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Thread: Sh2-134 and Sh2-135 in Cepheus, and a Zeiss E-Pl / Leica HC PLAN S shootout

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    Default Sh2-134 and Sh2-135 in Cepheus, and a Zeiss E-Pl / Leica HC PLAN S shootout



    Hello all,

    the first clear dark skies since the Soltice are often the best time for a great observing session of the season.
    And this has happened on this Saturday/Sunday night, revealing the Milky Way well structured from Cepheus through Cygnus down to Aquila.
    The Cepheus OB2 stars association (Harrington 11), the le Gentil 3 “Northern Dark Ink Spot”, and the Milky Way cloud surrounding the not detached North America Nebula, the Fish On The Platter in Cygnus, and other features in the summer Milky Way, stood nicely out with an amazing contrast to my unaided eye.

    The final choice has been the southern area in Cepheus:

    Sh2-134: 22h11m59.8s +59°24’37”, diameter 160 arcmin, medium bright (2 of 3 as rated by Sharpless)

    Sh2-135: 22h22m11.0s +58°44’18”, diameter 15 arcmin, medium bright (2 of 3 as rated by Sharpless)

    see http://galaxymap.org/cat/list/sharpless/131

    These Sharpless nebulae have been hardly reported visually, even if they are nice targets for the richiest field telescopes at the lowest magnifications.
    They respond to some extent to the UHC filter, but much better to the H-Beta filter.
    The first light has been always through the Leica B 32x WW.
    Through the H-Beta filter, they became well detached from the surrounding stars field.

    Sh2-135:
    The nebula is easily found nearly 1° NWW off the bright Delta Cephei double, its position is shown in IDSA, page 8.
    Its visual appearance is that of a faint oval, no ‘blister’ form resolved. Best seen at the middle magnification of 53.6x, exit pupil 2.8mm through the Leica B 32x WW spotting eyepiece.

    Sh2-134:
    The nebula is ‘hanging’ on Lambda Cephei, and it reveals two concentrated emission areas: SW, and SE off Lambda Cephei.
    I have seen this nebula at best at the low magnification of 30x, exit pupil 5mm.
    I would rate it as the best Sharpless emission nebula for the small richiest scopes in this area of skies. Even if not difficult to observe, its position is not shown in IDSA.

    Other objects seen will be eventually reported in another thread.

    Shootout of the Carl Zeiss E-Pl 10x/20 #44 42 31 (01) against Leica HC PLAN S 10x/22 #507807 on the Sh2-134 nebula

    These both eyepieces, which are regarded as unsurpassed top notch for hunting the faint low surface brightness deep sky objects, have shown equally bright the both glows of this nebula through the H-Beta filter at the magnification of 30x (exit pupil 5mm).
    (The Zeiss has been reported to have the peak transmissivity of 98%.)

    The main difference is the ‘milky’ appearance of the both glows through the Zeiss against a higher contrast and some structures in the both glows through the Leica.
    In the glow SW off Lambda Cephei, the perceived irregularity in contrast may be due to the dark insert, as seen on the astro photos.
    In the glow SE off Lambda Cephei, there have been visible some lowest contrast level variations in the glow.

    The both eyepieces have been repeatedly swapped.

    Date and time: 18th July, 2018, 23:00 – 01:20 local summer time
    Observing conditions: Well structured Milky Way across Cepheus – Cygnus – Aquila
    Place: Backyard
    Telescope: 6” Synta (Sky-Watcher) F/5 achromatic refractor
    Eyepieces: Pentax XW 3.5mm and 10mm (magnifications 214x and 75x),
    Leica B 32x WW 14mm 73° AFOV (magnification 53.6x, exit pupil 2.8mm),
    Carl Zeiss E-Pl 10x/20 (magnification 30x, exit pupil 5mm),
    Leica HC PLAN S (magnification 30x, exit pupil 5mm),
    Filters: Astronomik UHC, and H-Beta
    Side-by binoculars: 10.5x70 BA8, 25x100 FB

    Thanks for reading,

    JG
    Last edited by j.gardavsky; 07-19-2018 at 04:29 PM. Reason: typo in title
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    Default Re: Sh2-134 and Sh2-135 in Cepheus, and a Zeiss E-Pl / Leica HS PLAN S shootout

    Thanks JG, for this nice shootout on two rather (at least to me) unknown nebulae. Even Sky Safari doesn't show it in the map. (only as DSS image) I never knew they were detectable visually. So in my humble opinion you did a great job. So the Leica has won with a nose-length? I wonder if those beauties should be visible with binoculars ( 50, 70, 80mm class) ?
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    Default Re: Sh2-134 and Sh2-135 in Cepheus, and a Zeiss E-Pl / Leica HC PLAN S shootout

    Hello John,

    these both are the first time nebulae observed, as I am working down the nebulae in the Sharpless list, which are not included in the NGC/IC catalogues. So, my count of tonight reads: 29 seen before, 2 more seen yesterday.

    I am not so much surprized to see the Leica HC PLAN S as a winner in the contrast performance,
    been just curious how it compares with the Carl Zeiss E-Pl in transmissivity on the H-Beta wavelength.

    Regarding the binoculars, I don't think that even the 25x100 from China will reveal these both nebulae.

    Most of the Sharpless nebulae in Cepheus belong to the markers of the Cepheus Bubble, which is a hugh area of skies glowing on nearly all wavelengths, up from the microwaves.

    Best,

    JG
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    Default Re: Sh2-134 and Sh2-135 in Cepheus, and a Zeiss E-Pl / Leica HC PLAN S shootout

    Thanks much for the useful information!
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    Default Re: Sh2-134 and Sh2-135 in Cepheus, and a Zeiss E-Pl / Leica HC PLAN S shootout

    A nice report JG, I am going to have to start looking more at these Leica eyepieces in the future.
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    Default Re: Sh2-134 and Sh2-135 in Cepheus, and a Zeiss E-Pl / Leica HC PLAN S shootout

    Thanks for the great report and shootout, JG!
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    Default Re: Sh2-134 and Sh2-135 in Cepheus, and a Zeiss E-Pl / Leica HC PLAN S shootout

    Great report JG! Added to my nebulae list. Glad that you managed some good quality skies. thanks
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    Default Re: Sh2-134 and Sh2-135 in Cepheus, and a Zeiss E-Pl / Leica HC PLAN S shootout

    Many thanks, JG, both for the nice write-up and for some suggestions of off-the-beaten-path objects!

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    Default Re: Sh2-134 and Sh2-135 in Cepheus, and a Zeiss E-Pl / Leica HC PLAN S shootout

    Niceones, JG! You're the expert, is an H beta filter good to have? I mean comparable to the usefulness of a uhc or oiii? Cuz if I don't buy a new scope I would at least wanna get the max out of the old one...
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    Default Re: Sh2-134 and Sh2-135 in Cepheus, and a Zeiss E-Pl / Leica HC PLAN S shootout

    Great night JG and nice report. I need to track down some of those nebulae. While iffy if it can be done from home, I plan on doing so during next month's dark sky trip. In fact, my observing list for those few days is getting bigger and bigger.
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