ING Banner
Home > Astronomy > INGRID > Limiting Magnitudes

Limiting Magnitudes

Point Sources


The plots below all assume that one is observing in the background limited case. The exposure time refers to the total on-object exposure time. It does not include either the exposure time on-sky nor any overheads.

  • Limiting magnitude versus on-object integration time, for 0.7" seeing and S/N=3

Limiting magnitude vs time


  • Limiting magnitude versus seeing, for 1 hour on-object integration time and S/N=3

Limiting magnitude vs seeing


  • Limiting magnitude versus signal-to-noise ratio, for 1 hour on-object integration time and 0.7" seeing

Limiting magnitude vs snr

Extended Sources


The plots below all assume that one is observing in the background limited case. The exposure time refers to the total on-object exposure time. It does not include either the exposure time on-sky nor any overheads.

  • Limiting magnitude versus on-object integration time, S/N per arcsec²=3

Limiting magnitude vs time


  • Limiting magnitude versus signal-to-noise ratio per arcsec², for 1 hour on-object integration time

Limiting magnitude vs snr


Top | Back

Contact:  (INGRID Instrument Specialist)
Last modified: 17 June 2012