Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.


Search the Community

Showing results for tags 'h-alpha'.

More search options

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


  • Welcome
    • Welcome
  • Beginners
    • Getting Started General Help and Advice
    • Getting Started Equipment Help and Advice
    • Getting Started With Observing
    • Getting Started With Imaging
  • Community
    • Official SGL Announcements and Events
    • StarGaZine
    • SGL Challenges and Competitions
    • SGL Star Parties
    • Star Parties & Astro Events
    • Celestial Events Heads Up
    • The Astro Lounge
  • Retailers
    • Sponsor Announcements and Offers
    • FLO Clearance Offers
    • IKI Observatory
    • Supplier Reviews
  • Astro Classifieds
    • For Sale / Swap
    • Wanted
  • Equipment
  • Observing
  • EEVA (Electronically Enhanced Visual Astronomy)
  • Imaging
  • Science
  • WADAS's WADAS Discussion Forum
  • Beaufort Club's Topics
  • Swindon Stargazers Club's Topics
  • East Midlands Stargazers''s Topics
  • Central Scotland Astro's Topics
  • SGL Cumbrian Skies's Topics
  • Herts, Beds and Bucks Group's Topics
  • SGL East Anglian Group's Topics
  • South Leicester Observers's Topics
  • South Wales Group's Topics
  • SGL Surrey Observers's Topics
  • South Yorkshire Stargazers's Topics
  • Yorkshire Astronomers's Topics
  • Devon and Cornwall's Topics
  • West Midlands's Topics
  • Essex Cloud Dodgers's Topics
  • Essex Cloud Dodgers's New equipment
  • NLO and Planetarium's Topics
  • Astronomical Society of Edinburgh's Discussion
  • Dorset Stargazers's Topics
  • Hairy Stars Club (Comets)'s Tutorials and Guides
  • Hairy Stars Club (Comets)'s General Discussion
  • Hairy Stars Club (Comets)'s Observing Campaigns
  • Hairy Stars Club (Comets)'s Analysis results
  • Hairy Stars Club (Comets)'s Useful Links
  • Pixinsight Users Club's Pixinsight Discussion Forum


  • Astro TV
  • Celestial Events
  • SGL Calendar
  • Astro Society Events
  • Star Parties
  • WADAS's Events
  • Beaufort Club's Events
  • Astronomical Society of Edinburgh's Events
  • Dorset Stargazers's Events


There are no results to display.

There are no results to display.

Find results in...

Find results that contain...

Date Created

  • Start


Last Updated

  • Start


Filter by number of...


  • Start





Website URL







Found 56 results

  1. I finished observations of the Mizar A spectroscopic binary. Calibration for the Hα line made on water lines contained in the Earth's atmosphere. I used LowSpec spectrograph with 1800 grooves/mm reflective holographic grating, APM APO 107/700, QHY163M camera and HEQ5 mount with guiding. It turned out that the Earth's movement practically compensated for the radial velocity of the Mizar A system. Based on the analysis, I received the result: vr = -8.8 km/s in fact the system is approaching at a radial velocity of -6.3 km/s. I also determined the phase plot of radial velocities based on my measurements for the Na (together for both lines) and separately for Hα line: Error is based on half my spectral resolution (0.2 Å/pix corresponds to rv = 10 km/s). Each measurement corresponds to the stack a few images. The most important purpose of observing this binary system was to record the historical Ca II line (often called as CaK, 3933.66 Å). The distances in the violet part of the spectrum are almost 2x smaller than the corresponding shifts for the Hα line. This line initiated the discovery of spectroscopically binary systems, and Mizar A was the first discovered system of this type. These were the spectroscopic observations in the 19th century: Source: https://www.leosondra.cz/en/mizar/#b20 I've made several observations of this line in the last two weeks: Animation showing the changes in the CaK line based on my observations: Not only the Ca II is split, but the surrounding lines also, shown below in a wider environment: Balmer hydrogen lines are becoming more dense as Balmer's gap approaches (3646 Å). Observation result of the Hα line: And animation showing the changes in this line: The Na I doublet was much more difficult to observe, because stars with A spectral type contain very faint lines of this metal: Animation showing the changes in the sodium doublet: We received the sodium quartet
  2. Hi all, as well today the sun is shining brightly here. I set up the Lunt to have a look at it, at first just for observing. However, somehow I cannot resist and have to do a sketch This time I've chosen reddish pastels on grey paper to better catch the color of the view in the eyepiece. Telescope: Lunt LS50THaB600PT Eyepiece: Celestron X-cel 10mm Date & Time: May 15th, 2020 / 1400-1430 CEST Location: home terrace, Dusseldorf region, Germany Technique: red and orange Koh-i-Noor pastels and pastel pens on grey Canson Mi-Teintes pastel paper Size: 24 x 32 cm Clear (and sunny) skies! Achim
  3. From the album: 2015 Various

    recently found a cheap 16ic mono - a little old and kernakkered but does the job :) A stack of 7 or 8 subs of 300s 400s and 500s (kept increasing exposure length once good tracking had been established)
  4. From the album: DSO, Nebula, Galaxies, Comets etc

    The result of one of my imaging sessions from Kelling Heath Autumn Equinox star party NGC 7635 The Bubble Nebula in Cassiopeia Imaged using Atik 314L monochrome CCD camera and William Optics FLT-110 refractor on NEQ6 Pro SynScan mount 10 x 300 second subs in H-alpha

    © vicky050373

  5. I'm selling my 1.25" baader H-alpha 7nm filter. I purchased it on amazon several months ago, but have never actually used it, as my CCD didn't work. (Its just been put in a filter wheel but never used!) As such it is in perfect condition. Price £75 including delivery to a UK address. Payment via Paypal (buyer pays fees), Paypal friends, or bank transfer Any questions, please ask.
  6. Another try from the same night as M8, this time M16 Eagle Nebula in H-alpha, 7nm filter attached. It came out really nice I think.. Scope: Skywatcher EVOSTAR 80ED DS-Pro Mount: HEQ5Pro Camera: QHY168C Filter: Baader H-alpha 7nm Guiding camera: ZWO ASI120MC Guiding scope: Panagor 400mm 16x200s exposure/ 53min total at -10°C binning 1x1 Clear sky! Mariusz
  7. 2 pictures of M97 and the cyngus wall in h-alpha, 7nm, 10" scope. 8x 8 min for both. The owl was taken on 26-4-15, and the wall was taken on 12-5-15........
  8. Just had the LS35 out, and spotted a massive arc on the eastern limb. Almost touching it is a semi-detached mass of plasma on its northern side. Near the centre of the disk a large mass of bright plage is still visible. SOme smaller proms can be seen on the western limb. Not a bad start to International SUNday. I am still being bugged by some cloud drifting in from the North Sea, but hopefully I can set up the EQ mount and do some imaging, or maybe do some sidewalk astronomy in H-alpha and white light with the dual-mount bar
  9. The bright thing in the sky appeared again. So I shot it. Baader CaK + ND5 filters, DMK41, Canon 100-400L Sun 20120721 Ha by Crestie Crazy, on Flickr DMK41, Celestron X-Cel 2x barlow element, Coronado PST Trying avistack for first time today so both stacked by it. Wavelets applied in Registax 5.1, finish in PSE9. Both files were just over a minute for over 1000 frames each. I have no idea what I'm doing in avistack but have now found the full auto mode. That'll do for now! This is now my best ever detail level in H-alpha. Still got a LOT more data to go through! Will concentrate on the Ha data, due to field of view limits with the barlow, I have to do the sun in two halves. So I've got two sets for prominences and another one for surface to go, then the nightmare of blending it that I never got working well... The CaK data still isn't sharp... in part this might be reaching the limits of the 100-400L and I need to get a bigger scope on the job, once I've ordered the appropriate mounting bits.
  10. GlassWalker

    Sun 2012091 Ha

    From the album: Sun

    Another day, another sun. My 2nd attempt at a mosaic. Overcooked some parts though...
  11. I bought this filter about one year ago with the aim to protect both my Tak-100 DF and a Quark eyepiece which eventually I never bought. Therefore, I am selling it, hoping that it will go to a good home and be used as it deserves. It is a top quality Baader ERF for solar viewing with Quarks. It is in excellent condition and comes complete with housing measuring 146mm. The previous owner used to fit it on an Altair 115mm F7 refractor. With some minor modification (essentially adding some padding to the internal side of the housing) it can be fitted on many other telescopes. It cost £550 but selling for £320 including postage. I will accept PayPal (pay as a friend) or direct bank transfer. Also advertised on ABS. Thank you for looking, Piero
  12. Managed a bit of further processing on data captured on holiday - this field of view is something I would really struggle with at home (it's 9 degrees lower, and doesn't rise above my roof from my garden!) - a widefield of the Eagle (M16), Swan/Omega (M17) and M18, as well as a lot of HII in the surrounding areas. The HA filter helped a lot in cutting through the atmosphere - it's not fantastically high from the site we were at, and I still had to have a couple of nights at it dodging the trees. Details: QHY163M + Canon 200mm f2.8L (@f3.85) + Baader 7nm HA filter, mounted on a Losmandy GM8. Exposure 2h50m in 5min subs. Binned a few subs as they were of poor quality. Processing in PI. Thanks for looking At 50% resolution: Partially annotated version (lots of unmarked catalogues not shown, and not sure why Sh2-47 is marked away from the actual object! :
  13. i was wondering if anyone had any experiences with the idas uv/ir and the idas uv/ir ha enhanced. Any advice would be appreciated about which one to use with a full spectrum camera.Thanks!
  14. With old blobby back to normal last night I had a play with the Nikon D5100 Monotec + 7nm Ha filter and gathered 4x600s subs at 1600 iso with the Altair 115 EDT-APO. Processed in PI (calibrated, aligned, integrated etc) with a final tweak in PS.
  15. Heres my version of NGC 7000 and the Pelican nebula, taken back in 2015, through my William optics zenithstar 70ED with focal reducer. To fit it all in I did a 4 pane mosaic. Think the subs where 15 x 6 mins for each pane..........hope you like.
  16. Captured the data for this image on Saturday evening with an ~85% moon floating around, but pleased with the level of data I managed to get here. Taken using ST2000XM, Astrodon 5nm HA filter, through FLT110 at f5.6. This was first run after summer with a new adaptor between the drawtube of the FLT and the FLAT4 reducer - works brilliantly as it eliminates play found in the 2" nose/adaptor as before, and also reduces the vignetting as well. Exposures were 11 x 1200sec with APT; off-axis guiding with an ASI120MM and PHD2; reduction/processing in PI with final levels tweak in PS. So much background stuff here, I didn't bother with any DBE as couldn't really place the markers! Think the flats have worked nicely here though (tends to be less of an issue with backgrounds through HA anyhow). Thanks for looking!
  17. The Sun - H-Alpha light. 07-23-16 11:33am PDT Lunt 80mm Ha telescope ZWO ASI1600MM camera The light colored region around the 10 o'clock position is the sunspot active region AR2565-2567 that has created several large solar flares in the last few days. Inverted - Contrast enhanced to show prominences along the edge. Animated loop - This loop was created from 36 individual frames and loops forward and back continuously. Each frame was created from a short 250 frame AVI captured every 30 seconds. Each 250 frame AVI was stacked in AutoStakkart!2 and tweaked using Registax 6. The 36 individual frames were then colorized, layered and animation created in PhotoshopCC. 11:34:15 - 11:54:45am PDT.
  18. Hi all, Here are a couple of results from Saturday, July 20th. Amazingly complex and beautiful prominence on show...
  19. Managed to get out yesterday between showers. Was set up, imaged, packed away within 20 mins. Focus is off, I have discovered two dust bunnies, and my processing is not yet as good as others, but as it is my first, I'll love it forever PST, DMK21 600 frames @ 60fps 300 of 600 frames stacked. Colour layer in CS5. I think this is AR1515, can anyone confirm?
  20. Top pic is my original process in December. 2nd pic is a reprocess I just did a moment ago. I've been refining my technique. The 1st was rather basic - align, stack, tweak, post. On the 2nd one was done a little differently, with colour separation done earlier on (H-alpha on bayer is never fun), improved gradient removal, and more aggressive star removal and bringing out the nebulosity harder. Caution: I know Picasa which I use to host these images re-compress the red channel rather badly so try not to look too hard at the jpeg artefacts. I'm also a little cautious if the low level stuff is real or just a side effect of my processing. From my notes at the time (December): The sky was kinda annoying tonight. It seemed quite clear of orange light pollution to the naked eye, but I couldn't see "deep" myself with for example not even the whole of the W of Cassiopeia was visible. H-alpha only data. Combination of: 14x2 minutes ISO1600 7x4 minutes ISO400 5x4 minutes ISO1600 Modified Canon 450D, Astronomik H-alpha filter, Zeiss 50mm f/2 makro.
  21. From the album: DSO, Nebula, Galaxies, Comets etc

    Reprocessed image Atik 314L and Skywatcher Equinox 80 ED H-alpha 10 x 300 seconds and 15 x 600 seconds with some dark and bias frames Stacked in Deep Sky Stacker and processed in PhotoShop CS2

    © vicky050373

  22. From the album: DSO, Nebula, Galaxies, Comets etc

    The Horsehead Nebula 02.01.2017 Atik 314L and Skywatcher Equinox 80 ED H-alpha 10 x 300 seconds and 15 x 600 seconds with some dark and bias frames Stacked in Deep Sky Stacker and processed in PhotoShop CS2

    © vicky050373

  23. From the album: Sun

    Close up of prominence at around 8 o'clock of the disc.
  24. GlassWalker

    Sun 20120818 Ha

    From the album: Sun

    Sun still quite busy. First try since I shaved the eyepiece holder allowing it to be captured in one go now.
  25. Hi all. I am looking for a zoom eyepiece to 60mm lunt. My first choices are Lunt zoom and Pantax smc xf zoom. Which will work better? Can you have any other offer? You could say something more about these eyepieces while observing h-alpha?
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.