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Posts Made By: Larry Citro

March 15, 2003 02:23 PM Forum: Equipment Talk

Mounting curiosity

Posted By Larry Citro
hi,

I have the MI 250 and it's a great mount.. I used it for ccd imaging with about 50 lbs on it without any problems.

The EM200 Temma (goto) is also very good ... it's lighter and more portable and can carry about 35 lbs for imaging.

don't know about the Titan aor CGE.





clear skies,


Larry Citro

March 28, 2003 06:02 PM Forum: Equipment Talk

How much light is twice as much?

Posted By Larry Citro
hi,

i believe a 1st mag star is perceived twice a bright as a 2ed mag star and if so a 6" scope will just about double the percieved brightness of a 4" scope.

Larry Citro

March 29, 2003 02:47 AM Forum: CCD Imaging and Processing/Solar System

NGC2521

Posted By Larry Citro
hi,

yes that is a very pretty galaxy. I stumbled on it last year while crusing in the dipper, lynx ect. It looked bright in my 121/2 " dob so I later took a ccd "snapshot of it to see what it looked like. I agree it looks very much like a the sunflower.

A very nice image of a relatively unknown galaxy.


clear skies,



March 30, 2003 11:16 AM Forum: CCD Imaging and Processing/Solar System

Jupiter animation Mar 28

Posted By Larry Citro
hi,

very nice animtation. I've never seen this visually so it was a real treat to see your animation of the moon moving across and then off of the planets disk.

clear skies,

Larry Citro

March 31, 2003 02:41 AM Forum: CCD Imaging and Processing/Solar System

NGC3521 - finally some better color

Posted By Larry Citro
hi,

Now that shot does justice to this galaxy...really nice. I know we all look with a jaded eye at our own work , but no need to be critical of oneself here.

clear skies,

Larry Citro

March 31, 2003 04:02 PM Forum: CCD Imaging and Processing/Solar System

NGC4244 color

Posted By Larry Citro
hi Ron,

you know I always thought edge on galaxies were much the same in appearance and a bit uninteresting ... but you are proving me wrong. The dust lanes near the center and the star clouds farther out in the arms give this one a lot of character...very nicely done as usual


clear skies,


Larry Citro

April 2, 2003 07:23 AM Forum: CCD Imaging and Processing/Solar System

A dim galactic bulb: NGC 3319

Posted By Larry Citro
hi Ron,

According to Uranometria it's listed as 6.9 x 4.0 arcmin size total mag 11.1 with a surface brightness of 14.5 ( m66 has a surfaace brightness of 12.5 for comparison). The type is listed as SB(rs)cd II-III ... barred spiral with inner ring S shaped moderately open rings.

Yes it is dim ...about a 5 watt bulb. But what your are showing is pretty darn good .. a testimony to those dark New Mexico skies.


clear skies,

Larry Citro

April 2, 2003 07:31 AM Forum: CCD Imaging and Processing/Solar System

m3 lrgb

Posted By Larry Citro
hi,

Thanks for the comments. Sometimes I need a break from those looooong imaging sessions with galaxies and thats when I turn to the globulars. M3 has always been one of my favorites ... a globular interloper in the realm of galaxies.


clear skies,


Larry Citro

April 2, 2003 12:28 PM Forum: CCD Imaging and Processing/Solar System

M96 M96 M105 group in Leo

Posted By Larry Citro
hi,

Very nice image .. I had no idea a digital cam could produce such impressive results. Also, I looked at your website and took the tour...and enjoyed that also. Very nice !!

clear skies,

Larry Citro

April 4, 2003 12:04 AM Forum: CCD Imaging and Processing/Solar System

AP 1200 mount 88min image unguided, round stars

Posted By Larry Citro
hi,

That's remarlabe at that FL...I guess your mount is a keeper smile.

From what you describe in your narritive I would guess the very accurate polar alingnment was key resulting in no declination drift ( even very small amounts of drift would be seeable at that FL ) along with a very good pec correction. The best PE of any mount I've heard of is 2 arc sec for a Paramount and even that would show at a scale of .66arcsec/pixel, so your pec must have taken care of that.

That image is a great result ! I know from personal experience how difficult it is to image at the scale ( a Tak Mewlon 250 at f12 with a ST8-E is about the same scale ) and I can only do it with autoguiding and good seeing so the guider won't chase the seeing.

clear skies,

Larry Citro

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