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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 18 Dec 2008 (Thursday) 10:01
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Challenge #2 - M45, The Pleiades.

 
Adrena1in
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Dec 18, 2008 10:01 |  #1

Hi all,

Congratulations to RLD for winning Challenge #1, with his excellent photo of the moon, Venus and Jupiter.

RLD's nomination for the subject of Challenge #2 is star cluster M45, The Pleiades, or Seven Sisters. (Also known as Subaru in Japan, so this is appropriate, what with Subaru withdrawing from Rallying recently.)

Don't worry about images you've seen in the past of M45. Deep exposures show glorious swirls of blue reflection nebulosity. But you don't need to reveal this to get a good image. M45 still looks good in widefield images, or as just a quick exposure revealing the seven sisters. (I took some shots at 600mm the other night, and was able to see the stars with very quick (sub 1-second) exposures.)

Here's a link to some details on M45 if you need them.
http://en.wikipedia.or​g/wiki/Pleiades_(star_​cluster (external link))

We've decided that images taken in the past are allowable, to try and get as many entrants as possible. You have to have taken the image yourself of course!

I was going to suggest we let this run until midnight on new years eve. Ideally it would be nice if we could get one challenge each month, starting on the first day of the month and ending on the last day. The winner of the M45 challenge will choose the target for February, while an additional target, (will perhaps take suggestions on what that could be), shall be the January challenge. Does that makes sense?

Anyway, good luck with shooting M45, (unless you're digging out a previous photo), and post the submission here.

Thanks, and Clear Skies,
Tim.


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Sorarse
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Dec 18, 2008 16:49 |  #2

Sounds good. Keep my fingers crossed for clear skies, as the only photo I have at the moment is of M42 (and several of the moon).


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Celestron
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Dec 18, 2008 18:44 |  #3

Going from first of month to last would be a very convient idea . I have had clouds alot lately and alot coming up between now and the Jan 1 so i'll be lucky if i even get to scope . Maybe a WF if possible depending the weather . But however sounds like a good challenge even if i only get to see whats posted here .




  
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chris.bailey
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Dec 19, 2008 02:11 |  #4

Sorarse wrote in post #6904689 (external link)
Sounds good. Keep my fingers crossed for clear skies, as the only photo I have at the moment is of M42 (and several of the moon).

Yeah I am up for this one IF we get some clear sky between now and then. Need a good night for M45 to have a chance of picking out some of those finer filaments.




  
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strgazr27
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Dec 19, 2008 08:06 |  #5

This was taken with my 7" f/4 Astrograph and the 40D.

Image Spec:

52 X 300 sec
ISO800
CLS/CCD Light Pollution Filter
7" f/4
Modified 40D
Stacked with Registar
Converted and calibrated in Images Plus
Post processing with PSCS2

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/png' | Redirected to error image by ZENFOLIO PROTECTED

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FarmerDave8N
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Dec 19, 2008 09:41 |  #6

[QUOTE=strgazr27;69080​62]This was taken with my 7" f/4 Astrograph and the 40D.
HAH! As soon as I saw the target, I *knew* you were going to use this photo! Excellent. :)


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FarmerDave8N
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Dec 19, 2008 10:12 |  #7

Hmmm, munged the quote in that last message, and now it won't let me edit it. If a mod could delete it for me, that would be great!

strgazr27 wrote in post #6908062 (external link)
This was taken with my 7" f/4 Astrograph and the 40D.

HAH! As soon as I saw the target, I *knew* you were going to use this photo! Excellent.


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kaitanium
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Dec 19, 2008 12:39 |  #8

strgazr27 wrote in post #6908062 (external link)
This was taken with my 7" f/4 Astrograph and the 40D.

Image Spec:

52 X 300 sec
ISO800
CLS/CCD Light Pollution Filter
7" f/4
Modified 40D
Stacked with Registar
Converted and calibrated in Images Plus
Post processing with PSCS2

IMAGE NOT FOUND
HTTP response: NOT FOUND | MIME changed to 'image/png' | Redirected to error image by ZENFOLIO PROTECTED



dannnnnggg. so i could do this too on my 8in cpc800? amazing!!
was that a combo of 4 hrs of shooting? (if i did my math right)




  
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Nighthound
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Dec 19, 2008 13:43 as a reply to  @ kaitanium's post |  #9

Wow, that's deep Bobby. Beautiful work.

Since this object is a better late fall object for the locations I shoot I likely won't get a chance in the next couple weeks to better my last attempt. My goal is to eventually get a good 5 hours on this one.

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kaitanium
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Dec 19, 2008 14:22 |  #10

O_O




  
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BobOh
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Dec 19, 2008 14:50 |  #11

Nighthound wrote in post #6909857 (external link)
Takahashi Sky 90 II / Losmandy G-11 wGemini / Canon 20D(unmod) @ ISO 1600 / 26 x 240 sec. exposures unguided / Noel's Astro Tools

Nighthound, I've seen it before in your posts. What do you mean by "unguided"?


Regards,
Bob
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Nighthound
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Dec 19, 2008 15:05 |  #12

BobOh wrote in post #6910275 (external link)
Nighthound, I've seen it before in your posts. What do you mean by "unguided"?

It means I'm not using any means of tracking correction, i.e. a guide scope/camera or by manually guiding. The mount is still tracking in sidereal, I'm just not assisting the mounts tracking software by sending corrections to help it stay put so that no movement is detected in the images. A very careful balance and alignment(and drift alignment) is necessary to get the mount prepared for unguided exposures. I also replaced my mount's factory worm gears with high precision gears and spent a lot of time getting them adjusted to where they are today. I'm only shooting at 407mm FL so 4 minutes unguided is not really a huge accomplishment, but I'll take it on those nights when I'm too lazy to mess with a guide scope, camera and laptop in the field.


Steve
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BobOh
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Dec 19, 2008 15:25 |  #13

Thanks for the info. I didn't realize that extra correction is often needed for the tracking. Beautiful shots you post up BTW.


Regards,
Bob
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Adrena1in
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Dec 20, 2008 11:01 |  #14

BobOh wrote in post #6910458 (external link)
I didn't realize that extra correction is often needed for the tracking.

If you have perfect tracking then guiding isn't necessary, but it's hard to get it perfect. Having a second scope tracking a star, and feeding back to the mount to adjust accordingly, means you can pretty much expose for as long as you like and the target will remain stationery.

Oh, and sweet jeezHUZZ, those images are stunning you guys. :cool:


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kaitanium
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Dec 20, 2008 11:58 |  #15

i wanna be just like you guys when i grow up




  
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Challenge #2 - M45, The Pleiades.
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