$@MID@$: 252
Date: Fri, 26 Apr 2019 23:17:07 +0000
Author: Alessandro for the drive team
Type: Telescope Operations
Category: Issues
Subject: drive tracking issue
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<p>We encountered a couple of issue with tracking</p>

<p>- When we tried to track on polaris coordinates (RA: 37.946143deg&nbsp; Dec: 89.264138&nbsp; AzOff=0.261&nbsp; ZdOff=-0.359) the telescope started to move toward the east relatively fast (roughly ~5deg in less than 1 min) while it was supposed to basically stay on place. Some ephemerides evaluation close to the north pole doesn&#39;t seems work</p>

<p>- After ~1h 10m of tracking on Arcturus (RA: 213.913315deg&nbsp; Dec 19.178249deg&nbsp; AzOff=0.261&nbsp; ZdOff=-0.359) we lost tracking. Apparently MOS did not crash (like previous time) so mistery remains. We simply re-start the tracking</p>

<p>- We do not fully understand how Az/Zd offset works.... we test the 2 offset Satoshi got with polaris....at the beginning the star was in the bottom left side of the WT....I added 1deg in azimuth and the star move to the center (so both in Az and zenith)...I go back to original values and the star stay in the same position...</p>
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