Spex/IRTF

BigDog configuration

  1. LMP/MIR: take mirror out, all entries should be off/out.
  2. Dichroic: OPEN 
  3. OS (order sorting) filter: OPEN
  4. Rotator: 0.0
  5. Slit: 0.8 x 15 arcsec
  6. Grat: #5 LowRes15 0.8-2.5μm.
  7. Afoc: (spectrometer autofocus) is automatic depending on the grating.

Exposure times for Spex

Targets

  1. V > 14 120 seconds, 1 coadd
  2. V ~ 13 90 seconds,  1 coadd
  3. V < 13 60 seconds,  2 coadds
  4. V ~ 11 30 seconds, 2 coadds OR 15 seconds, 3 coadds OR 10 seconds 3 coadds

G2v stars

  1. 8 < V < 11 1 second, 10 coadds OR 3 seconds 10 coadds OR 5 seconds 4 coadds
  2. V > 12  3 seconds, 15 coadds