From: =?UTF-8?B?Sm9zw6kgU8OhbmNoZXotR2FsbGVnbw==?= Date: Thu, 4 Apr 2024 12:43:40 -0400 Subject: Re: [sloan-25mlog 7118] 2.5m obslog 20240403 (SJD 60404) --000000000000a3b16e0615480a6f Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable It needs 10 solved exposures within the last hour. It weights the more recent exposures more than old ones. Maybe 10 is unnecessary and we can reduce that to 5 exposures. Jos=C3=A9 On Apr 4, 2024 at 09:40:02, Kaike wrote: > Thank you, Jon and Conor. Yes, the scale is what I was thinking about > too. > > Jose: How many guider exposures do we need in order for jaeger to use the > scale determined by cherno for the preload of the next design? > > -Kaike > > On Apr 4, 2024, at 10:27=E2=80=AFAM, Jon Holtzman wro= te: > > For 60403, seems like the scale for first design may have been way off? > > Maybe after restarting cherno, the second field was treated as the first > field of the night, leading again to scale being off? > > Scale for first field is based on temperature (Jos=C3=A9 can say which on= e), so > was there some issue with temperature reading? Or some change in how the > scale is computed? > > Holtz. > > ------------------------------ > *From:* Kaike > *Sent:* Thursday, April 4, 2024 10:14 AM > *To:* Daniel Oravetz ; Conor Sayres ; > Jos=C3=A9 S=C3=A1nchez-Gallego ; Jon Holtzman > *Cc:* obs-report-25m@apo.nmsu.edu > *Subject:* Re: [sloan-25mlog 7118] 2.5m obslog 20240403 (SJD 60404) > > WARNING This email originated external to the NMSU email system. Do not > click on links or open attachments unless you are sure the content is saf= e. > > Hello All, > > I spent some time to check raw images, looks like that low S/N is real. > Only a handful fibers are illuminated in the first 2 apogee exposures and > the first BOSS exposures, sounds like targets are off for some reason. Th= e > images are similar to what we saw when the rotator was off during FPS > commission. > Checked the design and confirmed that it has hundreds of targets. > > Dan: Do you remember what is the rotator offset for the 1st field? Stil= l > hard to understand how cherno can have reasonable guiding rms if the > rotator is off though. If this continue tonight, please try to re-gotofie= ld > after the 1st exposure to see if rotator position will change. > > Thanks, > > -Kaike > > > > > > For the second consecutive night, the first field/design observed had n= o > signal other than sky. Once again, the goto-field sequence completed > without any errors and the telescope was guiding normally with > shutters/petals all open, etc. During the second field of the night > (112360) exposure 366802 also had very low SN2 values. That exposure > occurred after having switched back to the new cherno version, so just in > case there's some yet-not-understood dependency causing these weird cases > of the first field/design after starting the new cherno to not have signa= l > I reverted to the old cherno for the rest of the night. > > > --000000000000a3b16e0615480a6f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable It needs 10 solved exposures within the last hour. It weights the more = recent exposures more than old ones. Maybe 10 is unnecessary and we can red= uce that to 5 exposures.Jos=C3=A9 On Apr 4, 2024 at 09:40:02, Kaike= wrote: Thank you= , Jon and Conor.=C2=A0 Yes, the scale is what I was thinking about too.=C2= =A0Jose: How many guider exposures do we need in order = for jaeger to use the scale determined by cherno for the preload of the nex= t design?-KaikeOn Apr 4, 2024, at 10:27=E2=80=AFAM, Jon Holtzman wrote:For 60403, seems like the scale for first design may = have been way off?=C2=A0=C2=A0Maybe after restarting cherno, the secon= d field was treated as the first field of the night, leading again to scale= being off?Scale for first field is based on temperature (Jos=C3=A9 ca= n say which one), so was there some issue with temperature reading? Or some= change in how the scale is computed?= Holtz.From:=C2=A0Kaike Sent:=C2=A0Thursday, April 4, 2024 10:14 AMTo:=C2=A0Daniel Oravetz ; Conor Sayres ; Jos=C3=A9 S=C3=A1nchez-Gallego ; Jon Holtzman Cc:=C2= =A0obs-report-25m@apo.nmsu.e= du=C2=A0= Subject:=C2=A0Re: [sloan-25mlog 7118] 2.5m obslog 20240403 (SJD 60404)=C2=A0WARNING = This email originated external to the NMSU email system. Do not click on li= nks or open attachments unless you are sure the content is safe.Hel= lo All,=C2=A0 I spent some time to check raw images, looks like tha= t low S/N is real. Only a handful fibers are illuminated in the first 2 apo= gee exposures and the first BOSS exposures, sounds like targets are off for= some reason. The images are similar to what we saw when the rotator was of= f during FPS commission.=C2=A0 Checked the design and confirmed that it= has hundreds of targets.=C2=A0 Dan: Do you remember what is the ro= tator offset for the 1st field? Still hard to understand how cherno can hav= e reasonable guiding rms if the rotator is off though. If this continue ton= ight, please try to re-gotofield after the 1st exposure to see if rotator p= osition will change.=C2=A0 Thanks,-Kaike>> For the second consecutive night, the first field/design observed had= no signal other than sky. Once again, the goto-field sequence completed wi= thout any errors and the telescope was guiding normally with shutters/petal= s all open, etc. During the second field of the night (112360) exposure 366= 802 also had very low SN2 values. That exposure occurred after having switc= hed back to the new cherno version, so just in case there's some yet-no= t-understood dependency causing these weird cases of the first field/design= after starting the new cherno to not have signal I reverted to the old che= rno for the rest of the night. --000000000000a3b16e0615480a6f--