Тема: Возвращение кометы 73P/SCHWASSMANN-WACHMANN!!!

[ctac]

 Возможно данный блеск определяется вспышечной активностью...
 Значит можно ожидать и падения блеска...

9382
From: Seiichi Yoshida <comet@...>
Date: Thu Mar 2, 2006 5:47pm
Subject: Re: 73P-G
seiichi_yosh...
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Dear colleagues,Nakano and some other Japanese calculators succeeded to link therecent observations of component G with the component E in 2001.If the component G is actually E in 2001, it is about 3-4 mag fainterthan 2001.
  http://www.aerith.net/comet/catalog/0073P/2006.html Kadota reported it was fainter than 19 mag on Feb. 9.73, but bright as 18.1 mag on Feb. 13.78. Maybe it brightened rapidly in a short time.The light curve of the component E was unusual in 2001. It fadedbefore the perihelion passage. So the future brightness evolution isvery uncertain.Best regards,--Seiichi Yoshida http://www.aerith.net/

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 27 February 2006
IAU Circular No.8679

COMET 73P/SCHWASSMANN-WACHMANN
--------------------------------------------------------------------------------
 

     Another companion to comet 73P (cf. IAUC 8659, 8663) has been
found by R. A. Tucker (Tucson, AZ, 0.35-m reflector, on Feb. 20.4
and 22.4 UT) and E. J. Christensen (at mag 17.2 with a 15" coma and
a fanlike tail approximately 20" long in p.a. 250-310 deg on Mt.
Lemmon Survey images taken on Feb. 24.5, with additional images
also acquired on Feb. 25.5), denoted component 'G' on MPEC 2006-D47.
Z. Sekanina, Jet Propulsion Laboratory, notes that this companion
is not likely to be 'E' or 'F'.  The positions of component 'G' are
consistent with the orbit for component 'B' (cf. MPEC 2006-B27, MPC
55982) but with T = 2006 June 8.11 TT ('B' has T = June 7.94, and
'C' has T = June 6.95; cf. MPC 55524).



1 March 2006
IAU Circular No.8681

 COMET 73P/SCHWASSMANN-WACHMANN
--------------------------------------------------------------------------------
 

     D. Schleicher, Lowell Observatory, obtained narrowband
photometry of comet 73P on Feb. 25 at r = 1.65 AU using the Hall
1.1-m telescope at Lowell Observatory, with the following averaged
results for component C:  log Q(OH) = 27.30; equivalent log Q(water;
vectorial) = 27.33; log Q(CN) = 24.89; log Q(C_2) = 24.01; log
Af(rho) = 1.7 (cf. IAUC 7342).  For component B:  log Q(OH) = 26.8;
loq Q(water) = 26.8; log Af(rho) = 1.1.  The relative C_2-to-CN
ratio for component C is strongly depleted (by 10 times) with
respect to "normal", as defined by A'Hearn et al. (1995, Icarus 118,
223) -- consistent with the upper-limit result for 73P determined
by Fink and Hicks (1996, Ap.J. 459, 729).  To within relatively
large uncertainties, component B exhibits the same depletion of C_2
as does component C.

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Элементы орбиты 73P-G:
http://www9.ocn.ne.jp/~comet/eph/0073pg.html

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Все семь компонентов:

http://www.aerith.net/comet/catalog/0073P/2006.html

[ctac]

--------------------------------------------------------------------------------
COMET 73P/SCHWASSMANN-WACHMANN
--------------------------------------------------------------------------------
 

     E. J. Christensen, Lunar and Planetary Laboratory, writes that
four co-added unfiltered 150-s images obtained with the Mt. Lemmon
1.5-m reflector on Mar. 5.4 UT by R. E. Hill -- who was following
up a new fragment of comet 73P found by R. Kowalski from Mar. 4.4
images -- show four additional fragments, all lying along an
extension of the arc from component 'B' to component 'G' (p.a.
approximately 300 deg), and bringing the number of currently
observed components to seven (cf. IAUC 8679).  Kowalski's fragment,
designated component 'H', has mag 20.0 and trails fragment 'G' by
approximately 875" (corresponding to T = 2006 June 8.29 TT); it
displays a diffuse 4" coma with no central condensation, slightly
elongated toward p.a. 275 deg.  Component 'J', which had been noted
by Hill as cometary, trails component 'G' by approximately 170" (T
= June 8.14), and displays a diffuse 8" coma of mag 19.8 with a
very slight central condensation and a 10" tail toward p.a. 275 deg;
90-s images taken by Christensen on Feb. 24 showed nothing at the
presumed location of 'J'.  Component 'K' (at mag 21.7) lies
approximately 611" from fragment 'G' (T = June 8.24) and shows a
diffuse 4" coma with neither central condensation nor tail.
Component 'L' lies approximately 1145" from fragment 'G' (T = June
8.35) and displays a slightly condensed 5" coma of mag 19.8 with a
7" tail toward p.a. 275 deg.  For comparison, components 'B' and 'G'
were of mag 14.5 and 17.3, respectively, on Mar. 5.4 (all the Mt.
Lemmon magnitudes being calibrated to V).  Christensen searched the
line of variation on the Mar. 5 images, out to 3500" from fragment
'G', but could find no other fragments (limiting mag V
approximately 22.0).  Inspection of Kowalski's 120-s images from
Mar. 4 yields no trace of fragments 'J', 'K', and 'L' -- although
the area that should contain these fragments was unfortunately
affected by reflections from a nearby bright star.  Four 150-s
unfiltered images taken on Mar. 6.5 show no significant changes in
the morphologies of any of the fragments since the previous night,
and no additional fragments were detected along the line of
variation out to approximately 2880" west-northwest of component 'B'
and to approximately 1580" east-southeast of component 'B'
(limiting mag V approximately 22.0).  The new astrometry is
published on MPEC 2006-E32.
     Visual total-magnitude estimates of component 'C':  Feb. 27.68
UT, 12.3 (S. Yoshida, Ibaraki, Japan, 0.40-m reflector); 28.19,
12.8 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector); Mar. 2.90,
11.7 (A. Baransky, Pylypovychi, Ukraine, 0.36-m reflector); 5.61,
12.1 (Yoshida); 6.32, 11.3 (W. Robledo, Cordoba, Argentina, 0.20-m
reflector); 8.19, 11.9 (Gonzalez).  Visual total-magnitude
estimates of component 'B':  Feb. 27.68, 14.4 (Yoshida); Mar. 8.20,
13.7 (Gonzalez).

2006 March 8                   (8685)       

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Новые компоненты - M и N
MPEC 2006-F22

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Компоненты P, Q, R, S
MPEC 2006-F33

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MPEC 2006-G10:

2 апреля найдены компоненты T-Y. Итак, сейчас известно около 20 компонентов!

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С. Йошида пишет:

IAUC 8679 - элементы орбиты 73P-G,
IAUC 8685 - элементы орбит 73P-H, J, K, L

P. S. Желательно поискать элементы орбит компонентов кометы из IAUC 8679, 8681, 8685, 8692, 8693.

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Позавчера компонент B  вспыхнул, повысив яркость на 1.0 - 1.5^m. Теперь он ~ 10.8^m! По-видимому, ядро кометы распадается.

73P-B outburst

[ctac]

 Элементы орбит для многих компанент:
http://cfa-www.harvard.edu/mpec/K06/K06G28.html

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Более качественные элементы орбит всех компонентов:
NK 1303

Элементы орбит из MPEC не достаточно точны: в них элементы орбит всех фрагментов резко отличаются, т. к. для расчета орбиты использовалось малое количество наблюдений. В NK 1303 для расчета использовались также наблюдения компонентов B и E в 2001 году - в предполагаемое время отделения недавно обнаруженных компонентов от более старых и крупных.

Кстати говоря, по всей видимости, компонент G соответствует компоненту E, наблюдавшемуся в 2001 году. Их орбиты довольно сильно различаются, но это, скорее всего, из-за возмущений от других фрагментов; к тому же, компонент E слишком мало наблюдался, чтобы вычислить для него достаточно точные элементы орбиты.

[ctac]

 Компанента "В" эволюционирует! Видимо развал в активной стадии (мримерно тот же материал есть и у меня, только он еще не обработан):

I have just grabbed a few images of this fragment, from Bellatrix
astronomical Observatory, using a C11@f/7 and a SBIG ST-7XME camera;
resulting scale is 0.9"/pixel: seeing was quite good. I managed to sum 8
images, each integrated for 60 seconds. You can see it here:

 

the "head" is apparently detached, as also shown by the photometric profile,
along the comet axis:



More later,
Gianluca
Minor Planet Center Obs. Code: 470 - Ceccano

 Кстати, компанента видет себя очень похоже на C/1999 S4 (LINEAR), что была основной целью моей первой поездки в САО еще 6 лет назад

 Вот еще ссылка на подобные снимки .

[ctac]

Продолжаем обзор за неделю:

 Анимация, полета "В", отснятая 16 апреля с 14" MEADE и Canon 20D: http://c3po.cochise.edu/astro/images13a.htm



73P Fragment B April 16, 2006 0601UT
300 second exposure 0.3 m SCT @F6.3 + ST-2000XCM + AO7

http://www.quantumhyperspace.com/imagefiles/73P-B-04162005-0601UT.jpg


73P Fragment C April 16, 2006 0515UT
300 second exposure 0.3 m SCT @F6.3 + ST-2000XCM + AO7

http://www.quantumhyperspace.com/imagefiles/73P-C-04162005-0515UT.jpg

Charles Bell


"B" component:
 http://www.arksky.org/asoimg/ComBD65065.jpg

"C" component:
http://www.arksky.org/asoimg/ComBD650E0.jpg

"G" component:
http://www.arksky.org/asoimg/ComBD65128.jpg

"R" component:
http://www.arksky.org/asoimg/ComBD65170.jpg

Clay
--------------------
Dr. P. Clay Sherrod
Arkansas Sky Observatories
Harvard MPC H41 (Petit Jean Mountain)
Harvard MPC H45 (Petit Jean Mountain South)
Harvard MPC H43 (Conway)
Harvard MPC H44 (Cascade Mountain)
http://www.arksky.org/

http://www.cometwatch.com/comets.html - тут сники от самого известного современного ловца сверхновых, Тима Паккета и его 60-см телескопа  
 "Here are 3 unfiltered fits files of component "B" just taken
with my 0.60m rc + Site 502AB ccd,  three 90 second exposures.
I do not see any fragmentation at this time."

 
 
Еще:
 Links to Component B:
http://www.arksky.org/asoimg/ComBD7CA14.jpg (negative enhanced)
http://www.arksky.org/asoimg/ComBD7C9EF.jpg (with high resolution inset of
nucleus)

Link to Component C:
http://www.arksky.org/asoimg/ComBD7CC8A.jpg

Интересное заявление:

 Mike Holloway, Apr 19, 2006 1:49am , Subject: Comet 73P-B & - значит это что "Р"-фрагмент так хорошо виден!!!? или это другой компанент?

 "Hopefully my filling system is straight enough to post images from
04/18/2006.  There are two links.  The first is a 9x45 sec exposure
stacked on the comet and croped/resized from an original 2150 wide pix
to 1200 wide.  Stack on the comet.
http://www.fototime.com/D236599C7CAF6B5/orig.jpg
The second from a different set of images is a 4x45 sec image stack on
the stars.
http://www.fototime.com/2AA68340595B45C/orig.jpg
Thanks, Mike H."

 Еще: Mike Holloway, Apr 19, 2006 2:31am ,  73P-C-04182006,

 " 4x45 sec exp Used a 4"FSQ refractor and FLI CCD-
Thanks, Mike H.
http://www.fototime.com/92DFB5E092E5169/orig.jpg "


 
 From: "P. Clay Sherrod" <drclay@...>
Date: Wed Apr 19, 2006 5:49pm
Subject: 73-b fragmentation, ASO 


 73P Schwassmann-Wachmann component "B", showing clear fragmentation within the
nucleus (inset) and highly elongated coma; magnitude measured = 10.0 (m1, ccd).
Component "G" is developing nicely and seems to be somewhat more active.

Component "B"
http://www.arksky.org/asoimg/ComBD8F5E9.jpg  and
http://www.arksky.org/asoimg/ComBD8F645.jpg (negative image, enhanced)

Component "C"
http://www.arksky.org/asoimg/ComBD8F97F.jpg

Component "G"
http://www.arksky.org/asoimg/ComBD8FB1C.jpg

Clay
--------------------
Dr. P. Clay Sherrod
Arkansas Sky Observatories
Harvard MPC H41 (Petit Jean Mountain)
Harvard MPC H45 (Petit Jean Mountain South)
Harvard MPC H43 (Conway)
Harvard MPC H44 (Cascade Mountain)
http://www.arksky.org/

Очень хорошую анимацию изменения вида фрагмента B за неделю сделал итальянец из Remanzacco Observatory (по сслке видно только тем, кто зарегестрированн на маил-рассылке яхо-группы наблюдателей комет). Весит анимация около 350Кб.

 From: Tim Puckett
Date: Wed Apr 19, 2006 11:53pm
Subject: hi res of 73_b with 60cm RC
 


Here is another image taken last night.
Apr. 19.252 UT
single 90 second image.
Cheers Tim

__________________
THE PUCKETT OBSERVATORY
 

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Множество компонентов кометы 73P пережили вспышку в первых числах апреля. Некоторые из них ослабли в блеске, другие сохранили прежнюю яркость. По-видимому, комета имеет тенденцию вспыхивать за 60 дней до перигелия.



Подобная активность была отмечена С.Йошидой у компонента E в 2001 г. (http://www.aerith.net/comet/catalog/0073P/2001.html)



Кристенсен ещё 2 апреля заснял 40 компонентов при помощи 1,5-метрового рефлектора. Многие из них не получили буквенного обозначения, т.к. обозначение компоненту дается только тогда, когда его пронаблюдают не менее двух раз.
http://groups.yahoo.com/group/comets-ml/message/9515