Spex/IRTF
BigDog configuration
- LMP/MIR: take mirror out, all entries should be off/out.
- Dichroic: OPEN
- OS (order sorting) filter: OPEN
- Rotator: 0.0
- Slit: 0.8 x 15 arcsec
- Grat: #5 LowRes15 0.8-2.5μm.
- Afoc: (spectrometer autofocus) is automatic depending on the grating.
Exposure times for Spex
Targets
- V > 14 120 seconds, 1 coadd
- V ~ 13 90 seconds, 1 coadd
- V < 13 60 seconds, 2 coadds
- V ~ 11 30 seconds, 2 coadds OR 15 seconds, 3 coadds OR 10 seconds 3 coadds
G2v stars
- 8 < V < 11 1 second, 10 coadds OR 3 seconds 10 coadds OR 5 seconds 4 coadds
- V > 12 3 seconds, 15 coadds