comète 46p/wirtanen Alpy600 T400

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comète 46p/wirtanen Alpy600 T400

Postby Dubreuil Pierre » Fri Dec 07, 2018 6:55 pm

bonsoir à tous

Hier soir, imagerie et spectres pour la comète du mois, 46P/wirtanen à l'observatoire Amateur de Calern (06 Fr).

Telescopt T400, Alpy600 caméra Atik 314L+

Comete 46P_20181206_pierre dubreuil.png
46P/wirtanen au T400 O.C.A. Calern


A suivre

Pierre
Dubreuil Pierre
 
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Re: comète 46p/wirtanen Alpy600 T400

Postby Robin Leadbeater » Sat Dec 08, 2018 8:38 pm

Hello Pierre,

I was also thinking of trying this comet but you got it, congratulations!
It must be a difficult target because it is so diffuse. How did it look in the guider ? How did you guide ? How did you subtract the background ?

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
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Re: comète 46p/wirtanen Alpy600 T400

Postby Hubert Boussier » Sun Dec 09, 2018 12:08 am

Bonsoir Pierre,

Je vois que tu prends goût aux comètes ;) .
46P Wirtanen est pratiquement au plus proche de la terre, il fallait en profiter, nous en avons fait un spectre au même moment :
http://lesia.obspm.fr/comets/lib/displa ... ?Num=20132

Cette fin d'années est riche en comètes, il y en a eu trois ou quatre faisables avec des "petits" télescopes : 46P, 64P, 38P et C/2018 V1 (Machholz-Fujikawa-Iwamoto).


Robin ==> It was not so difficult to guide with a Atik 314L, 8s of exposure time, the comet core is quite condensed. I did subtract the background like I do for a star, but staying away (30pixel) from the comet.
After reduction data reduction, I divided the 46P spectrum by a spectrum of the moon light taken a few days before, this did not change drastically the shape of the spectrum.
Hubert Boussier
 
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Re: comète 46p/wirtanen Alpy600 T400

Postby Dubreuil Pierre » Sun Dec 09, 2018 8:25 am

hello Robin, Hubert

Robin
I join Hubert for the guiding , not easy but feasible with times of poses for the guiding camera of several seconds (8s in our case).
In my spectrum we can see Halpha! but I did not subtract the solar spectrum.

Hubert
Je vais envoyer le FIT du spectre à François Teyssier pour le déposer dans la rubrique qui va bien.

Cordialement

Pierre
Dubreuil Pierre
 
Posts: 67
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Re: comète 46p/wirtanen Alpy600 T400

Postby Robin Leadbeater » Sun Dec 09, 2018 1:52 pm

Excellent ! Thank you both

I will try it tonight if it stays clear

Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
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Re: comète 46p/wirtanen Alpy600 T400

Postby Robin Leadbeater » Mon Dec 10, 2018 12:45 am

A raw spectrum image (9x300s) from this evening taken using the Celestron C11 and ALPY 600

Comet 46P-Wirtanen_20181209_ALPY600_9x300s_raw_crop.jpg
Comet 46P-Wirtanen_20181209_ALPY600_9x300s_raw_crop.jpg (148.45 KiB) Viewed 5 times


It shows the very condensed (almost stellar in appearance) dusty? central region, which appears to be dominated by the spectrum of reflected sunlight. (A solar analogue reference star was also recorded to attempt to extract the comet spectral signature in this region)

The diffuse outer region of the coma which extends well beyond the length of the slit (6 arcmin) shows clear Swan and other molecular bands, along with many sky lines from air glow and artificial light pollution. (which hopefully can be subtracted using separate sky measurements a couple of degrees away from the comet)

Cheers

Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
Posts: 1115
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