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To gain a greater insight into the impending evolution of the physicalbehavior of comet C/2012 S1, its light curve and orbital properties arecompared with those for C/1962 C1 (Seki-Lines) and C/2002 O4 (Hoenig). Allthree are likely Oort Cloud comets. C/1962 C1 survived an encounter with theSun at less than 7 Rsun, while C/2002 O4 disintegrated near perihelion at 0.78AU from the Sun. Less than two months before its perihelion at 2.7 Rsun, C/2012S1 has a light curve that is much closer to C/1962 C1 than C/2002 O4. Itremains to be seen whether its motion is affected by nongravitationalperturbations. As new data on C/2012 S1 keep coming in, its continuingcomparison with the two comets will provide information on its health byupdating and adjusting its status. Strengths and weaknesses of this approachfor potential future applications will eventually be assessed.

Brightness and Orbital Motion Peculiarities of Comet C/2012 S1 (ISON): Comparison with Two Very Different Comets