C/2018 Y1 et questions?

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Re: C/2018 Y1 et questions?

Postby Gerard Arlic » Wed Feb 20, 2019 7:16 pm

Hello Robin
Thank you for your intervention
it is not simple spectroscopy!
I will try to improve my treatment
Cheers
Gérard
Star Analyser 100; Atik 383L; T200/1000
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Re: C/2018 Y1 et questions?

Postby etienne bertrand » Wed Feb 20, 2019 10:11 pm

Attends Gérard, maintenant tu es un pro !! En plus tu vas au Pic comme à la maison ;)
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Re: C/2018 Y1 et questions?

Postby Gerard Arlic » Thu Feb 21, 2019 9:49 am

etienne bertrand wrote:Attends Gérard, maintenant tu es un pro !! En plus tu vas au Pic comme à la maison ;)

T'as raison :? quel pro! je me bagarre avec cette caméra!! bon, je n'ai pas les moyens d'en acheter une autre
je ne comprenais pas pourquoi ni Isis ni Démétra ne parvenaient à trouver les raies sur mes calibrations
Image
il ne me reste plus qu'à faire des essais en fenêtrant pour voir si les softs retrouvent leurs petits
je vais au Pic comme j'irais à l'école, car j'y profite de la présences des copains bien plus avancés que moi
Star Analyser 100; Atik 383L; T200/1000
Gerard Arlic
 
Posts: 145
Joined: Mon Jul 10, 2017 10:25 pm

Re: C/2018 Y1 et questions?

Postby Robin Leadbeater » Thu Feb 21, 2019 1:35 pm

Hello Gerard,

Have you calculated the pixel size to use ? (This is not the same as the actual pixel size)

"A tip for calculate the scaling factor p (or virtual pixel size). Use the formula:

p = 3123 / dx

where dx is the distance between the H alpha and H beta lines measured in pixels along the horizontal axis in a raw image. Try to find the distance to the nearest pixel (the reading of the mouse pointer is sufficient). In the example, the H alpha line is at x = 882, while the H beta line is at x = 535. So dx = 882-534 = 347, and thus the pixel size to adopt is p = 3123/347 = 9.00 pixels."

From this page
http://www.astrosurf.com/buil/isis/guid ... ration.htm

Sometimes you still need to change the pixel size in very small steps until the RMS error drops when all lines are found.

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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Re: C/2018 Y1 et questions?

Postby etienne bertrand » Thu Feb 21, 2019 4:05 pm

Tu veux vendre ta caméra CCD ? J'en cherche une pour imager mais je peux pas y mettre trop cher...
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Re: C/2018 Y1 et questions?

Postby Gerard Arlic » Thu Feb 21, 2019 7:12 pm

Robin Leadbeater wrote:Have you calculated the pixel size to use ? (This is not the same as the actual pixel size)

Thank you very much Robin
I knew that but .... I forgot it!
by doing that I find 5.224 instead of 5.4 and that changes everything
Isis finds all the Balmer rays
for the lines of the calibration module by cons it is always the same
thanks to you, I'm moving forward!

as you will have guessed, I do not speak English, it's google that translates :)
Star Analyser 100; Atik 383L; T200/1000
Gerard Arlic
 
Posts: 145
Joined: Mon Jul 10, 2017 10:25 pm

Re: C/2018 Y1 et questions?

Postby Gerard Arlic » Thu Feb 21, 2019 7:16 pm

etienne bertrand wrote:Tu veux vendre ta caméra CCD ? J'en cherche une pour imager mais je peux pas y mettre trop cher...

non, elle me sert pour d'autres choses que la spectro, en grand champs halpha par ex elle se débrouille bien
non, mais je regrette mon antique Atik 16HR qui aurait été parfaite pour la spectro mais qui est en rade sans doute définitivement
Star Analyser 100; Atik 383L; T200/1000
Gerard Arlic
 
Posts: 145
Joined: Mon Jul 10, 2017 10:25 pm

Re: C/2018 Y1 et questions?

Postby Robin Leadbeater » Fri Feb 22, 2019 1:44 am

Gerard Arlic wrote:as you will have guessed, I do not speak English, it's google that translates :)


C'est presque le même pour moi. Je parle français tres mal, comme un ecolier :lol:
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
Posts: 1236
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