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Saturday, 24 June 2017

Fwd: [CometObs] Digest Number 3277

2 Messages

Digest #3277
1
Comet Observations 22nd June 2017 by "Bomber2 Panther" outbackmanyep
2
Observations Jun 16 - Jun 22 by "Thomas Lehmann" ewelot

Messages

Thu Jun 22, 2017 11:44 pm (PDT) . Posted by:

"Bomber2 Panther" outbackmanyep

Comet Observations 22nd June 2017

C/2015 V2 Johnson
2017 Jun 22.46 UT; m1= 7.7; Dia= 13'; DC= 3; 7x50 B [Chris Wyatt, Walcha, NSW, Australia]
Coma diffuse, slight brightening to centre.
Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK

65P/ Gunn
2017 Jun 22.47 UT; m1= 13.9; Dia= 0.8'; DC= 2; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Very diffuse.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ

71P/ Clark
2017 Jun 22.48 UT; m1= 10.4; Dia= 3.1'; DC= 5/6; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Inner coma opaque, sometimes stellar at centre, outer coma fanned to the NW approximately. Centre enhances slightly in Swan Band filter.
Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ

41P/ Tuttle – Giacobini - Kresak
2017 Jun 22.74 UT; m1= 11.1; Dia= 3.5'; DC= 2/3; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Close to star.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ

29P/ Schwassmann – Wachmann 1
2017 Jun 22.75 UT; m1= 13.5; Dia= 1'; DC= 2; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Diffuse patch of light, slightly brighter in centre.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ

217P/ LINEAR
2017 Jun 22.75 UT; m1= 13.3; Dia= 0.8'; DC= 5/6; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Coma diffuse, opaque with small central condensation, almost stellar. Slightly elongated to the South-East approximately.
Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ

C/2015 ER61 PanSTARRS
2017 Jun 22.76 UT; m1= 9.3; Dia= 4.1'; DC= 5; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Faint tail visible, 10.5' in length in P.A. 260°; Coma dims slightly in Swan Band filter. Inner coma appears elongated to the South-West approximately, Fragment B just noticeable as a diffuse smudge behind the central condensation in the coma. Magnitude refers to total combined light of the pair.
Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK

Fri Jun 23, 2017 1:37 pm (PDT) . 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

2015ER612017 06 22.43 C 9.2 TK 10.6R 5a600 15 0.9 258 LEHaa 17.7 CCD/G remote (Mayhill)

2015V2 2017 06 18.92 C 7.7 TK 07.5A 4B558 28 0.8 346 LEHaa 19.4 DSLR green, plasma tail 0.6 deg at pa=127

2016M1 2017 06 17.33 C 15.6 TK 10.6R 5a960 1.2 LEHaa 19.3 CCD/G remote (Mayhill), moon 52% dist 88deg

2 2017 06 19.68 C 13.2 AQ 40.0L 4a600 7 LEHaa 18.8 CCD/G remote (SSO), moon 27% dist 53deg

41 2017 06 16.27 C 9.6 TK 10.6R 5a720 20 LEHaa 18.8 CCD/G remote (Mayhill)
41 2017 06 21.65 C 10.4 TK 10.6R 5a720 14 LEHaa 17.9 CCD/G remote (SSO)

71 2017 06 21.49 C 9.2 TK 10.6R 5a600 21 LEHaa 19.0 CCD/G remote (SSO)




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Good Clear Skies
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Astrocomet
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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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Lyra Main Website: http://www.lyra-astro.co.uk/

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