Fwd: [CometObs] Digest Number 3619

Comet Observations Group

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Digest #3619

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C/2017 T2, C/2018 N2, C/2018 W2, 68P, 260P - 3 + 4 Sep. 2019 - J J G by "jjgonzalez jjgonzalez" jjgsgp          

C/2017 T2, C/2018 N2, C/2018 W2, 68P, 260P - 3 + 4 Sep. 2019 - J J G

Fri Sep 6, 2019 4:22 am (PDT) . Posted by:

"jjgonzalez jjgonzalez" jjgsgp

C/2017 T2 (PANSTARRS):
2019 Sep. 4.17 UT: m1=9.6, Dia.=6', DC=2, 20 cm SCT (77x).
[ Diffuse outer coma appears smaller and fainter than
in previous observation: diameter 6', providing m=9.6 at 77x.
Brighter inner coma diameter 2', providing m=11.3 at 133x.
Zodiacal light. Nearby field stars checked in DSS.
Sidgwick method. Tycho-2 comparison stars. SQM: 21.2.].

C/2018 N2 (ASASSN):
2019 Sep. 4.02 UT: m1=11.7, Dia.=1.5', DC=5, 20 cm SCT (100x).
[ Sidgwick method. Tycho-2 comparison stars. SQM: 21.5.].

C/2018 W2 (Africano):
2019 Sep. 4.10 UT: m1=9.8, Dia.=6', DC=2/, 20 cm SCT (77x).
[ Sidgwick method. Tycho-2 comparison stars. SQM: 21.4.].

68P/Klemola:
2019 Sep. 3.95 UT: m1=10.8, Dia.=3', DC=3, 20 cm SCT (100x).
[ Brighter inner coma diameter 3', providing m=10.8.
Faint and diffuse outer coma diameter 8', providing m=9.7.
Altitude: 19°. Sidgwick method. Tycho-2 comparison stars.
SQM: 21.0.].

260P/McNaught:
2019 Sep. 4.07 UT: m1=11.6, Dia.=1.5', DC=4, 20 cm SCT (133x).
[ Sidgwick method. APASS comparison stars. SQM: 21.5.].

( Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m;
SQM 21.5 at zenith ).

J. J. Gonzalez Suarez

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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 K.A.G (Kessingland Astronomy Group) and Navigator (Astrogator) of the Stars (Fieldwork)