[vsnet-chat 1106] (fwd) RV: Re: [vsnet 1499] Larry Robinson's SN1998dh image

[Taichi Kato <tkato>]

From drodrig@globalmail.net Mon Aug  3 19:41 JST 1998
From: "Diego Rodriguez" <drodrig@globalmail.net>
To: <tkato@kusastro.kyoto-u.ac.jp>
Cc: "Yamaoka Hitoshi" <yamaoka@rc.kyushu-u.ac.jp>,
        <vsnet-alert@kusastro.kyoto-u.ac.jp>
Subject: RV:  Re: [vsnet 1499] Larry Robinson's SN1998dh image
Date: Mon, 3 Aug 1998 12:38:15 -0600
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hello All.
I took several images( August 2.99) of Sn1998dh +CCD V filter, mag 14.15  
Reference Star GSC 580774 mag 12.9

Diego Rodriguez 
Madrid Spain
drodrig@globalmail.net
M1 Group
**********************************

>Dear SN watchers,
>
>Larry Robinson wrote:
>
>> Object        Date    U.T.     R.A.  (2000.0)  Decl.   Mag.   Observer
>>SN1998dh     1998 08 02.26876  23 14 37.23 +04 32 19.5  13.2 V Sunflower
>>Observ
>
>This magnitude is quite brighter than other estimates.  He wrote he
>have used Astrometrica and USNO-SA as reference stars, but it is
>uncertain which stars are choosed as a photometry reference.  
>
>I have seen the image
>(http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/SNe/sn1998dh/robinson.jpg)
>which seems to me that SN 1998dh was about 14.0 mag or so, comparing
>with 1306 and 1456 stars (USNO-A1.0).  
>
>Is this a problem of reference stars or of a software?
>
>Sincerely Yours,
>Hitoshi Yamaoka, Kyushu Univ., Japan
>yamaoka@rc.kyushu-u.ac.jp

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