THE ORBIT OF THE COMET 1914-II-KRITZINGER - NONGRAVITATIONAL EFFECTS IN THE COMET MOTION

Using all available observations of the one-apparition comet 1914 II K ritzinger we show that the gravitational solution makes (O - C) residu als non-randomly distributed. We therefore apply three other models of the comet motion: (i) with a displacement of the photometric center f rom the center of mass of the comet along the radius vector, (ii) with a change in the velocity vector due to a single outburst of the comet , and (iii) with Marsden's standard nongravitational parameters A(1), A(2), A(3). It turns out that models (ii) and (iii) fit the observatio ns of comet 1914 II Kritzinger equally well and give the same mean res idual and the same (O - C) residual distributions. In consequence, fro m the quality of the fit we are not able to distinguish which of the t wo models is better. It is suspected that for some comets undergoing a n outburst, the model (ii) can be an alternative to, usually applied, Marsden's model (iii).