STARGAZING SESSION IN CALIRAYA , LAGUNA |
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April 9-10, 2005 by Jett Aguilar |
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Our April Caliraya trip was really a resounding success and might be the best session for the year both in the number of participants and of objects viewed and imaged. We arrived at the Caliraya Hilltop resort welcomed by a fantastic mountain view of a beautiful summer sunset. After a short but hearty (high cholesterol ;-)) dinner, the group didn't waste time setting up their equipment at the bridge. I was looking forward to seeing Mon's new "big gun" setup the colossal Atlas mount carrying his 10 inch Newtonian. His setup was really impressive and I couldn't help looking at the huge improvised bar-bell counterweights. It seems that Mon had transported a whole mini-observatory to the resort. Tracking seems to be working very well when I
After the Sombrero, I decided to image the fabulous After Omega Centauri I then attached my camera piggy-back to my SCT and took a widefield image of the smallest constellation Crux ("Southern cross") as it was disappearing thru the leaves of a palm tree in the South. Looking closely at the image I seem to discern the faint outline of the "coalsack" at the lower left corner of the cross but it might just be my imagination. Anyway, I plan to look for it again next month. After imaging Omega Centauri, Jun Lao suggested viewing or My next target was M 83, the Southern Pinwheel galaxy in Centaurus. This time my mount's tracking seemed to have improved somewhat and I was able to obtain more 2-minute images with round stars compared to my attempt on the Sombrero galaxy. I was able to stack 13 images to obtain a good image of a greenish M83 showing its spiral arms. M83 is classified as intermediate between a spiral and a barred spiral galaxy and my image was able to show this
At about this time I looked up in the sky and noticed that the Milky Way was prominent in the Southern horizon appearing as a long hazy cloud. I decided to take the opportunity to do wide field imaging of the Milky Way for the first time with my digital camera piggy-backed on my SCT. I again took 2-minute images with tracking and included a dark frame image at the end. I had to wipe the front of my camera lens after every shot since it gets covered with dew every 2 minutes. Visually the Milky Way looks a little boring but it was spectacular in the digital images. For the first time I was able to really appreciate looking at the "center' of our galaxy and to understand the relationships of the constellations and deep sky objects in this very rich portion of the sky. I even remembered overhearing Jun Lao talking to the group about looking near the tail of Scorpius for 2 prominent star clusters (M6, the Butterfly cluster and M7, the Ptolemy cluster) but I didn't look since I was busy imaging. However, when I reviewed my image at home, I clearly saw the two clusters just west of Scorpius' tail! Another thing I noticed when looking at my images is the lack of hydrogen-alpha (red) sensitivity of the Canon EOS 300D - with the prominent nebulosity of M 8 (Lagoon nebula) losing much of its reddish color. There are web sites describing in detail how to modify the Canon rebel to improve H-alpha sensitivity but I think that it is too much trouble and I really wouldn't want to risk damaging an expensive camera. After imaging the Milky Way, I wiped my corrector plate with a lens cloth and tried imaging the Ring nebula in Lyra again. However, tracking was still bad and the dew came back on my corrector plate with vengeance. I had no choice but to abandon further imaging which is just as well since it was almost twilight anyway at that time. Despite the tracking and dewing problems, I still consider the April 9-10 Caliraya trip as one of the most successful and enjoyable ALP stargazing parties that I have joined. The excellent companionship and camaraderie, the pristine dark skies, and the beautiful summer astronomical objects all combined to produce a perfect memorable session. I can't wait for the next one this May! |
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For Comments jkty@astroleaguephils.org |
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