1. Introduction
2. Running notes.
3. Observing strategy.
4. Reduction steps.

We are attempting to observe a young stellar object with ProEM on the McDonald 82". I went up to the 82" today (Aug07,2024) and saw the ProEM is mounted at the Cass focus. If it stays there (?) ths will means we should have a 1.6' x 1.6' field of view. Below I show a color composite made with PANSTARRS data and a crude finder chart from ZTF data that may be useful at the telescope.

A color composite from PANSTARRS imagery of Dracula's Chivito. I am unsure of the sky orientation. Position: 23:09:43.00 +67:23:40.0 J2000

Finding chart for Dracula's Chivito made with ZTF image. This was a 30 second image in the Gunn g filter. Image: ztf_20181108331701_001862_zg_c12_o_q1_sciimg.fits Position: 23:09:43.00 +67:23:40.0 J2000 Note that I did check the orientation of this image the morning of Feb09,2024. I used the original ZTF image and the WCS in that FITS image with ds9 to confirm that RA increases to the left (Esat) and Dec increases to the top (North).

Below is a table of ProEM specifications. I received this from Zach Vanderbosch (zvanderb@caltech.edu) a forme student of Don Winget (I think). Here is part of his email: Hi Steve, I'm not sure what all information you are looking for, but here is a table from my dissertation showing some of the camera's general specifications when attached at Cassegrain focus (see above). And hopefully the instructions for this are in the observing manual Mike sent, but you can extract individual FITS files from Lightfield's .spe file once data acquisition is complete, using some tools in the Lightfield GUI. Happy to help if there's any other info you need. Cheers, Zach

Summary of things learned on night of Aug08,2024 with Isaac Lopez, Judith Korth, and Jimi Lowrey.

% >cat /home/sco/Jimi/README.strategy
Hi Jimi and Judith and John (JJJ):

I wanted to summarize a few things we saw last and how they might 
shape the observing strategy for tonight. 

  1) The dark signal in ProEM is significant, and we should 
     procure calibration dark frames with 10, 20, and 30 second 
     integration times. 

  2) Once Dracula's Chivito (DC) is observed, you should check that 
     none of the stars is saturated. Pick the shortest integration 
     time that gives reasonable images (i.e. you can see the 
     asymmetric structure of DC). I suspect this will be at least 
     20 or 30 seconds based on the Palomar 30 second images I have 
     been playing with.  

  3) Take sets of images using the 10, 20, or 30 sec integration time 
     in g, r, i. It is important that each set have a folder name that 
     gives the filter name. If you think you may observe a few stars
     before DC is reachable, then maybe a target name might be good. 
     Finally a set number might be useful (e.g. the 4th set of g images 
     of DC). 

     EXAMPLE: 
     A folder name syntax might be:    DC_set2_g
     This would be the name for the second set of observations 
     of Dracula's Chivito in the g filter. 

  4) A good set of bias frames and (gri) flats will be needed. I'm 
     not sure why Isaac was using N=31 images, but this seems a 
     reasonable choice, so maybe we stick with that. I can reduce 
     the imageary using smaller subsets if we decide to do that 
     later. As I recall, for the dome flats Isacc used:
         Voltage=20 and 1sec exposure time for i
         Voltage=20 and 3sec exposure time for r
         Voltage=40 and 3sec exposure time for g   

   5) Prior to observing DC, you might have time to just observe any 
      field in (short) sets of gri that has a few stars (a dozen or 
      so would be great). The critical thing is the you record an 
      Ra,Dec for this field (whatever you call it). Thin we  can 
      always gather PANSTARRS gri photometry to derive a photometric 
      zeropint. 

Hope this does not sound too bossy! I really just wanted to stress that 
it will be very important to make clear which filter is being used for 
each folder you observe in. 

Let me know if you think I am missing any important points. 

Good luck, 
Steve 

P.S. Remember you can reach me at HET tonight with the VOIP 
     phones use 689. Also I will habe cell phone:  432-755-2782