Comets - 33P/Daniel - 0033P
Type Periodic Perihelion Date 22 August 2016 Perihelion Distance (q) 2.2 Aphelion Distance (Q) 5.9 Period (Years)   8.1 Eccentricity (e)   0.46 Inclination (i)   22.4 Click for NASA orbit diagram
Hills Observatory: 1 January 2013 to 6 May 2018
The comet was discovered by Zaccheus Daniel (Halsted Observatory, Princeton University, New Jersey, USA) on 7 December 1909. He said the comet was about 9th magnitude and was visible in a small telescope, with a nucleus of magnitude 13.  The comet had already passed perihelion when discovered and was actually found on the day of its closest approach to Earth. Therefore, it was most likely near its maximum brightness when found. Nevertheless, magnitude estimates of 9.2 to 9.5 were reported by other observers up until mid-December and this faded to 10-11 by mid-January 1910. Despite a careful examination of the orbit of this comet by Alexander D. Dubiago following its discovery apparition, searches during the predicted returns of 1916, 1923, and 1930, revealed nothing. During the summer of 1936, S. Kanda suggested to Hidewo Hirose (Tokyo, Japan) that a search ephemeris for the 1937 apparition should be computed. Hirose took Dubiago's orbit for the unobserved 1923 apparition and computed the perturbations from Jupiter for the period of 1923 to 1936. He noted that the upcoming return of 1937 would be favorable for recovery, and predicted a perihelion date of 28 January 1937. The comet was recovered by Shin-ichi Shimizu (Simada, Japan) with an 80-mm astrograph on 31 January 1937. The comet was found after an assiduous search around the positions predicted by Hirose. Shimizu said it appeared as a 13th magnitude diffuse object, without a nucleus. The comet will approach 1.39 AU from Jupiter on 2 December 2018, increasesing its perihelion distance from 2.16 AU to 2.24 AU and its orbital period from 8.07 to 8.29 years. Date 10x10 mag Error Kphot mag Coma ' 27-Dec-16 18.39 0.05 15.3 0.2 21-Jan-17 18.61 0.09 17.0 0.2 03-Feb-17 18.38 0.06 15.5 0.2 18-Feb-17 18.67 0.13 16.0 0.2