It has been a while since I posted and I think one of our biggest pieces of new is that we are now regularly observing with HPF. Not only is this instrument being used to observe host stars for planets but there are astronomers who are using it to observe planetary nebulae looking for new elements being born in the deaths of stars just slightly heavier than our sun. This new instrument is easy to use, reliable and a great addition to the HET.
The other big news is that we now have 40 double barreled spectrographs installed within VIRUS. That means that we are now more than half way to have VIRUS fully populated.
We have two new openings at the Hobby-Eberly Telescope for telescope operators. One of our operators has moved on to be a technical manager for the new earth observatory being built by NASA at McDonald Observatory and the other is going to also work for NASA as a telescope operator on the Sofia flying observatory. While sad to see friends moving on it is great to know that we are hiring and training the best people! Maybe you know someone who might be our next telescope operator!? The add is below:
The Hobby-Eberly Telescope (HET) at the University of Texas at Austin, a state-of-the-art optical telescope facility located in the Davis Mountains of West Texas, has an opening for a Telescope Operator (TO). The TO is responsible for the operation of the telescope, dome and instruments for night-time observations while working with the Resident Astronomer to acquire data. The TO maintains the records and logbooks detailing the activities during the observing period. Local weather and facility conditions are monitored to insure adequate and safe observing conditions. Some day time responsibilities include: assisting the day staff in the resolution of technical problems and preparing the facility for night time operations.
Required qualifications: Bachelor’s degree in astronomy, computer science, engineering, or a related field; equivalent combination of relevant education and experience may be substituted as appropriate. Preferred qualifications: Completion of advanced courses leading towards a master’s degree in a STEM field and/or one or more years experience with operation of a 1+m telescope, understanding of observational astronomical terminology, experience with developing and adapting to changes in complex procedures for repetitive tasks, experience with quickly trouble shooting, documenting and working through faults in complex hardware and software systems, and experience working in a Linux or Unix environment through both command-line interfaces and GUIs. In addition, candidates should have the work ethic and drive to maximize the scientific output of the telescope. The work schedule will be determined with the Supervisor and will include nights and weekends.
For more information about the telescope and the McDonald Observatory visit http://www.as.utexas.edu/mcdonald/het/het.html. To view a complete job description, salary, benefits and application instructions visit http://utdirect.utexas.edu/apps/hr/jobs/nlogon/search/0/ and refer to job posting number: 18-07-06-01-4216. This position is security sensitive and therefore the offer is contingent upon successfully passing a criminal conviction background check. The University of Texas, as an equal opportunity/affirmative action employer, complies with all applicable federal and state laws regarding nondiscrimination and affirmative action.
This week we had a number of break through moments. Perhaps the most prominent is that after weeks of rewiring and adding new shielding we may finally be at a point where the VIRUS array is fairly stable. We have 36 VIRUS units installed (each unit is 2 spectrographs) so a total of 72 spectrographs up for the last 5 days.
Another big breakthrough is in observing automation. We have a piece of software called OCD (Observatory Conditions Decision tool) which monitors the metrology (seeing, transmission and sky brightness) from the telescope and decides if HETDEX observations can be made. If allowed it will also take over the control of the TCS and VIRUS instrument and start observing HETDEX targets with only brief pauses to get confirmation from the telescope operator that we are on the right setup star. Using this new tool we were able to observe a full night of HETDEX targets with a minimum of overhead (even a few targets with just 3 minute setup times). This is faster than the fastest resident astronomer and telescope operator pair working together. Congratulations to the HETDEX software team who traveled out from Germany to help us get it all working efficiently.
This week we continued with HPF and Laser Frequency Comb (LFC) commissioning. We made a lot forward progress in getting spectra with the comb and had our official “first light”. Below are a few pictures that might help visualize some of what transpired.
A slide that shows the basement of the HET where the HPF and LFC live.
A part of the spectrum from HPF which shows the very regular picket fense of emission lines generated from the LFC just below a stellar spectrum. The spectra are stacked up in an echellogram.
A very happy HPF team, NIST team and HET Night Operations team celebrate first spectrum on the sky. It took a large number of people to get this entire effort going but here are the lucky ones to see it live!
In the last week we have had a few updates for two of our instruments. For VIRUS we are up to 29 working spectrographs. We actually have several more units but some of the oldest and slightly mis-behaving units have been sent back to Austin for realignment and recommissioning. For HPF we are thrilled to announce that a NIST laser comb has been installed in the calibration room in the HET basement. This allows us to send a picket fence of spectral features through a separate fiber next to the science fibers. During the data reduction and analysis of the HPF spectra they can look at the position of these pickets and determine how the instrument might be subtly moving and correct for it. So far it seems like it is working great.
A brief advertisement before we get into this week’s news: One of our Resident Astronomers is retiring. If you are a PhD astronomer and interested in working on one of the largest optical telescopes in the world doing cutting edge research please consider applying: https://utdirect.utexas.edu/apps/hr/jobs/nlogon/171020014209
This week the big changes to the telescope have been the removal of the Prime Focus Instrument Platform (PFIP) work platform and the arrival of 3 more VIRUS units. The PFIP work platform, as the name suggests, allowed us to drop people off to work on the PFIP. We will still be able to work on the PFIP but now we have to do it from the JLG worker-lift. The work platform covered up a number of mirrors (about 10% of the light collecting area) as can be seen in the images below taken with our pupil viewing camera.
Two images of the HET pupil taken with our pupil viewing camera before (left) and after (right) the PFIP work platform was removed.
With the delivery of 3 more VIRUS units we now have 28 working VIRUS units or 56 spectrographs or more than 12,000 fibers on the sky!
The exciting news this week has been the arrival of the Habitable Planet Finder (HPF). This is the first of our new high resolution instruments and an instrument well suited to working in bright moon conditions. The HPF was designed and built by our Penn State partners and arrived on the 16th.
This instrument is designed for extremely high precision spectroscopy capable of detecting the reflex motion of stars as small earth sized planets go around them. To achieve that precision the instrument is housed in our temperature controlled basement at the HET inside a temperature controlled room inside a large temperature controlled vacuum chamber. All of these efforts allow them to control the temperature of the optics of the instrument at a level of 0.001 degrees Celsius.
After very carefully cleaning the enclosure that will house the vacuum chambered instrument the HPF team
was able to open their instrument and after a very through inspection proudly announced that they have just as many pieces of glass as they did in the assembly lab at Penn State (an optics joke). After a few final checks and the inclusion of their single moving part inside of the spectrograph they sealed up the vacuum chamber which, if things continue to go very well, may remain sealed for several years to come. The process of pumping the vacuum out of the large chamber took the rest of the weekend.
In the coming days and weeks the HPF team will monitor its stability, install the laser metrology system and get the systems ready for on-sky commissioning.
Quite an exhausting and exciting week at the HET!
This week we are pleased to announce that a new VIRUS unit was installed in side two of the VIRUS enclosure. This brings us to 22 VIRUS units or 44 spectrographs. We also took a little time in the last engineering run to add on some valves to the vacuum fittings which will allow us to cold pump on the VIRUS units which takes far less time to do than to warm up and then repump which was our older methodology. Keeping 22 VIRUS units going is starting to be a little easier but still takes a lot of management.
In addition to the work on VIRUS, we have also installed in the coherent fiber bundles for the HPF. These coherent fiber bundles will be used to setup stars on HPF science fibers. HPF will arrive in the coming weeks and we are very excited to get our first high resolution instrument on sky in the coming months.
We are in another 3 week science period but our big news this week is that we have been able to bring a few more VIRUS Units on-line which brings our total number of active units up to 21 units. Recall that a VIRUS unit is made up of 2 spectrographs so we now have 42 spectrographs on-line. These newest units are located in VIRUS enclosure 2 which means that we are now making use of both of the “saddle bags” which were installed at the HET as part of the Wide Field Upgrade. This makes the VIRUS closer to being ready for the main part of the HETDEX survey. As we add more Spectrograph units the system continues to get more complex with multiplexers and timing systems.
In some recent very clear nights we were able to observe 10 HETDEX shots (what we call a pointing for the survey) in a single night. This is a new record and our setup times are now typically below 5 minutes when moving from one shot to another. Further small milestones….
We have now observed one month out of four in the 2017-3 period. The month started off pretty slow with lots of bad weather in August but we have had some good clear nights. We are still conducting 7 days of engineering around full moon, at least until we get our first bright time instrument. So far we have collected 52.9 hours of charged time and completed 21.8% of the TAC allocated time. We have started collecting the first LRS2 Guaranteed Time Observations (GTO) allocated by the HET board for the instrument team as well as the first time allocated by the HET board for the HETDEX experiment. The latter includes time on well studied fields to make sure that our Lyman alpha emitters detected not really other types of emission sources and to better quantify our sensitivity/throughput.