[vsnet-chat 2381] [vsnet-chat] SN 1999em sequence problem

["Jean marie Llapasset" <jean-marie.llapasset@wanadoo.fr>]

Hello,

I have compare the image (991101.124)unfilterred with the
stars GSC,stars of UsnoSA2.0 and those of the sequence donnee by
Hitoshi Yamaoka.

Here results:

1)l'Image unfilterred give :
1.1)with 20 stars l'USNO SA2.0 --->SN = 13.47C
1.2)Avec la sequence de H.Yamaoka (mag GSC)---> SN = 14.45C
1.3)Avec 20 stars GSC--->SN=14.50C

2)L'image (991101.112) with Red filter give:
2.1) with 20 stars USNO SA2.0 ---> 13.59Rc
2.2) with  GSC04739-0434 (V=12.36 B-V=1.23,U-B=1.15 etR#11.7)(Brian Skiff),
----> SN = 13.53Rc

it is seen that the results of sequence H.Y and those of the GSC are
practically identical.  On the other hand, the estimate magnitude
with Usno sa2.0 (13.47C) is nearer to measurements of SN in the
image taken with the Red filter.

We wish opinions and councils.

Thank you

Merci

Jean Marie Llapasset
Obs 635  Perpignan (France)
http://perso.wanadoo.fr/jm.llapasset/
http://aude.geoman.net/observation/SN/sn.html

(thousand excuses for my English)

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