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Elara (Jupiter-VII)

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About this observation
Observer
Paul Leyland
Time of observation
20/06/2019 - 02:00
Object
Elara (Jupiter-VII)
Observing location
Tacande Observatory
Equipment
0.4m Dilworth-Relay
SBIG-8 with AO-7 autoguider
No filter
Exposure
1x10s+ 10x60s around 02:45UT and 18x30s around 04:05UT
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The right image shows Elara at 02:42 UT; it's a stack of 11 images centred on the satellite. By 04:04UT Elara had moved very close to the V=16.45 star UCAC4 336-092391 and wasn't resolved. However, the addition V=16.6 Elara approximately doubled the brightness and this effect is easily visible when one compares the appearance of the line of four relatively bright stars in each image. The faint object visible in the left image at the position where Elara had been almost two hours earlier is a real star. It is 4115201409792784512 in the Gaia-DR2 catalogue where it is recorded as being of magnitude 18.37. Precision astrometry in such a crowded field would be challenging.

My thanks to Nick James who taught me to make two sets of tracked stacks. It was fortunate that in this instance the images fell naturally into two sets each of short duration and well separated in time.

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