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Spot User’s Guide v18
RA and Dec position. If you will use your science target for peaking up, the positions or
offsets should be set to zero.
Figure 80: IRS Staring Mode AOT, also showing the IRS Peak-Up settings.
11.2.2.2 2MASS Catalog Peak-Up Targets
You can use the 2MASS selection tool (activated by pressing the button shown in Figure
80) to perform a search of the full 2MASS catalog for use in IRS peak-up. The tool
extrapolates 2MASS JHKs photometry using stellar photospheric models to predict
spectral type and flux densities at the effective wavelengths of the IRS peak-up blue and
red arrays. The tool outputs a list of stars whose flux densities are between a minimum
value (always ≥ 10 mJy) determined as a function of the local background surface
brightness, and a maximum value of either 150 mJy (for the blue filter) or 340 mJy (for
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