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Three views of comet 174P/Echeclus

Posted: Sat Dec 16, 2017 11:20 am
by rwilkinson
This comet seems unusually prone to outbursts, where it suddenly becomes much brighter than usual (probably due to outgassing of volatiles). This can be seen from the light-curve on Seiichi Yoshida's web-page:


This week, after reading that it had flared up again, I managed to get an image from New Mexico:
The comet from New Mexico on the morning of 15-Dec (our time). 2x 170-sec with 250mm f/3.4 refractor.
174p_15dec.png (226.84 KiB) Viewed 2162 times
And then as it's high in our evening sky (in Pisces), I was also able to catch it from Bolton:
The comet from Bolton that same evening. 31x 90-sec with MX716 on C8 at f/3.3.
174p_15dec.png (209 KiB) Viewed 2166 times
This comet is moving so slowly across the sky that it appears against the same star-field in both images, taken around twelve hours apart.
And I'm gratified to see that I've picked up a similar number of the background stars from Bolton as I did from New Mexico (albeit with an integrated exposure time eight times longer).

Then a couple of hours later, the request which I'd placed on the COAST job-queue two days before ran too:
The comet later the same evening, this time from Tenerife. 3x 150-sec using C14 at f/10.
174p_15dec.png (137.77 KiB) Viewed 2162 times

Re: Comet 174P/Echeclus

Posted: Wed Dec 27, 2017 11:36 am
by rwilkinson
A couple of weeks later it appears to have got larger but more diffuse:
Comet 174P on 26-Dec. 3x 150-sec with C14 f/10.
174p_26dec.png (214.7 KiB) Viewed 2077 times

Re: Three views of comet 174P/Echeclus

Posted: Thu Jan 11, 2018 9:36 pm
by rwilkinson
That "outburst" material from a few weeks back still seems to be spreading, and so becoming even fainter:
Comet 174P on 10-Jan. 3x 150-sec with C14 at f/10.
174p_10jan.png (378.29 KiB) Viewed 2007 times