Observation by Nick James: Comet 12P in outburst

Uploaded by

Nick James

Observer

Nick James

Observed

2023 Jul 22 - 22:36

Uploaded

2023 Jul 23 - 06:27

Objects

12P Pons-Brooks

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Constellation

Draco

Field centre

RA: 18^h14^m
Dec: +55°49'
Position angle: -1°23'

Field size

0°13' × 0°09'

Equipment

Alnitak 0.45-m, f/6.6 CDK + IMX455

Exposure

6x120s V-band

Location

Alnitak Observatory, Spain

Target name

12P/Pons-Brooks

Title

Comet 12P in outburst

About this image

This image was taken 21.15 hours after the previous one and the coma has expanded from 26 to 36 arcsec diameter. That is a change in radius of 0.24 arcsec/hour. The current distance of 12P is 3.5 au which is 530 million km which is around 2,500 km per arcsec so the expansion velocity looks to be around 160 m/s. The total magnitude is constant in an expanding aperture which is what would be expected from a large impulsive release of material into the coma.

Files associated with this observation

12p_20230722_223658_ndj.jpg (868.3 kB)

Like this image

Dawson, Mike Harlow, Peter Carson

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