I was able to to achieve 3 minutes of perfect alignment the other night! Jupiter stayed perfectly centered in the circle of my special alignment eyepiece, with no visible drift until shortly after 3 minutes. The longest exposure time so far that my friend Dave and I have attempted is about 40 seconds, so 3 mins would have produced some fairly decent results. Unfortunately Dave was not here(camera boy), so I was unable to do so.
What made this latest attempt more successful I believe was that after performing the drift alignment to the south(azimuth adjustment to the mouth) and then to the east(altitude adjustment to the mount), I repeated the south drift alignment again. I have read that after performing the second step, it throws the first step off a little. That seems perfectly logical to me because you are changing the location of the polar axis on your mount by adjusting either the azimuth or altitude.
This blog is simply a journal for my observations of the night sky. I hope to look back on it in the future for reference. And maybe a newbie to astronomy will learn from my experiences. If you have any questions or just want to chat, email me at mbanta@bantacomputers.com. Please sign-up!
Sunday, November 14, 2010
Sunday, October 31, 2010
New Meade 12mm Illuminated Reticle
I just purchased this new Meade eyepiece with double cross-hairs for drift alignment imprinted on the reticule. It has several other lines and graphs but I will deal with those later.
I setup last night in my backyard, first performing a polar alignment using my mounts polarscope. I use to think using the polarscope alone with sufficient for astro-photography. Over 2 whole wasted nights of streaked pictures, I learned this was not so. Using just a polarscope for general observing is ok, but not for pictures! I did not have much luck using the drift alignment method last night. I started by looking for a decently bright star at my southern horizon. Because of trees and my house I have a limited area to pull off a polar alignment using the NCP and getting a decent look to my south because of the house. I was able to find a few faint stars to try with the new eyepiece somewhere around the celestial equator and the southern meridian. So with the RA tracking motor turned off, I let the star drift through the eyepiece and adjusted the eyepiece so that the star ran parallel between the cross-hair. It didn't take long, maybe 2-3 minutes, to see the star drift off to one side. I made an adjustment to my azimuth(can't remember which direction), and tried again. I tried a few more times with no real big success. It got rather late so I gave up after about an hour. All is not lost though and spirits are still high because I came away with some real experience in drift alignment.
I don't mind cloudy nights as much right now because with even a few breaks in the clouds I am able to practice aligning the mount and scope!
I setup last night in my backyard, first performing a polar alignment using my mounts polarscope. I use to think using the polarscope alone with sufficient for astro-photography. Over 2 whole wasted nights of streaked pictures, I learned this was not so. Using just a polarscope for general observing is ok, but not for pictures! I did not have much luck using the drift alignment method last night. I started by looking for a decently bright star at my southern horizon. Because of trees and my house I have a limited area to pull off a polar alignment using the NCP and getting a decent look to my south because of the house. I was able to find a few faint stars to try with the new eyepiece somewhere around the celestial equator and the southern meridian. So with the RA tracking motor turned off, I let the star drift through the eyepiece and adjusted the eyepiece so that the star ran parallel between the cross-hair. It didn't take long, maybe 2-3 minutes, to see the star drift off to one side. I made an adjustment to my azimuth(can't remember which direction), and tried again. I tried a few more times with no real big success. It got rather late so I gave up after about an hour. All is not lost though and spirits are still high because I came away with some real experience in drift alignment.
I don't mind cloudy nights as much right now because with even a few breaks in the clouds I am able to practice aligning the mount and scope!
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