Stellar Observations Network Group (SONG): SONG in New Mexico

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on_sky_testing [2025/10/10 20:12] – holtzon_sky_testing [2025/10/13 01:49] (current) – jasonj
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 First light on 251002 obtained spectra! However, images with iodine cell appeared poor and resulting spectra had much lower throughput than without iodine, perhaps due to combination of image quality and guiding on poor images. First light on 251002 obtained spectra! However, images with iodine cell appeared poor and resulting spectra had much lower throughput than without iodine, perhaps due to combination of image quality and guiding on poor images.
  
-Modifications made to change guiding to ignore saturated pixels to allow for longer exposure times to average out the seeing.+Modifications made to change guiding algorithm to ignore saturated pixels to allow for longer exposure times to average out the seeing.
  
 251003 observed several stars. Throughput without iodine doesn't look too bad when compared with Tenerife measurements, a little lower, but not dramatically so. Throughput with iodine still looks poor. In plot below, three dots are from SONG paper with photon rates from these three stars, claimed to be median of many exposures. Repeatability of multiple observations of multiple stars is encouraging from the point of view of guiding. 251003 observed several stars. Throughput without iodine doesn't look too bad when compared with Tenerife measurements, a little lower, but not dramatically so. Throughput with iodine still looks poor. In plot below, three dots are from SONG paper with photon rates from these three stars, claimed to be median of many exposures. Repeatability of multiple observations of multiple stars is encouraging from the point of view of guiding.
on_sky_testing.txt · Last modified: by jasonj