Apache Point Observatory
                      3.5m Telescope Night Log
                      Tuesday, May 26, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
AP01  S.Merkowitz       T.Sutherland,H.Abbott 
NM06  W.Roberson        E.Nielsen,B.Roberson  
GS02  D.Gies            A.Chaturvedi          

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
AP01  APOLLO         20:17   21:13   
NM06  ECHELLE        23:36   01:11
GS02  ECHELLE        01:11   05:47

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
AP01/W      20:12  21:12    0   0.1   0    0   0.0  0.9   0    0
NM06/R      21:12  01:10    0   2.4   0    0   0.0  1.6   0    0
GS02/R      01:10  05:49    0    0    0    0   2.3  2.3   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: A.Townsend

We opened up just after sunset due to the dregs of a storm going past. We managed to get through APOLLO observations with only minor cloud annoyances before handover, when all of the clouds showed up at once. I closed up since there was also a little more radar coming through, and we didn't open again until a little after 23:30. After that the clouds cleared up and we had a pretty peaceful night. 

No telescope or instrument problems. 

First ecam focus at 23:40 was at high airmass (17 alt)

                    ------- 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
--------------------------------------------------------------------------
 20:21 APOLLO     427( 1910)  36  39  10.1 12.4 12.6 12.5 10.4   530  1.50
 23:40 ecamera    368(  -22) -83  17  10.3 10.1 10.4  9.9 10.1   ND1  1.39
 00:03 ecamera    434(   10) -12  40  10.0  9.9 10.3  9.7 10.0   ND1  0.97
 01:18 ecamera    456(  -11) -90  53   9.8  9.1  9.7  8.9  9.2   ND3  1.23

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    56    27      6   259    (W)   1711 mstly cldy   none 
     17:00    55    32      9   265    (W)   1566 mstly cldy   none 
     18:00    47    39      7     6    (N)   2253 mstly cldy   rain 
     19:00    49    33     13    68  (ENE)   1229  ptly cldy   none 
     20:00    51    33      9   269    (W)   1305  ptly cldy   none 
     21:00    51    33      7   232   (SW)   1389  ptly cldy   none 
     22:00    51    32     10   208  (SSW)   1473  ptly cldy   none 
     23:00    51    32      8   189    (S)   1626 mstly clr    none 
     00:00    51    30      5   188    (S)   1655    clear     none 
     01:00    49    32      4   182    (S)   1646    clear     none 
     02:00    52    28      7   223   (SW)   1652    clear     none 
     03:00    51    31     10   198  (SSW)   1783    clear     none 
     04:00    50    31     12   196  (SSW)   1717    clear     none 
     05:00    50    31     14   205  (SSW)   2018    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