Fwd: [CometObs] Digest Number 3542

Comet Observations Group

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Digest #3542

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29P, 38P, 46P, 64P, C/2016 R2, C/2018 L2, C/2018 N2, C/2018 Y1. by "Juan Jose Gonzalez" jjgsgp

Message

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29P, 38P, 46P, 64P, C/2016 R2, C/2018 L2, C/2018 N2, C/2018 Y1.

Thu Jan 3, 2019 9:09 am (PST) . Posted by:

"Juan Jose Gonzalez" jjgsgp

29P/Schwassmann-Wachmann:
2019 Jan. 1.81 UT: m1=10.1, Dia.=7', DC=1, 20 cm SCT (77x).
[ Faint and diffuse outer coma diameter : 7', providing
m=10.1 (TK), remnant of previous outbursts.
Sidgwick method. Tycho-2 comparison stars. SQM : 21.0.].

38P/Stephan-Oterma:
2019 Jan. 1.85 UT: m1=9.9, Dia.=5', DC=3/,
Tail: 0.15 deg. in PA 260 deg, 20 cm SCT (100x).
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.1.].

46P/Wirtanen:
2019 Jan. 1.80 UT: m1=5.0, Dia.=40', DC=4, naked eye.
[ In 12x45 monocular: m1=5.2, Dia.=45', DC=3/;
several stars inside the coma, the brightest being
mag. 7.9 (TK). Sidgwick method. Tycho-2 comparison stars.
SQM : 21.2.].

64P/Swift-Gehrels:
2019 Jan. 1.87 UT: m1=9.1, Dia.=7', DC=3, 20 cm SCT (77x).
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.2.].

C/2016 R2 (PanSTARRS):
2019 Jan. 2.26 UT: m1=10.7, Dia.=6', DC=1, 20 cm SCT (100x).
[ Faint tail difficult to separate from the coma.
The magnitude estimate is related to the observed width of
the coma and tail. Several stars inside the coma, the brightest
being mag. 12.6 (AQ). Sidgwick method. Tycho-2 comparison stars.
SQM : 21.5.].

C/2018 L2 (ATLAS):
2019 Jan. 1.77 UT: m1=9.3, Dia.=6', DC=2/, 20 cm SCT (77x).
[ Altitude: 14 deg. Sidgwick method. Tycho-2 comparison stars.
SQM : 20.7.].

C/2018 N2 (ASASSN):
2019 Jan. 1.83 UT: m1=12.9, Dia.=0.8', DC=5, 20 cm SCT (133x).
[ Altitude: 12 deg. Sidgwick method. APASS comparison stars.
SQM : 20.9.].

C/2018 Y1 (Iwamoto):
2019 Jan. 2.25 UT: m1=9.2, Dia.=5', DC=2/, 20 cm SCT (77x).
[ Altitude: 19 deg. Sidgwick method. Tycho-2 comparison stars.
SQM : 20.8.].

( Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W;
SQM 21.5 at zenith.).

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ICQ Format :

29 2019 01 01.81 S 10.1 TK 20.3T10 77 7 1 ICQ
XX GON05

38 2019 01 01.85 S 9.9 TK 20.3T10 100 5 3/ 0.15 260 ICQ
XX GON05

46 2019 01 01.78 S 5.2 TK 4.5R 12 45 3/ ICQ XX
GON05

46 2019 01 01.80 S 5.0 TK 0.0E 1 40 4 ICQ XX
GON05

64 2019 01 01.87 S 9.1 TK 20.3T10 77 7 3 ICQ XX
GON05

2016R2 2019 01 02.26 S 10.7 TK 20.3T10 100 6 1 ICQ XX
GON05

2018L2 2019 01 01.77 S 9.3 TK 20.3T10 77 6 2/ ICQ XX
GON05

2018N2 2019 01 01.83 S 12.9 AQ 20.3T10 133 0.8 5 ICQ
XX GON05

2018Y1 2019 01 02.25 S 9.2 TK 20.3T10 77 5 2/ ICQ XX
GON05

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J. J. Gonzalez

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Colin James Watling

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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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