13 June 2004

21 December 2003

Observing
Location
Boardwalk at Beach 83 St in the Rockaways
Atmospheric
Conditions
It was cold, probably in the 20s. There wasn't much wind. The air was clear and there wasn't much in the way of clouds in the area of the moon.
Observing
Instruments
Canon 15x50 Image Stabilized binoculars - Charlie
Dobsonian - Markus
Observing
Party
Charlie Ridgway
Markus Finkemeier

TargetDschubba, δ Scorpii
Time21Dec03; 06:10 EST
Category grazing occultation
CommentsThis is the most impressive astronomical event I have observed to date.
Dschubba is a magnitude 2.34 star in the center of the head of Scorpius. Its Arabic name is Al-Jabhah, meaning "The Forehead." It was easily visible near the dark limb of the waning, 27 day 10 hour moon. As it rose in the early morning sky the moon appeared as a thin crescent, being only 5.9% illuminated. When we first arrived it looked like the event would be an occultation but as the time grew close the star moved up to the Moon's limb and appeared to be pushed along by it before it disappeared at around the 4:00 position. It flashed back into view four to six times before reappearing and moving away from the Moon at about the 2:30 position. I was recording the event on my MP3 player but when it was all over nothing was there. I also noticed a time discrepancy of over five minutes between my GPS receiver and my Palm PDA. The PDA had the correct time.

Disclaimer
This is my personal record of my astronomical observations. It was written for my personal reference. The only reason it is in a blog is that a blog is a very convenient way to get the records formatted more or less uniformly and they will, hopefully, have greater longevity at Google where the servers are backed up than on my hard drive which never gets backed up. I occasionally include copyrighted material in my posts. I do this to make it convenient for me to access things I think I might want to refer to again. I think of this like making a photocopy of something I read that I put in a file where I can find it when I want it. As I understand copyright law, as explained in the DVD series Copyright Compliance by Chip Taylor Communications, this use is allowed under the Fair Use doctrine since I am not making any money on this blog, I don’t publicize the blog, and only occasionally post small excerpts of copyrighted works.


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