elpajare
Member
Posts: 438
home town/country: Girona-Spain
time zone gmt +/-: 1
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Post by elpajare on Jan 26, 2019 10:16:37 GMT
To observe nebulae and clusters I had always used a refractor but this 6 "RC tube combined with the very sensitive IMX294 chip is giving me very good results. In the same FOV are 3 open clusters: NGC 2467 and Haffner 18 and 19
Visual observing notes from Steve Gottlieb
NGC 2467 = ESO 493-SC25 = Sh 2-311 = Gum 9 = RCW 16 = Ced 103 = LBN 1065/1066/1067
13.1" (1/30/06 - Costa Rica): bright, large nebulosity at 75x using an OIII filter, ~4-5' diameter, surrounding a mag 7.5 star. The main section is roughly mushroom shaped, extending generally south of the bright star. The southern border is locally brighter along a strip oriented NW to SE. There is a sharp light cut-off (apparently due to dust) passing to the north of the central star and oriented E-W. Faint haze extends 15' to 20' to the east towards a 12'-15' string of brighter stars that are oriented NW to SE. The nebulosity brightens and broadens into a 12' stream roughly parallel to this group of brighter stars (Haffner 18). Removing the filter this is a gorgeous low power Milky Way field with numerous faint stars peppered in the region of the nebula.
OMEGON RC +RC IMX294
10x15" +DFC+UV/IR filter
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Post by Dragon Man on Jan 26, 2019 15:13:36 GMT
That's a pretty deep image Carlos. Stars look good.
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elpajare
Member
Posts: 438
home town/country: Girona-Spain
time zone gmt +/-: 1
|
Post by elpajare on Jan 26, 2019 15:44:25 GMT
It is noticeable difference of the Newton. The Ritchey-Chretien do not give aberrations on the edges and the stars are more precise keeping the colors quite well.
With this tube I had the problem of a small FOV but when the new IMX294 chip came out I was able to increase it and keep the exposures low without using field reducers. It's a pretty good combination for clusters and I'm seeing that even for bright nebulae. I was surprised.
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