Comet C/2022 E3 (ZTF) Velocity (Eric Coles (coles44))

Contains: Solar system body or event

Comet C/2022 E3 (ZTF) Velocity

This shows the velocity of the comet over three days of imaging. All these calculations were done by Mark Christensen of our Northwest Astronomy group. I take no credit, except knowing who to ask for help. Here is some additional commentary by Mark on these calculations.

Thanks Mark.

These are RADIAL rates. The values (here) are only good to four digits to the right of the decimal point and that is where all the difference lies. So a 10 to 20% error is likely. The earth-to-comet radial rate is much more believable, probably good to 5% or better. These are much more believable and are probably good to a couple of percent. The rate is increasing because the earth-comet radial separation is decreasing AND the comet is diving overhead downward towards the plane of the solar system.

These were done by simply loading up Cartes du Ciel with the comet download data. Then he generated a chart for each day/time combination and compared the star pattern near the images (that I sent to Mark). The results were good to an arc minute or so (the frames are 20X30 arc minutes, give or take one arc minute). The correlation was good. Then (Mark) could directly read off the RA and DEC from Cartes du Ciel along with the separation distances (in AUs good to four digits to the right of the decimal point). This was the limiting factor

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Status	Basic failed
Started	...
Astrometry.net job	7110775
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Comet C/2022 E3 (ZTF) Velocity

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