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Star Spikes and Rotation

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DkN

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Giant Molecular Cloud (GMC)

Posts: 1390

Joined: Mon Dec 30, 2013 3:17 pm

Location: Charlotte, NC

Post Fri Aug 25, 2017 9:17 am

Star Spikes and Rotation

For this with a reflecting scope that will show star spikes. If you have to come back to finish data aquisition over multiple nights do you precisely rotate your focuser to match previous aquired subs? I've gotten my first night of subs on my RC and was delighted by the spikes in bright stars. I only got Lum and a few Red. Now when I go back for more I'll have to ensure that I match the rotation so the spikes overlay. Anybody do this or just not worry about it?
Jeff

SV80ST w/ Moonlite CFL
GSO6RC w/ Moonlite CSL
ATIK 460EX mono Starlight Xpress Lodestar SX OAG & FW
Astronomik LRGB +Ha 12nm OIII 12nm SII 12nm IDAS LPS P2
SGP, EQMOD, PI, PS
Boxes of DIY
Image
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Rudeviewer

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Nuclear Fusion

Posts: 2209

Joined: Thu Feb 27, 2014 1:29 pm

Location: Julesburg, Colorado

Post Fri Aug 25, 2017 9:26 am

Re: Star Spikes and Rotation

If you didnt move your imaging train you should be ok. If it's close it should be taken care of when you align and stack, you may lose a small mount on the outside edges due to that small rotational difference.
Zach
Astro-Physics MACH1 GTO
Williams Optics GT81
Astro-Tech 8" RC
WO .8x Reducer/Flattener
ATIK 383l+ Mono
SXFW v2 USB
Baader RGB/Narrowband filters
Lodestar x2
Orion Thin Off-Axis Guider
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DkN

User avatar

Giant Molecular Cloud (GMC)

Posts: 1390

Joined: Mon Dec 30, 2013 3:17 pm

Location: Charlotte, NC

Post Fri Aug 25, 2017 9:34 am

Re: Star Spikes and Rotation

I have to rotate my focuser to make it fit the case. So yes anytime I year it down there will be changes. What do you mean by lose some on outside edges?

Edit: I think this is a moot point. The star spikes will stay in relation to the stars not the focuser. For example on my old Newt, which was sitting in clamshell rings if you rotated the scope in the rings it would change the direction that the spikes travel to. Whereas in it RC's the dovetails are bolted to the OTA and the spikes will always radiate in the same direction.

Duh.
Jeff

SV80ST w/ Moonlite CFL
GSO6RC w/ Moonlite CSL
ATIK 460EX mono Starlight Xpress Lodestar SX OAG & FW
Astronomik LRGB +Ha 12nm OIII 12nm SII 12nm IDAS LPS P2
SGP, EQMOD, PI, PS
Boxes of DIY
Image
<<

Rudeviewer

User avatar

Nuclear Fusion

Posts: 2209

Joined: Thu Feb 27, 2014 1:29 pm

Location: Julesburg, Colorado

Post Fri Aug 25, 2017 9:44 am

Re: Star Spikes and Rotation

Yes, Exactly.
Zach
Astro-Physics MACH1 GTO
Williams Optics GT81
Astro-Tech 8" RC
WO .8x Reducer/Flattener
ATIK 383l+ Mono
SXFW v2 USB
Baader RGB/Narrowband filters
Lodestar x2
Orion Thin Off-Axis Guider

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