Subject: Re: [sloan-25mlog 6265] 2.5m obslog 20220916 (SJD 59839) From: Kaike Date: Sat, 17 Sep 2022 08:30:42 -0600 > On Sep 17, 2022, at 6:00 AM, asimmons@apo.nmsu.edu wrote: >=20 >=20 > APACHE POINT OBSERVATORY SDSS 2.5M >=20 > OBSERVING LOG > Friday September 16, 2022 >=20 > (SJD 59839) >=20 > ---- Observing Team ---- >=20 > Audrey Oravetz=20 > Viktor Malanushenko >=20 >=20 >=20 > ---- Observing Plan ---- >=20 > Fri 16 Sep 2022 59839 0.56 02:01 02:15 11:40 18:56 04:22 --- dark = until 05:08 ( 2.9 h), then bright ( 6.8 h, w/ 0.3 h for 12 deg design) >=20 >=20 > ---- Observing Summary ---- >=20 > Open the entire night. >=20 > Observed: > --------- > Time field-dsgn-conf Design type BOSS/APOGEE exp complete? = Comment > = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= > 01:41:15 103227-124131-6795 dark_plane 3x900 + 3xAB DONE Started 5 = minutes before 12 degree twilight, partly cloudy, poor seeing > 02:44:57 101027-116310-6796 dark_plane 4x900 + 4xAB DONE Very cloudy > 03:59:21 104663-130715-6797 dark_monit 1x900 + 1xAB DONE Clear, = seeing 1.5=E2=80=9D > 04:26:42 104663-130716-6798 dark_monit 2x900 + 2xAB DONE=20 > 05:08:36 104453-128533-6801 bright 1x900 + 1xAB DONE, 2 out-of-value = robot errors, disabled 437, 3 mins lost > 05:29:46 100456-114079-6802 bright 1x900 + 1xAB DONE Partly cloudy > 05:51:25 102485-122468-6803 bright 1x900 + 1xAB DONE =E2=80=9C > 06:13:45 101715-118935-6804 bright 1x900 + 1xAB DONE =E2=80=9C > 06:39:03 101788-119705-6805 bright 1x900 + 1xAB DONE =E2=80=9C > 07:00:47 101788-119706-6806 bright 1x900 + 1xAB DONE =E2=80=9C > 07:22:22 101788-119707-6807 bright 1x900 + 1xAB DONE =E2=80=9C > 07:46:55 101788-119708-6808 bright 1x900 + 1xAB DONE, Took 3 attempts = at preloading the design before being successful - loss of 5 mins > 08:07:50 101760-119378-6809 bright 1x900 + 1xAB DONE Clear > 08:31:06 101760-119379-6810 bright 1x900 + 1xAB DONE =E2=80=9C > 08:52:01 101760-119380-6811 bright 1x900 + 1xAB DONE =E2=80=9C > 09:13:01 101760-119381-6812 bright 1x900 + 1xAB DONE =E2=80=9C > 09:34:30 101720-118965-6813 bright 1x900 + 1xAB DONE =E2=80=9C > 09:57:44 101720-118966-6814 bright 1x900 + 1xAB DONE =E2=80=9C > 10:18:44 103699-126121-6815 bright 1x900 + 1xAB DONE Cloudy > 10:40:40 103701-126140-6816 bright 1x900 + 1xAB DONE Partly cloudy > 11:02:27 103742-126359-6817 bright 1x900 + 1xAB DONE =E2=80=9C > 11:24:07 103709-126187-6818 bright 1x900 + 1xAB DONE Clear >=20 > Notes: > =3D=3D=3D=3D=3D >=20 > * APOGEE dome flats, BOSS flats, and an extra set of Hartmanns were = taken in=20 > twilight while the secondary fill was running. Can anyone think of a = reason why > we should not do this strategy? This seems like a great way to = optimize > twilight time.=20 >=20 > * There was not enough time during twilight to fit in a bright field = before > 12 degree twilight this evening so we opted to start exposing with the > first scheduled dark_plane field about a few minutes before 12 degree > twilight instead, especially since the priority was set higher than = the bright > field. However, the sky background with the BOSS cameras was proven to = be too > bright to handle the dark_plane fields this early (as seen within = SOS). > In SDSS-IV, we began observations with the BOSS cameras typically = around > 15 degree twilight and found that that sky brightness was acceptable = for > the S/N collection (though sometimes we got away with starting around = 13 > degrees). May we propose that bright fields be observed/scheduled up > through 10 minutes before 15 degree twilight (since it takes roughly = 10 > minutes for the Hal gotoField with ALL STAGES to complete)? In other = words, > dark time can start no earlier 13-15 degree twilight. >=20 Yes, Based on SDSS III and IV data, the earliest to start dark BOSS = exposures is 13 degree, but the data after/at 15 degree will be better. = Consider all these factors, I recommend that we get the scheduled = evening bright design if we can start the exposure on it before 11 = degree evening. Otherwise, we should skip the evening bright design.=20