ETC Request ID: STIS.sp.1009953

Exposure time (seconds) = 420.0000 at wavelength 8450.00 Å

gives: SNR = 16.9603 (per resolution element)

gives: Time to Saturation (for a single exposure) = 76,014.58 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: "Electrons per pixel due to background (3.8) is less than the recommended threshold of 20 electrons to avoid poor charge transfer efficiency (CTE). We suggest you consider CTE mitigation strategies described in the STIS Instrument Handbook."


Table of Source and Noise Counts per Pixel

Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box 7 pixels high) (1 pix x 7 pix) (2 pix resel x 7 pix)
    Source 0.886 744.46 27.28
    Background 0.126 105.93 10.29
        Sky 1.028e-04 0.09 0.29
        Dark Current 0.126 105.84 10.29
    Read Out 32.81
Total in selected region 1.012 850.39 43.89
Brightest Pixel (single exposure) (at 8283.80 Å) 0.434 91.17
Global Count Rates
    Source only 1,160.246 487,303.460
    Background (sky+dark) 18,889.812 7,933,721.12
Encircled energy fraction 0.78

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength: 8561
Grating: [G750M] R ~ 5000
Aperture: 52X0.2
Gain: 1.0
# Frames: 2
Binning: dispersion: 1, spatial: 1
Dark: medium


Target: [point source]
Spectrum: Non-stellar Objects SSP 5 Myr Z=0.08 BC [91.0, 1600000.0 Å]
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.3 applied before normalization
Normalization: Flux 1.1e-14 flam at 4000.0 Å
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Table of Source and Noise Counts per Pixel

Plots

These results were computed using: ETC version 25.2