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What's the faintest thing you've imaged

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#1 OliverToth

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Posted 18 July 2019 - 05:11 AM

There might already be a topic about this but I haven't found one, tell us how deep you went, share an image and maybe tell us a bit about the object you've observed (also try to include the magnitude if you can)

#2 CharlesC

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Posted 18 July 2019 - 06:01 AM

Magnitude 17 objects that are points of light is deepest I've seen with EAA and 6" SCT at dark site.  Most interesting object with a discernible shape is galaxy IC4617 at magnitude 15.2 near M13.  You can actually see its shape as galaxy on edge at 503MLY away. Age is interesting as that is boundary when life first emerged from the oceans. There were no animal or plants on land 500 million years ago so light we receive started its journey when Earth was a barren rock with only lichen and fungi.


Edited by CharlesC, 18 July 2019 - 08:31 PM.

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#3 Don Rudny

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Posted 18 July 2019 - 05:10 PM

One catalogue of objects that I find interesting is the Hickson Compact Groups that lists 100 galaxy clusters.  The dimmest is HCG 50 in Ursa Major.  I viewed it a few years ago using a Lodestar X2c with, at the time, Lodestar Live software.  The mags run from 18.7 to 20 for the five galaxies that are probably over 2bly away.  The scope was my M8 @ f/6.3 and the exposure was only 7 stacks of 30s subs.  I was really thrilled when I first saw this.  Reiner Vogel has a report on visually viewing all 100 Hickson’s.  Here’s what he wrote about HCG 50 viewed with a 22” f/4 scope:

 

“This is by far the most difficult group in the Hickson Catalog! There are positive observations with 30" and up. Here are my own (negative) notes:
(2008) Star at the southwest border seen intermittently with indirect vision, no galaxies seen, did not try to push it excessively
(03/2009) upon re-observation with 500x (f/4.5, 5mm) with both good seeing and good transparency, the star pattern leading to HCG50 could be held steadily and also the star immediately SW of the group could be held about 50% of the time with indirect vision. I spent about 20minutes with this object to see how far I could get. Twice, a stellar object "twinkled" at the position of b (which is *not* the brightest member) over time. Well, this happens every once in a while if you stare extendedly into apparently empty dark space and belongs to the category "averted imagination" :-)”

 

Here is a link to Reiner’s information on Hicksons.

 

http://www.reinervog.../hickson_e.html

 

Here is my capture.  No post processing except for the circle locator.

 

F55B6F69-15DE-4F1B-8C67-5B0D04AA9068.jpeg

 

 


Edited by Don Rudny, 18 July 2019 - 05:11 PM.

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#4 OliverToth

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Posted 18 July 2019 - 05:23 PM

Oh wow amazing, the Hickson groups are something I really want to observe, have you observed the other ones too? (If yes how many?)

#5 OliverToth

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Posted 18 July 2019 - 05:24 PM

Oh yes IC 4617, I should try spotting It visually, I've actually never tried it should be really easy to find

#6 Don Rudny

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Posted 18 July 2019 - 05:35 PM

Oh wow amazing, the Hickson groups are something I really want to observe, have you observed the other ones too? (If yes how many?)

I think about 30-40.  Some are pretty easy and have NGC numbers.  Download Reiner’s report on all 100 from the site I listed.  He does a good job of describing observation and how to find them.



#7 OliverToth

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Posted 18 July 2019 - 05:40 PM

That's great, I'll be sure to image them once I get my setup next spring (rn I can only do visual but I'm saving up)

#8 bdyer22

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Posted 18 July 2019 - 06:11 PM

PGC 4959 a 17th magnitude Spiral Galaxy with an 80mm refractor and LodestarX2 mono and StarlightLive 3.3 from my suburban front yard.  Not sure I've got any mag 18 objects yet.

 

It's the rightmost object in the upper corner

NGC.507 2017.10.22 22.52.47 annotated

Edited by bdyer22, 18 July 2019 - 06:12 PM.

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#9 OliverToth

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Posted 18 July 2019 - 06:25 PM

Seeing PGC and UGC galaxies is always a pleasure, it's not something you're used to observing visually

#10 Larry Mc

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Posted 18 July 2019 - 10:06 PM

hi,

My 'deepest' image was from a couple of years ago using my 8" SCT optical tube @ f3.3 on a CGem mount, with a StellaCam-3 1/2" monochrome CCD @ 240 second single exposure. (I was recreating the Quasar observation from the October 2017 Sky & Tel)

Here's the image of Arp284 (NGC7714 & 7715), 16-Piscium, and the Quasar at mag+ 18.1 for 10 billion LY.

(post processing consisted of tweaking the brightness/contrast a little, and adding text and the big arrow).

Attached Thumbnails

  • Arp284-16piscium-quasar-09222017.jpg

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#11 OliverToth

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Posted 19 July 2019 - 03:05 AM

Oh yes quasars are often the furthest you can go, and you, how many arps have you seen ?

#12 Larry Mc

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Posted 19 July 2019 - 09:18 AM

hi Oliver,

Yes, there's a lot of faint detail that can be pulled out of Arp galaxies using videoastronomy. So far, I've videocaptured 106 out of 338 objects, and I have a webpage on that project: http://www.stellar-j...g/arpgalaxy.htm

 

I've also been working my way thru the Abell Planetary nebula, (there's some pretty faint ones Mag+ 16 & 17), using my StellaCam-3 and have captured 22 out of 82 objects. http://www.stellar-j...llplanetary.htm

 

Unfortunately, the weather has really hampered my dark-sky observing sessions this year, so I've not been able to add any new video-observations to either of these projects. For the few good nights that I've had so far, I've been focused on trying to complete my main survey project of all the Herschel Objects. I currently have either video-captured or visually sketched 2,323 of the Herschel Objects. (from my list of 2,482 total objects). While I don't have a specific page for all of the Herschel's, I do have a page for the Herschel-400:   http://www.stellar-j...rschel-tour.htm  But, all Herschel Object observations can be found in their individual constellations under my 'Constellation Tour' page: http://www.stellar-j...ationtour1.htm  and eventually I'll get around to rewriting the Herschel-400 page to include them all.

 

Oh, and besides all the cloudy weather, it hasn't helped that I got a new color camera, a ZWO ASI294MC Pro, that's been taking away from my project observing time.

Having too much fun re-imaging previously captured objects and learning how to use a color camera and the Livestack feature in SharpCap.

http://www.stellar-j...gallerytour.htm

 

Too many deep-sky objects, not enough Telescope.gif time!

 


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#13 OliverToth

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Posted 19 July 2019 - 10:18 AM

Great website Larry, I'm sure you'll have a lot of fun with the new cam (I will also be getting the same one actually :D) ****, so of those Abell nebulae are super faint, great job picking them up with your equipment, will you also be trying the other ones once the conditions improve? (Abell 61, 66, 74, 45, 31, 7, 28, 19 and 25 look especially tough)



#14 Larry Mc

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Posted 19 July 2019 - 03:06 PM

Thanks!
Yep, I'm hoping for some quality dark-sky this fall at the Black Forest Star Party to dive back into the Abells and Arps.
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#15 roelb

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Posted 19 July 2019 - 04:45 PM

hi Oliver,

Yes, there's a lot of faint detail that can be pulled out of Arp galaxies using videoastronomy. So far, I've videocaptured 106 out of 338 objects, and I have a webpage on that project: http://www.stellar-j...g/arpgalaxy.htm

 

I've also been working my way thru the Abell Planetary nebula, (there's some pretty faint ones Mag+ 16 & 17), using my StellaCam-3 and have captured 22 out of 82 objects. http://www.stellar-j...llplanetary.htm

 

Unfortunately, the weather has really hampered my dark-sky observing sessions this year, so I've not been able to add any new video-observations to either of these projects. For the few good nights that I've had so far, I've been focused on trying to complete my main survey project of all the Herschel Objects. I currently have either video-captured or visually sketched 2,323 of the Herschel Objects. (from my list of 2,482 total objects). While I don't have a specific page for all of the Herschel's, I do have a page for the Herschel-400:   http://www.stellar-j...rschel-tour.htm  But, all Herschel Object observations can be found in their individual constellations under my 'Constellation Tour' page: http://www.stellar-j...ationtour1.htm  and eventually I'll get around to rewriting the Herschel-400 page to include them all.

 

Oh, and besides all the cloudy weather, it hasn't helped that I got a new color camera, a ZWO ASI294MC Pro, that's been taking away from my project observing time.

Having too much fun re-imaging previously captured objects and learning how to use a color camera and the Livestack feature in SharpCap.

http://www.stellar-j...gallerytour.htm

 

Too many deep-sky objects, not enough Telescope.gif time!

Nice info Larry.

The link to the "Constellation Tour" page seems not to work?



#16 Larry Mc

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Posted 19 July 2019 - 05:08 PM

Thanks!
Yep, I think the constellations link got corrupted when I pasted it in. Let me try again.

http://www.stellar-j...lationtour1.htm
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#17 OliverToth

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Posted 19 July 2019 - 05:12 PM

what about you roelb? I haven't done any yet sadly (but one of the faintest things I've seen with my 10" is the entire deer lick group) 



#18 roelb

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Posted 19 July 2019 - 05:25 PM

Last year I was also busy with the Arp catalogue. Up to now I have about 210 objects captured.

I'm also imaging the Herschell 400-II objects.

It is hardly to find the faintest that I was able to image, but here is an example:

PGC 67244   M +17.9  0.3-0.2 arcsec

Evolution 8" @ F/5 with ASI290MM

15 x 10 s

 

PGC 67235-239-243-246_ZWO ASI290MM(53045621)_Stack 15 frames_Tot.Exp. 150s_2018-09-16T00_32_54_Annotated.jpg


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#19 roelb

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Posted 19 July 2019 - 05:27 PM

Thanks!
Yep, I think the constellations link got corrupted when I pasted it in. Let me try again.

http://www.stellar-j...lationtour1.htm

Amazing job Larrywaytogo.gif




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