[BAA Comets] C/2015 V2 - increase in magnitude

[Juan Jose Gonzalez]

Tony, Nick, Denis, and all :


I can confirm the possible outburst :

C/2015 ER61 (PANSTARRS):
2017 Apr. 4.17 UT: m1=7.4, Dia.=4', DC=6, 10x50B.
[ Possible outburst. The comet shows a higher DC,
appearing significantly brighter than expected
in comparison with my previous Apr. 1.18 observation.
Sidgwick method. Tycho-2 comparison stars.
SQM : 21.5 at zenith. Altitude: 9 deg. In 20 cm SCT(77x):
m2=10.5: (Tycho-2). Dust tail 0.2-deg in PA 260 deg.
Mountain  location, very clear sky.].


Best regards and clear skies,



Juan Jose Gonzalez


-------------------------------------------------------------------------------------


On 04/04/2017 Tony Angel wrote :

> Sorry all.  I had been awake most of the night .  Brain was a little fuddled. Although I had observed C2015 V2 in the middle of the night, it was C2015 ER61 – my last observation of the session – that I was referring too.
> Dennin. Yes I will send images shortly after a cat nap. I had hoped to have gone to bed after I shut up this morning, but by the time I had finished answering various queries it was time to be dragged away to the shops, from which I have just got back.
>
> Meanwhile Jakub Cerny worked on two days stacked images that I had sent to him and he has returned his results based on my images:
>
> “I select R magnitudes because in R your ccd chip is most sensitive, it shows 10.0 mag yesterday total magnitude and 8.4 mag today”
>
> Meanwhile Part II.
>
> Before I went out, after mentioning to Rolando Ligustri about the increase he told me that NM was cloudy. When I got back there was a message from him that NM was now clear. Hopefully he will be imaging it.
>
> Best Wishes,
>
> Tony.
>
> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
>
> From: Nick James<mailto:ndj at nickdjames.com>
> Sent: 04 April 2017 13:31
> To: denis buczynski<mailto:buczynski8166 at btinternet.com>; BAA Comets discussion list<mailto:comets-disc at lists.britastro.org>
> Subject: Re: [BAA Comets] C/2015 V2 - increase in magnitude
>
> Ooops. I've just noticed that your subject says 2015 V2 but your
> observations are of 2015 ER61.
>
> Ignore my previous email...
>
> Nick.
>
>
> On 04/04/2017 11:06, denis buczynski wrote:
>> Hi Tony,The comet has developed and ion tail during the past few days, so there is something going on in terms of increased activity within the comet. Do your latest images show an enhancement of the ion tail?Best wishesDenis
>>
>>
>>         From: Tony Angel <tony_angel_uk at hotmail.com>
>>    To: BAA Comets discussion list <comets-disc at lists.britastro.org>
>>    Sent: Tuesday, 4 April 2017, 8:02
>>    Subject: [BAA Comets] C/2015 V2 - increase in magnitude
>>
>> Greetings,
>>
>>
>> In the past 24 hours this comet has increased in magnitude
>>
>> 1.5 mag increase in 24 hours
>> NET Gaia DR1
>> Average
>> CK15E61R KC2017 04 03.18593 20 40 36.83 -15 37 40.0 11.46N Z85
>> CK15E61R KC2017 04 04.19440 20 45 41.70 -15 12 11.6  9.97N Z85
>>
>> Best Wishes,
>>
>> Tony.
>>
>>
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