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.
Bite to bite description of the MEGA photoelectric catalog
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Column Bytes Format Design Units Remarks
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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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