Fwd: [CometObs] Digest Number 3292

Comet Observations Group

2 Messages

Digest #3292

1

71P, C/2015 ER61, C/2015 V2, C/2017 O1 ( PCCP object ASASSN1 ). by "Juan Jose Gonzalez" jjgsgp

2

Comet Observations 24th July 2017 by "Bomber2 Panther" outbackmanyep

Messages

1

71P, C/2015 ER61, C/2015 V2, C/2017 O1 ( PCCP object ASASSN1 ).

Mon Jul 24, 2017 1:45 pm (PDT) . Posted by:

"Juan Jose Gonzalez" jjgsgp

71P/Clark:
2017 July 22.93 UT: m1=9.9, Dia.=2.5', DC=4/, 20 cm SCT (77x).
[ Altitude: 10 deg. Sidgwick method. Tycho-2 comparison stars.
SQM : 20.7.].

C/2015 ER61 (PANSTARRS):
2017 July 23.12 UT: m1=10.0, Dia.=3.5', DC=3/, 20 cm SCT (100x).
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.1.].

C/2015 V2 (Johnson):
2017 July 22.92 UT: m1=7.8, Dia.=8', DC=3, 25x100B.
[ Altitude: 7 deg. Several stars in coma, the brightest
being mag 9.4 (TK). Sidgwick method. Tycho-2 comparison stars.
SQM : 21.0.].

C/2017 O1 (PCCP object ASASSN1):
2017 July 23.13 UT: m1=9.8, Dia.=5', DC=2/, 20 cm SCT (77x).
[ Brighter than expected. Diffuse object with faint outer coma.
Field stars checked in DSS. Altitude: 17 deg. Sidgwick method.
Tycho-2 comparison stars. SQM : 21.0.].

July 22 : from Alto del Trichero - Soto y Amio, Leon, Spain ( Alt. 1190 m, 42º 46' N, 5º 53' W ).

July 23 : from Alto del Castro - Aralla, Leon ( Alt. 1720 m, 42º 54' N, 5º 48' W ).

( Mountain locations, very clear sky ).

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ICQ Format :

71 2017 07 22.93 S 9.9 TK 20.3T10 77 2.5 4/ ICQ XX GON05 2015ER612017 07
23.12 S 10.0 TK 20.3T10 100 3.5 3/ ICQ XX GON05 2015V2 2017 07 22.92 S
7.8 TK 10.0B 25 8 3 ICQ XX GON05 2017O1 2017 07 23.13 S 9.8 TK 20.3T10
77 5 2/ ICQ XX GON05

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J. J. Gonzalez

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2

Comet Observations 24th July 2017

Mon Jul 24, 2017 5:44 pm (PDT) . Posted by:

"Bomber2 Panther" outbackmanyep

Comet Observations 24th July 2017

C/2015 VL62 Lemmon-Yeung-PanSTARRS
2017 Jul 24.73 UT; m1= 14.2; Dia= 0.6'; 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
2017 Jul 24.74 UT; m1= 13.6; Dia= 0.7'; DC= 2; 25cm L, f:5 (x83) [Chris Wyatt, Walcha, NSW, Australia]
Difficult, close to pairing of stars.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ

C/2017 O1 (ASASSN1)
2017 Jul 24.75 UT; m1= 10.0; Dia= 7'; DC= 3; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Coma large, enhances well in Swan Band filter.
Comparison stars checked using Tycho-2 data in Guide 9.0; Method= S; Cat= TK

C/2015 ER61 PanSTARRS
2017 Jul 24.77 UT; m1= 11.2; Dia= 2.8'; DC= 3; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Coma enhances in Swan Band filter.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ

217P/ LINEAR
2017 Jul 24.78 UT; m1= 12.1; Dia= 2.5'; DC= 5/6; 25cm L, f:5 (x39) [Chris Wyatt, Walcha, NSW, Australia]
Coma does not enhance in Swan Band filter, slight interference by zodiacal light.
Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ

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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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