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EPOXI Mission News
machi
post Nov 16 2011, 12:40 AM
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QUOTE (ElkGroveDan @ Nov 15 2011, 03:47 PM) *
Maybe one of us could mail you a DVD next time biggrin.gif


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. smile.gif

QUOTE (ugordan @ Nov 15 2011, 07:40 PM) *
Here's my take on the M51 set...


Superb work!


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hendric
post Nov 16 2011, 08:32 PM
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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


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stevesliva
post Nov 16 2011, 08:40 PM
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Cool!
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machi
post Nov 18 2011, 06:24 PM
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Finally now I have all M51 images and as others I worked with this set, because galaxies are cool smile.gif.
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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NGC3314
post Nov 21 2011, 03:01 PM
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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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Paolo
post Dec 1 2011, 09:21 PM
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NASA's Deep Impact Spacecraft Eyes the Future
any idea of what is the "solar system small body" targeted?


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hendric
post Dec 5 2011, 05:19 AM
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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.


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Bjorn Jonsson
post Dec 5 2011, 09:35 AM
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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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machi
post Dec 5 2011, 09:40 AM
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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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elakdawalla
post Dec 5 2011, 03:17 PM
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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.


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hendric
post Dec 7 2011, 08:00 PM
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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. :^)


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Holder of the Tw...
post Dec 16 2011, 10:46 PM
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QUOTE (Paolo @ Dec 1 2011, 03:21 PM) *
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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Paolo
post Dec 17 2011, 10:16 AM
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QUOTE (Holder of the Two Leashes @ Dec 16 2011, 11:46 PM) *
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",


good catch!!!


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Paolo
post Dec 17 2011, 11:25 AM
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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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SFJCody
post Dec 17 2011, 12:46 PM
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Access to this kind of info is why I love UMSF. smile.gif
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