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Wednesday 25 July 2018

Fwd: [CometObs] Digest Number 3448

3 Messages

Digest #3448
1
OBS-V: 21P (2018 July 24) by "Maik Meyer" maiki666
2
3
OBS-V: 21P & 2017 S3 (2018-Jul-23) by "Man-To Hui" pachacotihui

Messages

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
--
If they give you ruled paper, write the other way. * Juan Ramon Jimenez
__________________________________________________________
http://www.comethunter.de * https://twitter.com/skymorph
http://groups.yahoo.com/group/comets-ml
http://cobs.si

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.).

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

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

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

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

-------------------------------------------------- 
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
Visit Your Group
Yahoo! Groups



--
Good Clear Skies
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Astrocomet
--
Colin James Watling
--
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 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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Tuesday 24 July 2018

[BAA-ebulletin 01012] WONDERFUL TOTAL ECLIPSE OF THE MOON NEXT FRIDAY

BAA electronic bulletin

WONDERFUL TOTAL ECLIPSE OF THE MOON NEXT FRIDAY

Next Friday evening, July 27, there will be a total eclipse of the Moon.
Eclipses of the Moon occur when the Full Moon passes through the cone of
shadow cast by the Earth into space. Weather permitting this will be an
fascinating event to watch from the UK because the Moon will rise totally
eclipsed, giving plenty of opportunities for stunning images of a 'ghostly
red Moon' above buildings and the landscape.

Moreover, this lunar eclipse is happening on the same night that Mars comes
to opposition (its best since 2003), with the brilliant Red Planet (at
magnitude -2.8 even brighter than Jupiter) lying just below the totally
eclipsed Moon. A blood red Moon near a stunning red Mars will surely make
this an event to remember!


A SPECTACULAR MOONRISE

The lunar eclipse begins at 17:15 UT (18:15 BST) when the Moon enters the
fainter outer part of the Earth's shadow known as the penumbra. The main
phase of the eclipse begins at 18:24 UT (19:24 BST) when the Moon first
enters the central, dark part of the Earth's shadow known as the umbra. The
eclipse becomes total at 19:30 UT (20:30 BST) and lasts for a full 1 hour 43
minutes (almost the maximum possible and the longest total lunar eclipse of
the 21st century), but from the UK the Moon will not rise until totality is
well underway, so the earlier phases of the spectacle will not be visible.
Maximum eclipse is at 20:22 UT (21:22 BST), and the Moon will have risen
from most parts of the British Isles (apart from the north and west of
Scotland and Northern Ireland) by this time

The exact time at which the totally eclipsed Moon will rise above the
south-eastern horizon on Friday evening varies from place to place as shown
below:

TIMES OF MOONRISE ON JULY 27

Brighton, 19:47 UT (20:47 BST)
London, 19:49 UT (20:49 BST)
Birmingham, 20:00 UT (21:00 BST)
Plymouth, 20:01 (21:01 BST)
Cardiff, 20:02 UT (21:02 BST)
York, 20:04 UT (21:04 BST)
Manchester, 20:06 UT (21:06 BST)
Newcastle-upon-Tyne, 20:11 UT (21:11 BST)
Dublin, 20:22 UT (21:22 BST)
Edinburgh, 20:22 UT (21:22 BST)
Glasgow, 20:26 UT (21:26 BST)
Belfast, 20:27 UT (21:27 BST)


TOTALITY

The visibility and appearance of the totally eclipsed Moon at moonrise will
depend on how clear the south-eastern sky is from your location at the time.
With the naked eye, the Moon may well not be discernible until it has risen
a few degrees above the local horizon, but with binoculars or a telescope it
will be seen more easily. It is while the Moon is still low in the sky that
there should be plenty of possibilities for interesting images. The BAA's
Lunar Section, Journal Editor and Website Manager would welcome such images.

The total phase of the eclipse ends at 21:13 UT (22:13 BST). As the Moon
will be passing centrally through the Earth's umbral shadow, it is probable
that the Moon may appear quite dark during mid-totality but one never quite
knows how dark or how bright a lunar eclipse will be. Everything depends on
the conditions in the Earth's upper atmosphere through which all light
falling onto the shadowed Moon has to pass. There have been eclipses when
the Moon has been difficult to find even with a telescope, while at other
eclipses it has remained bright red or vividly coloured. The Moon appears a
reddish hue because of Rayleigh scattering - the same effect that causes
sunrises and sunsets to appear reddish - and the refraction of that light by
the Earth's atmosphere into its umbral shadow.

The partial eclipse ends at 22:19 UT (23:19 BST), when the Moon exits the
umbra. The faint penumbral phase finally ends at 23:28 UT (00:28 BST on July
28).

This will be the first central lunar eclipse (i.e. passing through the
centre of the Earth's umbral shadow since 2011 June 15, with the Moon in
Capricornus and very near apogee, its furthest distance from the Earth. The
Moon's apparent diameter will be 29' 26.6".


ONE OF THREE...

Such an eclipse of the Moon never comes unaccompanied. A solar eclipse
always occurs about two weeks before or after a lunar eclipse. Usually,
there are two eclipses in a row, but sometimes there are three in the same
eclipse season. This is the second eclipse of the season. The first, a
partial solar eclipse on 2018 July 13, could be seen only from a very small
part of northern Antarctica and the third, another partial solar eclipse on
2018 August 11, will be seen from the far northern and eastern parts of
Europe, northern parts of North America and some northern and western
locations in Asia.

Some further information on this Friday's eclipse may be found on page 14 of
the 2018 BAA Handbook, and also at:
https://eclipse.gsfc.nasa.gov/LEplot/LEplot2001/LE2018Jul27T.pdf

Please send any images or other observations of this event to the BAA Lunar
Section.



This e-bulletin issued by:
Dr John Mason
BAA Press and Publicity Officer

2018 July 22

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http://lists.britastro.org/mailman/listinfo/baa-ebulletin
(c) 2018 British Astronomical Association    http://www.britastro.org/

--
Good Clear Skies
--
Astrocomet
--
Colin James Watling
--
Various Voluntary work-Litter Picking for Parish Council (Daytime) and also a friend of Kessingland Beach (Watchman)
--
--
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/
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