Another version of this group using my new CMOS camera.

Used the new version of StarXterminator (2.0.1 AI 11- full AI).  Very slow but you can use now faster AIs, but the star correction is excellent... also is the destarring. 

Previous version with 7+h on CCD. 


Sh2 154 HA RGB

Discussion of GHS aspects of processing:

GHS Forum Discussion

From GalaxyMap:

Sh 2-154 is ionised by the B0 III giant LS III +60 28, according to Avedisova. She places the nebula in the star formation region SFR 108.96+1.59 along with a molecular cloud.

According to a 2000 paper, radiation from stars associated with Sh 2-154 may be accelerating a giant molecular cloud that appears to contain 700 solar masses of carbon monoxide and perhaps 10 thousand solar masses in total viral mass.

The molecular cloud mentioned by Avedisova in association with Sh 2-154 appears to be [YDM97] CO 45 from the position and bibliographic reference she provides. However this cloud, which contains 200 solar masses of radioactive 13CO, has an estimated distance of 730 parsecs. [1] This may be a case where the photometric distance to the ionising star is larger than the kinematic distance of the surrounding gas.

Sh 2-154 is associated with a giant molecular cloud that appears to contain 700 solar masses of carbon monoxide and perhaps 10 thousand solar masses in total (viral mass). It is possible that this cloud is found within the Cepheus molecular clouds and only appears to be further away because the gas has been accelerated by star formation within the cloud.[2] 1. ^ Yonekura, Yoshinori, Dobashi, Kazuhito, Mizuno, Akira, et al. (1997). "Molecular Clouds in Cepheus and Cassiopeia", The Astrophysical Journal Supplement Series, Vol. 110, 21. [1997ApJS..110...21Y]  2. ^ Ungerechts, H., Umbanhowar, P., & Thaddeus, P. (2000). "A CO Survey of Giant Molecular Clouds near Cassiopeia A and NGC 7538", The Astrophysical Journal, Vol. 537, 221-235. [2000ApJ...537..221U]
GENERAL NOTE ON SHARPLESS2 OBJECTS>>>>>>>>>>>>>

There are 313 Sh2 objects.  All now imaged.

This is my collection:

Sharpless2

Wide-Angle Hydrogen Alpha Nikon Image Sh2 79-171

Please note there is also a Sharpless2 Group with now more than 2700 examples.

Sharpless2 Group

Other useful links include:

Gary Imm's Collection

GalaxyMap's Collection

The Sharpless Catalog

The MDW H-alpha Sky Survey

Reiner Vogel's detailed observing catalog

Hope you enjoy these obscure but interesting objects...