Observation by Nick James: Expansion of 174P coma

Uploaded by

Nick James

Observer

Nick James

Observed

2017 Dec 13 - 03:00

Uploaded

2017 Dec 13 - 09:35

Objects

174P Echeclus (60558)

Equipment

iTelescope T24

Exposure

5x60s and 5x120s

Location

iTelescope New Mexico

Target name

174P

Title

Expansion of 174P coma

About this image

These images with the same instrument, same scale and both processed in the same way show the expansion of the coma of 174P following its outburst. The coma has grown from a diameter of 23 arcsec yesterday to 30 arcsec this morning. The comet is currently 6.4 au away and so 30 arcsec corresponds to a physical diameter of 140,000 km and an expansion of 7 arsec corresponds to an expansion velocity of around 170 m/s.

Files associated with this observation

174p_comparison.jpg (330.1 kB)

Like this image

Ray Emery, Mr Leonard Entwisle, David Swan, Dawson, Peter Carson

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