Thank you Nick
Based on the orbital elements you provided here, this morning I was
able to image it and it was almost exactly at the predicted position.
Based on the first set, and what is given in this other link
https://neoexchange.lco.global/target/143872/
I had constructed 3 data sets for the software I use (Skymap), but the
first 2 gave wrong positions by several degrees.
By tonight I should be able to send what I have acquired. There are
several satellites to remove.
best wishes
Fabrizio

On Sun, 6 Apr 2025 12:57:27 +0100
  Nick James <ndj@nickdjames.com> wrote:
> Peter,
>
> Select SWAN25F on the PCCP here:
>
> https://www.minorplanetcenter.net/iau/NEO/pccp_tabular.html
>
> and you can generate an ephemeris for your location. It will be very
>accurate since the astrometric arc is now over 6 months.
>
> The latest elements using all of the astrometry on the PCCP are:
>
>    Perihelion 2025 May 1.15811 +/- 0.000324 TT =  3:47:41 (JD
>2460796.65811)
> Epoch 2025 Apr  6.0 TT = JDT 2460771.5   Earth MOID: 0.6280   Ju:
>0.4022
> M 359.99997631 +/- 0.0000030        Me: 0.0057   Sa: 0.5696
>     Auto-Find
> n   0.00000094 +/- 1.23e-7          Peri.  153.85086 +/- 0.00022
> a  10309.2556 +/- 910               Node   329.84397 +/- 0.00006
> e   0.9999676 +/- 2.83e-6           Incl.   90.37330 +/- 0.00036
> P1046745  H   11.31    G   0.15     U  2.1
> q 0.33341258 +/- 1.53e-6    Q 20618.1778 +/- 1902         (J2000
>ecliptic)
> 159 of 167 observations 2024 Sept. 3-2025 Apr. 6; mean residual
>0".45
>
> It is looking as if the comet is dynamically old (although with a
>very long period) so that is encouraging.
>
> Nick.
>
>
> On 06/04/2025 12:48, Peter Tickner - peter.tickner1472 at
>btinternet.com (via baa-comet list) wrote:
>> Hello Nick
>>
>> I looked and failed on those listed coordinates this morning. Partly
>>I think because it didn’t clear local obstructions until civil
>>twilight had started and partly looking through my f/10 14inch SCT
>>there wasn’t much room for error.
>>
>> Are there any updated coordinates?
>>
>> Regards,
>>
>> Peter
>>
>> Sent from my iPhone
>>
>>> On 6 Apr 2025, at 12:44, Nick James <ndj@nickdjames.com> wrote:
>>>
>>> I imaged the comet from Chelmsford again this morning and it was
>>>considerably brighter than yesterday. I get the following total
>>>magnitudes and coma diameters with comphot using a 51mm, f/4.9 refr.
>>>+ ASI2600MC. Green channel vs Gaia G DR3:
>>>
>>> 2025 April 5.157    9.6    2.3'
>>> 2025 April 6.150    8.0    3.8'
>>>
>>> Transparency was probably a bit better this morning but conditions
>>>and time were similar.
>>>
>>> Interesting behaviour so please observe this comet if you can and
>>>submit magnitude estimates. It is still on the PCCP so no official
>>>designation yet.
>>>
>>> Nick James
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>>
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