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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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ccd image and observation
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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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168P Hergenrother

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Time of observation
07/10/2012 - 15:20
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BAA Articles

Comet 168P Hergenrother in outburst

BAA member Denis Buczynski reports:

This comet (with period of 6.9 years) first discovered by Carl Hergenrother at Catalina in 1998 is now at perihelion and has undergone an outburst which makes it currently the brightest comet in Northern skies. It is well situated for study all night located in Pegasus with an altutude of more than 50 degrees and due south at midnight. The predicted magnitude at this time was around 15 but recent estimates have shown the comet to be more than 5 magnitudes brighter than that at around 9-10. This means that visual sightings including binocular observations are possible and DSLR photography will show the comet easily. CCD images show a bright elongated coma and a short broad southward pointing tail. This curent outburst coincides with the waning moon becoming less prominent and the next dark moon period beckoning. The Comet Section invites all observations(visual estimates and descriptions, drawings and images) to be submitted to cometobs@britastro.org.

There are some images of this comet available for viewing on the Comet Gallery at the BAA Website.

A recent quote from the discoverer on Yahoo groups comet-ml on 2012 OCT 3

“I’d like to thank everyone who has been observing “my” comet during this outburst-filled apparition.

Last night I was able to spot the comet in my 30×125s and 12″ dob. The comet was around 9.8-9.9, highly condensed with a short tail to the south.

- Carl Hergenrother”

An image taken on Oct 5 by myself is here:

Comet 168P on 2012 10 05 by Denis Buczynski

A colour image taken on Oct 3 by Micheal Jager is here:

Comet 168P on 2012 10 03 by Micheal Jager

Skyhound.com has generated this Finder Chart.

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C/2012 K5 Linear

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Time of observation
05/10/2012 - 21:09
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