Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, May 29, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
UV04  S.Majewski        J.Davidson,J.Winters,J.Beck
UV04  S.Majewski        J.Davidson,J.Winters,J.Beck

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UV04  DSSI           20:35   00:55   
UV04  DSSI           01:55   05:48

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UV04/O      20:14  01:10    0  0.6    0  0.2   0.0  4.1   0    0
UV04/O      01:10  05:48    0  0.7    0    0   0.7  3.3   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: H.Abbot

Opened late due to high winds that died just after sunset. Closed at 00:55 due to rising pollen counts. Pollen decreased dramatically within an hour so opened up again.

Arcsat user mentioned telescope was not connected to ACP. Went into ACP and connected telescope, and all was well.

3.5m slewing failed with error message:
Slew failed: Sub-command(s) failed: MOVE (...): Timed out; MOVE (...): Cancelled on queue by immediate priority command 'INIT'; MOVE (...): Cancelled on queue by immediate priority command 'INIT'"

Couldn't reinitialise axis through TUI:
Sub-command(s) failed: : Sub-command(s) failed: INIT: Timed out; STATUS: Timed out"

Asking for status from talk2boxes->tcc_rot1 produced no output. Reset controller through na2-rotator instead, and then was able to reconnect through TUI and get back on sky. Lost 10 minutes to this.


                    ------- FAILURE LOG -------

              FAILURE MODE     TIME
PROG   INSTR     TI/SHU    START  FINISH  DESCRIPTION
----------------------------------------------------------------------


            ---------------- FOCUS LOG ---------------
Time  Instrument  Focus     Az  El  Temp Strc Prim  Sec  Air  filt  FWHM
--------------------------------------------------------------------------
 20:57 dssi   491( 1749) 193  67  14.8 16.1 16.4 15.9 14.8   692nm 1.10

               ------------- WEATHER LOG ----------------

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    65    31     22   241  (WSW)    842 mstly clr    none 
     17:00    67    30     17   224   (SW)   1018 mstly clr    none 
     18:00    65    26     30   229   (SW)   1560 mstly clr    none 
     19:00    61    25     26   224   (SW)   3803  ptly cldy   none 
     20:00    60    25     27   238  (WSW)   2548  ptly cldy   none 
     21:00    59    24     19   255  (WSW)   2542  ptly cldy   none 
     22:00    58    21     18   269    (W)   2136  ptly cldy   none 
     23:00    57    19     22   265    (W)   1932  ptly cldy   none 
     00:00    56    18     14   261    (W)   1867  ptly cldy   none 
     01:00    54    18     15   254  (WSW)   1634  ptly cldy   none 
     02:00    52    17     10   260    (W)   1786    clear     none 
     03:00    51    17     18   278    (W)   1900    clear     none 
     04:00    50    18     17   272    (W)   1900    clear     none 
     05:00    49    20     19   271    (W)   1857    clear     none 

     Note: the wind was coming from the azimuth listed.
     The convention used is north=0 degrees, east=90 degrees.
     The dust count is particles > 1u per 0.1 cubic feet.

              ----------  TELESCOPE SOFTWARE  ----------

Current TCC version: 1.4.2
Current HUB version: v20171231_01
Current TUI version: 3.1.8