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New Horizon Cameras
Guest_vjkane2000_*
post Apr 22 2005, 03:57 AM
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I've been wondering what the focal lengths are for the two New Horizon cameras (Ralph and Lorri). Curious to know how much Alan et al. were able to squeeze into their weight budget.
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gpurcell
post Apr 22 2005, 07:14 PM
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QUOTE (vjkane2000 @ Apr 22 2005, 03:57 AM)
I've been wondering what the focal lengths are for the two New Horizon cameras (Ralph and Lorri).  Curious to know how much Alan et al. were able to squeeze into their weight budget.
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And will they have a way to focus 'em if the bake off doesn't fit the modeling profile!
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Bob Shaw
post Apr 22 2005, 08:07 PM
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The sad thing about the optical calibration issues that appear to be cropping up on so many current/future missions is that 35 years ago, they had the thing done and dusted:

http://members.tripod.com/petermasek/mariner9.html

"...star images were taken during the interplanetary cruise and also while orbiting Mars to determine and then monitor other geometric properties of the cameras. The narrow angle camera had a detection threshold of 9th visual magnitude, enabling at least a few stars to be imaged in any long exposure picture. Focal lengths and relative camera alignments were computed from the star images and were found to be stable to an accuracy of a pixel throughout the mission."

Of course, that was before all the fun with Hubble!

You'd think, though, that after Hubble, and MCO, and Genesis there's be a sorta checklist cum diary on each of the mission staff's desks - you know, things like:

* Fix Focus by Friday
* Go Metric on Monday
* Set pyros after Sunday (AKA This Way Up on Wednesday!)


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hendric
post Sep 12 2005, 08:39 AM
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QUOTE (Bob Shaw @ Apr 22 2005, 08:07 PM)
The sad thing about the optical calibration issues that appear to be cropping up on so many current/future missions is that 35 years ago, they had the thing done and dusted:

http://members.tripod.com/petermasek/mariner9.html

*


Well, I'd bet $10 that the pixels now are at least an order of magnitude smaller, if not more, than the pixels for Mariner 9. I'd bet $1 they're 2 or more.


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Posts in this topic
- vjkane2000   New Horizon Cameras   Apr 22 2005, 03:57 AM
- - gpurcell   QUOTE (vjkane2000 @ Apr 22 2005, 03:57 AM)I...   Apr 22 2005, 07:14 PM
|- - Bob Shaw   The sad thing about the optical calibration issues...   Apr 22 2005, 08:07 PM
||- - hendric   QUOTE (Bob Shaw @ Apr 22 2005, 08:07 PM)The s...   Sep 12 2005, 08:39 AM
|- - aharris   QUOTE (gpurcell @ Apr 22 2005, 02:14 PM)And w...   Sep 8 2005, 03:42 AM
- - edstrick   The Mariner 4 images of Mars were badly degraded b...   Sep 12 2005, 09:13 AM
|- - tedstryk   QUOTE (edstrick @ Sep 12 2005, 09:13 AM)but:...   Sep 12 2005, 10:20 AM
|- - Bob Shaw   I take the point regarding the steep learning curv...   Sep 12 2005, 08:22 PM
- - edstrick   Bob Shaw: "... but it doesn't change the...   Sep 12 2005, 08:44 PM
|- - tedstryk   QUOTE (edstrick @ Sep 12 2005, 08:44 PM)Fogge...   Sep 12 2005, 10:06 PM
|- - mcaplinger   QUOTE (edstrick @ Sep 12 2005, 12:44 PM)Bob S...   Sep 13 2005, 09:42 PM
||- - Bob Shaw   QUOTE (mcaplinger @ Sep 13 2005, 10:42 PM)I d...   Sep 14 2005, 09:44 AM
||- - dvandorn   QUOTE (Bob Shaw @ Sep 14 2005, 04:44 AM)The f...   Sep 14 2005, 10:00 AM
|- - RNeuhaus   QUOTE (edstrick @ Sep 12 2005, 03:44 PM)...be...   Sep 14 2005, 08:40 PM
- - edstrick   The Deep Impact defocus problem has distinct simil...   Sep 14 2005, 09:58 AM
|- - tedstryk   QUOTE (edstrick @ Sep 14 2005, 09:58 AM)Sadly...   Sep 14 2005, 01:18 PM
- - edstrick   Anyway.... there's essentially no such thing a...   Sep 14 2005, 10:45 AM
- - djellison   I think the MRI, as with the impactor camera ( the...   Sep 14 2005, 01:23 PM
|- - um3k   QUOTE (djellison @ Sep 14 2005, 09:23 AM)I th...   Sep 14 2005, 03:34 PM
- - djellison   Oo - my bad, thought it was a straight copy. Perha...   Sep 14 2005, 03:47 PM
- - BruceMoomaw   I've heard nothing to suggest that they didn...   Sep 14 2005, 07:55 PM
|- - tedstryk   In addition, if they can get what appear to be col...   Sep 14 2005, 08:32 PM
- - BruceMoomaw   The article on Deep Impact imaging of geological f...   Sep 15 2005, 06:16 AM
- - djellison   Well - I saw a reasonable colour image at the BAA ...   Sep 15 2005, 07:11 AM
- - edstrick   Bruce Moomaw: ".... -- if, of course, there a...   Sep 15 2005, 08:02 AM


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