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EAA Monthly Observing Challenge - July 2021

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#26 donstim

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Posted 07 July 2021 - 08:47 PM

This was captured on July, 1 just after 12am, so definitely in time for this month's challenge! While one instance of Sharpcap was shooting darks and bias frames for the sake of science (see the flat research thread), another was pointed at M8.

 

Here it is after 10x60s as seen from my Bortle 8-9 balcony, L-Enhance filter, Altair 294c... and no flats as can be seen. It's still a beautiful nebula, even with no flats

 

attachicon.gifM8-10x60s-LEnhance.jpg

Interesting coincidence -- I have been doing EAA with some dim nebulas with an L-eXtreme filter on my ASI 294MC Pro camera on an 8-inch SCT with 0.63x focal reducer and have experienced the same stacking histogram that you have pictured here. The histogram starts at the right side of the peak, so there is really no black level adjustment available. Yet the display histogram looks normal.

 

I have found that in most cases, if I move the color sliders (mainly red and blue) upwards, I can get to the left of the histogram peak and can adjust the black level. I also found that if darks are not applied, the entire histogram is shown in the stacking histogram. It is only when darks are applied that it looks like that. 

 

Is there a reason why you did not apply flats? I found that applying flats only would over-compensate -- the image would have bad inverse vignetting. But if darks were also applied, the flats appear to work fine. Just the weird histogram issue. Another solution to the strange histogram that I tried was to increase the offset/brightness. That worked for the histogram shape, but then vignetting (or reverse vignetting, I can't remember which) would appear because the brightness level was then different from that used to create the dark frame.

 

It may be possible that longer exposures are necessary (I was using 20-30 seconds at gain 350 in my case), but I didn't have darks at longer exposures in order to try that.

 

Maybe you know what's going on with the stacking histogram here and can explain?

 

By the way, the image looks fine without further adjustment of the black level.

 

Edit: Never mind, I found the answer! (See https://forums.sharp...php?f=5&t=4226)


Edited by donstim, 08 July 2021 - 01:58 PM.


#27 YossiZ

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Posted 07 July 2021 - 11:27 PM

Some objects are quite low, some transit really late. I guess this way everybody gets something 😀

 

This is what I have so far. Some were a great challenge. I will try to add M8 later on as well.

 

NGC 4567/8, low at 30° altitude, 20x45s:

Light_Stack_20frames_ASILive_45sec_Bin2_29.7C_gain270_2021-07-07_222650.jpg

 

NGC 5394/5, 21x45s:

Light_Stack_21frames_ASILive_45sec_Bin2_29.6C_gain270_2021-07-07_230231.jpg

 

NGC 4631, from 9.5, 8x45s:

Light_Stack_8frames_ASILive_45sec_Bin2_30.0C_gain270_2021-05-09_012933.jpg

 

 


Edited by YossiZ, 07 July 2021 - 11:41 PM.

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#28 YossiZ

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Posted 07 July 2021 - 11:29 PM

M20, 36x20s:

Light_Stack_36frames_ASILive_20sec_Bin1_30.5C_gain270_2021-07-03_012358.jpg


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#29 dave85374

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Posted 08 July 2021 - 02:04 PM

Here is my first contribution of any photo's on this site.  All shots were 30  & 8 sec with gain 120. gain 120.  Almost 3 months experience now.

 

Evolution 8

HyperStar8

ASAIR Pro

ASI294mc Pro

Optolong L Pro

Attached Thumbnails

  • M20 IPAD 2a.jpg
  • M27.jpg
  • M17 IPAD.JPG

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#30 dave85374

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Posted 08 July 2021 - 02:08 PM

More:


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#31 dave85374

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Posted 08 July 2021 - 02:10 PM

More:

Attached Thumbnails

  • NGC4631_Stack24_Light_NGC4631_8.0s_Bin1 (2e).jpg
  • M29_Stack6_Light_M29_10.0s_Bin1(1a).jpg
  • M16 IPAD.JPG

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#32 drprs8181

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Posted 09 July 2021 - 08:42 AM

Managed two more last night.  These southern targets only get about 15deg above the horizon here and are over the neighbor's house and streetlights down the road.  Even the filter couldn't cut out the glare, but they're there.

 

 

NGC 6357 - 7/8/21 @ 2245 - 17x40s | Gain 350 - Transparency: Good - AT80ED w/DGM NPB

Slightly cropped

NGC 6357 Lobster Nebula AT80ED w/DGM NPB

 

NGC 6334 - 7/8/21 @ 2230 - 17x40s | Gain 300 - Transparency: Good - AT80ED w/DGM NPB

Stack 17frames 640s WithDisplayStretch

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#33 donstim

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Posted 10 July 2021 - 03:53 AM

NGC 6888 Crescent Nebula. L'eXtreme filter. 30 minutes with 60 sec sub-exposures (30 frames). SharpCap 4.0. Very happy I could get 60 sec sub-frames with my alt-azimuth mount.

Resized, but not cropped.

Crescent Nebula resized.jpg


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#34 donstim

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Posted 10 July 2021 - 04:10 AM

Wizard Nebula, same exposures, etc. as above.

Wizard Nebula resized.jpg


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#35 donstim

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Posted 10 July 2021 - 04:38 AM

And the Bat Nebula. This time shorter exposures (45 sec) and shorter total integration time (10 frames - 7.5 minutes)

Bat Nebula resized.jpg


Edited by donstim, 10 July 2021 - 04:38 AM.

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#36 Tiago Ferreira

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Posted 10 July 2021 - 06:18 PM

2 nights ago

M20 Trifid

12" f5 dob

eq platform

zwo asi 294

outside 30ºC

sensor 27ºC

Gain=350
Exposure=8,000s

54 frames

 

cc2_edited.jpg


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#37 Tiago Ferreira

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Posted 10 July 2021 - 06:36 PM

Yesterday

Bat nebula

12" f5 dob

eq platform

zwo asi 294

outside 29ºC

sensor 23,9ºC

Gain=350
Exposure=5s

149 frames

 

cc.jpg


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#38 PeterAB

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Posted 10 July 2021 - 10:57 PM

Got some time on the crescent nebula (ngc 6888) last night.   There was a nice and unexpected break in cloud cover and wildfire smoke.   This object is not eyepiece visible from my city backyard.    Easy to find with a non-goto mount do to it being located near a unique pattern of rather bright stars.  

 

Taken with my Meade 2080 8" SCT on the original tracking fork mount.    0.63 reducer working at f5.8.   Zwo ASI294MC 2x2 binning. 

 

This was my first night out with my new 294mc (non-cooled version).    It worked well.    I have few small adjustments to make.

 

68x8 seconds.  Gain 322.    Saved as displayed in SharpCap.

 

Crescent nebula (ncg 6888) and carbon star RS Cyg.  Stack 68frames 544s
 
Peter

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#39 GaryShaw

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Posted 11 July 2021 - 12:42 PM

Finally, after 1:00 we got a decent night for observing. I tested a few things on the new CEM70g mount, first EQ mount I've had, and by then, the Crescent and East Veil had rolled into my limit sky so I had a go at them with a 8" TS F4 Newtonian. I had the Optolong LeNhance filter in place for both images and both images were cropped and reduced in size. 

 

Crescent Nebula:  78frames/ 8 sec/ 400 gain/ darks only

 

Crescent_Stack_78frames_624s_WithDisplayStretch.jpg

 

 

Here's a mono screenshot of the Crescent. I actually was able to zoom in/out on this and found it seemed to hold more detail than the color image above although its the same exposure, etc. I'll use this image for doing my sketch(s) of this object.

 

Crescent_Mono_SC Screen copy.jpg


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#40 GaryShaw

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Posted 11 July 2021 - 12:44 PM

 East Veil Nebula: 92 frames/ 8 sec/ 400 gain / Darks and Flats

 

EVeil_Stack_92frames_736s_WithDisplayStretch.jpg

 

 

The Bat Nebula, IC 1340 appears faintly on the right end of the image above. Guess I needed more integration time to bring that out more prominently...


Edited by GaryShaw, 11 July 2021 - 01:15 PM.

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#41 Cey42

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Posted 11 July 2021 - 12:57 PM

Equipment

  • Celestron 8” SCT on Celestron Advanced VX mount
  • Celestron F6.3 focal reducer
  • Darks/Flats applied
  • Offset 10, binning of 1 for all images
  • Bortle 7 (red zone). Seeing OK.
  • Live Stacked.  Screen Saved (Cropped and Resized)

 

 

Using ZWO ASI294MM. No filter.

 

NGC4631/NGC4627
43x6s. 300 gain.
Just able to make out 4627. I like the mottled dust lanes of 4631.

C32-7_2_2021-43x6s.jpg

 

 

M100
50x6. 300 gain
Nice spiral arms. Also caught faint glimpses of NGC4322 at 1’oclock and NGC4328 at 3’oclock

M100-7_2_2021-50x6s.jpg

 

 

NGC5394/5395
60x6s. Gain 300

NGC5394-7_5_2021-60x6s.jpg

 

 

Using ZWO ASI294MC. Optolong LPro filter

 

M29
9x12s. 300 gain

M29-7_9_2021-9x12s.jpg

 

M20
26x12s. 300 gain
At 18 degrees altitude, I was not sure how this would come out but I really wanted to give it a try. I was able to see a lot more than expected. I even caught some of the reflection nebula above.

M20-7_2_2021-26x12s.jpg

 

 

M8
25x12s. 300 gain
Another beautiful nebula

M8-7_2_2021-25x12s.jpg

 

 

NGC6888
46x12s. 300 gain
I was disappointed that this did not come out better. I was getting lots of noise. Probably did not help that it was just above my extremely hot roof. I will have try again later in the month when it is higher up and with much longer total exposure.

C27-7_2_2021-46x12s.jpg


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#42 GazingOli

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Posted 11 July 2021 - 07:14 PM

long time that I had the chance to contribute to this part of the forum. due to weather and occupation my last session was a while ago. last night I had the chance for a short session with fair conditions. I tried out my new used ASI294 with the CPC800 on wedge. Flats and darks applied, however I had some trouble with the flats. But still quite good results. I used a TS broadband UHC filter. Gain 300 - 400 as far as I remember.

 

M8 with CPC800 on wedge @f6.3 camera ASI294 MC non cooled UHC filter 54frames x 8s = 432s resized

C8f6.3ASI294UH M8_54frames_432s_resized.jpg

 

M20 with CPC800 on wedge @f6.3 camera ASI294 MC non cooled UHC filter 50frames x 8 = 400s cropped & resized

C8f6.3ASI294UH M20_50frames_400s_cropresized.jpg

 

NGC6888 with CPC800 on wedge @f6.3 camera ASI294 MC non cooled UHC filter 11frames x 64s = 704s resized

C8f6.3ASI294UH NGC6888_11frames_704s_resized.jpg

 

more to come...

 

 

 


Edited by GazingOli, 11 July 2021 - 07:34 PM.

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#43 GazingOli

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Posted 11 July 2021 - 07:19 PM

I hope this is the correct one:

NGC6960 with CPC800 on wedge @f6.3 camera ASI294 MC non cooled UHC filter 12frames x 64s = 768s resized
C8f6.3ASI294UH NGC6960_12frames_768s_resized.jpg

first time ever I got some decent results on this nebula - now that I am using the wedge and longer exposures

NGC7380 with CPC800 on wedge @f6.3 camera ASI294 MC non cooled UHC filter 9frames x 64s = 576s resized
C8f6.3ASI294UH NGC7380_9frames_576s_resized.jpg

that was it for now - hope to get back to the rest of the list some time later

Have fun!

CS.Oli

Edited by GazingOli, 12 July 2021 - 01:02 AM.

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#44 alphatripleplus

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Posted 12 July 2021 - 06:33 AM

I hope this is the correct one:

NGC6960 with CPC800 on wedge @f6.3 camera ASI294 MC non cooled UHC filter 12frames x 64s = 768s resized
attachicon.gifC8f6.3ASI294UH NGC6960_12frames_768s_resized.jpg

 

Nice, Oli. However, IC1340 (also known as the Bat Nebula) is  part of the Eastern Veil rather than the Western Veil that you captured smile.gif .


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#45 GazingOli

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Posted 12 July 2021 - 11:17 AM

it was my mount's fault! ;) went to the wrong object...

 

CS.Oli


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#46 alphatripleplus

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Posted 12 July 2021 - 07:39 PM

Yes, just like some people confuse right with left, some mounts confuse east with west.lol.gif


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#47 Tiago Ferreira

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Posted 13 July 2021 - 01:54 PM

Why is the Lobster Nebula forming some of the most massive stars known? No one is yet sure. Cataloged as NGC 6357, the Lobster Nebula houses the open star cluster Pismis 24 near its center -- a home to unusually bright and massive stars. The overall blue glow near the inner star forming region results from the emission of ionized hydrogen gas. The surrounding nebula, featured here, holds a complex tapestry of gas, dark dust, stars still forming, and newly born stars. The intricate patterns are caused by complex interactions between interstellar winds, radiation pressures, magnetic fields, and gravity. NGC 6357 spans about 400 light years and lies about 8,000 light years away toward the constellation of the Scorpion.  - in Nasa
Last night. EAA (Image not edited) - as seen on monitor
12" f/5 dobsonian in Eq platform
ZWO ASI294MC
290x4s

 

cc.jpg

 

 


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#48 bmcclana

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Posted 15 July 2021 - 11:43 AM

I have spent the last 3 weeks of clouds and rain improving my setup. 

 

  • disassembled, cleaned, lubed and adjusted both axes on my AZ-GTi
  • built an arduino nano based autofocus controller based on the ardufocus setup. 
  • designed a bracket to mount a stepper directly to the 13mm shaft on the C5 focuser. 
  • got a flat panel to start adding flat correction to my images

 

 

had a short window of stars last night to give it all a try and was able to get two quick targets before the clouds rolled in. 

 

 

Setup was C5 with 0.63 and starsweeper reducers (solved focal length 441), UV/IR cut, PlayerOne Mars-C (IMX462).

 

Darks and flats applied

 

M29, 4sx18, 

 

M29_16bits_18frames_72s.jpg

 

the whale was over in a bright area of the sky for me and the haze was getting pretty thick at that point. 

 

NGC 4631 Whale nebula 15sx40

 

Whale_40frames_600s_WithDS.jpg

 

Tracking was much improved at 15s compared to pre-maintenance. 

Autofocus is great, so nice to be able to do it from inside and not have any doubt if it could be better

I don't miss the bright circle and dust blobs.


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#49 bmcclana

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Posted 16 July 2021 - 08:55 PM

got out again for a short session last night.

 

Setup was C5 with 0.63 and starsweeper reducers, UV/IR cut, PlayerOne Mars-C (IMX462).

 

Removed one spacer and adjusted the spacing between the reducers to help with a close fit with my focus motor, now my vocal length solves as 462mm on the 127mm SCT so running at around f/3.6

 

NGC6888, Crescent  15sx40, Gain 250 

 

NGC6888_40frames_600s_WithDS.jpg

 

NGC7380, Wizard 15sx52, Gain 250 

 

NGC7380_52frames_780s_WithDS.jpg

 

 

I also realized that i had the stacking set to sigma clipping, i think that may have contributed to the noise in these and my previous images compared to last month. 

 

 

 

 


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#50 Mikehuerto

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Posted 17 July 2021 - 01:26 PM

I did the first part of the challenge sans mount while on  vacation. Just used a tripod to support an ASI 294MC pro attached to a Sigma Telephoto lens (100-400 mm), and a ZWO UV-IR cut filter in the camera, no cooling, no plate solving.

To start things off and orientate myself I threw on a Canon 18-55 mm lens to see where the bright nebula were in the Milky Way (no plate solving technology available)

 

 

 

18 mm lens

Milky Way containing targets M20, M8, NGC6334, NGC6357

10 x 15 secs 200 Gain 

Canon 18 mm lens

Zwo IR Cut filter

25 X Darks and 25 flats subtracted in SC

Sharp Cap 4 DisplayStretch

Manfrotto 55Pro mount

No cropping

 

All Images taken over the 2 nights of July 15 and 16 just north of Alcabesse, Castellon, Spain. A beautiful location on the Mediterranean. Unfortunately, I couldn't fit my 14 inch Dobson in the car  without leaving the dog or family at home! And besides I have a huge hill just to the south of my house which blocks everything below about 20 degrees! So this was a great chance to capture some low southern targets.  Need to try this tripod set-up at the top of this hill, or buy at portable alt/az mount!

 

The following posts show M20, M8, NGC6334 and NGC6357 taken with a 100-400 sigma telephoto - I had bit of a struggle with the focus, but I am pleased with the overall presentation. This was a lot of fun and a great way of getting to know the position of targets by eyeballing them - sort of aim and shoot. I found myself, stacking a few images to check the target, and then tweaking the camera on the tripod to try and center the target. Have to be careful with the TF when you move it, not to disturb the focus - I think I'll try and rely on the SC FWHM focus numbers to fine tune focus next time.

Attached is also a screenshot after 52 seconds with the lagoon nebula - not quite centered!

Attached Thumbnails

  • Stack_10frames_150s_WithDisplayStretch copy.jpg
  • 7dda3998-2627-40b6-ac4e-45f5e290f779.jpg

Edited by Mikehuerto, 17 July 2021 - 01:55 PM.

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