2 Messages
Digest #3264
Messages
Thu May 25, 2017 3:35 am (PDT) . Posted by:
"Bomber2 Panther" outbackmanyep
Comet Observations 24th May 2017
C/2015 V2 Johnson
2017 May 24.41 UT; m1= 8.3; Dia= 4.3'; DC= 5/6; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Dust tail visible 10' in length in P.A. 337° approximately. Low altitude = 16.6°. Transparent outer coma, opaque inner coma, small bright central condensation appears stellar sometimes. Inner coma does not enhance in Swan Band filter.
Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK
2017 May 24.42 UT; m1= 7.8: ; Dia= 12'; DC= 4; 7x50 B [Chris Wyatt, Walcha, NSW, Australia]
Coma diffuse, 8th magnitude background star in coma visible which interfered with observation. Slight hint of tail to the NW approximately. Low altitude = 18.4°. Easy to locate in a dark sky.
Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK
71P/ Clark
2017 May 24.43 UT; m1= 12.5; Dia= 0.8'; DC= 6; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Does not enhance in Swan Band filter; Outer coma opaque brightening to an opaque inner coma and stellar central condensation. Slight hint of coma elongation to the NW approximately.
Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ
C/2015 V2 Johnson
2017 May 24.41 UT; m1= 8.3; Dia= 4.3'; DC= 5/6; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Dust tail visible 10' in length in P.A. 337° approximately. Low altitude = 16.6°. Transparent outer coma, opaque inner coma, small bright central condensation appears stellar sometimes. Inner coma does not enhance in Swan Band filter.
Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK
2017 May 24.42 UT; m1= 7.8: ; Dia= 12'; DC= 4; 7x50 B [Chris Wyatt, Walcha, NSW, Australia]
Coma diffuse, 8th magnitude background star in coma visible which interfered with observation. Slight hint of tail to the NW approximately. Low altitude = 18.4°. Easy to locate in a dark sky.
Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK
71P/ Clark
2017 May 24.43 UT; m1= 12.5; Dia= 0.8'; DC= 6; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Does not enhance in Swan Band filter; Outer coma opaque brightening to an opaque inner coma and stellar central condensation. Slight hint of coma elongation to the NW approximately.
Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ
Thu May 25, 2017 1:19 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/
Thomas Lehmann
Weimar, Germany
2015V2 2017 05 21.41 C 7.3 TK 10.6R 5a720 40 0.8 319 LEHaa 18.7 CCD/G remote (Mayhill), plasma tail 1.1 deg at pa=171, moon 26% dist 128deg
2015V2 2017 05 22.91 C 7.5 TK 07.5A 4B880 32 0.7 319 LEHaa 18.4 DSLR green, plasma tail 1.1 deg at pa=169
41 2017 05 18.28 C 8.1 TK 10.6R 5a600 32 LEHaa 18.7 CCD/G remote (Mayhill)
41 2017 05 22.99 C 8.2 TK 07.5A 4E280 32 LEHaa 18.8 DSLR green
71 2017 05 22.59 C 10.7 AQ 40.0L 4a360 10 0.23 288 LEHaa 19.9 CCD/G remote (SSO)
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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