ETC Request ID: STIS.ta.1297953

Requested Signal/Noise Ratio = 40.000

gives: Time = 9.9468 seconds

gives: Time to Saturation (for a single exposure) = 5,121.60 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.


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 210.212 2,090.95 45.73
    Background 0.659 6.56 2.56
        Sky 0.434 4.32 2.08
        Dark Current 0.225 2.24 1.50
    Read Out 25.20
Total in selected region 210.872 2,097.51 52.27
Brightest Pixel (single exposure) 23.430 233.06
Global Count Rates
    Source only 13,393,803.781 133,226,109.409
    Background (sky+dark) 53,877.858 535,914.77
Background per unit area
    Sky Background (arcsec-2) 19.296 191.939
    Dark Current (arcsec-2) 10.000 99.468
Extraction region
box of 3 x 3 pixels
    Effective Sky Area (pixels) 9.00
Effective Wavelength 7171.81 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): 9000.0
Spectrum: Standard HST Star Spectra Solar Spectrum (G2V, -26.75) [1195.0, 26957.4 Å]
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 15.5 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 26.2