Discovered by Zaccheus Daniel
Discovery date December 7, 1909
P/1909 X1,
P/1937 B1
Orbital characteristics A
Epoch June 25, 2000
Perihelion 2.1572385 AU
Semi-major axis 4.0216611 AU
Eccentricity 0.4635952
Orbital period 8.065 a
Inclination 22.41°
Last perihelion July 20, 2008
Next perihelion August 22, 2016[1][2]

Comet Daniel is a periodic comet in the solar system discovered by Zaccheus Daniel (Halsted Observatory, Princeton University, New Jersey, USA) on December 7, 1909 estimated as magnitude 9.

Following its discovery, the returns for 1916, 1923, and 1930 were predicted but on each occasion it was not recovered.

The 1937 return was recovered by Shin-ichi Shimizu (Simada, Japan) on January 31 after a calculation of the comet's orbit by Hidewo Hirose (Tokyo, Japan) after he took calculations for the 1923 return done by Alexander D. Dubiago and took into account perturbations from Jupiter.

All returns apart from 1957 and 1971 have been recovered.

Repeated close encounters with Jupiter have increased this comet's orbital period steadily since it was first discovered, it will likely increase again to 8.29 years when it next encounters Jupiter on December 2, 2018.

The comet nucleus is estimated to be 2.6 kilometers in diameter.[3]

At some point between 2009 January 11 and 30 the comet underwent an outburst of around 3 magnitudes, brightening from 18th to 15th magnitude.[4]


  1. ^ Patrick Rocher (April 29, 2009). "Note number : 0125 P/Daniel : 33P". Institut de mécanique céleste et de calcul des éphémérides. Retrieved 2012-02-19. 
  2. ^ 33P past, present and future orbital elements
  3. ^ "JPL Small-Body Database Browser: 33P/Daniel". Jet Propulsion Laboratory. Retrieved 2010-02-26. 2009-04-24 last obs 
  4. ^ "BAA Comet Section : Periodic Comets". Jonathan Shanklin. 2011-12-18. Retrieved 2012-10-26. 

External links

Periodic comets (by number)
32P/Comas Solá
33P/Daniel Next

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