The Baby Dumbbell Nebula HU 1-2 / First light LX200 8" ACF

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Menno555
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The Baby Dumbbell Nebula HU 1-2 / First light LX200 8" ACF

Post by Menno555 » Sat Oct 24, 2020 11:05 am

The Baby Dumbbell Nebula HU 1-2

A few weeks ago I discovered ... well okay, I did read about the Dumbbell Nebula and that there are 2 other "Dumbbells": the Little Dumbbell (M76) .... and the Baby Dumbbell (Hu 1-2 , PN G086.5-08.8, PK 086-08.1, ARO 89).
This one is almost never captured, it has no NGC or IC number so it's not on the listings that a lot of people check. So of course had to try it (I am a sucker for underdogs) with first light of my Meade LX200 8" f/10 ACF OTA.
Also a challenge because my Zwo ASI294MC Pro is send to Zwo to check, so I did this with the ASI385MC which has no cooling and a way smaller FOV. This capture is uncropped 13.7 x 7.76 arcmin and has 0.425 arcsec/pixel.
Collimation of the LX200 was just great: only had to do 2 tiny adjustments. Still obvious room for improvement but I just had to do this first light because: clear skies :) Because of that, the stars are in focus but big.
And the scope really is an improvement over the LX65 8" ACF: focussing is better, of course the mirror lock is cool and the optics are even better from what I can see now with the ASI385MC.

The Baby Dumbbell Nebula is a planetary nebula, it is fairly bright (mag 7 core and mag 12 arms) and rather easy to find as a small blob with a 6" scope or bigger in Cygnus. The sort of X-shape is clear to be seen but it has almost no color.
The inner part is 15 arcsec and with the arms it's around 25 arcsecs. The structure itself has a kind of fuzzy cloud-like appearance, but this is only visible with a > 20" scope or the HST. It is at 9900 light years and was discovered in 1920.

The Netherlands, Bortle 7/8
Meade LX200 8" f/10 ACF OTA
Ioptron CEM25EC mount (no guiding)
Baader Neodymium SkyGlow filter
Zwo ASI385MC camera

Captured with SharpCap Pro
100 x 60 sec / Gain 90 / Offset 15 / White balance R50/B50
Manual dithering

Stacked in DeepSkyStacker 100 lights + 28 darks + 100 flats + 100 dark flats

Processed in Photoshop
Levels, curves, color saturation, reduce noise.

Image

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Re: The Baby Dumbbell Nebula HU 1-2 / First light LX200 8" ACF

Post by admin » Sun Oct 25, 2020 8:59 am

Hi Menno,

a great image for first light from a new telescope. I'm intrigued by the very slight hexagonal spikes on the stars – I wouldn't have expected that from an SCT. I wonder where that's coming from?

Cheers, Robin

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Menno555
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Re: The Baby Dumbbell Nebula HU 1-2 / First light LX200 8" ACF

Post by Menno555 » Sun Oct 25, 2020 1:57 pm

Thanks Robin!
And the spikes really are there because of the processing I think. The LX65 had the same. Visually there are no spikes what so ever.
Also, the combination scope / camera is rather high in the oversampling scale: with OK seeing the ideal would be between 0.67 - 2 "/pixel but this combo gives 0.38 "/pixel.

Menno

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Re: The Baby Dumbbell Nebula HU 1-2 / First light LX200 8" ACF

Post by admin » Mon Oct 26, 2020 7:03 pm

Ah, gotcha - I have seen similar mini spikes on a refractor where the (stupid) design of the lens mount sticks out by just 1mm or so into the active area of the objective at 3 points. Whoever spoilt a perfectly good scope with that design blunder is a true Homer Simpson amongs Vixen employees...

cheers,

Robin

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