ETC Request ID: STIS.ta.1152964

Exposure time (seconds) = 0.1000

gives: SNR = 519.0531

gives: Time to Saturation (for a single exposure) = 0.40 seconds

Exposure time calculation HAD WARNINGS.

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


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Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 2,700,199.811 270,019.98 519.63
    Background 0.597 0.06 0.24
        Sky 0.435 0.04 0.21
        Dark Current 0.162 0.02 0.13
    Read Out 24.60
Total in selected region 2,700,200.408 270,020.04 520.22
Brightest Pixel (single exposure) 300,022.268 30,002.23
Global Count Rates
    Source only 86,865,181.594 8,686,518.159
    Background (sky+dark) 46,585.728 4,658.57
Background per unit area
    Sky Background (arcsec-2) 19.330 1.933
    Dark Current (arcsec-2) 7.200 0.720
Extraction region
box of 3 x 3 pixels
    Effective Sky Area (pixels) 9.00
Effective Wavelength 7172.49 Å

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


Target: [extended source]
Source diameter (arcsec): 0.96
Spectrum: Standard HST Star Spectra Solar Spectrum (G2V, -26.75) [1195.0, 26957.4 Å]
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 5.23 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

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These results were computed using: ETC version 25.2