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Thread: NGC 6888 Crescent

  1. #1
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    Default NGC 6888 Crescent



    In August I was on holiday under Bortle 4 skies , a threat for an urban observer. I had taken along my 140mm Maksutov OMC140 on GPDX. The OMC140 is a nice compact telescope, weighs 8 pounds and has Strehl 0.97, when properly collimated and cooled down. As NGC6888 was the object of the month of the Dutch astroforum where I am member too, I observed and sketched it.

    At home, NGC6888 is invisible. Even the 14 inch Celestron of my local public observatory doesn't show it conclusively. ( it is one of the worst places in the Netherlands.............not so 40 years ago though........)

    Anyway, in the much darker place I was, a faint glow of the two northern bows was visible. I magnified 64 times, which I thought was still a bit too much. I wished I had brought along the lowest 44X, the dark background could handle that wider exitpupil by all means. At 125X the bows dissapeared. Luckily my finder did show "something, somewhat brighter" over there, although observers here pointed me out that the dizzying number of stars over there can easily mislead you. I am afraid they are right.

    The sketch appeared earlier over here,
    but not exclusively in the sketch forum. Because of which I add the raw sketch too. In the raw sketch one sees more stars....they are but irregularities in the simple paper I used. (could not find my sketch book while packing..)

    The raw sketch was photographed, discolored en made negative. Some pulling on the contrast knobs and making the stars a bit rounder finished the job.



    And the raw one:

    Attached Images Attached Images
    Telescopes in Schiedam : SW 150 F/5 Achromat, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 maksutov F/14.3, SW 102MAK F/13 on Vixen GPDX.
    Binoculars: AusJena 10X50 Jenoptem, Swarovski Habicht 7X42, Celestron Skymaster 15X70, Swift Observation 20X80.
    Astronomical Rijswijk observatory telescopes: Astro-Physics Starfire 130 f/8 on NEQ6, 6 inch Newton on GP, C8 on NEQ6, Meade 14 inch SCT on EQ8, Lunt.
    Amateur since 1970.

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    Default Re: NGC 6888 Crescent

    I like your sketch very much, John!

    I have been considering engaging in this activity too. I just need to begin.
    Bryan

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    Default Re: NGC 6888 Crescent

    This evening I revisited NGC6888 with a 120mm refractor from my Bortle 7-8 backyard. Without a filter no nebulosity. I tried two filters this time: a simple broadband CLS ( known here as Clear Sky) filter and my new Neodymium.

    I saw no northeastern or northwestern bows with either of them. Strangely enough I saw some hints of nebulosity in the southern region, not the southern bow though. I suppose it is light from some invisible background stars, there are a lot of them over there. Turned the eyepiece and the filter. Still there. Don't know why I didn't see it before, I suppose I was quite distracted by the two bows on my holiday-site.

    Anyway, a pleasant observation.
    Last edited by j.gardavsky; 09-02-2018 at 03:04 PM. Reason: Neodymium
    Telescopes in Schiedam : SW 150 F/5 Achromat, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 maksutov F/14.3, SW 102MAK F/13 on Vixen GPDX.
    Binoculars: AusJena 10X50 Jenoptem, Swarovski Habicht 7X42, Celestron Skymaster 15X70, Swift Observation 20X80.
    Astronomical Rijswijk observatory telescopes: Astro-Physics Starfire 130 f/8 on NEQ6, 6 inch Newton on GP, C8 on NEQ6, Meade 14 inch SCT on EQ8, Lunt.
    Amateur since 1970.

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    Default Re: NGC 6888 Crescent

    Oops......Neomydium must be : Neodymium. Sorry, it is quite neo...
    Telescopes in Schiedam : SW 150 F/5 Achromat, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 maksutov F/14.3, SW 102MAK F/13 on Vixen GPDX.
    Binoculars: AusJena 10X50 Jenoptem, Swarovski Habicht 7X42, Celestron Skymaster 15X70, Swift Observation 20X80.
    Astronomical Rijswijk observatory telescopes: Astro-Physics Starfire 130 f/8 on NEQ6, 6 inch Newton on GP, C8 on NEQ6, Meade 14 inch SCT on EQ8, Lunt.
    Amateur since 1970.

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    Default Re: NGC 6888 Crescent

    Hello John,

    a very nice second sketch of Crescent from you!

    For whatever reason ever, I have not been very successful with the Neodymium filters on the nebulae.

    Best,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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    Default Re: NGC 6888 Crescent

    Quote Originally Posted by j.gardavsky View Post
    Hello John,

    (...)

    For whatever reason ever, I have not been very successful with the Neodymium filters on the nebulae.

    Best,

    JG
    I am glad you mentioned it. It is starting to puzzle me. The vague nebulosity I saw in the southern part was seen with a CLS broadband filter. Although very very vaque, it was there all right. As mentioned: rotating the filter and eyepiece; and even slewing did not make it disappear. Filter was clean. Even broadband filters do not have the habit of showing weak starlight as I come to think of it. So it must have been a part of the nebula after all. I suppose the neodymium was a bit to narrowbanded for this one. I'll do another observation; on M27 as well, since its respons to deepsky filters is obvious.

    I have read about excellent results of the neodymium on planets.
    j.gardavsky and Gabby76 like this.
    Telescopes in Schiedam : SW 150 F/5 Achromat, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 maksutov F/14.3, SW 102MAK F/13 on Vixen GPDX.
    Binoculars: AusJena 10X50 Jenoptem, Swarovski Habicht 7X42, Celestron Skymaster 15X70, Swift Observation 20X80.
    Astronomical Rijswijk observatory telescopes: Astro-Physics Starfire 130 f/8 on NEQ6, 6 inch Newton on GP, C8 on NEQ6, Meade 14 inch SCT on EQ8, Lunt.
    Amateur since 1970.

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    Default Re: NGC 6888 Crescent

    Hi John. A superior sketch of NGC 6888, the Crescent Nebula. I wish that I had your talents. Thanks for sharing this fine sketch with us on here John, and keep up the great work.
    - Marshall

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    Default Re: NGC 6888 Crescent

    I promised to do another observation. Bortle 7-8. Unfortunately it was not very clear. So, no nebulosity on NGC6888 without filters, Neodymium or CLS. Not even the northern bows.

    M27 could easely be seen without a filter. The CLS did a good job on M27; remarkable darker sky and as a result more contrast on M27. The difference between Neodymium and no filter was negligible.

    So I turned to some other highlights.

    All observations were done with 120mm Evostar, 19mm Pan, 7mm Nagler and 5mm Pentax XW.
    Telescopes in Schiedam : SW 150 F/5 Achromat, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 maksutov F/14.3, SW 102MAK F/13 on Vixen GPDX.
    Binoculars: AusJena 10X50 Jenoptem, Swarovski Habicht 7X42, Celestron Skymaster 15X70, Swift Observation 20X80.
    Astronomical Rijswijk observatory telescopes: Astro-Physics Starfire 130 f/8 on NEQ6, 6 inch Newton on GP, C8 on NEQ6, Meade 14 inch SCT on EQ8, Lunt.
    Amateur since 1970.

 

 

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