Fwd: [CometObs] Digest Number 3448

Comet Observations Group

3 Messages

Digest #3448

1

OBS-V: 21P (2018 July 24) by "Maik Meyer" maiki666

2

C/2017 S3, C/2018 N1, 21P, 29P, 37P, 48P, 66P. by "Juan Jose Gonzalez" jjgsgp

3

OBS-V: 21P & 2017 S3 (2018-Jul-23) by "Man-To Hui" pachacotihui

Messages

1

OBS-V: 21P (2018 July 24)

Mon Jul 23, 2018 10:54 pm (PDT) . Posted by:

"Maik Meyer" maiki666

21 2018 07 24.04 M 9.1 TK 12.0R 5 30 3.5 4/ ICQ XX MEY

Limburg, Germany
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2

C/2017 S3, C/2018 N1, 21P, 29P, 37P, 48P, 66P.

Tue Jul 24, 2018 5:04 am (PDT) . Posted by:

"Juan Jose Gonzalez" jjgsgp

C/2017 S3 (PANSTARRS):
2018 July 22.08 UT: m1=8.1, Dia.=6', DC=5, 25x100B.
[ Fading from previous outburst. Altitude: 20 deg.
In 20 cm SCT (77x) : m1=8.5, Dia.=4', DC=4.
Sidgwick method. Tycho-2 comparison stars. SQM : 21.0.].

C/2018 N1 (NEOWISE):
2018 July 22.09 UT: m1=8.3, Dia.=15', DC=2, 20 cm SCT (77x).
[ Very diffuse and wide coma. Altitude: 17 deg.
Sidgwick method. Tycho-2 comparison stars. SQM : 21.2.].

21P/Giacobini-Zinner:
2018 July 22.10 UT: m1=9.5, Dia.=4', DC=4, 20 cm SCT (77x).
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.2.].

29P/Schwassmann-Wachmann:
2018 July 22.11 UT: m1=12.0, Dia.=2.5', DC=1/, 20 cm SCT (77x).
[ Field stars checked in DSS. Sidgwick method.
APASScomparison stars. SQM : 21.4.].

37P/Forbes:
2018 July 22.12 UT: m1=10.5, Dia.=5', DC=1/, 20 cm SCT (77x).
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.4.].

48P/Johnson:
2018 July 22.14 UT: m1=9.8, Dia.=6', DC=1/, 20 cm SCT (77x).
[ Observation made under better atmospheric conditions,
providing a wider outer coma diameter and brighter m1
in comparison with my previous July 18.13 estimate.
Altitude: 20 deg. Astronomical twilight. Sidgwick method.
Tycho-2 comparison stars. SQM : 20.8.].

66P/du Toit:
2018 July 22.13 UT: m1=10.0, Dia.=4', DC=2, 20 cm SCT (77x).
[ Beginning of astronomical twilight. Altitude: 19 deg.
Sidgwick method. Tycho-2 comparison stars. SQM : 21.2.].

( Quintanilla de los Oteros, Leon, Spain; Alt. 860 m, 42º 19' N, 5º 24' W;
SQM 21.4at zenith.).

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ICQ Format :

2017S3 2018 07 22.07 S 8.5 TK 20.3T10 77 4 4 ICQ XX GON05

2017S3 2018 07 22.08 S 8.1 TK 10.0B 25 6 5 ICQ
XX GON05

2018N1 2018 07 22.09 S 8.3 TK 20.3T10 77 15 2 ICQ XX GON05

21 2018 07 22.10 S 9.5 TK 20.3T10 77 4 4 ICQ XX GON05

29 2018 07 22.11 S 12.0 AQ 20.3T10 77 2.5 1/ ICQ XX GON05

37 2018 07 22.12 S 10.5 TK 20.3T10 77 5 1/ ICQ XX GON05

48 2018 07 22.14 S 9.8 TK 20.3T10 77 6 1/ ICQ XX GON05

66 2018 07 22.13 S 10.0 TK 20.3T10 77 4 2 ICQ XX GON05

----------------------------------------------------------

J. J. Gonzalez

----------------------------------------------------------

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3

OBS-V: 21P & 2017 S3 (2018-Jul-23)

Tue Jul 24, 2018 12:28 pm (PDT) . Posted by:

"Man-To Hui" pachacotihui

21P/Giocobini-Zinner
Jul 23.48, m1=9.4, Dia.=5', DC=5, Mt. Pinos, CA, USA; 20x80; twilight

C/2017 S3 (PANSTARRS)
2018
Jul 23.47, m1=8.5, Dia.=5', DC=3, Mt. Pinos, CA, USA; 20x80

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許文韜
Hui, Man To (Cantonese)
Xu, Wentao / Hsu, Wen Tao (Mandarin Chinese)
Hâu, Mắn Thẫu (Qin-Lian Yue / Hẵm-Lím Yụt)
Hí, Mùn Thâo (Hakka)
Hồ, Văn Thao (Vietnamese / Tiếng Kinh)
PhD candidate, Planetary Sciences in EPSS, UCLAM. Sc., EPSS, UCLA (2016)
B. Sc., School of Physics, Wuhan University (2008-2012)
Astrosite: comethunter.lamost.org
Blog: pachacoti.wordpress.com

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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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