GZ32JPL23ring occults 4U 185-75921 on 2017 May 20
Jose L. Ortiz asked the amateurs for an observation of a 800km TNO
in the night from Friday to Saturday the 20.May 2017.
The star was 13 mag and no problem even for small telescopes.
The minor planet has a possible ring similar like Chariklo:
https://en.wikipedia.org/wiki/10199_Chariklo
The weather prediction saw a 50% chance for Munich.
The sky became clear after midnight and
the conditions were
perfect.
It was possible to use 2 telescopes. The 80cm Cassegrain was used with
the Watec 120N. The integration was rised to 0,64s to make
shure to get a good Signal to Noise Ratio (SNR). Several videos are
made.
The biggest video was made between 1:24 and 1:44 UT.
The Position im Munich was:
+48:07:18.8 n.B
11:36:25.4 ö.L
at 611m
For the Photometry I used the software Tangra. Inspide of the perfect
conditions in Munich there was nothing significant to see.
The additional Meade Schmidt-Cassegrain was used with a Atik 314L.
Here was the exposure-time 0,4s. At Bin6 the Atik has a readout-time of
0,25s. So both telescopes have a framerate near 1,6fps.
The Photometry of the Atik-pictures was made with the software Miniwin.
Also here is nothing to see.
The path went some hundret
kilometers to the south.
Spain an Greece were positive.
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