Observation by Nick James: C/2019 Y4 (ATLAS)

Uploaded by

Nick James

Observer

Nick James

Observed

2020 Apr 25 - 21:12

Uploaded

2020 Apr 26 - 10:46

Objects

C/2019 Y4 (ATLAS)

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Constellation

Camelopardalis

Field centre

RA: 05^h37^m
Dec: +62°16'
Position angle: +0°07'

Field size

0°32' × 0°24'

Equipment

C11 Edge HD + FLI6303

Exposure

44x60s

Location

Chelmsford, UK

Title

C/2019 Y4 (ATLAS)

About this image

April 25 provided yet another clear, transparent night in Chelmsford. The seeing was very good too. C/2019 Y4 is much more diffuse with the dust from the recent breakup spread down the tail. In the high res inset there is some hint of structure behind the well condensed fragment B.

I've been using FindOrb to play around with combining the astrometry of C/2019 Y4 (ATLAS) before the breakup and fragment B (C/2019 Y4-B) after it emerged on April 9. Without non-gravitational forces (NGFs) the mean residual of the linked data is quite large (0".98) with all the large errors in the frag B astrometry from April 9 onwards. Additon of NGFs gets the frag B residuals back to reasonable levels and the total mean residual down to 0".50 which is similar to the residuals in the pre-breakup data. Assuming fragment B survives, more astrometry will allow us to estimate the forces imparted on this fragment during the breakup.

Files associated with this observation

2019y4_20200425_2212_ndj.jpg (954.1 kB)

Like this image

Jeremy Shears, Jimmy Fraser, Andrew Paterson, Andy Wilson, Andrew Dumbleton, Peter Carson

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