Fwd: [CometObs] Digest Number 3467

Comet Observations Group

2 Messages

Digest #3467

1

21P, 29P, 37P, 38P, 48P, 64P, 66P. by "Juan Jose Gonzalez" jjgsgp

2a

21P by danilam130

Messages

1

21P, 29P, 37P, 38P, 48P, 64P, 66P.

Tue Aug 21, 2018 7:39 am (PDT) . Posted by:

"Juan Jose Gonzalez" jjgsgp

21P/Giacobini-Zinner:
2018 Aug. 20.03 UT: m1=7.5, Dia.=6', DC=6/, 10x50B.
[In 25x100B : m1=7.8, Dia.=5', DC=6, Tail: 0.4 deg. in PA 260 deg,
Sidgwick method. Tycho-2 comparison stars.SQM : 21.3. ].

29P/Schwassmann-Wachmann:
2018 Aug. 20.09 UT: m=10.7:, Dia.=5', DC=1, 20 cm SCT (77x).
[ In evolution after the recent minor outburst. Brighter inner coma
magnitude was difficult to estimate due to close mag. 11.7 (Tycho-2) star.
Faint and diffuse outer coma diameter : 5', providing m=10.7: (Tycho)..
This faint outer coma is a remnant of previous outbursts. Sidgwick method.
Tycho-2 comparison stars. SQM : 21.5. ].

37P/Forbes:
2018 Aug. 20.10 UT: m1=10.5, Dia.=6', DC=1, 20 cm SCT (77x).
[ Observation made under better conditions, providing a wider diameter
and brighter magnitude estimate in comparison with my previous Aug. 15
observation. Faint tail difficult to separate from the coma. The bright
estimate (10.5) is related to the 6' observed width of the coma and tail.
Sidgwick method. Tycho-2 comparison stars. SQM : 21.5.].

38P/Stephan-Oterma:
2018 Aug. 20.15 UT: m1=10.5, Dia.=5', DC=2/, 20 cm SCT (77x).
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.1.].

48P/Johnson:
2018 Aug. 20.12 UT: m1=9.6, Dia.=7', DC=2, 20 cm SCT (77x).
[ Mag. 11.5 (TK) star in coma. Altitude: 19 deg. Sidgwick method.
Tycho-2 comparison stars. SQM : 21.2.].

64P/Swift-Gehrels:
2018 Aug. 20.06 UT: m1=13.1, Dia.=1.1', DC=4, 20 cm SCT (133x).
[ In evolution after the recent outburst. Brighter inner coma diameter :
1.1',
providing m=13.1 (APASS). Very faint and diffuse outer coma diameter :
7',
providing m=10.7:(Tycho). Sidgwick method. SQM : 21.5.].

66P/du Toit:
2018 Aug. 20.13 UT: m1=11.5, Dia.=5', DC=1/, 20 cm SCT (77x).
[ Faint tail difficult to separate from the coma. The bright estimate
(11.5)
is related to the 5' observed width of the coma and tail. Sidgwick method.
Tycho-2 comparison stars. SQM : 21.2.].

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

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

ICQ Format :

21 2018 08 20.02 S 7.8 TK 10.0B 25 5 6 0.4 260 ICQ XX
GON05

21 2018 08 20.03 S 7.5 TK 5.0B 10 6 6/ ICQ XX GON05

29 2018 08 20.09 S 20.3T10 77 ICQ XX GON05

37 2018 08 20.10 S 10.5 TK 20.3T10 77 6 1 ICQ XX GON05

38 2018 08 20.15 S 10.5 TK 20.3T10 77 5 2/ ICQ XX GON05

48 2018 08 20.12 S 9.6 TK 20.3T10 77 7 2 ICQ XX GON05

64 2018 08 20.06 S 13.1 AQ 20.3T10 133 1.1 4 ICQ XX
GON05

66 2018 08 20.13 S 11.5 TK 20.3T10 77 5 1/ ICQ XX GON05

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

J. J. Gonzalez

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

Reply to sender . Reply to group . Reply via Web Post . All Messages (1) . Top ^

2a

21P

Tue Aug 21, 2018 2:32 pm (PDT) . Posted by:

danilam130

Hi all!


VIS:
21P:


2018 Aug. 21.88 UT: m1=7.6, Dia.=8', DC=3, ...13-cm L, F:5 (25x) ...Danil Sidorko (Korenovsk, Russia)

Reply to sender . Reply to group . Reply via Web Post . All Messages (2) . Top ^

Visit Your Group

• Privacy • Unsubscribe • Terms of Use

--

Good Clear Skies

--

Astrocomet

--

Colin James Watling

--

Various Voluntary work-Litter Picking for Parish Council (Daytime) and also a friend of Kessingland Beach (Watchman)

--

Profile: http://www.google.com/profiles/astrocomera

--

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)

--

Lyra Main Website: http://www.lyra-astro.co.uk/