Observation by David Swan: C/2017 S3: significant dimming

Uploaded by

David Swan

Observer

David Swan

Observed

2018 Jul 20 - 21:54

Uploaded

2018 Jul 21 - 19:50

Objects

C/2017 S3 (PANSTARRS)

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Constellation

Auriga

Field centre

RA: 05^h14^m
Dec: +54°20'
Position angle: -17°59'

Field size

0°25' × 0°17'

Equipment

200mm SCT @ f/6.3
ASI183MM
Baader UV+IR cut
FireCapture, DeepSkyStacker and Maxim DL

Exposure

10 x 10s

Location

Tynemouth, UK

Target name

C/2017 S3

Title

C/2017 S3: significant dimming

About this image

Transparency wasn't wonderful, but I managed to snatch 10 frames in a short clear-ish spell. My determination of the comet having dimmed significantly has now been confirmed by others including Nick James.

Time stated is UT.

Comphot:

10x10 20x20 30x30 40x40 50x50 60x60

12.51 11.56 11.07 10.74 10.47 10.26 # Counts

12.51 11.61 11.12 10.78 10.51 10.30 # Median annuli

Total integrated magnitude: 9.19 (radius 112.8 arcsec)

Files associated with this observation

2017s3_20180720_225340_dswan.png (837.4 kB)

Like this image

Jeremy Shears, Nick James, Neil Morrison, Ray Emery, Callum Potter, Andy Wilson, Peter Carson, Dean Ashton, Chris Hooker

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