HET Beginning-Trimester Report
Second Period of 2020
April 1 - July 31
This report is primarily to give updates to PIs
on recent changes/improvements and to summarize the determination
of time allocations for the 20-2 trimester.
Updates on recent changes/improvements:
- Daily HPF data reduction pipeline,
Goldilocks
- Updated night report reader and improved
guider metrology data
Goldilocks daily HPF data
reduction
Goldilocks is a an automatic
pipeline for the HPF instrument at the HET. The pipeline
reduces the previous night's data the following morning at
11:30am (length of reduction is 1-2 hours) and provides
users with reduced spectra to either adjust their
program/targets or quickly turn observations into a
scientific publication. Although the primary goal of the
software is to quickly reduce the HPF data products, we
still aim to provide the highest quality reductions possible
for both spectral and radial velocity analysis. More
details about the algorithms and products are found
here:
For
consistency within a program or across programs, if you
would like older data reduced, please contact Greg Zeimann,
grzeimann@gmail.com.
The pipeline is currently working backwards in time to
reduce a large portion of the already acquired HPF data, but
it may not have gotten to your specific observations quite
yet.
Also,
given the vast amount of data produced by the instrument, it
is not always easy to catch issues or times when the
pipeline did not perform as designed. Again, if you
notice an issue feel free to contact Greg Zeimann.
Finally, your "new data" emails for HPF
observations will include the path to your reduced data on TACC.
Please try this out and let us know if you have any problems or
questions.
Updated night report reader and
improved guider metrology data
In
response to user requests we have updated the HET night report
reader available publicly at the following link:
Note that we display target ID numbers for all science targets
so that target names are not made public. The program IDs are
hyperlinks which take you to your program's page in Hydra (if
you are already logged on Hydra). Additional feedback is
welcome on this report, although most users will find more
useful information in their Hydra interface.
This
night report contains the following columns which show average
values over the period of time when each target was being
observed. These columns are also reproduced in the "Objects
Observed" page available from your programs tab in Hydra.
| IQ* |
|
arcsec
|
FWHM of guide star(s) |
| Dimm |
|
arcsec
|
Image Quality as estimated by a
nearby Differential Image Motion Monitor |
| SkySBrt* |
|
mag/arcsec2
|
Sky surface brightness as estimated
from the guider cameras |
Skytrans*
|
|
percentage
|
Transparency as
determined by catalog magnitude of guide star
|
| SNR |
|
|
signal-to-noise ratio, used for HPF
targets only right now, based on continuum level in
order 19 (~1 micron) in the Goldilocks reduction |
*Note
that the guiders have B/g/r/i filter changers, and are set to
the filter most closely matching the science instrument in
use:
VIRUS: g`
LRS2-B: g`
LRS2-R: r`
HPF: i`
In your program's page/tab on Hydra, the "objects
observed" also contains the following metrology data:
"S/N (per res)" same as SNR above
"DIMM fwhm" same as Dimm above
"IQ fwhm" same as IQ above
"Sky conditions" show the sky surface brightness,
guide camera filter, and transparency in parentheses like:
19.45 in g` (0.65)
where the SkySBrt = 19.45 mag/arcsec2
the
guider filter was g`
the
Skytrans = 65%
Commissioning, Engineering, and
Guaranteed Time allocations
The HET Board granted the following
allocations for the 20-2 period:
- 20 hours of HPF commissioning
- 15 hours of VIRUS commissioning
- 10 hours of LRS2 commissioning
- 20 hours of HET operations engineering
- 30 hours of Image Quality engineering
- 33 hours of HPF engineering
- 10 hours of LRS2 Guaranteed Time
Observations
- 20 hours of HPF Guaranteed Time
Observations
- 185 hours of HETDEX
In total the Board granted 343 hours of
Comm/Eng/GTO time in 20-2. (323h on-sky and 20h for HET
operations)
The Board also granted 17.5 hours of time to the LIGO HET followup
project, but this time has not been subtracted from the time
available, since the probability of triggering is low (but has
very high potential for scientific significance).
(NB - with the LIGO/VIRGO shutdown in late March, there can be no
GW event triggers for this program)
Breakdown of how science hours for TACs
at each partner were determined:
quantity
|
Apr
(hrs)
|
May
(hrs)
|
Jun
(hrs)
|
Jul
(hrs)
|
Total
(hrs)
|
18deg-18deg
|
248.20
|
224.58
|
199.88
|
215.15
|
887.82
|
Weather-insensitive
engineering time
|
5
|
5
|
5
|
5
|
20.00
|
"Operational" time
|
243.20
|
219.58
|
194.88
|
210.15
|
867.82
|
| Weather loss frac. |
0.32
|
0.32
|
0.38
|
0.48
|
|
Efficiency loss frac.
(align+PRs)
|
0.081
|
0.081
|
0.089
|
0.100
|
|
"Clear science" time
|
152.43
|
138.23
|
110.78
|
99.30
|
500.74
|
Com/Eng/GTO time
|
|
|
|
|
323.00
|
"Allowed" hours
given to TACs
for science
|
|
|
|
|
177.74
|
Hours allowed for each TAC as determined
February 25, 2020:
Partner
|
Share
|
Notes
|
Total hours
allowed
|
Allocated
as of Apr 1
|
Goettingen
|
0.0085
|
|
1.5
|
1.5
|
Munich
|
0.0590
|
|
10.5
|
10.5
|
PSU
|
0.2568
|
time trade: 45.64 - 4.75
|
40.9
|
40.0
|
UT
|
0.6757
|
time trade: 120.10 + 4.75
|
124.8
|
124.1
|
Note that TACs may allocate up to 8.3% at P0, 25% at P1, 33.3% at
P2 and 33.3% at P3; P4 allocations are not restricted. Priorities
of Com/Eng/GTO time are assigned by the HET Board and not from
this formula.
Also note that the PSU and UT TACs have elected not to allocate a
small amount of time (<1h each) which can be allocated to
targets-of-opportunity which arise later in the trimester
SJ, 1 Apr 2020