Quote:
Originally Posted by luigi
Thank you and sorry to ask but can you tell me what's the expected brightness based on the last data and how it will be seen from the South Hemisphere? Ty!
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MPEC doesn't supply a magnitude with the orbital elements.
JPL have M1= 6. M2= 10.5 in their "Comet physical & dynamic parameters" data, and these elements calculated using 55 observations for Jun 21 2011, and which differ a bit from MPEC.
$$SOE
2455733.500000000 = A.D. 2011-Jun-21 00:00:00.0000 (CT)
EC= 1.000465940853835E+00 QR= 3.027100489471750E-01 IN= 8.528173948630401E+01
OM= 6.558886142080000E+01 W = 3.335725096912954E+02 Tp= 2456362.424215855543
N = 5.951959991084002E-05 MA=-3.743331770195418E-02 TA= 2.027969705288987E+02
A =-6.496748384594785E+02 AD= 6.684586454211886E+91 PR= 1.157407291666667E+95
$$EOE
Feeding those numbers into CdC leads to an estimated mag 0.8 around March 22 2013 when it sets around sunset for most SH observers. The week or two before would be better located but less bright. eg on the 8th set is around 21:15.