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Hi,
I hereby reply to my own posting...
Perhaps I blundered myself in the way I misread Robert's note. I
apologise for that but I stick to my GSC comments!
With regard to bright sequences any system supporting H/T magnitudes
makes good sense. There are slight differences between the V and VT
magnitudes given in the H/T tables. In my experience the VT magnitudes
agree better to 'darkadapted' visual.
Regards,
Berto
>>> Berto Monard <lagmonar@csir.co.za> 09/02 8:02 AM >>>
Hi Fidusz,
If I read you correctly you are about to make a blunder. Guide 6 and a
number of other charting software use GSC magnitudes. These are
inferior magnitudes and should be avoided.
As with everything in such a case, exceptions prove the rule and you
will find star regions where GSC magnitudes do agree with proper
measures. They are rare though. When they are off, they are well
off!!!
The calibration standards for GSC are much better. You can find them
on the WWW under GSPC (P for Photometric).
Regards and don't make the blunder,
Berto Monard,
Pretoria
>>> "FIDRICH Robert (Fidusz)" <fidusz@zpok.hu> 09/01 4:43 PM >>>
Dear Mr. Kato,
In the spring I dowloaded all the H/T charts (HIPGIF and HIPGIF2) from
the
VSNET.
I thougth these chart were made using the Hipparchos and Tycho
catalgues,
but the sequences show large differences compared with the
VT mags or Hp mags. from the Guide6.
It seems these sequences were made with the original GSC magnitudes
that
have large scatter. Am I right?
For instance at the BZ And the closest 9th mag star were listed as
8.73
both in the VSNET H/T chart and the GSC, but 8.931 in the Tycho...
(Similar
case with the T Lyr...) Now I understand why I had so bad sequence for
the
T Lyr and some other variables. Changed the sequences to VT sequ the
situation is much better!
For the future I am afraid I shall use very careful those charts, and
I
shall prefer the VT mags. from the Guide6 and rewrite my sequences...
Regards,
Robert Fidrich
HAA/VSS
fidusz@zpok.hu
www.zpok.hu/albakor/fidusz
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