ETC Request ID: STIS.ta.1165987

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0123 seconds

gives: Time to Saturation (for a single exposure) = 1.72 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0122634 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 3 x 3 pixels)
    Source 170,172.076 2,086.88 45.68
    Background 0.227 2.78e-03 0.05
        Sky 0.002 1.92e-05 4.38e-03
        Dark Current 0.225 2.76e-03 0.05
    Read Out 25.20
Total in selected region 170,172.302 2,086.89 52.17
Brightest Pixel (single exposure) 69,684.999 854.57
Global Count Rates
    Source only 340,344.152 4,173.766
    Background (sky+dark) 26,257.865 322.01
Background per unit area
    Sky Background (arcsec-2) 0.070 8.528e-04
    Dark Current (arcsec-2) 10.000 0.123
Extraction region
box of 3 x 3 pixels
    Effective Sky Area (pixels) 9.00
    Fraction of flux 0.50
    Fraction of flux in brightest pixel 0.20
Effective Wavelength 6756.98 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F25ND3
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Castelli-Kurucz Models G2V 5750 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 5.5 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 26.1