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Everything posted by lunator
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A few Pegasus doubles
lunator replied to lunator's topic in Observing and Imaging Double and Variable Stars
Hi Spile It's a case of fat finger syndrome 😀. It should read STF2954 a pair with 41" separation. Cheers Ian -
Cheers Rusted I will have a look at that.
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Hi Stu The accepted view is that anything below the Raleigh criteria shouldn't have a clear split, the definition of this is a clear black line separating the stars. You can still resolve pairs at the Dawes limit or below. There are several descriptive terms used such as snowmen, figure of eight. I tend to be more boring and just noted if it is not resolved/resolved or split. Cheers Ian
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A quick pic of STF333 A close pair but fairly evenly matched. This is a quick process from one avi frame converted to Jpeg. Cheers Ian
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Hi Stu Nice investigation In my experience at the resolution ratio of 1 (1.16" for your scope you can see pairs upto 2 magnitude differences. At a resolution ratio of 0.86 (1" in your scope) a delta M of 1,5-1.7 is still possible to see. Conditions have to be right tho' Cheers Ian
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Hi Chris it is a tricky one. I am working out what the scope camera combination can deliver. I managed to get STF333 last night. I will post a pic. Cheers Ian
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I'm a bit old fashioned The capture was in Sharpcap. The stacking is AS3 and processing is Registax 6. cheers Ian
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I have been messing around with the new ZWO ASI178. I chose it for the small pixel size as I have taken images of double before but I am hoping I can push the limits further. I had a quick session last night after a bit of lunar imaging. I have never tried for Theta Auriga but after testing everything on Castor I thought it was worth a try. The set up give me 0.22" per pixel which for deep sky imaging is crazy but by reducin the ROI to 640x480 I could get 60 pps and this allow me to stack in AS3 and crop in GIMP. I am fairly satisfied as a first pass. Hopefully I can get some trickier doubles captured. Cheers Ian
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Still getting to grips with the new ASI178 It is an excellent camers but it does make demands of the scope. Clavius looked good last night. I think I might be able to tease out some more detail but still getting the hang of processing
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Hi William Some good pics there. Cheers Ian
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Danny Good start they are very good images. Cheers Ian
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A few Lyra doubles - 22/11
lunator replied to Mr Spock's topic in Observing and Imaging Double and Variable Stars
Hi Michael nice report A good mix of targets Cheers Ian -
I had a chance to get out for an our on the 21st so had a quick look at a few pegasus doubles. using the OMC250 and the 32mm and baader zoom. STF2818AB Y/B A wide pair with a noticeable difference in magnitude. The primary is yellow-Orange and the secondary blue-grey. Several bright stars in the field. STF2889 Y/B A tight pair with a moderate difference in magnitude. The primary is yellow-orange and the secondary is a blue dot. STF2934 Y/B A tight pair with a moderate difference in magnitude. The primary is yellow. The secondary is a small blue dot. Best view at x140. STF29454 w/w A very wide pair with a slight difference in magnitude. Both stars appear white. A bright star shares the field (HD216698). STF2967 w/b A fairly close pair with a moderate difference in magnitude. The primary is white, the secondary is pale blue. STF2969 w/w A close pair with a samll difference in magnitude. Both stars appears white. Part of a 5 star asterism like a dice pattern. STF2997 w/b A wide pair with a moderate difference in magnitude. The primary is white, the secondary is blue-white. STF3000 w/w A close pair of white stars, fairly evenly matched. Just visible at x70. STF3014 w/b A fairly close pair with a moderate difference in magnitude. The primary is white, the secondary is blue-grey and faint. Cheers Ian
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Dubhe - another really tough one !
lunator replied to John's topic in Observing and Imaging Double and Variable Stars
I have never split this but it is one I should try a bit harder with 😉 I have a look through my spreadsheet and the nearest comparable split I have is with STF2900. At the time it was ~0.7" and the delta M was about 3. The pair are much fainter than Dubhe. It took x450 mag to split. So I think Dubhe may take something similar. Cheers Ian -
The Dog Stars – A tale of Two Pups
lunator replied to Mr Spock's topic in Observing and Imaging Double and Variable Stars
Magnus To give you an idea how difficult Procyon B is have a quick read of this thread https://stargazerslounge.com/topic/374993-one-step-beyond-sirius-procyon/#comment-4065839 Cheers Ian -
Alnitak with ED80
lunator replied to NGC 1502's topic in Observing and Imaging Double and Variable Stars
It is a tough split. I have managed to split it in my 8" Newt and OMC250. It usually took about x188 magnification. I haven't tried my ST80 yet. Cheers Ian -
Polaris and Its Companion
lunator replied to orion25's topic in Observing and Imaging Double and Variable Stars
Hi Reggie Good pic 🙂 Imaging doubles can be fun. Cheers Ian -
Hi Michael I have a very similar set I don't have the 7mm I do have the 5mm. They are superb eyepieces. Cheers Ian
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Hi Dave, I have always felt the 'colours/hues' are definitely affected by type of telescope. The most vivid colours were in my ST120. The most 'natural' colours were in my 200mm F6 newt. I most definitely peferred the view i the latter Cheers Ian
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Hi Stu Yep they look pretty good. 😃 In the 32mm eyepiece you can get about a degree of sky so you can split pairs down to around 2" and get a rich field as well. Cheers Ian
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Hi Paul, I'm glad we agree on the colours 😃 Cheers Ian
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Observing report 21 October The sky was fairly clear. The full Moon was hidden behind some trees and there were a few clouds blowing over. Seeing wasn’t great probably 4/5 and Transparency was being affected by the high cloud and Moon glow. I had decided to have a look at some more doubles in Corona Borealis and Cygnus. Crb Pairs STF2044 A neat pair of orange stars. Easily split at x70. The pair show a small difference in magnitude. STFA29AB A wide pair suitable for binos or small scopes. Fairly evenly matched strong orange colour. The ‘D’ component is a star roughly between them. very faint -grey. STF2011 A close pair of uneven magnitude. The primary is white the secondary is pale blue. split at x70, best view at x150 shares field with orange star (TYC 2041-1219-1). STF2004 A close pair tricky to split in the conditions. The primary is white the secondary blue-grey with a noticeable difference in magnitude. STF1935 A pair of white stars with a moderate difference in magnitude. I was planning to move onto Cygnus but had a quick stop at RS Oph and Jupiter. RS Oph very faint now. Felt slightly strange looking at it through the OMC 250 instead of the ST80. I estimated it at Mag 10.4. Jupiter was fairly good at x70 but seeing still wasn’t great so I moved on. Heading into Cygnus I thought I would stop off at the showpiece double Albireo. Albireo. A gold and blue pair ideal for small scopes. Is it physical or optical, the latest research is optical but I have read what GAIA has reported. STF2522 A close pair with a noticeable difference in magnitude the primary is yellow-white, the secondary is pale blue. Quite a rich-field. STF2538 A visual triple, 'B’ comp is 13th mag. The A, C&D stars are similar in magnitude and white. Chain of stars to the South East. STF2539AC A close pair with noticeable difference in magnitude. The primary is white, the secondary pale blue. 'B' comp not visible. STF2610AB A close pair with a small difference in magnitude. Both stars appear white, w 'W' shaped asterism to the North East. STF2639AB A fairly close pair with a moderate difference in magnitude. The primary is white, secondary orange. A neat colour contrast. Rich-field Cheers Ian
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Eruption of the Recurrent Nova RS Oph!
lunator replied to JeremyS's topic in Observing - Widefield, Special Events and Comets
I had a look last night and it appeared about Mag 10.4. Cheers Ian