ETC Request ID: STIS.ta.1012956

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0061 seconds

gives: Time to Saturation (for a single exposure) = 0.23 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.00613133 is less than the minimum exposure time for this detector (0.1)


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 32 x 32 pixels)
    Source 1,847,307.041 11,326.45 106.43
    Background 18.749 0.11 0.34
        Sky 0.317 1.94e-03 0.04
        Dark Current 18.432 0.11 0.34
    Read Out 262.40
Total in selected region 1,847,325.790 11,326.57 283.16
Brightest Pixel (single exposure) 512,599.948 3,142.92
Global Count Rates
    Source only 1,939,380.105 11,890.983
    Background (sky+dark) 18,880.511 115.76
Background per unit area
    Sky Background (arcsec-2) 3.963 0.024
    Dark Current (arcsec-2) 7.200 0.044
Extraction region
box of 32 x 32 pixels
    Effective Sky Area (pixels) 32.00
    Fraction of flux 0.95
    Fraction of flux in brightest pixel 0.26
Effective Wavelength 4529.29 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ/PEAK
Aperture: 31X0.05NDA
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Standard HST Star Spectra WD0308-565 (sdB D, 14.07) [900.0, 400000.0 Å]
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 8.44 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2