Page History

We have looked into quantifying the delay between when a user requests an image with LMI, and when the shutter actually opens. Details can be found in the write up under the LMI link about the shutter delay. The bottom line is that:

1. The shutter opens 2.05 seconds later than the UTCSTART time given in the image  header.
2. The shutter closes 0.19 seconds earlier than the UTCEND time given in the image header.
3. Related - the shutter throw time in each direction is between roughly 0.1  and 0.2 seconds, meaning that there is also a temporal gradient across all  the images.
4. The exposure times are as recorded to within a few hundredths of a second, based on assessment of star trails in twilight flats.

An updated version of the NIHTS User Manual (v1.3 - 20181127) has been released and is available on the DCT confluence pages. Per the authors, "NIHTS User Manual v1.3 includes an update to the NIHTS calibrations procedure. We now advise observers to collect a full Long Arcs sequence at the beginning of the night, and Short Arcs (<2 min) at each target pointing to account for flexure in the instrument."

The 2018 summer shutdown is over. A variety of things were done. Most will be transparent to most observers. I mention here things that might cause changes you might notice. We repositioned the secondary mirror, and changed the default piston of the primary mirror. As a result the nominal focus offsets for all instruments will have changed. The TOs will have up to date new values. All the LMI filters were removed, examined and if needed cleaned. The dome following algorithm has been modified so that the dome will now make longer, less frequent moves. The occultation warning is being updated to account for this. Work continues on NIHTS and a new User Manual was recently released. We are in the process of rebuilding the pointing and optics models. Please include any observations related to pointing and image quality that strike you in your night reports. Thank you.

Tom has released an updated version of the DeVeny slit viewing camera GUI. Changes are documented and appear in the new release of the DeVeny Users Manual (v1.5), available below.

The DeVeny Spectrograph Reference and Operations Guide has been updated for the new release of the slitviewing camera GUI application. Version v1.5 (10 July 2018) of the manual is now available on the Observing at DCT confluence page.

Operational.

Summary

Web Page:

Manual: DeVeny_Manual_v1.5_10July18.pdf

Additional Information: DeVeny_Ops_Appendix.tar

Operational - PI instrument

Summary

Web Page: the instrument page at Gemini-N is mostly applicable and very informative

Manual:

Additional Information: DSSI is available part time at DCT. For information, contact E. Horch or G. van Belle.

Commissioning now/limited science operations

Summary

Web Page: EXPRES web page

Manual:

Additional Information: An overview of the instrument can be found in Jurgenson et al. 2016, Proc SPIE, 9908, 99086T  

On DCT through 30 April 2019

Summary

Web Page:  IGRINS wiki has a lot of information about IGRINS

Manual:

Additional Information: IGRINS will be available part of the year in 2016, 2017 and 2018. For information, contact L. Prato or G. Mace.

Operational, finishing commissioning.

Summary

Web Page:

Manual: NIHTS User Manual (v. 1.3 - 20181127)

Additional Information: Overview of NIHTS (2018 Proc. SPIE 10702, 107023E)

Coming soon.

Summary

Web Page:

Manual:

Additional Information: