https://www.tdo.space/2017/10/18/c2017-o1-asassn1/
C/2017 O1 (ASASSN1)
Comet C/2017 O1 (ASASSN1) reached perihelion on October 14th, and be closest to Earth on October 18th (today), at a distance of about 75 million miles. The image above was captured and measured on October 17th, and consists of (40) 90 second exposures stacked on the comet in Astrometrica. The details are below.
Object:C/2017 O1 (ASASSN1)
Constellation: Camelopardalis
Telescope: ES127mm F7.5 APO Refractor
Mount: Paramount MX+
Camera: ATIK One 6.0
Filters: Astromiincs Luminance
Guide Scope: None
Guide Camera: None
Total Integration: 60 min.
Image Capture: SkyX camera addon
Guiding: None
Stacking/calibration: Astrometrica
Post Processing:None