ETC Request ID: STIS.sp.1012305

Requested Signal/Noise Ratio = 40.000 at wavelength 4451.00 Å (per resolution element)

gives: Time = 0.4793 seconds

gives: Time to Saturation (for a single exposure) = 16.46 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: "Electrons per pixel due to background (0.0043) 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 2,437.988 2,336.98 48.34
    Background 0.127 0.12 0.35
        Sky 7.822e-04 7.50e-04 0.03
        Dark Current 0.126 0.12 0.35
    Read Out 32.81
Total in selected region 2,438.114 2,337.10 58.42
Brightest Pixel (single exposure) (at 5699.90 Å) 2,005.368 480.57
Global Count Rates
    Source only 2,445,089.163 1,171,893.501
    Background (sky+dark) 18,955.825 9,085.23
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength:
Grating: [G430L] R ~ 500
Aperture: 52X0.2
Gain: 1.0
# Frames: 2
Binning: dispersion: 1, spatial: 1
Dark: medium


Target: [point source]
Spectrum: Black body at 3700.0K
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 8.08 in filter Johnson/V
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