Maria Mitchell Observatory,
In AAVSO Abstracts, 19
October 1968, Jean Jackson pointed out that the period of V COm is changing.
Since then additional observations have been acquired from Harvard, Nantucket,
and Yale plates, and more published observations have been compiled. All this
material was turned over to Janet Johnston for re-evaluation of the period. Her
results, based on some 450 miscellaneous observations, mainly between JD 18443
and 42188, indicate that he observed phases, 0, are satisfactorily represented
by the relation, ?????. It is noted that he basic period, P?, agrees with the
period as given in the Genral Catalogue of Variable Stars. The correction term
implies a progressive shortening ofthe period (dP/ dn = 2kP?) amounting to
1.6x10? day/cycle. This is reasonably consistent with the difference between
the basic periods given in the GCVS and by Miss Jackman, which refer to
different basic epochs, JD?.