ETC Request ID: STIS.sp.824397

Requested Signal/Noise Ratio = 500.000 at wavelength 9400.00 Å (per resolution element)

gives: Time = 474.9544 seconds

gives: Time to Saturation (for a single exposure) = 808.50 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: "Electrons per pixel due to background (4.5) 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 pix) (2.0 pix resel x pix)
    Source 265.427 252,131.22 502.13
    Background 0.133 126.39 11.24
        Sky 5.091e-05 0.05 0.22
        Dark Current 0.133 126.34 11.24
    Read Out 44.98
Total in selected region 265.560 252,257.60 504.26
Brightest Pixel (single exposure) (at 9050.55 Å) 148.424 35,247.28
Global Count Rates
    Source only 411,991.468 195,677,173.580
    Background (sky+dark) 19,930.898 9,466,268.28
Encircled energy fraction 0.69

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength: 9336
Grating: [G750M] R ~ 5000
Aperture: 52X0.1
Gain: 4.0
# Frames: 2
Binning: dispersion: 1, spatial: 1
Dark:


Target: [point source]
Spectrum: Bruzual Synthetic Stellar Spectra B0 I
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 1.01 applied before normalization
Normalization: Renormalized to vegamag = 6.9 in filter Johnson/J
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 24.2