ETC Request ID: STIS.ta.1006208

Exposure time (seconds) = 1.0000

gives: SNR = 631.1835

gives: Time to Saturation (for a single exposure) = 0.70 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: CCD Full Well limits: total counts per native pixel 172592 exceeds bright limit 120000 for selected gain


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 398,997.051 398,997.05 631.66
    Background 0.164 0.16 0.40
        Sky 0.002 1.57e-03 0.04
        Dark Current 0.162 0.16 0.40
    Read Out 24.60
Total in selected region 398,997.215 398,997.21 632.14
Brightest Pixel (single exposure) 172,591.944 172,591.94
Global Count Rates
    Source only 797,994.102 797,994.102
    Background (sky+dark) 18,917.910 18,917.91
Background per unit area
    Sky Background (arcsec-2) 0.070 0.070
    Dark Current (arcsec-2) 7.200 7.200
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 0.22
Effective Wavelength 6412.63 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 F2V 7000 4.0
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 4.47 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2