Ho trovato questo:
http://arxiv.org/abs/1309.0586/Cita:
...We present an analysis for the sungrazing comet C/2012 S1 (ISON) to explore what rotational changes it could undergo during the upcoming perihelion passage where its perihelion distance will be ~2.7 solar radii. When close to the sun, barring a catastrophic disruption of the nucleus, the activity of ISON will be sufficiently strong to put the nucleus into a non-principal-axis rotational state and observable changes to the rotational period should also occur. Additional causes for rotational state changes near perihelion for ISON are tidal torques caused by the sun and the significant mass loss due to a number of mechanisms resulting in alterations to the moments of inertia of the nucleus.
Ma ancora e' sconosciuto, pare, il periodo di rotazione attuale della ISON.
http://www.isoncampaign.org/padma/on-the-wings-of-isonCita:
there still remain several major unknowns as far as I know: (i) rotation (period) of the nucleus
Qui anche
http://groups.yahoo.com/neo/groups/come ... pics/22868Cita:
I would be very interested in receiving reports of ISON spin rates post-perihelion, and I think observers would be justified in making an extra effort to obtain its rotation period, especially
as ISON gets closer to the Earth at the end of the month.
si domandano il periodo di rotazione attuale
Pero' mi interesserebbe sapere anche il periodo del trottolamento della coda, quello dovrebbe essere possibile calcolarlo dalle immagini, sapendo quando sono state riprese. Non riesco a trovare nulla in proposito...
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caotica a causa di effetti non gravitazionali.