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Thread: Pretty much a total wash out

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    Default Pretty much a total wash out



    Yesterday at 4:30am, I came out and found Jupiter shining real bright, but I could also see quite a number of constellations : Leo, Hydra, Gemini, Cancer, Auriga, Monoceros, so I decided to shoot some of those first, with the help of Stellarium. At Cancer,just barely got the Beehive cluster, dismal but identifiable, but missed M67 - just too faint.
    GIMP ORIG1.jpg

    Swung over to Auriga which was more rewarding : Stellarium showed lots of fun stuff between Al Nath & theta Aur, so I aimed roughly in this area, and managed to get M36 - M38, but M37 was the dimmest of the lot, although its magnitude is supposed to be lower than the other 2.
    GIMP ORIG1.jpg

    Stellarium then showed that there was more fun stuff between Alhena in Gemini & Monoceros : Was supposed to have got both the Cone & Rosette nebulae, but I can't them in my pic
    GIMP ORIG1.jpg

    Lastly, at 6am, swung back to Jupiter for a quickie, but could just make out 3 of its moons in the terrible pic. I think Ganymede was pretty close to Jupiter.
    S-P1020624.JPG
    Roger 4.0053N,101.0245E
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    Default Re: Pretty much a total wash out

    Good stuff Roger. You do have the Rosette nebula area, it surrounds the rectangular open cluster at the lower left, which is NGC 2244.
    Raymond Howard
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    Default Re: Pretty much a total wash out

    Thanks Ray,

    So to actually see it in the pic, what would I need to do?
    a) Take more subs
    b) Zoom in further
    c) Increase exposure time

    This is an interim measure until my local dealer signs up with either Skywatcher / Orion and brings in the HEQ5 / Pro (even though I'm kind of keen on the iOptron ZEQ25). In the meantime I've bought the motordrive for my CG3 so hopefully I can piggyback my camera on top of the OTA rings for an increase in exposure time. With this, setup, I'm not expecting anything too fantastic, but if I can double my exposure time at the same focal length, that'd be good enough for the time being.
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    Default Re: Pretty much a total wash out

    Can't help with the AP, still a pure visual boy for now
    Raymond Howard
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    Default Re: Pretty much a total wash out

    To see dimmer objects you'll need a longer exposure time. More subs will help too, as they will increase the signal-to-noise ratio and clean the image up, but more subs with no faint data is still no faint data.

    In my experience, about 30 seconds with a 1000mm focal length is about the longest exposure time you can get with an unguided tracking mount. If your alignment is perfect and your mount is sturdy you can go a little past that, but any small inconsistency will start to cause star trailing. I didn't see what focal length you're shooting at, but shorter lengths will increase this time. Once you get a mount that can be guided, your subs can be of almost unlimited time to bring out the dimmest features available.

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    Default Re: Pretty much a total wash out

    That looks and sounds a lot less than a total washout to me.

    I spend 20 minutes with orion getting my eyes acclimatised before the clouds rolled in and that was that.

    Nick

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    Default Re: Pretty much a total wash out

    I have available to me, a range of 25mm to 900mm (in 35mm Equiv) although these pics were shot from 50mm - 200mm. If I can get 30 seconds at 600mm unguided, I'd be most happy already until the real imaging mount comes by I use the 500 rule, so for 500mm, I use 1 sec, and so on. That's probably why I'm not getting much detail probably, even at ISO1600
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    Default Re: Pretty much a total wash out

    Quote Originally Posted by Grumpy_Git View Post
    That looks and sounds a lot less than a total washout to me.

    I spend 20 minutes with orion getting my eyes acclimatised before the clouds rolled in and that was that.

    Nick
    Well Nick, it's all relative I guess. When astrometry.net tells me I've shot stuff that I can't see, grrrrr
    Roger 4.0053N,101.0245E
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