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Thread: Dissecting the Gamma Cygni Nebulae with the H-Beta Filter

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    Default Dissecting the Gamma Cygni Nebulae with the H-Beta Filter



    Hello all,

    the area around Sadr (Gamma Cygni) is rich on numerous diffuse emission nebulae.
    The core Sh2-108, including the Butterfly Nebula, is believed to be a stars births region,
    http://galaxymap.org/avedisova/html/993.html

    It is also one of the frequently photographed areas of the northern skies , like the wide field mosaic of the areas of skies around the bright Alpha and Gamma Cygni stars,
    Northern Cygnus Mosaic

    The Butterfly Nebula east of Sadr (IC 1318A/B) with the dark insert LDN 889, and the extended nebular cloud IC 1318A at NNW to NW are visible through the binoculars under the clear dark skies.

    As I have quite a number of the binocular observations of these both nebular fields, I have decided to split the IC objects,and other nebulae besides IC, into the individual DWB nebulae (Dickel, Wendker, and Bieritz Catalog of the Cygnus-X region) with the 6inch F/5 achro refractor.

    To get the small contrast differences resolved, I have mounted the narrow band Baader H-Beta CCD filter. This filter kills most of the light of the interfering stars, and it is well known for its very high contrast performance even on the fast optics and at the maximum exit pupils.
    It did not take much time to decide for the Leica L Plan 32mm eyepiece either, due to its brutal contrast performance and very high transmissivity of light. I have also believed that a larger exit pupil will be more helpful.

    As soon as aimed at Sadr, the first thing has been to get some orientation, as most of the stars have been killed. The M29 has been hardly visible, and the NGC 6910 and the Cr419 open clusters have been effectively the only ones left for the triangulated navigation.

    The first object identified has been the Butterfly Nebula, which is easy due to the dark insert LDN 889.
    Getting started at NE, the northern wing of the Butterfly has been separated into DWB 77 and 72.
    The brighter southern wing has been difficult to split into the IC 1318C (DWB76) and IC 1318B (DWB72/77/81), a bit more magnification lowering the brightness and stretching the nebulae might have been helpful.

    Moving towards NW I wanted to see the DWB 54, which is centered on Cr419. It has revealed a larger diffuse glow than what is just shown in IDSA D1. It is a DWB I can remember to have seen through the binoculars some time before, but believed it to belong to the IC 1318A.

    The very extended IC 1318A (DWB 82 and 55/59), has revealed its form, whereas through the binoculars it used to be just one diffuse glow. Both the DWB 82 and the DWB 55/59 condensations have been separated.

    South of it, the DWB 35/41 has been just diffuse, and the dark nebula B343 at north has not been identified.

    The last object seen in the extended field of the Sadr region has been the very diffuse DWB 34/39/40, SW off Sadr.

    Regarding the binocular observations over the years before:
    - the north-western IC 1318 A glow has been observed 63 times through 8x40 and larger
    - the Butterfly nebula (mostly the dark LDN889 insert) has been observed 75 times through 7x42 and larger
    - the southern glow DWB 34, 39, 40, LBN 231 has been observed 5 times through the 15x85 binoculars

    Date and time: 27th June, 2019, 23:30 – 01:00 local summer time
    Place: Backyard
    Telescope: 6inch F/5 Sky-Watcher (Synta) achromatic refractor
    Eyepiece: Leica Germany L Plan 8x/25 f=32mm #506806
    Filter: Baader H-Beta 8.5nm CCD narrow band #2458425
    Observing conditions: The Northern Coal Sack and the Aquila Rift seen with unaided eyes

    Thank you for reading,
    JG
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    Default Re: Dissecting the Gamma Cygni Nebulae with the H-Beta Filter

    An excellent report JG. It is amazing how much one can see with the binoculars as you have reported in past reports. The 6" Synta coupled with your selected optics and what must be a descent sky has served very well here. :-)I am curious what is the difference in the L And the HC plan optic. And tell me please, are you able to mount the filter on the EP or elsewhere in the optical train. Are you using the filter wheel ?
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    Default Re: Dissecting the Gamma Cygni Nebulae with the H-Beta Filter

    hallo Mark,

    and thank you for your lines!

    Quote Originally Posted by Don Quixote View Post
    ...
    I am curious what is the difference in the L And the HC plan optic. And tell me please, are you able to mount the filter on the EP or elsewhere in the optical train. Are you using the filter wheel ?
    The L and HC letters refer to the combination of the eyepieces with the Leica microscope objectives.
    L stands for the long working distance micro objectives, and HC for the short working distance - mostly APO corrected micro objectives. The letters HC are refered to as high contrast, or harmonic components, or both.

    - Leica L Plan 8x/25 #506806: 32mm focus length, lenses inside: (field stop - 2 - 1)
    - Leica HC Plan 10x/20 ##507802: 25mm focus, lenses inside: (field stop - 2 - 1),
    possibly aspheric like Zeiss E-Pl
    - Leica HC Plan S 10x/22 #507807: 25mm focus, lenses inside: (1- field stop -1-1-2)

    and the Leica HC Plan S is the highest grade corrected EP among these three. It also delivers an incredible contrast.

    I have added the Leica L Plan 8x/25 as a replacement for a 32mm Plössl (Japan). The main difference has been in the higher contrast delivered by Leica.

    As always, pay attention to the item numbers.

    The setup for the yesterday night has been:
    - 2inch Wild Heerbrugg prism in the focuser
    - reducer 2inch to 1.25inch
    - Baader helical focuser with the H-Beta filter mounted in its nose tube

    On a side line, I have also made a short H-Beta viewing of the North America and Pelican nebulae, quite promising and remarkably bright views, so the Baader H-Beta 8.5nm CCD filter might show some more details in this nebulae, as the finer details are mostly due to the ionized Hydrogen, and not so much due to the ionized Oxygen as viewed through the OIII filters.

    Best,

    JG
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    Default Re: Dissecting the Gamma Cygni Nebulae with the H-Beta Filter

    Thanks for your report!
    It is amazing how much you are able to see in that Sadr- area. I hope I'll see more of it on my darker holiday location.
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    Default Re: Dissecting the Gamma Cygni Nebulae with the H-Beta Filter

    Very nice observing, JG! Thank you for the awesome report, my friend!
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    Default Re: Dissecting the Gamma Cygni Nebulae with the H-Beta Filter

    Excellent reporting and detail JG. Always a pleasure to read of your observing results with binoculars.
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    Default Re: Dissecting the Gamma Cygni Nebulae with the H-Beta Filter

    Hello Alan,

    and thank you for your kind words!

    As I have more than 70 qualified entries on the Butterfly Nebula through the binoculars in my logbook,
    it has been upon time to make step by step a detailed dissection of the DWB nebulae in the Sadr area with a refractor.
    And the Leica L eyepiece with the Baader narrowband CCD H-beta filter, they both have made an excellent and fairly easy job.

    Clear skies,

    JG
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    Default Re: Dissecting the Gamma Cygni Nebulae with the H-Beta Filter

    Hi JG. Yet another great binoculars report from you. A great observing report from you again. I am just recently working my fifth language study, so I hope that you understand this. "Continuate la grande osservaziones." Thanks JG, and we all appreciate your great observing posts.
    Last edited by Makuser; 07-02-2019 at 09:18 PM. Reason: old aged typo
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    Default Re: Dissecting the Gamma Cygni Nebulae with the H-Beta Filter

    Oops, my mistake. You did this with your 6" refractor and the H Beta filter. I know how it is to get old and slow and not read so fast anymore. The good news is that I am going to charcoal grill some brats in the next couple of days, and although Sheri and I are not usually beer drinkers (I am German and she is Swedish ), we are going to enjoy some brew for our 4th July cookout.
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    Default Re: Dissecting the Gamma Cygni Nebulae with the H-Beta Filter

    No problem Marshall,

    I understand you, and you are most heartily welcome!

    Well, both the Swedish and Germans are pretty fit in beer drinking, so it should not be a problem.
    Now, I am drinking Jever a very bitter beer from north Germany, but excellent stuff.

    Prosit,

    JG
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