UwePilz
Aktives Mitglied
Jeff Schröder beschrieb in der News-Gruppe sci.astro.amateur eine Helligkeitsanstieg um etwa zwei Größenklassen. Damit sollte der Komet kurz ab 23h30 von normalen deutschen Standorten aus sichtbar sein. Alle, welche vorher beobachtet oder fotografiert haben, werden den Unterschied sehen. Ich freue mich auf heute Nacht und ziehe raus, falls sich das Wetter hält!
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sci.astro.amateur
Datum: Mon, 04 Jul 2005 08:59:37 GMT
Lokal: Mo 4 Jul. 2005 10:59
Betreff: Deep Impact / Tempel 1 Observation
From Ford observatory in Wrightwood, California. We had a successful view of
the aftermath of the collision with our 18.5" f/7 newtonian under 5.0
magnitude skies. The comet was NOT seen before the collision by two
observers using magnifications from 70x to 350x. The sky was perfectly
clear, but we had considerable interference from L.A. cityglow to the
southwest. Two minutes after the predicted impact time, I saw a faint
unstructured spot appear that was about 10 to 15 arc/sec wide. Ten minutes
later, a starlike nucleus could be seen with averted vision at the spot's
center. After another ten minutes, several of us could see the central point
easily with direct vision. The debris cloud brightened a little more by the
end of one hour post impact. Except for the central point, no structure was
seen in the cloud and it appeared symmetric. Assuming that the comet was
just below detection before the impact, I would (roughly) estimate that it
brightened by 2 magnitudes in the first hour that we observed it. After
that, we didn't see any further brightness increase, but it was getting
lower and extinction and brighter light pollution were taking their toll. We
stopped observing just after midnight.
Even though this was about as faint & fuzzy as you can get, seeing it appear
from nowhere as predicted was a real thrill! There was a lot of excitment in
the dome, and a night to be remembered by all.
Jeff Schroeder
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sci.astro.amateur
Datum: Mon, 04 Jul 2005 08:59:37 GMT
Lokal: Mo 4 Jul. 2005 10:59
Betreff: Deep Impact / Tempel 1 Observation
From Ford observatory in Wrightwood, California. We had a successful view of
the aftermath of the collision with our 18.5" f/7 newtonian under 5.0
magnitude skies. The comet was NOT seen before the collision by two
observers using magnifications from 70x to 350x. The sky was perfectly
clear, but we had considerable interference from L.A. cityglow to the
southwest. Two minutes after the predicted impact time, I saw a faint
unstructured spot appear that was about 10 to 15 arc/sec wide. Ten minutes
later, a starlike nucleus could be seen with averted vision at the spot's
center. After another ten minutes, several of us could see the central point
easily with direct vision. The debris cloud brightened a little more by the
end of one hour post impact. Except for the central point, no structure was
seen in the cloud and it appeared symmetric. Assuming that the comet was
just below detection before the impact, I would (roughly) estimate that it
brightened by 2 magnitudes in the first hour that we observed it. After
that, we didn't see any further brightness increase, but it was getting
lower and extinction and brighter light pollution were taking their toll. We
stopped observing just after midnight.
Even though this was about as faint & fuzzy as you can get, seeing it appear
from nowhere as predicted was a real thrill! There was a lot of excitment in
the dome, and a night to be remembered by all.
Jeff Schroeder
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