8° (50′), it spans well over the apparent width of the full Moon, ideal for wide-field and short focal length setups.
- Lying roughly 1,820 light-years from Earth, its measured diameter of about 27 light-years gives a tangible sense of scale to this stellar grouping.
Brightness, distance and size
The object has an apparent magnitude of 5.4 mag, it lies about 1,820 light-years from Earth and spans roughly 27 light-years across. On the sky it appears about 0.8° (50′) in size.
