CONICET | Buscador de Institutos y Recursos Humanos

Comet C/ 1857 D1 (d?Arrest) is one of a large number of comets with parabolic orbits. Given that there are sufficient observations of the comet, 299 in right ascension and 279 in declination, it proves possible to calculate a better orbit. The calculations are based on a 12th order predictor-corrector method. The comet?s orbit is highly elliptical, e = 0.99982 and, from calculated mean errors, statistically different from a parabola. The comet will not return for at least 44 000 years and thus represents no immediate NEO threat.ficient observations of the comet, 299 in right ascension and 279 in declination, it proves possible to calculate a better orbit. The calculations are based on a 12th order predictor-corrector method. The comet?s orbit is highly elliptical, e = 0.99982 and, from calculated mean errors, statistically different from a parabola. The comet will not return for at least 44 000 years and thus represents no immediate NEO threat.e = 0.99982 and, from calculated mean errors, statistically different from a parabola. The comet will not return for at least 44 000 years and thus represents no immediate NEO threat.