Fourth preliminary catalogue of stars' right ascension observed with the photoelectric transit instrument (PPCP4).
On the photon counter data observed with Photoelectric Transit Instrument of Beijing Astronomical Observatory during the period from 1988 to 1990, corrections of right ascensions of 324 stars are given. The mean precision is 4.7 ms. The mean observational epoch is 1989.7. The relations of residuals with magnitudes and spectral types are discussed and given respectrively. Finally, the systematic corrections (PPCP4-FK4) are also analysed.
Publications of the Beijing Astronomical Observatory
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