EPOXI Mission News |
EPOXI Mission News |
Nov 16 2011, 12:40 AM
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#316
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Maybe one of us could mail you a DVD next time It's nothing more than some temporary wait, after all, this is the norm in planetary community (downloading data from another planet take some time) and still it's quicker than connection from New Horizon to Earth. Here's my take on the M51 set... Superb work! -------------------- |
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Nov 16 2011, 08:32 PM
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#317
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Director of Galilean Photography Group: Members Posts: 896 Joined: 15-July 04 From: Austin, TX Member No.: 93 |
FYI, the supernova in M51 shows up very well in that picture.
It's the bright star on the left side in the outer arm. http://www.universetoday.com/wp-content/up..._M51L300002.jpg -------------------- Space Enthusiast Richard Hendricks
-- "The engineers, as usual, made a tremendous fuss. Again as usual, they did the job in half the time they had dismissed as being absolutely impossible." --Rescue Party, Arthur C Clarke Mother Nature is the final inspector of all quality. |
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Nov 16 2011, 08:40 PM
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#318
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Senior Member Group: Members Posts: 1582 Joined: 14-October 05 From: Vermont Member No.: 530 |
Cool!
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Nov 18 2011, 06:24 PM
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#319
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Finally now I have all M51 images and as others I worked with this set, because galaxies are cool .
I used filters 514, 750 and 950 nm as blue, green and red. Luminosity from clear images (as Ugordan). Data Credit: NASA/JPL-Caltech/UMD Processing by: Daniel Macháček Data from http://epoxi.umd.edu/3gallery/deepsky_challenge.shtml -------------------- |
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Nov 21 2011, 03:01 PM
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#320
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Junior Member Group: Members Posts: 87 Joined: 9-November 07 Member No.: 3958 |
The color is a bit more garish in this rendition - noticing the filter 1 is clear and filter 5 is long-pass, I did a scaled difference to simulate a short-pass filter giving a better blue band (plus filter 4 for green and filter 5 as red) - recycled that idea from some STIS images I once put into a press release. Images were combined with 1.5-sigma clipping and a growing rejection radius of 2 pixels (IIRC) in IRAF. Intensity scale is logarithmic with a zero-point offset, a cheap way of mimicking the SDSS-style color mapping. If I get some more time to come back to these, I could see adding more features, such as:
- subsample on a 2x2 grid (his images look as if machi may have done that already) - use stellar colors to do a better scaling to get the blue difference band - align exposures with subinteger shifts, although that might affect the cosmic-ray rejection - improve the bias offset difference in each quadrant - that shows up if you look closely at the red sky background. - add a scaled fraction of the filter-7 violet image to get a better mean wavelength for the blue band, which really matters only for bright star-forming regions. Data Credit: NASA/JPL-Caltech/UMD FITS files from http://epoxi.umd.edu/3gallery/deepsky_challenge.shtml Bill Keel |
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Dec 1 2011, 09:21 PM
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#321
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
NASA's Deep Impact Spacecraft Eyes the Future
any idea of what is the "solar system small body" targeted? |
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Dec 5 2011, 05:19 AM
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#322
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Director of Galilean Photography Group: Members Posts: 896 Joined: 15-July 04 From: Austin, TX Member No.: 93 |
What are you guys using to process the EPOXI images? Most of the (free) software I've found doesn't seem able to handle the floating point FITS format in these files. The NRAO fits viewer can open the file, but only allows for 8 bit exporting.
-------------------- Space Enthusiast Richard Hendricks
-- "The engineers, as usual, made a tremendous fuss. Again as usual, they did the job in half the time they had dismissed as being absolutely impossible." --Rescue Party, Arthur C Clarke Mother Nature is the final inspector of all quality. |
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Dec 5 2011, 09:35 AM
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#323
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IMG to PNG GOD Group: Moderator Posts: 2250 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
See this message earlier in the thread (and I can add/confirm that IMG2PNG should be able to convert this to 16 bit PNGs).
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Dec 5 2011, 09:40 AM
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#324
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
It's simple answer. Björn's excellent img2png converter!
Img2png converts fits to three 16bit png images, but you need only one (which covers possibly all brightness levels). Then I worked with ImageJ. -------------------- |
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Dec 5 2011, 03:17 PM
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#325
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
I use FITS liberator. It used to be a plugin for Photoshop, but now it's a standalone piece of software. You can get really fine control over the way the histogram is manipulated (lots of different types of stretches) and output in 16 bit format. But if I have to get a preview of all files in a folder I use IMG2PNG.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Dec 7 2011, 08:00 PM
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#326
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Director of Galilean Photography Group: Members Posts: 896 Joined: 15-July 04 From: Austin, TX Member No.: 93 |
Thanks guys, I guess I spaced out on that or didn't go back enough posts. I'll give it a try this week and see if I can get color versions of the not-a-sexy-galaxy pics completed. :^)
-------------------- Space Enthusiast Richard Hendricks
-- "The engineers, as usual, made a tremendous fuss. Again as usual, they did the job in half the time they had dismissed as being absolutely impossible." --Rescue Party, Arthur C Clarke Mother Nature is the final inspector of all quality. |
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Dec 16 2011, 10:46 PM
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#327
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Member Group: Members Posts: 540 Joined: 17-November 05 From: Oklahoma Member No.: 557 |
any idea of what is the "solar system small body" targeted? The only possibility I'm aware of is the asteroid number 163249, designation 2002 GT. It is listed on the Aricebo radar schedule as a "Potential Deep Impact Target", with the possibility of planetary radar observations of said asteriod in June 2013. The link for the radar schedule is here. There may be other targets besides this one. I don't know where you would go to find out, though. The JPL orbit diagram for this asteriod, along with a lot of other info is here: LINK 2002 GT could be anywhere from 600 to 1300 meters diameter. Its taxonomic class (C type, S type) is unknown or unlisted. |
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Dec 17 2011, 10:16 AM
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#328
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
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Dec 17 2011, 11:25 AM
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#329
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
playing with JPL's Horizon I get a minimum distance between Deep Impact and 2002 GT of 0.242 AU on 8 January 2015, when the asteroid will be 1.07 AU from the Sun. Orbital data for Deep Impact do not seem to include the effect of the recent course correction.
EDIT: OK, I didn't see note #3 in Horizons output for Deep Impact: QUOTE Updated with 2011-Nov-29 retargetting maneuver to 2002 GT in 2019 running Horizons up to February 2020 (after which ephemeris for Deep Impact are no longer available) I get a flyby on 4 January 2020 |
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Dec 17 2011, 12:46 PM
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#330
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Member Group: Members Posts: 813 Joined: 8-February 04 From: Arabia Terra Member No.: 12 |
Access to this kind of info is why I love UMSF.
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