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DPChallenge Forums >> General Discussion >> The Ongoing Astronomy Thread.
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Showing posts 101 - 125 of 357, (reverse)
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10/18/2013 05:40:07 PM · #101
Watch live tonight. Slooh telescope has a live event if the sky's are clear. I've been out a couple times and not seen ISON yet.
10/23/2013 03:20:54 PM · #102
How To Make A True-Color Landsat 8 Image

An excellent tutorial covering combining individual channels into a color image, and the use of Curves and Levels (and why you'd want to use both), with links to high-resolution satellite data to "practice" with.

Originally posted by Linked Tutorial:

Levels and curves adjustments both allow manipulation of the brightness and contrast of an image, just in slightly different ways. I use both together for 16-bit imagery since the combination gives maximum flexibility. Levels provides the initial stretch, expanding the data to use the full range of values. Then I use curves to fine-tune the image, matching it to our nonlinear perception of light.
11/14/2013 09:18:52 PM · #103
If you are up early enough it is a good time to see a comet, ISON.
11/14/2013 09:53:45 PM · #104
Thanks Jm. There was another one right near it in the eastern sky about a week ago, that was brighter than Ison, but it's been cloudy here every night.
The other one is near Regulus. I saw an article about it but have not been able to find that article again. I believe I saw it in Sky News, or Space .com .

Message edited by author 2013-11-14 21:58:21.
11/15/2013 03:30:19 AM · #105
More comet ISON info.
11/15/2013 07:36:29 AM · #106
More on ISON from NASA

ISON observing campaign
11/15/2013 01:57:15 PM · #107
Two Comets to fly by Mercury
11/15/2013 03:04:24 PM · #108
Comet Lovejoy is out there this month too.
Comet Lovejoy 2013
For the techies, here's a good link for comet watchers.
Comet Weekly
Click on any of the comet names for detailed info or history of recent comets.

Message edited by author 2013-11-15 15:10:53.
11/15/2013 04:16:40 PM · #109
Was up and saw Comet Lovejoy. Did a drawing, composite of a photograph and what I could see in the small scope. ' . substr('//images.dpchallenge.com/images_portfolio/10000-14999/11769/120/Copyrighted_Image_Reuse_Prohibited_1092169.jpg', strrpos('//images.dpchallenge.com/images_portfolio/10000-14999/11769/120/Copyrighted_Image_Reuse_Prohibited_1092169.jpg', '/') + 1) . '

Couldn't see ISON, Fog and high clouds were just enough to obscure it.
Hopefully it will brighten even further.
11/20/2013 01:52:32 PM · #110
Came across another tutorial on using Photoshop to create Landsat images from the public-domain data.

And a tutorial using open source tools ...

Message edited by author 2013-11-20 13:58:34.
11/20/2013 10:07:32 PM · #111
' . substr('//images.dpchallenge.com/images_portfolio/0-4999/1031/120/Copyrighted_Image_Reuse_Prohibited_1093001.jpg', strrpos('//images.dpchallenge.com/images_portfolio/0-4999/1031/120/Copyrighted_Image_Reuse_Prohibited_1093001.jpg', '/') + 1) . ' Well, it took over an hour to download an "appropriate" data set, but those instructions seem to work perfectly ... though I haven't tried playing with the other bands (to create false-color images) yet. Here is a 100% crop, without the panchromatic (or any other) sharpening step described in the tutorial ...

' . substr('//images.dpchallenge.com/images_portfolio/0-4999/1031/120/Copyrighted_Image_Reuse_Prohibited_1093002.jpg', strrpos('//images.dpchallenge.com/images_portfolio/0-4999/1031/120/Copyrighted_Image_Reuse_Prohibited_1093002.jpg', '/') + 1) . '
11/22/2013 07:04:44 PM · #112
NOVA: At the Edge of Space -- program on sprites and auroras ... you can watch it online, some amazing photography.
11/22/2013 07:23:36 PM · #113
This is interesting. [url=Comet ISON interactive model]Comet ISON interactive model[/url], looks good for viewing the comet after it rounds the sun.
11/22/2013 07:24:05 PM · #114
Whoops
11/22/2013 07:25:05 PM · #115
ISON Here it is.
11/28/2013 03:20:24 PM · #116
RIP, Ison. Nov 28 2013
I guess we will not be getting any spectacular images of this one in Dec. The Sun has trashed it.
BBC, Science

Message edited by author 2013-11-28 15:29:03.
11/28/2013 06:03:11 PM · #117
To bad, was looking forward to seeing it after it rounded the sun. Spaceweather has a good update. Movie.
11/28/2013 10:35:43 PM · #118
Yup...got the alert from Spaceweather today...quite sad.

Originally posted by MelonMusketeer:

RIP, Ison. Nov 28 2013
I guess we will not be getting any spectacular images of this one in Dec. The Sun has trashed it.
BBC, Science
11/28/2013 10:44:11 PM · #119
Well, *something* came back out, but not what went in, LOL. Too bad we won't get a December show. But pretty darn cool anyway. We got to see the one and only trip that this one made in from the Oort cloud.
11/29/2013 02:49:30 PM · #120
This could be good news. Fingers crossed.
Video of the "something" emerging.
11/29/2013 03:19:09 PM · #121
Did the path change? From what I would tell, we should be able to view it in January.

Originally posted by kirbic:

Well, *something* came back out, but not what went in, LOL. Too bad we won't get a December show. But pretty darn cool anyway. We got to see the one and only trip that this one made in from the Oort cloud.
11/29/2013 07:06:40 PM · #122
For NASA, Black Hole Friday beats Black Friday deals (PBS News summary)
Originally posted by Linked Article:

If you're sick of everything Black Friday, NASA has an alternative: Black Hole Friday. Throughout the day, they'll be tweeting facts and images about black holes, and giving Black Friday forgoers a reason to celebrate.
11/29/2013 09:21:13 PM · #123
ISON lives, may get to see it yet.
11/30/2013 09:41:16 AM · #124
Dying again. :(
11/30/2013 01:00:33 PM · #125
Yeh, sure looks like it is curtains for ISON. Something survived, but it appears not for long. Truly, "what a long strange trip it's been."
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