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PostPosted: Thu Aug 29, 2019 3:30 pm 
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Joined: Sun Oct 25, 2009 3:56 pm
Posts: 1321
Location: Caithness
Imaged using the Celestron C8 at f.5 and the Starlight Express SXV-H9C. The Dumbbell was 10x180 secs, NGC 891 7x300 secs +2x600 secs, and IC10 8x300 secs + 2x600 secs.

"NGC 891 is an edge-on unbarred spiral galaxy about 30 million light-years away in the constellation Andromeda. It was discovered by William Herschel on October 6, 1784."

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"Messier 76 (M76), also known as the Little Dumbbell Nebula, is a planetary nebula located in the constellation Perseus. The nebula lies at an approximate distance of 2,500 light years from Earth."

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"IC 10 is a small irregular galaxy in the constellation Cassiopeia at a distance of approximately 2.2 million light years. IC 10's location in the plane of the Milky Way hinders detailed observations as it is heavily obscured by interstellar matter. It is the only known starburst galaxy in the Local Group. Currently the stellar production rate is 0.04 to 0.08 solar masses per year. At this rate, the supply of gas in IC 10 will only last a few billion years longer."

Image

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BRIAN
Celestron Nexstar 8SE, Ioptron CEM 25P mount
Altair Astro 102 ED refractor with Lunt B600 CaK diagonal
Coronado PST DS, Daystar Quark
ZWO ASI120MM camera, Canon 1000D (astro modified), Starlight Express SXV H9-C.
Gallery: http://www.astrobin.com/users/smerral/


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PostPosted: Fri Aug 30, 2019 5:56 pm 
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Joined: Fri Dec 03, 2004 9:58 pm
Posts: 3628
Location: Wellingborough
Very nice images yet again Brian. 8)

Can I ask about the very small diffraction spikes on many of the brightest stars? Just wondering where they are generated in your SCT system? Let me say straight away that I'm not trying to pick fault with these images :)

regards,

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Brian
52.3N 0.6W
Wellingborough UK.

254mm LX90 on Superwedge, WO ZS66SD, Helios 102mm f5 on EQ1, Hunter 11x80, Pentax 10x50
ASI120MC Toucam Pros 740k/840k/900nc mono, Pentax K110D
Ro-Ro roof shed


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PostPosted: Sat Aug 31, 2019 10:11 am 
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Joined: Sun Oct 25, 2009 3:56 pm
Posts: 1321
Location: Caithness
Brian, yes, I've wondered about that myself. I'm guessing it's something to do with the Antares 0.5x reducer as when I use the Celestron reducer I don't see any. Unfortunately the celestron reducer gives me f.8 rather than f.5 which is just a bit too much with this set up. I can live with the odd spike though. :)

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BRIAN
Celestron Nexstar 8SE, Ioptron CEM 25P mount
Altair Astro 102 ED refractor with Lunt B600 CaK diagonal
Coronado PST DS, Daystar Quark
ZWO ASI120MM camera, Canon 1000D (astro modified), Starlight Express SXV H9-C.
Gallery: http://www.astrobin.com/users/smerral/


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