[kuuplan-l] T. Lovejoy teki jälleen komeettalöydön..
veijo.kallio at baanamail.fi
To toukokuu 31 11:08:48 EEST 2007
----- Alkuperäinen viesti -----
Lähettäjä: Terry Lovejoy <terryjlovejoy at yahoo.com>
Päiväys: Wednesday, May 30, 2007 6:35 am
Otsikko: [comets-ml] The discovery of C/2007 K5
Vastaanottaja: comets-ml at yahoogroups.com
> Discovery of Comet C/2007K5
> First of all a big thank you to all your kind words :)
> After a discovering Comet C/2007 E2 on March 15 this year, I am
> to report finding another Comet just 2 months later!
> Naturally I am
> elated, especially since this one was a much tougher and
> find, proving my techniques are working.
> This particular comet (designated C/2007K5) was found as a small
> faint but still rather obvious blue-green haze in my images from
> evening of May 26. My initial estimate is mag 13, but I
> admit I have
> not attempted more precise photometry and visually the comet
> well be brighter. Interestingly the discovery was made
> during a
> bright waxing moon and in the evening sky where moderate light
> pollution prevails. On the evening I had both cameras (a
> Canon 300D
> + Canon 350D) mounted the usual way with the 300D pointed
> towards -18
> declination and the 350D pointed towards declination -11.
> allows me to image 13 degree wide sweep of sky from west to
> Some 12 individual starfields were covered with both cameras,
> with 12
> subexposures of 90 seconds for each starfield.
> The following day, I downloaded the images from my 300D and ran
> through the usual automated processing steps (IRIS is used for
> This processing step outputs 2 images per starfield effectively
> separated by 10 minutes so that moving objects like comets can
> identified. By 'blinking' the 2 images one can see objects
> asteroids and comets bobbing backwards and forwards. On
> the first image I almost immediately noticed a moving small hazy
> object with a distinctive blue green colour typical of many
> I knew I had something for sure, and notified a number of other
> confirmation of a possible comet.
> Confirmation came on May 28 when both John Drummond and I made
> followup observations, which were then sent to Dan Green at
> Further followup was obtained on May 29 by Rob McNaught before
> official circular (IAUC 8840) announced the new comet as C/2007
> Interesting, C/2007 K5 required less than 20 hours of actual
> searching in contrast to the estimated 1400 hours for C/2007 E2.
> The comet itself appears to be quite faint, and will problably
> that way, but a comet none-the-less. Further astrometry is
> to calculate an orbit and once this is done the comet will be named.
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