1st October 2011 ngc6781 in Aquila A great deal smaller and dimmer
than M27! 7x10 minutes taken through hazy clouds
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M101
supernova magnitude 11.055
I have managed to get readings for
seven nights in a row. Most unusual weather
conditions!
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12th OctoberA brief gap in the clouds so I tried a quick
shot of M101. Unfortunately the warm temperature today with rain in the
afternoon has caused condensation somewhere in the equipment! However, I
could still get a magnitude reading for the supernova (arrowed) from this
image.
The appearance of Vega when the dreaded condensation
strikes...
How Vega should look...
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Magnitude 11.793
As the brightness
declines, my values are drifting below the AAVSO readings which use a V
filter.
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15
October
Very bright Moon. Supernova magnitude
11.969
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18th October
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The M51
supernova is now getting quite dim.
My previous magnitude estimates were
very different from the AAVSO values, so I refined my technique.
I
altered the aperture, gap width and annulus width so as to more neatly target
the stars. Previously I had left them at the default settings.
The
result is impressive and my points now follow the general
consensus.
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I used the same refinement on the M101 supernova images but do not get such good
agreement.
As the brightbness decreases there seems to be more of a
departure from the AAVSO
values.
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19th October A
break from supernovae. This is the start of work on the Veil Nebula, ngc6960. 7x10 minutes
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