IC 1795
DSS image of IC 1795
Overlaid DSS image of IC 1795, 60' x 60' with north at top and west to the right

Aladin viewer for the region around IC 1795

Type  Bright Nebula
Magnitude  
Size  20' x 12'
Right Ascension  2h 26'  (2000)
Declination  62° 2' N
Constellation  Cassiopeia
Description  vL, F
Classification  E
Observing Notes

Object Note
Nov 2, 2020    

IC 1795 is a knot of nebulosity ceneter to the east of NGC 896 and likely encompassing Herschel's earlier discovery. It is part of the extensive nebula complex Sharpless 2-190, the Heart Nebula. The entire complex encompassing well over a degree in RA and two degrees in declination.

There are multiple associated catalog numbers encompassing this nebula complex as ever better observations and photography revealed fainter structure. NGC 896 being the bright knot in the northwest reach. IC 1805, the embedded star cluster at the center was first described by E. E. Barnard in the late 1890's. There is also IC 1795, a bright area of emission to the northwestern end of the complex also described by Barnard, and IC 1831, a faint streamer of emission to the northeast discovered by Max Wolfe in 1906.

Harold Corwin

Barnard's RA is marked +-, but still falls well within a large HII region. The position I've measured is for the brightest knot within Barnard's "Patch of nebulosity."

This is not, by the way, the same knot as William Herschel's object that became NGC 896 (which see). That is an even brighter knot to the southwest, pretty well pinned down by at least two positions in William Herschel's papers, the one published in PT, and a second found in Caroline Herschel's "fair copy" of William Herschel's sweeps in the Herschel Archive.

Having said that, I should note that Wolfgang has suggested the two numbers refer to the same object. I am skeptical of that, at least until we can examine Barnard's observation in detail. It is one that he apparently sent directly to Dreyer -- I've found no record of it in any of Barnard's published papers on nebulae.
IC Notes by Harold Corwin
Other Data Sources for IC 1795
Nearby objects for IC 1795
Credits...

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

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IC 1795