Fwd: [CometObs] Digest Number 3545

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Digest #3545

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C/2018 L2, C/2018 Y1, 29P, 38P, 46P, 64P, 78P. by "Juan Jose Gonzalez" jjgsgp

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C/2018 L2, C/2018 Y1, 29P, 38P, 46P, 64P, 78P.

Tue Jan 8, 2019 7:41 am (PST) . Posted by:

"Juan Jose Gonzalez" jjgsgp

C/2018 L2 (ATLAS):
- 2019 Jan. 6.78 UT: m1=9.4, Dia.=6', DC=2, 20 cm SCT (77x).
[ Altitude: 13 deg. Sidgwick method. Tycho-2 comparison stars.
SQM : 20.7; 21.2 at zenith.].

C/2018 Y1 (Iwamoto):
- 2019 Jan. 7.26 UT: m1=8.9, Dia.=8', DC=2/, 20 cm SCT (77x).
[ Altitude: 22 deg. Sidgwick method. Tycho-2 comparison stars.
SQM : 20.7; 21.6 at zenith.].

29P/Schwassmann-Wachmann:
- 2019 Jan. 6.80 UT: m1=10.1, Dia.=6', DC=1, 20 cm SCT (77x).
[ Faint and diffuse outer coma diameter : 6', providing m=10.1,
remnant of previous outbursts. Sidgwick method. Tycho-2 comparison stars.
Several stars inside the coma, the brightest being mag. 12.5 (APASS).
SQM : 20.9; 21.2 at zenith.].

38P/Stephan-Oterma:
- 2019 Jan. 4.87 UT: m1=9.9, Dia.=5', DC=3,
Tail: 0.15 deg. in PA 260 deg, 20 cm SCT (77x).
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.0; 21.3 at zenith.].
- 2019 Jan. 6.84 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 : 21.0; 21.2 at zenith.].

46P/Wirtanen:
- 2019 Jan. 6.85 UT: m1=5.5, Dia.=35', DC=3/, 12x45 monocular.
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.1; 21.2 at zenith.].
- 2019 Jan. 7.16 UT: m1=5.4, Dia.=40', DC=3/, 12x45 monocular.
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.6.].

64P/Swift-Gehrels:
- 2019 Jan. 4.89 UT: m1=9.3, Dia.=7', DC=3, 20 cm SCT (77x).
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.2; 21.3 at zenith.].
- 2019 Jan. 6.82 UT: m1=9.0, Dia.=8', DC=3, 20 cm SCT (77x).
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.2.].

78P/Gehrels:
- 2019 Jan. 6.81 UT: m1=11.7, Dia.=3', DC=3, 20 cm SCT (133x).
[ Sidgwick method. APASS comparison stars. SQM : 20.9; 21.2 at zenith.].

Jan. 4 : Les Retuertes - Sierra del Aramo, Asturias, Spain; alt. 1350 m,
43º 10' N, 5º 54' W; SQM : 21.3 at zenith.

Jan. 6 + 7 : Alto del Castro, Leon; Alt. 1720 m, 42º 54' N, 5º 48' W;
SQM : 21.2 to 21.6 at zenith.

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ICQ Format :

2018L2 2019 01 06.78 S 9.4 TK 20.3T10 77 6 2 ICQ XX
GON05

2018Y1 2019 01 07.26 S 8.9 TK 20.3T10 77 8 2/ ICQ XX
GON05

29 2019 01 06.80 S 10.1 TK 20.3T10 77 6 1 ICQ XX
GON05

38 2019 01 04.87 S 9.9 TK 20.3T10 77 5 3 0.15 260 ICQ
XX GON05

38 2019 01 06.84 S 9.9 TK 20.3T10 100 5 3/ 0.15 260 ICQ
XX GON05

46 2019 01 06.85 S 5.5 TK 4.5R 12 35 3/ ICQ XX
GON05

46 2019 01 07.16 S 5.4 TK 4.5R 12 40 3/ ICQ XX
GON05

64 2019 01 04.89 S 9.3 TK 20.3T10 77 7 3 ICQ XX
GON05

64 2019 01 06.82 S 9.0 TK 20.3T10 77 8 3 ICQ XX
GON05

78 2019 01 06.81 S 11.7 AQ 20.3T10 133 3 3 ICQ XX
GON05

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J. J. Gonzalez

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