Category Archives: Star Clusters

M67 Open Cluster – 6 Inch Newt at F/8, (1200 mm Focal Length)

M67 Open Cluster. Orion 6 inch, F/8 and RT Sony IMX224 eyepiece camera. 201 x 2 sec at gain 2650.  Up-scaled 200% in processing.

I purchased some rings and an extra-long dovetail bar for my Orion 6 inch, F/8 dobsonian and mounted it on the Atlas EQ-G.   It has a really narrow view with a Sony IMX224 chip camera, but its sharp and there was not much distortion throughout the entire field.

The newt lets you shoot with no filters and you pick up everything, including IR, with the standard clear filter that Rising Tech cameras ship with.    That’s great for galaxies.    Although this first test shot was not a galaxy, I hope to try it out on some, soon.

The rig is sensitive to balance and wind being the tube is so long and is also very sensitive to vibrations.   Since I was imaging next to a busy parking lot, I noticed lots of rejected frames in the SharpCap stacking program when the activity there increased.  Even loud noises would disturb it.   LoL.

Although conditions were not the best and the red zone light pollution I imaged through kept me from getting really deep, I did manage to do a few test shots before conditions deteriorated,

The above image was actually the second shot of the night, the first one being this unknown star field below that I shot to test the tracking.  It was a little difficult to dial-in a star to get a 3-star alignment on the mount, so I just went with seeing how long I could track with PHD2 Guiding at the same old settings I used with the TV-85 on a random star field.    8 sec exposures yielded too many rejected frames, so I went with 4 sec for this one.

Unknown star field. 70×4 sec @ Gain 2067, RT Sony IMX224 cam, 6″, F/8 newt, Atlas EQ-G w/EQMOD, PHD2 guiding w/Orion Ultra-mini and StarShoot.

Before the clouds came back and ruined my session, I was able to get 60×4 sec sub-images at the relatively high gain of 3108 of this open cluster in Gemini, called IC 2157:

IC 2157. 60×4 sec @ 3108 gain, RT Sony IMX224, 6 inch, F/8 Newt, Atlas EQ-G w/EQMOD.

Anyway, if I can get the tracking to get me up to 8 seconds of exposure, I will be able to shoot some of those tiny galaxies that my Televue TV-85 just can’t do justice to.

M35 and NGC 2158 Mosaic – Sony IMX224

M35 and NGC 2158 2-panel mosaic. Right half was taken on Dec 11, 2017. 275×8 sec and the left half was taken on Dec 13, 2017, 100×20 sec at 2098 and 1832 gain, respectively. Rising Tech Sony IMX224 cam with a Televue TV-85 at F/5.6.

As promised, here is the 2-panel mosaic of the M35/NGC 2158 area.    Not too bad, but the seeing for Dec 11 was poor and I might re-shoot the NGC 2158 side to get a better rendition.

Here’s the gaudy version that I turned up the contrast on with a strong curves boost:

M35 and NGC 2158 2-panel mosaic. Curves to boost contrast.

NGC 2158 and M35 (Partial)

NGC 2158 and part of M35 taken on Dec 11, 2017. 275×8 sec @ Gain 2098, SharpCap 2.9, RT Sony IMX224, Televue TV-85 at F/5.6. Resized to 200% in post processing.

I had in mind when starting this that I could get a mosaic going for M35 and its nearby companion, NGC 2158.    So, I started on NGC 2158 first since it is the more interesting cluster.     By the time I was finished, my window to shoot was just about over, so I moved on to something else and did not finish the mosaic.

What I did get came out OK for 8 second exposures.      I will probably go back to it the next time I use the Rising Tech Sony IMX224 eyepiece cam.    It is actually enjoyable watching SharpCap do live stacking with the short exposures.    Reminds me of the old days when I was doing mostly planetary imaging.   lol    🙂

EAA Roundup

M103 Open Cluster. 10×15 sec, 30×8 sec, 540×2 sec @ 2000 Gain. RT Sony IMX 224, TV-85 at F/5.6.
M15 Globular Cluster. 9×8 sec, 47×2 sec @ 2000 Gain. RT Sony IMX 224, TV-85 at F/5.6.
NGC 891 Edge-On Galaxy. 152×4 sec @ 2000 Gain. RT Sony IMX224, TV-85 at F/5.6.
Gamma Cass Ghost Nebula. 50×8 sec @ 2000 Gain. RT Sony IMX 224, TV-85 at F/5.6.
The Little Dumb Bell Nebula. 100×8 sec @ 2000 Gain. RT Sony IMX 224, TV-85 at F/5.6.

Here is a roundup of objects I was able to see during my most recent Electronically Assisted Astronomy (EAA) observing session.  These were taken in a Bortle Red zone and under a nearly full moon on Dec 1, 2017.

Cassiopeia Region Wide Angle

Cassiopeia region including M31, wide angle view. 6×300 sec @ ISO 1600, Sigma 28-70 Zoom at 28mm, F/2.8, Astronomic CLS filter. North is to the right in this view.

By luck I framed this one with M31 and the Cassiopeia region and got all the good nebulae that were in the area to boot.  You can see the Heart and Soul Nebulae, the PacMan Nebula, emission nebula NGC 7822, and other smaller nebulae like the one near Gamma Cass.    The Double Cluster is there along with lots of other open clusters.

It is not the best lens and I did do some distortion correction in PS.  It was a little difficult to process since this was the first time I used the Astronomik CLS filter.   Before, I had one light pollution filter and two cameras, so I finally got another one so they both have one.    All I need now is a small mount for light loads like the setup I used here and I could get two cameras going at the same time.   Yeah, buddy!  🙂

The Pleiades – Combined Data, 2011-2017

The Pleiades – Combined data from 2011 to 2017. TV-85 at F/5.6.

I took the very good Feb 2017 version of M45 and combined it with 3 other good images taken with the same scope as far back as 2011.   I still have more that I can add to it, but for now this will do.

Not satisfied with the first version above, I worked up a darker version with more contrast and noise reduction.

The Pleiades – Combined data from 2011 to 2017. TV-85 at F/5.6. Darker version.

Orion Nebula Up Close with a Toupcam

The Orion Nebula. 226 x 8 sec, Gain 350, Toupcam Aptina AR0130 Color Cam, Televue TV-85 at F/7.

It was Friday, March 3, 2017 and the weather was iffy for imaging at my dark sky location.  So, I decided to stay in town and try some short-exposure imaging with the Toupcam color planetary/guider cam I have.

I also wanted to try out an adapter I purchased for the Orion Star Shoot so that it can work with the Orion Ultra-Mini, 130mm, F/4.3 guider scope I’ve been using.   This worked better with PHD2 than I thought it would.  It seemed more accurate than the Toupcam with less dropped frames.   In fact, I’ll probably leave this as the permanent guider setup.

For the Toupcam, I used a two inch extension on the TV-85 at F/7, but I still had to let the cam and extension hang halfway out the focuser to even reach focus.   But, it was stable enough to try some simple targets like the Orion Nebula.

I used a software program called SharpCap for acquisition, dark subtraction and  stacking.   It worked well enough for M42,  but it had trouble with stacking dimmer objects like M46, an open cluster with plenty of stars in it.   I used IRIS to stack the individual frames manually for that one.

M46 Open Cluster, 60 x 8 sec, 350 gain, Toupcam AR0130 Color, TV-85 at F/7.

The last two images were tests of a relatively dim galaxies, like NGC 4565 and M64.  I only got 16 frames for NGC 4565, so it is not too special.   But, it shows the galaxy well enough to recognize what it is.   Like the previous image, it was also stacked manually in IRIS.

NGC 4565, 16 x 8 sec, 350 gain, Toupcam AR0130 Color Cam, TV-85 at F/7.

For my M64 dim galaxy test, I accumulated 38 frames @ 8 sec each.  It was also a test of using a video file format called .SER that was designed for astronomical imaging.   It is like a video file.  After I downloaded a SER viewer/player, which also let me export the frames out as TIF format, I was able to bring the data into IRIS and stack.

M64 Black Eyed galaxy. 38×8 sec, 350 gain, AR0130 Color Cam, TV-85 at F/7.

Omega Centauri Quick Peek

Omega Centauri. 3×300 sec @ ISO 1600, TV-85 at F/5.6, Canon T3, Atlas EQ-G w/EQMOD.

I really didn’t have time to shoot this like it should.  But, I just had to get a minimum of 3 shots of it since I could see it with my naked eye.    It was calling me.  lol

Later, I reworked the image to bring out more of the blues in terms of color balance:

Omega Centauri. 3×300 sec @ ISO 1600, TV-85 at F/5.6, Canon T3, Atlas EQ-G w/EQMOD.