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Posts posted by nytecam

  1. Brief 35min session last night after dusk curtailed by complete cloudcover in even briefer exposures as shown.  Shot my initial goto fov in Deneb with 50% of 30cm SCT obstructed by dome roof hence magnificant diffration spike!  Records below mag15 - some stars mag marked from my favourite planetarium Megastar running on laptop.

    Next M57 with inset sharpened and IC 1296 field gx marked.  Finally M27 with two field Mira variables marked - DQ Vul records 2-3 mag brighter than visual but blurred due to IR excess via CA from the Meade FR @ f/3.3 onto unfiltered OSC SX Lodestar-Cx2 as prime imager;-) 

    Nytecam in London




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  2. Daft I know but chose last Saturday night [as clear!] to collect a few photons when all hell let loose over my head from my neighbour a few doors away with his warzone blockbusters and had to shelter indoors until all over !    

    Tried for a few objects in Cas in tiny Abell 2 [mag 16 PN] and huge Abell 85 {SN remnant bubble] but nothing for the latter in a longish exposure [for me!] - Wikisky later showed it extremely faint [inset]. Used my obsy 30cm f/3.3 SCT+SX Lodestar-Cx2 OSC camera here in London. Data on images.




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  3. This is my first visit to the Pacman Nebula NGC 281 in Cass. It's too big for my set-up but the brightest region captured last night including the central OC IC 1590 of hot blue stars.  Exposure 150s [5x30s] via my 30cm f/3.3 SCT+SX Lodestar-Cx2. 

    Pacman is a similar HII region to the Eagle Neb M16 with star-forming regions associated with Bok dark nebula that I've marked below from reference to Wikisky/Wikipedia.  Hope it of interest ;-)

    BTW - clear Saturday night clashed with popular bonefire night and had to abandon session when a neighbour a few doors away used my garden to explode his blockbusters overhead - bit like a warzone briefly ! 



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  4. Maybe I am just getting too old, but the fire works nowadays all seem to end with a loud bang. This I find annoying. At times it is like living in a war zone.

    Yep - been there and done that in the London Blitz in the 1940s as a 5yr old but at least all the schools were closed.  

    'Spose nowadays I'd take my iPad and walk with my family to somewhere nice but in those days there was nowhere that safe ;-)  

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  5. November 5th is this coming Friday but around here fireworks are going off most evenings for the last week and usually continue overall for a fortnight with the occasional rocket stick in garden or rooftop !

    Does it inhibit your observing with stuff wizzing above your head ? It's been clear here of late but have been giving it a miss including the recent asteroid pass which is a shame with so few clear evenings in winter :- O


  6. I have the PST CaK scope but can't see anything through it (probably due to yellowing of my cornea) but my grandson in his 20th can view through it successfully. I use a regular digital camera for violet CaK 'viewing' and record but must confess I prefer the PST Ha view :-)


  7. A little experiment, via the OSC Lodestar last night under moonlight, on a few bright stars heavily defocused onto the sensor to sample their colour - they're arranged according to their spectral type BAFGKM from hot to cool which they match quite well for colour.  The exposures very brief eg ~ 1/10sec which also captures the unwanted atmospheric turbulence.  

    Also included is Uranus [in a longer exposure that smooth out turbulence] which seems greenish but is not 'stellar hot' [quite the reverse] due to atmospheric methane absorption of reflective sunlight !



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  8. Hi Rob - I've used my Meade f/3.3 (Japanese) FR successfully on the Lodestar 1/2" sensor with some coma in the extreme corners.

    Results with the new SX Ultrastar 2/3" sensor less successful with coma extending around the whole frame edge to the point the use of this camera curtailed.

    I too suspect that some element in your FR is miss-placed.


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  9. Poor autumn weatherwise but clearish this evening with some haze under a bright gibbous moon but EAA works just about.

    Did the moon as goto target then Uranus [well sats !] then some gx nearby in Psc ending, as here, on colourful M76 Little Dumbbell in Per complete with my "deepsky from the city" + bright gibbous moon icon ;-) 

    The detached side lobes to M76 show well in 3x20s stack and better than my earlier shot in 140s on older Lodestar-C via my 30cm f/3.3 SCT. More pics may follow.



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  10. Deep sky objects due to their faintness need fast optics in VA/EAA to match the typically brief exposures (5s - 60s) and usually achieved via focal reducers in the f/5 - f/3 range. AP, with l-o-n-g exposures typically >20min, is not directly comparable - treat VA/EAA as a different field.

    Personally I use my SCT occasionally at native f/10 on bright and small planetaries but gx always @ f/3.3 irrespective of their size. With the sole exception of M31 most gx fit the 1/2" sensors typically used. M31 best with a fast long camera lens and not a telescope. My deepsky gallery linked below :-)

    Good luck - experiment is the best tutorial:-)


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  11. No need for apologies to visual astronomers - here we want to see more much more and video/electronic assist does that in no small measure even with a smaller scope.

    Good luck and enjoy the ride. I've long confined the EP to history(for deep sky) :-)


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