[vsnet-chat 2957] Re: CP Dra in 1904

[Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>]

B. Skiff wrote:
>     I have examined Dorothea Roberts' 1914 report in the
>"Astronomische Nachrichten" 197, 57.  This includes a reproduction of
>the April 1904 plate along with some annotations about the mysterious
>mag. 13-14 star.  

Thank you, Brian.  

> Comparison of the plate with the DSS indicates that the object is
>indeed CP Dra, visible at about red mag. 19 on the POSS-I plate at:
>10 15 39.8  + 73 26 06 (2000) by my estimate using a SkyView image.  

Also it is seen as rmag about 19 on DSS2 R image (1991 Dec. 07).  The
rough position is: 10 15 40.1, +73 26 04 (2000) from the WCS in the
fits header. 

So, GCVS position and the atlas in Bruch et al. (1987) is enough
accurate, I guess.  

tkato wrote:
>   Perhaps this suggests that frequent visitors to CP Dra may have a
>better chance to discover a SN than to watch other field dwarf novae
>;-). 

Because NGC 3147 is an active (Seyfert2) galaxy, it is considerable
that this galaxy is good producer of core-collapsing SNe, though the
historical SNe (72H, 97bq) are thought to be both of type Ia ;-).  

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

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