The catalogue of positions and stellar magnitudes in the
R system of 700 stars in Hyades. Measurements, astrometric 
and photographic plates, by Andruk V.N., Parusimov V.G., 
Dudnik T.B., Ostrovskij D.E.


Abstract. 
A catalogue of photographic magnitudes in the Johnson R 
system which include 700 stars was created as a photometric 
part in the program MEGA. Star positions are streamlined to 
the ACT catalogue system. This catalogue was reseived on the 
basis of two photographic plates measured by the automatic 
digital two-coordinate microphotometer. The images are 
processed with MIDAS/ROMAFOT program. Astronegatives of the 
sky area in Hyades were exposed with Maksutov teleskope 
(F=1200 mm, D=350 mm) of Engelgardt Astronomical Observatory 
in Kazan, Russia. The software, allowing to create catalogues 
of star positions and magnitudes on the basis of digital 
processing of already photometred images, was developed.  The 
sky area of the scanned photographic plates are 3.3x2.5 
degrees. Limit permeate forse of teleskope (R=13 mag) is 
reached with spacial resolution 16x16 mkm (emulsion ORWO ZP-3 
with 40 minutes of exposition). The rms errors of star 
magnitudes of coordinates are 0.12 mag and 0.65 arcsec, 
respectively. Work is made in the MAO National Academy of 
Sciences of Ukraine.  The catalogue of positions and stellar 
magnitudes in the Johnson R system of 724 stars in Hyades is 
presented in file hyadesr.dat, where  column 1: gives the 
number of the star in the catalogue, columns 2 and 4: its 
right ascension and declination for epoch J2000., columns 3 
and 5: its error of coordinates; columns 6 and 7: the R 
magnitude and its error, column 8: the number of measurements 
for the star.          


Byte to byte description of the MEGA photoelectric catalog
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Column  Bytes Format Design    Units          Remarks
_______________________________________________________________________________
  1     1-10   i10 R.A.(1950) h,m,s*.001 Right Ascension of the observation
				         epoch and equinox 1950.0;
				         10-digital number,
                                         digitals 2,3 are hour,
			                 digitals 4,5 are minute,
				         digitals 6-10 are second multiplated
                                         by 1000.
  2     11-20  i10 DEC.(1950) o,',"*.01  Declination of the observation
				         epoch and equinox 1950.0;
				         10-digital number,
                                         digital 2 is sign,
					 digitals 3,4 are degree,
				         digitals 5,6 are minute,
				         digitals 7-10 are second multiplated
                                         by 100.
  3     21-27   f7.3  U           mag    Stellar magnitude in U system.
				         is equal to --, if data are absent.
  4     28-33   f6.3 err(U)       mag    R.M.S. errors of U magnitude.        
  5     34-40   f7.3  B           mag    Stellar magnitude in B system.
				         is equal to --, if data are absent.
  6     41-46   f6.3 err(B)       mag    R.M.S. errors of B magnitude.          
  7     47-54   f8.3  V           mag    Stellar magnitude in V system.
				         is equal to --, if data are absent.
  8     55-60   f6.3 err(V)       mag    R.M.S. errors of V magnitude.          
  9     61-67   f7.3  R           mag    Stellar magnitude in R system.
				         is equal to --, if data are absent.
 10     68-73   f6.3 err(R)       mag    R.M.S. errors of R magnitude.          
 11     74-77   i4     n                 Number of measurements.
 12     78-80   i3     k                 Number of nights.
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Data (36.4Kb) 
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