The "Image of the Month" for October 2004 is now online at the Astrometrica web site, http://www.astrometrica.at. Click on the thumbnail image on the menu bar...
Just a test email to say hi to everyone and thanks to Alan Cahill to introducing me to this superb software. A first quick question, what is the normal length...
As you say, it really depends on many factors. Majority of the results I was able to report to the MPC were obtained with 30 - 120 s exposures using a Meade...
Ladislav, thanks for all the info. The more the better as far as I'm concerned. I think your email will be short compared to some I have written lately on this...
Welcome John, I use a LX200 10" GPS w/ HX916 binned 2x2 at F11. At the moment, I tend to shoot 1 min or 2min integrations, so I really don't have a need for...
Bob, that's great info. Thanks a lot. I will get straight on to that URL to see what it has for me. Is there a danger of when revisiting a region of sky a day...
Simple calculation shows that 300 mm aperture should give you 1.44 times more light than my (former) 250mm aperture. That is not quite 1 magnitude (each...
The general rule (more practical than fundamental) is to get at least two, preferably more images during one night. As for subsequent nights, cataloged ...
John, That's a great question. These buckaroo's move a lot! In my case, I have a FOV of about 11 arcmins. If I'm watching a mover that is moving 120"/hr, ...
Go to the Sky and Telescope Magazine and get CCDLIM2.bas at http://skyandtelescope.com/resources/software/article_326_2.asp If you can read the article on CCD...
The last MPAPW had a presentation on track and stack limiting magnitude, exposure length, and number of images to stack. It should give a good starting point....
Should be "If you can find the article to read" Not "If you can read the article" ... From: David Dixon [mailto:ddixon@...] Sent: Sunday, October 03,...
I guess they use track and stack. With a 0.25 LX200 I have never been able to get anything beyond mag 18. ... From: David Dixon [mailto:ddixon@...] ...
The Astrometrica log is useful but lot depends on the catalog one is using and the magnitude limit set by Astrometrica. The USNO A2.0 catalog (the largest but...
David, thanks for the link. Sorry for sounding dumb but this looks like Basic program code. How do I get to compile it or run it in such a way that it prompts...
You are correct it is an old basic program no GUI just plan old command line basic. Sorry to have to date myself but you should be able to find one of the old...
For NEO confirmation, most of these are moving fast enough that exposures are limited to maybe 15 to 120 seconds. My scope won't track accurately past about 1...
... It increases the sensitivity a bit, because there is less readout noise in reading a 2X2 pixel as opposed to reading the 4 individual pixels separately. ...
... Get yourself a focal reducer. Getting the image scale to around 2"/pixel will increases sensitivity, and give you a much wider field. Going coarser than...
Help! I have downloaded the Astrometrica program. In general it works very well and should be ideal for hunting asteroids etc once I get my head around it. The...
I concur completely. All the results I reported to MPC (less than hundred of them, alas.) were obtained with f/6.3 reducer with almost exactly 2 arcsecs/pixel....
In order to match the star pattern, the program needs to know the image scale in arcseconds/pixel, so use the default values for scope focal length and CCD...
I haven't used the program in awhile, but I seem to recall that if you chose not to delete the log file at start up all new data will be appended to the end of...
That is exactly the case. After a lot or astrometry with hundreds of reference stars the log becomes quite large. I personally would like an option to rename...
Thanks John, Ladislav, Scott, Dave and Bob (and anyone I might have missed) for all your input. Regards John ... From: John Mahony [mailto:jmmahony@...] ...
I ran into an odd problem tonight. Trying to use USNO-B from VizieR in Astrometrica, it would connect, but then nothing would happen, and after about 15...
I just returned to astrometry with Astrometrica after some hiatus. I encountered the following problem: CCD images (with SBIG ST8 binned 2x2 and 11" scope with...
... I think Herbert now looks at XBINNING and YBINNING keywords in the FITS header. Please check whether or not your files contain them. "almost exactly twice"...
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