|IC 1805: Open Cluster (Cassiopeia) RA: 02h 32.7m / DEC: +61° 27'.4|
Instrument: 18-inch Obsession
IC 1805 is an open star cluster in Cassiopeia about 5 degrees southeast of 3.4 magnitude Epsilon (45) Cass. My drawing presents a 141X view in the 18-inch Obsession. HD 15558 is the 8.0 magnitude star west and slightly north of center. It's also the brightest of the more than 100 stars in my sketch. The highest concentration of stars in this cluster, also known as Collinder 36, is found east of HD 15558. Some 20 sparklers are scattered within a 5' by 5' area. Many are in the 12th through 14th magnitude range. This cluster is apparently involved with a large bright nebula, Sharpless 2-190, sometimes referred to as the Heart Nebula. Sh 2-190 covers roughly a 100' by 80' area. Although a spiral search of the region with the 18-inch Obsession gives the impression of a very large, nebulous patchwork filling the area, I did not see anything distinctive enough to merit inclusion in my drawing. I did not try the UHC, OIII or H-beta filters to see if they enhanced the visibility of Sh 2-190.
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Revised: January 22, 2006 [WDF]