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Observation by Alex Pratt: Video astrometry of comet C/2017 T2 (Pan...

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Alex Pratt

Observer

Alex Pratt

Observed

2020 Jun 01 - 22:00

Uploaded

2020 Jun 05 - 13:52

Objects

C/2017 T2 (PANSTARRS)

Equipment
  • C11 f/10 @ f/3.3
  • Watec 910 video camera
  • IOTA-VTI GPS time inserter
  • OccuRec (recording)
  • Tangra (reduction)
Exposure

Generally 0.64s

Location

Z92

Target name

Comet C/2017 T2 (PanSTARRS)

Title

Video astrometry of comet C/2017 T2 (PanSTARRS)

About this image

Comet C/2017 T2 (PanSTARRS) has been trundling through the northern constellations for several months and I've been doing astrometry of it since late October 2019. I've obtained 90 measures of its position on 32 nights. The comet reached perihelion on May 4 when it was 1.6 AU from the Sun.

I downloaded all astrometry for this period from the MPC website (including my own) and processed them with online Find_Orb to determine the RA and Dec residuals for each observation. The attached plots show the astrometric residuals (arcsec, in RA and Dec) for all CCD measurements (in grey) and video measurements from my location, Z92 (in black). It's interesting to see the comet's movement in recent weeks, meandering around its mean nominal position.

C/2017 T2 is now nicely located above the Plough asterism and I hope to measure it for some weeks yet.

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