[BAA Comets] [comets-ml] Fw: C/2011L4 questions

[Uwe Pilz]

	Dear Denis,

	> How much dust 

	My simulation gives a dust production of 70 ... 80 tons per second
in perihel. 

	>  a gas component imaged in the tail?

	The dust tail is weak, but it does exist. Look at this image
http://kometen.fg-vds.de/pix/2011L4/2011L4_3_16032013.htm [1]

	> We have see and imaged the forward spike/antitail

	I don't believe in an antitail. We look at PanStarrs with not much
perspectival shortening.
The nature of the streamer on the southern part of the tail is not
complete clear for me. It could be a syndyname, but syndynames at
this positions consists of large particles (around 10µm) which means
the syndyname should be bent. But we see a straight feature. Still a
lot of wonders on comets.

	I am interested to read the answers you got from other sources like
BAA.

	--
Uwe Pilz, Leipzig, Germany

----- Ursprüngliche Nachricht -----
Von: comets-ml at yahoogroups.com [2]
An:"COML" , "BAA Comets discussion list" 
Cc:

	Gesendet:Thu, 18 Apr 2013 21:48:10 +0100
Betreff:[comets-ml] Fw: C/2011L4 questions

	 -----Original Message----- 
 From: denis buczynski
 Sent: Thursday, April 18, 2013 9:47 PM
 To: COML ; BAA Comets discussion list
 Subject: C/2011L4 questions

	 Hello all,
 Could anyone on this list answer a few questions about this comet's
physical appearance.
 Firstly, has there been an estimate of the physical size of the
nucleus?
2) How much dust has been released from the nucleus to maintain the
large fan tail we have seen and
 imaged for so long. Also has spectroscopy revealed the nature of
the material released from the
 nucleus.
 3) Has there been a gas component imaged in the tail? The colour
imaging has only shown a yellow fan
 with no blue gas feature.
 4) We have see and imaged the forward spike/antitail for a month or
more now , with little change in
 the PA of this feature with respect to the comet head. I assume
that as the viewing geometry is
 changing all the time as we are see the comet moving away from
earth. Why is the PA of this forward
 spike/antitail not changing with time? On Comet Arend- Roland the
antitail lasted only a few days
 (11 I believe) and was seen to swing round as the viewing geometry
changed.
 4) What is the cause of the forward spike/antitail, is it just a
question of viewing perspective.
 5) Has there been any specific professional observing campaign on
this comet?

	 Thank you in advance
 Denis Buczynski 

	 

	 +++++
KONSUMVERZICHT [5]:
Wie man auch ohne Geld leben kann
JETZT IM UNI.DE MAGAZIN.

Links:
------
[1] http://kometen.fg-vds.de/pix/2011L4/2011L4_3_16032013.htm
[2] mailto:comets-ml at yahoogroups.com
[3] mailto:comets-ml at yahoogroups.com
[4] mailto:comets-disc at britastro.org
[5] http://uni.de/redaktion/ohne-geld