An Improved Orbital Ephemeris for Cygnus X-1
  By accumulating all available radial velocity data and combining it with our own spectroscopy we present a new and improved ephemeris for Cygnus X-1 (V1357 Cygni/HDE226868). We initially calculate an orbital period of 5.599847+/-0.000018.days and then, by including the more recent radial velocities of LaSala et al. (1998) and Sowers et al.(1998) we refine this to 5.599829+/-0.000016 days. Using 27 years' worth of photometry, we also calculate a photometric period of 5.599836+/-0.000024 - remarkably similar to the spectroscopic one. 
C. Brocksopp (U Sussex), A.E. Tarasov (CrAO, Ukraine), V. M. Lyuty   (SAI, Russia), P. Roche (U Sussex)