Fwd: [CometObs] Digest Number 3355

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Digest #3355

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Comet Observations 7th December 2017 by "Bomber2 Panther" outbackmanyep

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Observations Nov 28 - Dec 07 by "Thomas Lehmann" ewelot

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1

Comet Observations 7th December 2017

Fri Dec 8, 2017 12:57 am (PST) . Posted by:

"Bomber2 Panther" outbackmanyep

Comet Observations 7th December 2017

C/2015 V2 Johnson
2017 Dec 07.43 UT; m1= 13.5; Dia= 1.1'; DC= 5/6; 25cm L, f:5 (x166) [Chris Wyatt, Walcha, NSW, Australia]
Coma diffuse, with faint stellar central condensation in periods of good seeing.
Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ

C/2017 K6 Jacques
2017 Dec 07.44 UT; m1= 14.2; Dia= 0.9'; DC= 3; 25cm L, f:5 (x166) [Chris Wyatt, Walcha, NSW, Australia]
Coma very diffuse. Sometimes faintly stellar in periods of good seeing.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ

C/2016 R2 PanSTARRS
2017 Dec 07.45 UT; m1= 11.2; Dia= 2'; DC= 3; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Does not enhance in Swan Band filter. Coma appears elongated to the West approximately.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ

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Observations Nov 28 - Dec 07

Fri Dec 8, 2017 2:13 pm (PST) . Posted by:

"Thomas Lehmann" ewelot

Please find enclosed a list of my recent comet observations in ICQ format.
Magnitudes are derived from large aperture photometry of CCD/DSLR images
(using green filter or green color channel) and are supposed to conform
to visual estimates of total coma magnitudes.

Remote observations were carried out using telescopes from iTelescope.net.
For image reduction and photometric analysis I used my AIRTOOLS software
(see https://github.com/ewelot/airtools).

Thomas Lehmann
Weimar, Germany

2016R2 2017 11 28.38 C 11.0 AQ 10.6R 5a480 11 0.25 219 LEHaa 18.5 CCD/G remote (Mayhill), plasma tail 0.20 deg at pa=309

2017O1 2017 12 07.74 C 10.5 AQ 07.5A 4D154 17 LEHaa 18.5 DSLR green

24 2017 12 04.52 C 11.2 AQ 10.6R 5a480 7 LEHaa 17.4 CCD/G remote (Mayhill), moon 99% dist 113deg

62 2017 12 04.51 C 10.9 AQ 10.6R 5a360 7 LEHaa 17.2 CCD/G remote (Mayhill), moon 99% dist 93deg
62 2017 12 05.73 C 10.8 AQ 10.6R 5a360 10 LEHaa 17.8 CCD/G remote (SSO), moon 94% dist 76deg

71 2017 12 04.43 C 14.8 AQ 40.0L 4a600 2.1 LEHaa 19.0 CCD/G remote (SSO), moon 99% dist 122deg

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Colin James Watling

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Various Voluntary work-Litter Picking for Parish Council (Daytime) and also a friend of Kessingland Beach (Watchman)

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Real Astronomer and head of the Comet section for LYRA (Lowestoft and Great Yarmouth Regional Astronomers) also head of K.A.G (Kessingland Astronomy Group) and Navigator (Astrogator) of the Stars (Fieldwork)

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