MIPS : Aperture Corrections

The tables below are taken from the MIPS Calibration papers. See the MIPS Data Handbook for further information on these aperture corrections.

For our calibration purposes, where single stars or asteroids are observed using photometric observations, we use the following values:

• At 24 um:
  • aperture radius = 35 arcsec,
  • background annulus = 40 arcsec to 50 arcsec,
  • aperture correction = 1.082
• At 70 um:
  • aperture radius = 35 arcsec,
  • background annulus = 39 arcsec to 65 arcsec,
  • aperture correction = 1.22
• At 160 um:
  • aperture radius = 24 arcsec,
  • background annulus = 64 arcsec to 128 arcsec,
  • aperture correction = 2.603

James Muzerolle, Karl Gordon, Chad Engelbracht and John Stansberry (MIPS IT) obtained the original corrections which have been cross-checked by Dario Fadda, Nanyao Lu, William Wheaton and Stefanie Wachter (MIPS IST).

24 micron (10,000 K Blackbody)

70 micron

160 micron

SED

Note that the MIPS SED pipeline automatically applies an aperture correction assuming a 5 pixel aperture. This is optimal for point sources, and users who have taken data with this standard aperture do not need to apply any further correction. Users who have taken data of extended sources with a different aperture need to apply the relevant correction from the table below. See MIPS Features: MIPS SED Data for Extended Emission for further information on how to apply this correction.

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