Hi to all! I use a very small CCD (SBIG ST5) with a focal length of 914mm with a C8. My FOV is only 12'x9'. So Astrometrica could not find, very often the ...
Juergen: You don't mention your typical exposure length or the magnitudes limits on the reference stars you are observing. If the exposures are too short ...
12x9 shouldn't be too little to get good matches. UCAC2 won't solve it, it is less denser than USNO B1. Do you expose long enough? Are detection sigma and...
Juergen, sorry - I see I misspelled your name first post. Bob ... From: Juergen To: Astrometrica@yahoogroups.com Sent: Saturday, January 05, 2008 6:18 AM ...
Hi Bob! Thanks or answering! Bye Juergen ... ST5 for use with their field reducer. ... with the equipment needed to obtain a fov of something like 24 x 18 or ...
The ST-5 has a 320 by 240 CCD array as I remember at a focal length of 914mm you are at a pixel scale of 2.26 arcsec/pixel if you were to get to a FOV of 24 by...
Hi David! My FOV is 12x9' and I'll looking forward to use a FOV to about 17x13' were it is a focal length of about 600mm. Bob has used the doubled field. The...
David, I think your calculations are not quite accurate. Total FOV of a given configuration is determined only by the size of the chip (4 mm diagonal in the...
... in the case of ST-5) and the focal length (914 mm). ... is correct - about 2.25 arcesc/pixel, usually considered ... be reached with the ST-5 and focal...
And, as David points out, the increase in arc/sec per pixel makes the focal reducer solution not a very good one for ST5. I think Optec had in mind applying...
I probably wrote the message to indicate I am still alive and not COMPLETELY gone. Thanks for gentle comment. LN ... From: Astrometrica@yahoogroups.com...
Hi, Sorry! I dont say that I have a 24x18 field with 914mm! Its a 12x9 FOV! Bob means that I can look for a telecompressor to reach a 24x18 FOV. This ist a...
At one time I used an ST-5 with a C8 as well but at f/5 with "approx" a 2"/pixel and a field of about 6'x4'. Now that is a small field; but I always got a...
... With CCD it would depend on the size of your pixels. As others have pointed out, 2"/pixel is a good rule of thumb for a balance between wide FOV and...
Dear Herbert Raab: Hello! We are interested in serching asteroids and recommeded to use the Astrometrica.We have tried and fing it very usefull.However we have...
Hello lixing wang, I would recommend that you set the number of stars for the reference star map in the program settings to zero. The program will then ask you...
Hello Herbert Thank you for your reply.I have set the number of stars for the reference star map in the program settings to zero and tried the manual match but...
Sorry for ‘barging’ in. Most of us had identical problems with our reference star match at the beginning. My main problem was incorrect focal length I put...
In the program setting you can set a "margin of error" for position, focal length, and image rotation angle. Set these large to start with. After finding a...
Lixin sent me a copy of the image and I was able to reduce it; finding an unusual rotation among other factors. I've asked Lixin for some further information...
Thanks John and Bob for mentioning of original large error settings for both focal length and angle. That – more than anything else – got me going some...
As John predicted, Lixin's image(s) needed to be flipped both horizontally and vertically. In addition, the rotation value of the image was about 351 degrees....
... horizontally and vertically. Which is the same as rotating by 180 degrees. ... about 351 degrees. or 171, if you don't "un-flip" it. ... (sq). I saw the...
Hello! We are thankful for everyone's help.We are doing according to the guidances.We wish we can astrometry ein/zwei/drei as Herbert may say and share the joy...
The ASCOM Initiative, now in its 10th year, is pleased to announce the ASCOM Platform 2008 and an all-new ASCOM web site. The new Platform includes extensive ...
Dear friends: I have no much experience in Astrometrica. I have ten FITS images and I want align them and stack them to increase the SNR ratio for stars. I...
... Just a short note that Astrometrica's reference star match also works with images that are rotated by 180°. However, it does not work with images that are...
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