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Estimating Dimensions of the Nucleus of Great September Comet of 1882 from Motions of Its Fragments
Zdenek Sekanina
Data on perihelion fragmentation of the Great September Comet of 1882 (C/1882 R1), a prominent member of the Kreutz sungrazer system, are employed to estimate the size of the nucle…
The End of an Era in Cometary Astronomy: The Deceleration of Comet Encke
Zdenek Sekanina
It is noted that effective very recently, the orbital motion of Encke's comet has become affected by a very slight nongravitational deceleration. Soon after J. F. Encke established…
On the Detection and Distribution of Nongravitational Accelerations in the Motions of Long-Period Comets
Zdenek Sekanina
Even though the orbital motions of most long-period comets are found to comply with the gravitational law, a rapidly increasing minority of these objects is found to display detect…
Enigmatic Nebulous Companions to the Great September Comet of 1882 As SOHO-Like Kreutz Sungrazers Caught in Terminal Outburst
Zdenek Sekanina
I investigate the nature of the transient nebulous companions to the sungrazing comet C/1882 R1, known as the Great September Comet. The features were located several degrees to th…
New Model for the Kreutz Sungrazer System: Contact-Binary Parent and Upgraded Classification of Discrete Fragment Populations
Zdenek Sekanina
The structure of the Kreutz system of sungrazing comets is shown to be much more complex than formerly believed. Marsden's (1989) division into three subgroups (I, II, IIa) is now…