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Thread: Sh2-71 PN and Sh2-72 EN in Aquila, visually on the 22nd and 23rd August

  1. #1
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    Default Sh2-71 PN and Sh2-72 EN in Aquila, visually on the 22nd and 23rd August



    Hello all,

    finally, we have got reasonably clear night skies to work on the residuals in my observing lists.
    And moreover, the big 12.3mag bipolar planetary nebula Sh2-71 has been declared by Rene in Germany as the object of the month for July. So, at least in August it has been due.

    The wide field capture of this area of skies is shown in https://britastro.org/node/8428

    The Sh2-72 is the extended glow in the middle, the Sh2-71 is the small planetary to the west, and the globular cluster NGC6749 is to the south-east.

    I have decided to take as the starter the Sharpless diffuse emission nebula Sh2-72,
    http://galaxymap.org/cat/view/sharpless/72 ,
    which is the brightest diffuse emission nebula in this area of skies.
    Its coordinates are 19h03m50.2s +0218‘50“, the diameter is 25 arcmin.

    It has required some more dark adaptation to see a very faint glow at the magnification of 30x through the UHC filter.
    The glow became better defined through the H-Beta filter, and also seen at the higher magnification of 41.7x

    This nebula is as easy and as difficult to observe as most of the other Sharpless nebulae of similar size, and with the brightness of 2 on the Sharpless scale 1-2-3.
    It is another nebula missing in the IDSA, even if observable through the small aperture telescopes.

    The planetary nebula Sh2-71 (Minkowski 1-90) turned out to be more tough at the very beginning on the 22nd August,
    even if its position 19h02m02.3s +0209’35” has been easily found due to the surrounding stars pattern.
    And finally on the 23rd August, the UHC filter has revealed a very faint diffuse glow with some structures difficult to keep throughout a series of increasing magnifications of 83.3x, 107x, 125x. The maximum photographic extension of this nebula is 2.6 arcminutes.
    The OIII filter has finally revealed a concentrated smaller oval glow at the magnification of 83.3x, but even then, the bipolarity of this planetary nebula has not been visible.

    Anyway, this planetary nebula is worth of looking at, and even through the small aperture telescopes.

    The NGC6749 globular cluster has shown just a condensation in the stars field, something I would have overseen not knowing that there is a globular cluster on the way. So, I don’t count this globular as observed.

    Date and time: 22nd and 23rd August 2019, 22:15 – 23:30
    Place: Backyard
    Telescope: 6inch F/5 Sky-Watcher (Synta) achromatic refractor
    Eyepieces: Leica HC Plan S 10x/22 (f=25mm), Pentax SMC O-18, O-9, O-7, O-6 Abbe orthos
    Filters: Astronomik UHC and H-Beta, Baader visual OIII (10nm passband)
    Observing conditions: Milky Way faintly shining from Cepheus down to the Scutum Cloud,
    Andromeda Galaxy averted with unaided eyes

    Thank you for reading,

    JG
    Last edited by j.gardavsky; 08-24-2019 at 02:47 PM.
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    Default Re: Sh2-71 PN and Sh2-72 EN in Aquila, visually on the 22nd and 23rd August

    Hi JG!

    Nice observing! I have not tried Sh2-72.

    I was able to score the planetary and glob back on 15 October 2017:

    7. Sharpless 2-71 - NEW - ALPN
    (Planetary Nebula in Aquila, mag 12.3, size 2.1’ x 1.2’)
    Observed: Oct 15, 2017 at 20:59:25
    Comment: Sheesh. Everything is fighting me tooth and nail tonight. 84, OIII filter installed. I can just barely pick out a roundish whiff of a glow, and only with averted vision.
    Equipment: AD12, ES 82 18mm

    That hurt me.

    Just for grins, I moved north via eyepiece and honed in on a globular cluster.

    8. NGC 6749
    (Globular Cluster in Aquila, mag 12.4, size 6.3’)
    Observed: Oct 15, 2017 at 21:05:06
    Comment: 2nd visit to this glob. Since I was right there beside it. Man, this is one tough globular cluster to pick out. Even at 138, it is merely a subtle averted vision round softness.
    Equipment: AD12, ES 82 18mm, 11mm
    And further northwest a bit…

    9. NGC 6760
    (Globular Cluster in Aquila, mag 9.0, size 6.6’)
    Observed: Oct 15, 2017 at 21:08:58
    Comment: 2nd visit. And again, since I was right there. At 138, a seemingly much larger affair (more visible in other words), though still rather faint and diffuse, a larger round anti-shadow and not terribly concentrated.
    Equipment: AD12, ES 82 18mm, 11mm
    Bryan

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    Default Re: Sh2-71 PN and Sh2-72 EN in Aquila, visually on the 22nd and 23rd August

    Hello Bryan,

    and thank you very much for your observing reports - a very helpful comparison!

    I knew that the both Sharpless will be very tough, and hence they have slipped at the bottom of the observing list.
    Another problem might have been, that they are located in a still fairly bright section of the Milky Way, and this applies also to the nearby globular.

    Technically it looks like, the orthos and the Leica have been the only EPs to show these Sharpless.

    Now, my observing program for the summer season is over, and the scope is back in the golf bag.

    Best,

    JG
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    Default Re: Sh2-71 PN and Sh2-72 EN in Aquila, visually on the 22nd and 23rd August

    What a nice and high quality observations!
    JG, thanks for this excellent report of these difficult objects!
    And Bryan for your superb comment on it!
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    Default Re: Sh2-71 PN and Sh2-72 EN in Aquila, visually on the 22nd and 23rd August

    Thank you John!

    On the web, there are some sketches of the Sh2-71 planetary nebula showing its inner donut form,
    but they have been made on the 16inch and 18inch Dobs.

    Best,

    JG
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    Default Re: Sh2-71 PN and Sh2-72 EN in Aquila, visually on the 22nd and 23rd August

    Hello JG and Bryan. A very nice pair of reports on these Sharpless targets. With these extended objects, the low surface brightness, or magnitude, can be quite tricky to make an observation. Thanks for your reports, and have a great weekend.
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