Fwd: [CometObs] Digest Number 3626

Comet Observations Group

2 Messages

Digest #3626

1

C/2017 T2, C/2018 N2, C/2018 W2, 68P, 260P - 28 + 29 Sep. 2019. by "jjgonzalez jjgonzalez" jjgsgp

2.1

File - cometobs_policies.txt by

Messages

1

C/2017 T2, C/2018 N2, C/2018 W2, 68P, 260P - 28 + 29 Sep. 2019.

Mon Sep 30, 2019 6:37 am (PDT) . Posted by:

"jjgonzalez jjgonzalez" jjgsgp

C/2017 T2 (PANSTARRS):
2019 Sep. 29.06 UT: m1=9.5, Dia.=6', DC=2, 20 cm SCT (100x).
[ Diffuse outer coma diameter 6', providing m=9.5.
Brighter inner coma diameter 2', providing m=11.1.
Sidgwick method. Tycho-2 comparison stars. SQM: 21.1.].

C/2018 N2 (ASASSN):
2019 Sep. 29.02 UT: m1=10.8, Dia.=3', DC=4, 20 cm SCT (77x).
[ Sidgwick method. Tycho-2 comparison stars. SQM: 21.4.].

C/2018 W2 (Africano):
2019 Sep. 28.96 UT: m1=8.1, Dia.=6', DC=5, 10x50B.
[ In 25x100B: m1=8.3, Dia.=7', DC=5, Tail 0.3 deg. in PA 20 deg.
In 20 cm SCT (77x): m1=8.6, Dia.=6', DC=3/, Tail 0.2 deg.
Sidgwick method. Tycho-2 comparison stars. SQM: 21.4.].

68P/Klemola:
2019 Sep. 28.84 UT: m1=10.6, Dia.=3', DC=3, 20 cm SCT (100x).
[ Brighter inner coma diameter 3', providing m=10.6.
Faint and diffuse outer coma diameter 7', providing m=9.5.
Sidgwick method. Tycho-2 comparison stars. SQM: 21.0.].

260P/McNaught:
2019 Sep. 29.04 UT: m1=11.2, Dia.=2', DC=4, 20 cm SCT (100x).
[ Sidgwick method. Tycho-2 comparison stars. SQM: 21.3.].

( Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m;
SQM 21.4 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)