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Two Comets by Denis Buczynski

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Denis Buczynski
Time of observation
09/10/2012 - 11:19
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These two images of comets 260p McNaught and 168p Hergenrother were taken by Denis on the nights of 4th and 5th October in bright moonlight using his "secondary telescope" which is now coming into more regular use. 168p Hergenrother is in outburst.
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C/2012 K5 Linear

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Time of observation
08/10/2012 - 10:52
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260P McNaught

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Time of observation
08/10/2012 - 10:49
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168P Herrgenrother

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Time of observation
08/10/2012 - 10:47
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I was able to obtain an image of C168P Hergenrother last night. I had problems with passing cloud. And the total exposure time is just 10 minutes. My imaging equipment as follows. T: C9.25 working at F6.3 M: Losmandy G11 C: Canon 1000D modified G: QHY5 through 50mm finder, guided on the comet, using PHD Paul A Brierley. Observing Co-ordinator Macclesfield Astronomical Society
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168P Hergenrother

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Time of observation
08/10/2012 - 10:45
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BAA Articles

2012 September 21 Earth-grazing fireball

Our analysis of the fireball continues. In the light of current speculation we provide the following information based on our early results.

Currently, our first pair of images of the object are from southern Norway when the fireball was high over the North Sea. We have used an accurately timed shutter gap to determine that the velocity at this point was 12.0 km/s and the height was around 60km descending. This velocity is in excess of Earth’s escape velocity and so rules out a man-made satellite re-entry. Therefore, it is most probable that this object was natural and that atmospheric entry was well to the east of our first images.

In this regard we would be very interested to hear from observers in Denmark, north-eastern Germany, southern Sweden and northern Poland who witnessed the fireball at 23:55 CEST on Friday 21 September.  Please contact us at meteor@britastro.org.

We have used the known exposure duration of an image from the west coast of Ireland to estimate the velocity of the two brightest components as they moved out over the Atlantic. We get velocities of 7.8 and 8.5 km/s and a height of 62 km ascending. These velocities and the track orientation and position are not at all consistent with ongoing speculation that there is a connection between this fireball and a fireball seen in south-eastern Canada/north-eastern USA 155 minutes later.

Further information will be posted as it becomes available.

John Mason & Nick James.

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C/2012 a2 Linear

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Time of observation
07/10/2012 - 15:28
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C/2012 K5 Linear

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Time of observation
07/10/2012 - 15:26
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C/2012 J1 Catalina

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Time of observation
07/10/2012 - 15:24
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260P McNaught

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Time of observation
07/10/2012 - 15:21
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