NGC 3187 is a barred spiral galaxy located in the constellation Ursa Major. It is cataloged in the New General Catalogue, a comprehensive list of deep-sky astronomical objects.
Observation and Discovery
NGC 3187 was discovered by French astronomer Édouard Stephan on February 7, 1885, during his observations from the Marseille Observatory. Stephan was known for his meticulous surveys of faint nebulae and galaxies, adding many objects to the scientific record.Characteristics
NGC 3187 is classified as a barred spiral galaxy (type SB(rs)c in the de Vaucouleurs system). This classification indicates the presence of a prominent bar-shaped structure of stars and gas that extends through its central region, from which the spiral arms originate. The "(rs)" indicates a transitional ring-like structure around the bar, and "c" denotes loosely wound spiral arms.Key features and properties of NGC 3187 include:
- Morphology: It exhibits a distinct central bar and two main spiral arms that are actively forming stars, particularly evident in regions of blue young star clusters.
- Distance: Estimates place NGC 3187 at a distance of approximately 60 to 70 million light-years (about 18 to 21 megaparsecs) from Earth.
- Apparent Magnitude: Its apparent visual magnitude is around 13.5, making it a relatively faint object that typically requires a moderate to large aperture telescope for visual observation.
- Angular Size: The galaxy spans an angular size of roughly 2.3 by 1.7 arcminutes across the night sky.
- Other Designations: It is also known by other catalog designations such as PGC 30097 and UGC 5556.
Galactic Environment
NGC 3187 is not an isolated galaxy; it is gravitationally interacting with other galaxies in its local environment. It is considered a member of a small galaxy group, sometimes associated with the larger Ursa Major Cluster, which is part of the Virgo Supercluster. Such gravitational interactions between galaxies can influence their structure, star formation rates, and gas distribution over cosmic timescales.See Also
- New General Catalogue
- Spiral galaxy
- Barred spiral galaxy
- Ursa Major (constellation)