ETC Request ID: STIS.ta.636593

Exposure time (seconds) = 0.1000

gives: SNR = 155.9511

gives: Time to Saturation (for a single exposure) = 1.18 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Partial overlap between instrument throughput band and input spectrum. Please doublecheck the wavelength range covered by the selected spectrum, and the instrument documentation for the selected filter.


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 248,837.777 24,883.78 157.75
    Background 0.593 0.06 0.24
        Sky 0.440 0.04 0.21
        Dark Current 0.153 0.02 0.12
    Read Out 24.00
Total in selected region 248,838.370 24,883.84 159.56
Brightest Pixel (single exposure) 101,907.101 10,190.71
Global Count Rates
    Source only 497,675.554 49,767.555
    Background (sky+dark) 45,885.240 4,588.52
Background per unit area
    Sky Background (arcsec-2) 19.573 1.957
    Dark Current (arcsec-2) 6.800 0.680
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 6756.50 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50LP
Gain: 4.0
# Frames: 1
Binning: 1
Dark:


Target: [point source]
Spectrum: Standard HST Star Spectra BD+28°4211 (Op, 10.51) [1140.6, 10242.7 Å]
Extinction E(B-V): None
Normalization: None
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 22.2