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[vsnet-chat 5811] Re: [AAVSO-DIS] survey, pixy etc



Re: [vsnet-chat 5809] Re: [AAVSO-DIS] survey, pixy etc

> Of course you have to do that!
> 
> In the MISAO Project activity, I have been spending so much time to
> check measured magnitude of variable stars before reporting to
> VSNET confirming the images visually using the PIXY System 2's
> graphical user interface.
> 
> There are so many reasons why the measure magnitude becomes
> erroneous. Maybe it is at the edge. Maybe identification is
> wrong. Maybe it is blended with a nearby stars. Maybe it is on the
> dark spot. Maybe the zero point could not be set properly. And so on.
> 
> Actually we the MISAO Project has millions of unreported magnitude
> data in my database, but only several thousands of them have been
> reported officially to VSNET. Because it takes so much time to check
> them.

   If a user of the data is going to make a statistical apporoach, such
observations may be worth reporting.  (e.g. If one allows a situation
that 90% of MISAO project data are correct to 0.1-0.2 mag, 5% may be in
error to 1 mag, 5% may be totally in error, or something like that).

   Au automatic warning on unusually scattered observations (as pointed
out by Sebastian), discordant observations before reporting would certainly
reduce such errors. (Won't you equip such a function in PIXY, Yoshida-san?)

   My feeling is that not all visual observations have been equally
throughly checked.  Even compared to traditional visual observations,
the error rate in MISAO data may be already lower, although there may
be surprising ones like a dramatic fading of Rigel ;-).

Regards,
Taichi Kato

PS. Before incoporating Maciej's data to the VSNET database, I personally
    tried to check some of these inconsistencies.  Attached is a list of
    warnings.  The warnings were based a comparison with the nearest
    existing observation (mostly visual).  There are a lot of false postive
    and negatives, and no checks were done for the objects reported
    for the first time.  Sorry the date is in JST (= UT + 9h).

# I wonder why PIXY reported <10.48 for NU Ori...

mag warning: CMASX 200212253155 6.65C RMQ
mag warning: CMAUZ 200212253156 9.87C RMQ
mag warning: CMAVY 200212253205 6.54C RMQ
mag warning: CMIS 200212253221 6.23C RMQ
mag warning: CMIU 200212253221 7.58C RMQ
mag warning: CMIUX 200212261036 7.17C RMQ
mag warning: CMIV 200212253222 6.58C RMQ
mag warning: CMIZZ 200212253221 8.65C RMQ
mag warning: CNCRT 200212261017 4.76C RMQ
mag warning: HYAT 200212261007 6.72C RMQ
mag warning: LEOR 200212261020 2.21C RMQ
mag warning: LEORY 200212261020 9.88C RMQ
mag warning: LEPR 200212253200 7.16C RMQ
mag warning: LEPRX 200212253229 3.45C RMQ
mag warning: MONAX 200212253224 5.80C RMQ
mag warning: MONBS 200212253149 8.69C RMQ
mag warning: MONBX 200212253150 11.16C RMQ
mag warning: MONBX 200212253150 11.16C RMQ
mag warning: MONEL 200212253147 <10.19C RMQ
mag warning: MONV 200212253213 8.57C RMQ
mag warning: MONV636 200212253146 6.71C RMQ
mag warning: NSV01842 200212253229 5.52C RMQ
mag warning: NSV02427 200212253236 10.69C RMQ
mag warning: NSV02469 200212253232 10.25C RMQ
mag warning: NSV02476 200212253143 6.29C RMQ
mag warning: NSV04412 200212261009 8.80C RMQ
mag warning: NSV04412 200212261023 7.78C RMQ
mag warning: NSV04439 200212261027 11.07C RMQ
mag warning: NSV04550 200212261035 8.92C RMQ
mag warning: NSV16592 200212253236 11.32C RMQ
mag warning: NSV17437 200212253155 9.60C RMQ
mag warning: NSV17620 200212253206 9.46C RMQ
mag warning: NSV18148 200212261027 8.71C RMQ
mag warning: ORIAI 200212253232 6.43C RMQ
mag warning: ORIBO 200212253232 <10.68C RMQ
mag warning: ORICO 200212253226 7.85C RMQ
mag warning: ORIIV 200212253142 7.75C RMQ
mag warning: ORILM 200212253142 11.21C RMQ
mag warning: ORILT 200212253232 <10.68C RMQ
mag warning: ORINU 200212253142 <10.48C RMQ
mag warning: ORIS 200212253142 6.36C RMQ
mag warning: ORITT 200212253232 <10.68C RMQ
mag warning: ORITU 200212253142 2.28C RMQ
mag warning: ORIV1030 200212253140 3.42C RMQ
mag warning: ORIV1175 200212253142 11.22C RMQ
mag warning: ORIV534 200212253232 <10.68C RMQ
mag warning: ORIV534 200212253238 7.16C RMQ
mag warning: ORIV947 200212253236 7.29C RMQ

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