Re: Possible detection of C/2025 F2 on April 28.86
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Hi Thomas, Nick at all, my last image of the "Perihelium" of the Comet C/2025 F2 SWAN.... Very clear sky, despite moon light and light pollution... 68x7 sec at 1,84 Sec per Pixel with C14 F7,5 and CCD Best Regards? Andrea Aletti? MPC 204
Il mer 30 apr 2025, 08:50 Thomas Lehmann via <t.lehmann= [email protected]> ha scritto:
Nick, Andrea,
thanks for your update on successful observations, great achievment! It is quite
a challenge to image this fuzzy dust cloud and all depends on athmospherical
conditions. Despite fairly good weather the last few days, there has been the
usual haze and cirrus around at my site, so I could not image the comet again.
Thomas
> Am Wed, 30 Apr 2025 08:33:02 +0200
> schrieb "Andrea Aletti via " <aletti.andrea=[email protected]>:
>
> Dear all, from Schiaparelli Observatory the ex comet C2025 F2 near the NW
> Horizon two days ago in excellent sky condition
> Best Regards
> Andrea Aletti e Federico Bellini MPC204
>
> Il giorno mar 29 apr 2025 alle ore 23:46 Nick James via <comets=
> [email protected]> ha scritto:?
>
> > Thomas,
> >
> > Thanks. That's a great image. I've be plagued by distant cirrus near the
> > horizon to my northwest (probably aircraft contrails) so my transparency
> > has not been very good. I did have slightly better conditions tonight
> > (April 29.86) and the comet is more obvious in this stack:
> >
> >
> >
> > Nick.
> >
> >
> > On 29/04/2025 11:28, Thomas Lehmann via wrote:?
> > > Two nights earlier I have had a chance to observe whats left of the?
> > comet from?
> > > Weimar, Germany. The comet was at an altitude of only 5.5¡ã above horizon?
> > but I?
> > > gave it a try with my RASA 11" and ASI6200MC as conditions were?
> > exceptionally?
> > > good for my location.
> > > The brightness near the head (green color channel) as measured within an
> > > aperture of 3' is
> > >? ? 2025 04 26.84 UT, m=9.8mag
> > > and the tail extent is about 20' at P.A.=333¡ã
> > >
> > > I am attaching the stacked image (12 minutes total exposure time) and an
> > > inverted star trail subtracted and stronger smoothed image to highlight?
> > the?
> > > dust tail.
> > >
> > > Out of curiosity I am attaching a plot of differential extinction?
> > measured from?
> > > stars near the comet as it is taken into account by my AIRTOOLS software
> > > automatically.
> > >
> > > CS
> > > Thomas
> > >
> > >?
> > >> Am Tue, 29 Apr 2025 07:42:48 +0100
> > >> schrieb "Nick James"<comets@...>:
> > >>
> > >> Possible detection of C/2025 F2 (SWAN) on April 28.86:
> > >>
> > >>?
> > ?
> > >>
> > >> A very noisy image taken in very bright twilight but there is a faint
> > >> patch of material at the right location.
> > >>
> > >> Nick James. BAA
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>?
> >
> >
> >
> >
> >
> >
> >?
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