I am sorry for the delay, but the "Image of the Month" for December 2004 is now finally online at the Astrometrica web site, http://www.astrometrica.at. Click...
Better than my image from Friday night. The comet is now quite bright (mag 6) and my FOV was too small and the exposure too short.. Thanks for the picture....
Hello I have not receiving e-mails by the group since 1 week. Are there any problem? Thanks Joan López...
JOAN LOPEZ
joanlp@...
Dec 6, 2004 10:34 am
2313
Hi Joan, Two messages went out yesterday... Before that the last message was on 27 Nov. We can be quiet at times... Especially after Full Moon. You might...
Hello, I'm currently undergoing change at my site; new scope, mount, PC networking.. Etc. One item that I haven't had a chance to look into as yet, but has...
Hello, These days I had a problem to recalculate a Minorplanetelongation to the true anomaly of the body in its eliptic sunorbit. It seems to be complicatet....
JsfKoeb@...
Dec 8, 2004 7:48 pm
2317
Scott: I am fairly sure you are going to have a problem, although the individual images may not show much field rotation I don't think that Astrometrica ...
Ok, I see Mead sells a field derotator; how does it work? Currently, my config. exist: x.5 reducer, flip mirror, and CCD. I'm planning on loosing the flip...
The derotator receives pointing information from the CPU in an LX200 telescope and phyically rotates the camera at a rate to cancel the field rotation. The...
Yes, shortly after I sent my last message I took a look at the price. I can buy a Celestron HD wedge for that kind of money. I'm Curious though, with the...
... I am fairly sure, too. Not only will there be a problem when you stack images (where the stacking routine does not care about field rotation). Note that...
The orientation issue Herbert mentioned is a real limitation with the Meade derotator design. I have talked to folks with custom designed derotators and they...
... Well, that's just one more reason not to use a derotator ;) The derotator/wedge issue comes up frequently on other astro groups, and the wedge is pretty...
If this is for a permanent set-up, the wedge can be trivial. It doesn't have to be adjustable, if there is another adjustment point in the pier that allows...
John, Differences of the flat fields may be acceptable with a derotator. In my case (originally 10" LX200, now 11" Celestron) the obvious lack of 'flatness' -...
... Nope. The bolt pattern in the base of the scope is different. -John __________________________________________________ Do You Yahoo!? Tired of spam?...
Thanks, good to know. LN ... From: John Mahony [mailto:jmmahony@...] Sent: Thursday, December 09, 2004 1:19 AM To: Astrometrica@yahoogroups.com Subject:...
I Just recently purchased a NSGPS11. Celestron has a wedge for about $350. I've always had a wedge on my C8, so I'm going to either buy or build one for the...
... Amazing.. I would have never considered this. I actually have a setup now on my pier that would allow this. The pier sits on a 1/2" plate connected as you...
The adjustment is easier than it sounds, especially if the bolts are symmetric wrt the compass directions. And if it's a permanent set-up, you only need to do...
John, can you send me a link where I might learn more about the bolts that are symmetric wrt - compass directions. I ran a Googel search but could not find any...
I responded to your earlier off-list message to me. Didn't you get it? I thought my wording might be too condensed. "wrt" means "with respect to". By...
I have a couple of images of an asteroid field that I took in binned mode last night. I can exactly identify all the stars on the image with those in Guide-8...
Could somebody please explain to me exactly how Astrometrica calculates the magnitudes of any asteroids in a field and also how accurate the magnitudes that ...
This is probably the same problem that crops up with different software and fits keywords and binning. Astrometrica will respond to the fits header binning...
... The short answer to the first part about the question would be: Astrometrica uses aperture photometry. Those who do not need to know it in more detail -...
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