ETC Request ID: STIS.ta.1365446

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.7106 seconds

gives: Time to Saturation (for a single exposure) = 80.75 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 2,936.834 2,086.99 45.68
    Background 0.235 0.17 0.41
        Sky 0.001 7.73e-04 0.03
        Dark Current 0.234 0.17 0.41
    Read Out 25.20
Total in selected region 2,937.069 2,087.15 52.17
Brightest Pixel (single exposure) 1,486.085 1,056.05
Global Count Rates
    Source only 5,873.669 4,173.971
    Background (sky+dark) 27,332.328 19,423.01
Background per unit area
    Sky Background (arcsec-2) 0.048 0.034
    Dark Current (arcsec-2) 10.400 7.390
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 0.25
Effective Wavelength 5006.85 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50OIII
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: User uploaded spectrum: b1v.dat
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.43 applied before normalization
Normalization: Renormalized to vegamag = 9.28 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 27.2