https://pfspipe.ipmu.jp/jira This file is an XML representation of an issue en-us 8.3.4 803005 13-09-2019 https://pfspipe.ipmu.jp/jira/browse/PIPE2D-1176 DRP 2-D Pipeline <p>While looking at spectra from the 2022-11 run I noticed that fibre 437 appears to have only had c. half of the sky flux removed.  For comparison, fibres 435 and 436 look OK.</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> fid target status spot norm mag 435 SCIENCE GOOD 1.000 0.755 15.75 436 SKY GOOD 1.000 1.019 NaN 437 SCIENCE GOOD 1.000 0.652 15.73 </pre> </div></div> PIPE2D-1176

Sky subtraction removes only c. 50% of the sky flux

Story Normal Done Done price rhl Wed, 1 Mar 2023 23:36:43 +0000 Thu, 27 Apr 2023 18:29:55 +0000 Thu, 27 Apr 2023 18:29:55 +0000 0 3 <p>It looks like this is due to fiberId=437 being near a black spot (distance = 0.77 mm) for the quartz observation used to construct the fiber profiles. I'll add the black spot correction to this part of the code too.</p> <p>Probably this is off topic (I'm sorry) ... At present, we are taking quarts/arc data at home position, at which some fiber suffer from the dot penumbra.. Is it better to move cobras to obscuration-free position? </p> <p>Unless there is a clear need to have the cobras at particular positions (e.g., repeating sky observations for some reason, hiding cobras behind black spots), all calibs should be taken with all the cobras completely un-obscured. The obscuration wastes photons and if it doesn't degrade the quality, at least makes the interpretation of the calibs more difficult.</p> <p>Applying the black spot correction to the quartz fixed the problem, as shown below.<br/> I'll fold this fix into <a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-1175" title="measure fiberProfiles from fewer swaths" class="issue-link" data-issue-key="PIPE2D-1175"><del>PIPE2D-1175</del></a>/<a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-907" title="Solve profiles for multiple fibers simultaneously" class="issue-link" data-issue-key="PIPE2D-907"><del>PIPE2D-907</del></a>.</p> <p><span class="image-wrap" style=""><img src="https://pfspipe.ipmu.jp/jira/secure/attachment/15574/15574_pipe2d-1176-fix.png" width="1000" style="border: 0px solid black" /></span></p> <p>Merged along with <a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-907" title="Solve profiles for multiple fibers simultaneously" class="issue-link" data-issue-key="PIPE2D-907"><del>PIPE2D-907</del></a>.</p> Development Rank 0|zzswcf: