[vsnet-alert 10600] Re: V1251 Cyg rare (super)outburst!

[Hubert Hautecler]

Hi Mr. Kato,

please check my date of observation in your list of observations. The 
correct one is :

JD 2454759.3340 (2008 Oct 19.834 UT),
m(vis) = 12.4 (H. Hautecler);

JD 2454759.3646 (2008 Oct 19.8646),
m(vis) = 12.5 (E. Muyllaert).


clear skies, Hubert



At 03:05 10/20/2008, Taichi Kato wrote:
>    As reported by a number of observers, the SU UMa-type dwarf nova
>V1251 Cyg is undergoing one of its rare outburst (being in the high
>northern sky, it is unlikely many outbursts have been missed).
>The last confirmed outburst (superoutburst) was in 1997 Sep.,
>when the object reached a relatively faint maximum (mag 13.3).
>The object underwent a similar faint superoutburst in 1994 Dec. -
>1995 Jan. (superhumps were confirmed).
>The earlier (first-ever outburst since its discovery as a potential
>nova) outburst was in 1991 Oct., when then object underwent a bright
>outburst similar to the current, and the discovery in 1963, ones
>(cf. IAUC 5377; IBVS 123, IBVS 3689).  The observation of the 1991
>superoutburst is available in IBVS 4152.
>
>   The outburst properties and development of superhumps were unusual
>for an SU UMa-type dwarf nova with a superhump period of 0.07604 d
>(large outburst amplitude, rare outbursts, no or rare normal outbursts,
>relatively slow development of superhumps).  These properties may
>suggest that V1251 Cyg behaves as if it is the longest-Psh analog of
>WZ Sge-type dwarf novae (see also PASJ 53, 1191, "HV Vir and WZ Sge-Type
>Dwarf Novae").
>
>   Time-resolved photometry during the current outburst is most critically
>desired!!
>
>   YYYYMMDD(UT)   mag  observer
>   20081016.998  <16.10C  (Gary Poyner)
>   20081017.794  <170C  (Jochen Pietz)
>   20081018.794  <146  (Eddy Muyllaert)
>   20081018.842  169C  (Jochen Pietz)
>   20081019.790  <133  (Patrick Schmeer)
>   20081019.790  <133  (Patrick Schmeer)
>   20081019.865   125  (Eddy Muyllaert)
>   20081019.871   124  (Patrick Schmeer)
>   20081019.871   124  (Patrick Schmeer)
>   20081019.881  127C  (Jochen Pietz)
>   20081019.883   124  (Hubert Hautecler)
>   20081019.940  12.62V  (Etienne Morelle)