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Digest #3283
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Fri Jun 30, 2017 9:34 pm (PDT) . Posted by:
"Bomber2 Panther" outbackmanyep
Comet Observations 30th June 2017
C/2015 V2 Johnson
2017 Jun 30.60 UT; m1= 7.9; Dia= 12.9'; DC= 3/4; 7x50 B [Chris Wyatt, Walcha, NSW, Australia]
Diffuse coma, a little interference by background stars. Low altitude = 19.8°.
Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK
65P/ Gunn
2017 Jun 30.61 UT; m1= 14.1; Dia= 1'; DC= 2; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Coma diffuse.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ
71P/ Clark
2017 Jun 30.61 UT; m1= 10.3; Dia= 3.1'; DC= 6; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Coma almost disappears in Swan Band filter. Semi-transparent outer coma, gradually brightening to an opaque centre with a small stellar central condensation.
Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ
C/2015 O1 PanSTARRS
2017 Jun 30.62 UT; m1= 14.7; Dia= 0.2'; DC= 5/6; 25cm L, f:5 (x166) [Chris Wyatt, Walcha, NSW, Australia]
Coma very small, just visible near mag 13.3 star.
Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ
41P/ Tuttle – Giacobini - Kresak
2017 Jun 30.63 UT; m1= 11.2; Dia= 4.5'; DC= 3; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Slightly affected by background stars in coma. Coma diffuse, weakly condensed.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ
213P/ Van Ness
2017 Jun 30.64 UT; m1= 13.6; Dia= 0.4'; DC= 3; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Coma small and diffuse. Slight brightening to centre.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ
29P/ Schwassmann – Wachmann 1
2017 Jun 30.65 UT; m1= 12.4; Dia= 1.7'; DC= 3; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Post outburst. Coma weakly condensed and opaque at centre, diffuse outer coma.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ
C/2015 VL62 Lemmon-Yeung-PanSTARRS
2017 Jun 30.66 UT; m1= 14.6; Dia= 0.5'; DC= 2; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Coma small and diffuse.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ
217P/ LINEAR
2017 Jun 30.73 UT; m1= 13.0; Dia= 0.7'; DC= 4/5; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Coma diffuse with moderately condensed centre. Hint of a tail to the WSW. Low altitude = 16.9°.
Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ
C/2015 ER61 PanSTARRS
2017 Jun 30.75 UT; m1= 9.7; Dia= 4.4'; DC= 5; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Faint tail visible, traced to 20' in length in P.A. 253°. Inner coma elongated in tail direction. Combined light from fragment B in coma although fragment B not visible.
Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK
C/2015 V2 Johnson
2017 Jun 30.60 UT; m1= 7.9; Dia= 12.9'; DC= 3/4; 7x50 B [Chris Wyatt, Walcha, NSW, Australia]
Diffuse coma, a little interference by background stars. Low altitude = 19.8°.
Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK
65P/ Gunn
2017 Jun 30.61 UT; m1= 14.1; Dia= 1'; DC= 2; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Coma diffuse.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ
71P/ Clark
2017 Jun 30.61 UT; m1= 10.3; Dia= 3.1'; DC= 6; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Coma almost disappears in Swan Band filter. Semi-transparent outer coma, gradually brightening to an opaque centre with a small stellar central condensation.
Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ
C/2015 O1 PanSTARRS
2017 Jun 30.62 UT; m1= 14.7; Dia= 0.2'; DC= 5/6; 25cm L, f:5 (x166) [Chris Wyatt, Walcha, NSW, Australia]
Coma very small, just visible near mag 13.3 star.
Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ
41P/ Tuttle – Giacobini - Kresak
2017 Jun 30.63 UT; m1= 11.2; Dia= 4.5'; DC= 3; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Slightly affected by background stars in coma. Coma diffuse, weakly condensed.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ
213P/ Van Ness
2017 Jun 30.64 UT; m1= 13.6; Dia= 0.4'; DC= 3; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Coma small and diffuse. Slight brightening to centre.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ
29P/ Schwassmann – Wachmann 1
2017 Jun 30.65 UT; m1= 12.4; Dia= 1.7'; DC= 3; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Post outburst. Coma weakly condensed and opaque at centre, diffuse outer coma.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ
C/2015 VL62 Lemmon-Yeung-PanSTARRS
2017 Jun 30.66 UT; m1= 14.6; Dia= 0.5'; DC= 2; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Coma small and diffuse.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ
217P/ LINEAR
2017 Jun 30.73 UT; m1= 13.0; Dia= 0.7'; DC= 4/5; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Coma diffuse with moderately condensed centre. Hint of a tail to the WSW. Low altitude = 16.9°.
Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ
C/2015 ER61 PanSTARRS
2017 Jun 30.75 UT; m1= 9.7; Dia= 4.4'; DC= 5; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Faint tail visible, traced to 20' in length in P.A. 253°. Inner coma elongated in tail direction. Combined light from fragment B in coma although fragment B not visible.
Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK
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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