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Comet C/2015 V2 Johnson
http://www.boltonastro.co.uk/forums/viewtopic.php?f=1&t=904
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Author:  rwilkinson [ Mon Oct 03, 2016 8:34 am ]
Post subject:  Comet C/2015 V2 Johnson

This comet is quite a difficult target, as it's very low in the North: only 17 degrees above the horizon at 9pm, and sinking lower through the night.
We had some haze low in the North during our recent trip to Norfolk, but on returning to Bolton it was rather clearer last night. And I found that when aiming to the North I can get away without using a LPR filter (which is certainly not the case when pointing South).
I just managed to get five exposures for stacking before the comet "set" behind my shed roof:
Attachment:
File comment: Comet Johnson on 2-Oct. 5x 90-sec using HX916 on 80mm f/4.6
c2015v2_2oct.png
c2015v2_2oct.png [ 370.48 KiB | Viewed 4770 times ]

If I get another chance, I'll start earlier in the twilight and set up my tripod as close to the opposite hedge, so that it can see more sky over the shed!

Author:  rwilkinson [ Tue Oct 04, 2016 7:30 am ]
Post subject:  Re: Comet C/2015 V2 Johnson

Two consecutive clear nights - we're getting spoiled!

Anyway, I did have another go at this comet last night, and setting up my tripod with two legs on the lawn and one in the flowerbed had it in sight for much longer:
Attachment:
File comment: Comet Johnson on 3-Oct. 50x 1-min using MX716 on C8 at f/3.3.
c2015v2_3oct.png
c2015v2_3oct.png [ 95.68 KiB | Viewed 4761 times ]

Author:  rwilkinson [ Tue Oct 11, 2016 7:02 am ]
Post subject:  Re: Comet C/2015 V2 Johnson

I'ts noticeably brighter this week, and last night with no star in the background the tail is clearer to see.
Attachment:
File comment: Comet Johnson on 10-Oct. 64x 1-min using MX716 with C8 at f/3.3
2015v2_10oct.png
2015v2_10oct.png [ 59.33 KiB | Viewed 4728 times ]

Author:  rwilkinson [ Wed Feb 22, 2017 7:50 pm ]
Post subject:  Re: Comet C/2015 V2 Johnson

This comet is still around, getting nearer and larger.
I got an image this morning using a remote telescope in New Mexico (at the time I was at the dentist having a filling repaired!):
Attachment:
File comment: Comet Johnson on 22-Feb. 3x 200-sec with 150mm f/7.3
c2015v2_22feb.png
c2015v2_22feb.png [ 538.11 KiB | Viewed 4255 times ]

It's a 10th magnitude object in Hercules, so would be an early-morning object from here if the skies ever cleared!

Author:  rwilkinson [ Wed Mar 15, 2017 8:23 am ]
Post subject:  Re: Comet C/2015 V2 Johnson

This comet is still in Hercules, so is now well-placed in the early morning sky - but there's bright Moonlight at the moment.
But although it was cloudy in Bolton (and indeed New Mexico!), I did manage to get an image from Tenerife, using the Open University's new COAST robotic telesope:
Attachment:
File comment: Comet Johnson on 15-Mar. 2x 120-sec with 14" SCT (COAST robotic telescope).
c2015v2_15mar.png
c2015v2_15mar.png [ 164.29 KiB | Viewed 4119 times ]
There will be more about this in our April newsletter

Author:  rwilkinson [ Wed Mar 22, 2017 4:44 pm ]
Post subject:  Re: Comet C/2015 V2 Johnson

I got another image back from Tenerife this morning:
Attachment:
File comment: Comet Johnson on 22-Mar. 6x 120s with 14" SCT.
c2015v2_22mar.png
c2015v2_22mar.png [ 177.41 KiB | Viewed 3990 times ]

Author:  rwilkinson [ Mon Apr 03, 2017 7:36 am ]
Post subject:  Re: Comet C/2015 V2 Johnson

I took advantage of another clear night to get an image of this comet:
Attachment:
File comment: Comet Johnson on 2-Apr. 27x 90-sec with MX716 on C8 at f/3.3.
c2015v2_2apr.png
c2015v2_2apr.png [ 178.42 KiB | Viewed 3862 times ]

I had to wait until nearly 11pm for it to rise above the trees to my East, but at least by then the Moon had set, and so the sky was darker.

Author:  rwilkinson [ Sat Apr 22, 2017 6:47 am ]
Post subject:  Re: Comet C/2015 V2 Johnson

This is one of the comets which I mentioned on Tuesday evening.
It's now in Hercules, so well-placed in our evening skies. Last night I caught it for a while after it had cleared the trees, and before the clouds rolled in:
Attachment:
File comment: Comet Johnson on 21-Apr. 13x 90-sec with MX716 on C8 at f/3.3
c2015v2_21apr.png
c2015v2_21apr.png [ 222.7 KiB | Viewed 3678 times ]

Author:  rwilkinson [ Sun Apr 23, 2017 8:33 am ]
Post subject:  Re: Comet C/2015 V2 Johnson

It was a little hazy last night, but at least the comet was clear of the trees by 10:30pm.
Attachment:
File comment: Comet Johnson on 22-Apr. 35x 80-sec with 16IC on 80ED at f/4.6
c2015v2_22apr.png
c2015v2_22apr.png [ 224.42 KiB | Viewed 3650 times ]

Author:  rwilkinson [ Wed Apr 26, 2017 11:26 am ]
Post subject:  Re: Comet C/2015 V2 Johnson

Last night I managed to see this comet (in the eyepiece, rather than on a CCD).
I was at a dark site in the Wye Valley, using a little 130P Newtonian on a Celestron NexStar Alt-Az mount.
My site has a good view to the East, so I could do a quick 2-star alignment on Vega and Arcturus soon after 10pm, and then linking SkySafariPlus on my Nexus7 tablet to the mount via BlueTooth, I sent it to the comet's position.
It was quite distinct in the eyepiece, a little smaller and fainter than the M51 Whirlpool Galaxy (although the latter was much higher in the sky).

I also had a good look for comet 41P: I found the surrounding stars OK, but couldn't make out the comet itself. It was lower in the sky, and I know that it's very diffuse.

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