Subject: Re: [sloan-25mlog 1973] Re: 2.5m obslog 20141108 (SJD 56970)
From: Paul Harding
Date: Fri, 14 Nov 2014 17:00:10 -0500
Thanks Dan.
So a possible "self consistency check" update to the pointing model =
procedure would be for the derived offset for the current star to be =
applied
and it should be exactly centered on the optical/rotator axis (within =
seeing errors). Such error could be monitored.
Paul
On Nov 14, 2014, at 4:47 PM, Dan Long  wrote:
> Hi Paul,
>=20
>   As long as everyone agrees what the position of the rotator is, is =
shouldn't matter.  The problem is that the data collection routine for =
the pointing model assumes the rotator moves to 0 deg. object for each =
slew, and when it doesn't, the position error vector of the star is =
determined incorrectly (e.g. assumes north is up on the ccd when it =
could be in any random direction).
>=20
> -Dan
>=20
>=20
> On Nov 14, 2014, at 2:28 PM, Paul Harding wrote:
>=20
>> In my current state still recovering form Chile
>> I don't understand why errors in the rotator position matter to the =
pointing model if the reference point is the center of the rotator axis  =
(the optical axis).=20
>>=20
>> Paul
>>=20
>> On Nov 9, 2014, at 7:32 AM, dmbiz@apo.nmsu.edu wrote:
>>=20
>>>=20
>>>                     APACHE POINT OBSERVATORY SDSS 2.5M
>>>=20
>>>                               OBSERVING LOG
>>>                        Saturday November 08, 2014
>>>=20
>>>                                (SJD 56970)
>>>=20
>>> ----  Observing Team ----
>>>=20
>>> Karen Kinemuchi
>>> Dmitry Bizyaev
>>> Gordon Freischlad
>>>=20
>>>=20
>>>=20
>>> Kaike Pan (first half of the night)
>>> Jon Brinkmann (support over the phone)
>>>=20
>>>=20
>>> ---- Observing Summary ----
>>>=20
>>> Clear night with moderate seeing.=20
>>>=20
>>> We finished the high-altitude tracking test with two stars, see log.
>>>=20
>>> Home-relaxed mirrors successfully.=20
>>> Updated fiducial tables - were unable to update using new machines=20=
>>> and new procedures. Had to do it on hub25m, by suggestion of JB.
>>>=20
>>> Attempted to complete 155- or 150-pt pointing model.=20
>>> During collecting data had multiple rotator fiducial errors
>>> and rotator axis failures. Fitting to collected data showed terribly =
high
>>> r.m.s.
>>>=20
>>> In the morning we found that zero position of rotator is reported as =
~ -62.5 deg
>>> in MCP.=20
>>> Telescope is not in working conditions now due to this problem.
>>> ---------------------------------------------------------------
>>> As a result, were unable to replace engineering camera with=20
>>> a cartridge. Need help from engineers to fix the problem!
>>>=20
>>> Old Plate-db is not working - reports errors, so we cannot select =
plates for
>>> tomorrow BOSS observations.=20
>>> Tried to apply old procedures to resurrect old plate-db, but=20
>>> the plan plugging page doesn't work any way.
>>>=20
>>>=20
>>> ---- Observing Plan ----
>>>=20
>>> Schedule : Sat  8 NOV 2014    56970.0   0.96    00:43  12:33    =
20:52  08:44  =20
>>> Night =20
>>> APOGEE-2 (11.8 h)
>>> But the real plan is to finish Paul's zenith guiding tests and do =
new pointing
>>> model.
>>>=20
>>>=20
>>>=20
>>> ---- Observing Log ----
>>>=20
>>> Afternoon Checkout
>>> ------------------
>>> 22:49Z Apogee Cals started=20
>>>=20
>>>=20
>>> Tried to get mirror stats, but Alt is at 29.5 degrees.
>>> Mirror numbers are ok.
>>>=20
>>> Did not do guider prep because of the ecamera. Ecamera connection is =
sound.
>>> All actors ok.
>>>=20
>>> Cart bay is ready.
>>> Telescope is ready.
>>> 23:28Z ventilation begins.
>>>=20
>>>=20
>>> Night:
>>> ------
>>> 00:12Z enclosure opened
>>> LN2 filled.=20
>>> By tonight's pan, we go ahead and do home/relax mirrors before the =
tests and
>>> pointing mode.
>>>=20
>>>=20
>>> Finished home/relaxing first.
>>>=20
>>>=20
>>> ~ 01:54Z started guiding-at-zenith test
>>>=20
>>> Focusing: seeing ~ 1.3" with the eng camera
>>> Used Elena's scripts: very convenient and quick to focus!
>>>=20
>>> Tracking star through the zenith , started at HA ~ -15 min, Dec ~ 36 =
deg.
>>>=20
>>> Problems during the tracking: reported bad fiducial=20
>>> 02:27:56   Az:  ind=3D25,  deg=3D167.4,   err=3D -737=20
>>> error is too large to be corrected ( > 600)
>>>=20
>>> After that we decided t not correct fiducials on the fly, and to go =
with
>>> uncorrected until the end of the tracking test.=20
>>>=20
>>>=20
>>> We tracked from ~ -15 min to +15 min in HA.=20
>>> Ecam images    /data/ecam/56970/   from 24 to 135
>>>=20
>>> Second star:  started at ~ -25 min HA,   dec ~ +29
>>>=20
>>> Ecamera exposures:  /data/ecam/56970/   from 136 to 306
>>>=20
>>>=20
>>>=20
>>> During the second track, the fiducial AZ error showed close to the =
end of the
>>> sequence:
>>> 03:27:00   Az:  ind=3D12,  deg=3D-27.8,   err=3D 637=20
>>>                  error is too large to be corrected ( > 600)
>>>=20
>>>=20
>>>=20
>>> 03:33:08   Az:  ind=3D11,  deg=3D-42.8,   err=3D 754=20
>>>                  error is too large to be corrected ( > 600)
>>>=20
>>>=20
>>> 3:45Z started pointing model
>>> Seeing is ~ 2.4"
>>>=20
>>> We had problems with running scripts for updating fiducial tables. =
John P was
>>> not reachable. Called JB: we have to use the old machine to update =
fiducial
>>> tables: sdss3@sdss3-hub, or old hub machine (hub25m).
>>>=20
>>> John P: we checked it on new machines in August, and it worked. File =
a ticket.=20
>>> We went with 155-point grid, but starting with ~ 30th star the =
pointing program
>>> started to see no stars in the field. After ~ 20th black frame we =
stopped
>>> executing this grid. We noticed that Calib offset in Az was ~ 8 =
arcmin, and in
>>> Alt was ~ 1 arcmin.=20
>>> Kaike recommended to switch to 150 - point model, since it has been =
done in the
>>> past few times, whereas the 155-pt is a new one.=20
>>>=20
>>> We cleared offsets.
>>> 6:55Z switched to running 150-pt model.
>>>=20
>>> After star #47 we observed that calib offset got ~ 8 arcmin in AZ, =
and the next
>>> star was missing. We suspected something was wrong and cleared calib =
offsets.=20
>>>=20
>>> Star #48 - offsets are zeroed. Sent it to the star again (tcc =
track), found it
>>> close to the center of the chip.=20
>>>=20
>>> After that we had several occurrences of bad fiducials (mostly on =
the rotator
>>> axis), large calib offsets, and we corrected these problems on the =
fly, not
>>> loosing significant amount of time.=20
>>> Noticed:
>>> Telescope closes petals automatically when approaches dangerous =
spots "in the
>>> sky" - e.g. DIMM location at AZ ~ 78 - 105 deg, ALT ~ 19 - 21 deg. =
It opens
>>> petals automatically when goes away from such spots. Exposures taken =
**through
>>> the closed petals** have stars, and are successfully used for making =
pointing
>>> model.=20
>>>=20
>>>=20
>>> After completion of the pointing model we tried to fit points, but =
got HUGE
>>> r.m.s., ~ 50" (with a few outliers over 200")
>>>=20
>>> Tried to edit out offensive points. Removed 3-4 points with large =
r.m.s., but
>>> then figured out that the bulk of the points have r.m.s. > 30", and =
formal
>>> r.m.s. ~ 40". This is abnormal. We tried to fit the interrupted, =
first set,
>>> which has 30 points done only, but got the same order of magnitude =
for r.m.s.=20
>>>=20
>>> Something is wrong here, we cannot accept this pointing model.=20
>>>=20
>>>=20
>>>=20
>>> After sending telescope to stow we found that rotator is FAR AWAY =
from zero
>>> position, although reported Rot in MCP is zero.=20
>>> We found, coarsely, that it is close to real zero when MCP shown =
-62.5 deg.
>>>=20
>>> We cannot safely replace eng. camera with this rotator problem.=20
>>>=20
>>> 12:05Z telescope closed.
>>> LN2 enforced
>>> A + B calibs started
>>>=20
>>>=20
>>> ---- Telescope Status ----
>>>=20
>>> 23:28Z     Started ventilation
>>> 00:12Z     encl25m : open
>>> 12:05Z     encl25m : closed
>>>=20
>>> No interlocks bypassed
>>>=20
>>> Status at:  12:25Z
>>> Telescope stowed at:    121.0, 30.0, rotator is messed up  mount
>>> Instrument mounted:     cartridge =3D  Eng Camera  =20
>>> Counterweights at:          366
>>> LN2 autofill systems:   Connected and turned on
>>> 180L LN2 dewar scales:  SP1   191     lbs,  21   psi
>>>                      SP2   133     lbs,  20   psi
>>>=20
>>>=20
>>>=20
>>>=20
>>> ---- Software Used ----
>>>=20
>>> -- STUI software:=20
>>> STUI          : 1.5.0
>>> alerts        : trunk+svn149374
>>> apo           : trunk+svn158476
>>> boss          : v3_5
>>> -boss.daq     : 1.3.2
>>> -boss.specMec : 3.0.4
>>> gcamera       : v2_0
>>> guider        : v2_4
>>> hartmann      : v1_2
>>> hub           : Tag: sdss4_v2_1
>>> mcp           : v6_6_18
>>> -mcp.plc      : 29
>>> -mcp.azFiduci : v1_112
>>> -mcp.altFiduc : v1_112
>>> -mcp.rotFiduc : v1_112
>>> platedb       : v2_3
>>> sop           : v2_11
>>> tcc           : 2.14.0
>>> apogee        : not availble
>>> apogeecal     : not availble
>>> apogeeql      : v1_5_6
>>> -- Other software
>>> sdssProcedure : v3_06
>>> APO-local     : trunk
>>>=20
>>> Setting up: idlspec2d                       Flavor: Linux64    =
Version: v5_7_5
>>> Setting up: |elodie                         Flavor: Linux64    =
Version: v1_3
>>> Setting up: |spinspect                      Flavor: Linux64    =
Version: trunk
>>> Setting up: |specflat                       Flavor: Linux64    =
Version: v1_20
>>> Setting up: |speclog                        Flavor: Linux64    =
Version: trunk
>>> Setting up: |platelist                      Flavor: Linux64    =
Version: trunk
>>> Setting up: |sdss_python_module             Flavor: Linux64    =
Version: v1_3_1
>>> Setting up: |sqlalchemy                     Flavor: Linux64    =
Version: 0.9.7
>>> Setting up: |psycopg2                       Flavor: Linux64    =
Version: 2.5.3
>>> Setting up: |idlutils                       Flavor: Linux64    =
Version: v5_5_16
>>> Setting up: |idl                            Flavor: Linux64    =
Version: 7.1
>>> Setting up: |dust                           Flavor: Linux64    =
Version: v0_1
>>> Setting up: |photolog                       Flavor: Linux64    =
Version: trunk
>>> Setting up: actorcore                       Flavor: Linux64    =
Version: v2_3
>>> Setting up: |opscore                        Flavor: Linux64    =
Version: v2_1
>>> Setting up: |external                       Flavor: Linux64    =
Version: v1_2_0
>>> Setting up: |actorkeys                      Flavor: Linux64    =
Version: trunk
>>> Setting up: |sdss3tools                     Flavor: Linux64    =
Version: v1_7_13
>>> Setting up: |RO                             Flavor: Linux64    =
Version: 3.5.1
>>> Setting up: |tron                           Flavor: Linux64    =
Version: sdss4_v2
>>>=20
>>> -- Other versions ----
>>> idlspec2d (sos3) ---  v5_7_5
>>> plate-mapper3 ------ NOCVS:v5_1_7
>>>=20
>>>=20
>>>=20
>>> ---- Mirror Numbers ----
>>>=20
>>>=20
>>> PRIMARY:
>>> --------
>>> Scale: 1.000000
>>>=20
>>> MIGS		TONIGHT	NOMINAL
>>> Axial A:	0.036	0.031
>>> Axial B:	-0.014	-0.025
>>> Axial C:	-0.023	-0.025
>>> Trans D:	-0.023	-0.022
>>> Lateral E:	10.6934	10.7315
>>> Lateral F:	12.3063	12.319
>>>=20
>>> GALILS
>>> Commanded:  10850 -450 5750 13050 14750 14300
>>> Actual:     10850 -450 5750 13050 14750 14300
>>>=20
>>> SETMIR VALUES
>>> PrimDesOrient: 0.00 0.00 0.00 651.00 937.40
>>> PrimOrient:    0.00 0.00 0.00 651.08 936.54
>>>=20
>>> SECONDARY:
>>> ----------
>>>=20
>>> Focus:      0.00
>>> Air temp:   7.3
>>> Altitude:   29.5
>>>=20
>>> MIGS		TONIGHT	NOMINAL
>>> Axial A:	-7.163	-7.063
>>> Axial B:	-7.22	-7.123
>>> Axial C:	-7.129	-7.03
>>> Trans D:	-0.186	-0.178
>>>=20
>>> GALILS
>>> Commanded: 1707300 1704850 1716650 1400 -2000
>>> Actual:    1707302 1704877 1716644 1400 -2000
>>>=20
>>> SETMIR VALUES
>>> SecDesOrient: 1357.00 -3.80 0.00 0.00 9.58
>>> SecOrient:    1356.99 -3.79 0.00 0.00 9.45
>>>=20
>>>=20
>>>=20
>>> ____________________________________________________________
>>> Logs of Nightly APO Activities
>>> =
https://trac.sdss.org/tracmailman/browser/private/sloan-25mlog/index.html
>>=20
>> ____________________________________________________________
>> Logs of Nightly APO Activities
>> =
https://trac.sdss.org/tracmailman/browser/private/sloan-25mlog/index.html
>=20