Zeta UMa Observatory

Sh2-171, Ced 214

El primer gran estudio de regiones HII en el hemisferio norte fue publicado por Stewart Sharpless en 1953. A diferencia de los estudios realizados en el hemisferio sur, Sharpless no realizó sus propias imágenes, sino que usó fotografías existentes, tomadas con filtros rojos, con el telescopio Schmidt de 48 pulgadas del Monte Palomar. El primer catálogo contenía 142 nebulosas. Sharpless revisó este catálogo usando tomas adicionales hechas con el mismo telescopio y publicó su segundo y definitivo catálogo de 313 nebulosas en 1959. The first major HII region survey for the northern hemisphere was published by Stewart Sharpless in 1953. Sharpless was based at the US Naval Observatory in Flagstaff, Arizona. Unlike the surveys done in the southern hemisphere, Sharpless did not create his own images but instead used existing red-filtered photographs taken using the 48 inch Schmidt telescope on Palomar Mountain, southeast of Los Angeles. The first Sharpless catalog contained 142 nebulae. Sharpless revised his first catalog using additional plates (also acquired from the 48 inch Schmidt telescope on Palomar Mountain) produced for the National Geographic - Palomar Sky Atlas (usually called POSS-I). He published his second and final catalog of 313 nebulae in 1959. Ced: catálogo de nebulosas difusas, de S. Cederblad, 1946. Ced: S. Cederblad, 1946. Catalog of Bright Diffuse Galactic Nebulae.
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