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[vsnet-chat 2313] Hipparcos and Tych photometry

Dear Friends, 

...sorry for my english, but I have a questions. 
Question about Hipparcos and Tycho photometry. 
I found for example this:

>
Main Mission Variability

Observed magnitude at maximum and minimum luminosities:
Mag at max, Hp: 6.91 (5th percentile)
Mag at min, Hp: 7.16 (95th percentile)

Variability period from Hipparcos observations: 41.60 days
<

My question is: is it V-system magnitude ?
Second question is: Using Tycho V-system (if) too ?


Best regards, Maciej


| Maciej Reszelski                                         
| Al. 1-go Maja 29/4                                       
| 64500 Szamotuly                                          
| Poland                                                   
|                                                          
| e-mail:                                                  
| macres@poczta.onet.pl         (Home)                     
| macres@hoth.amu.edu.pl        (Institute of Physics)     
| macres@juno.astro.amu.edu.pl  (Poznan Univ. Observatory) 
| www:                                                     
| Observations: http://republika.pl/macres            
| Homepage:     http://juno.astro.amu.edu.pl/~macres

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