ETC Request ID: STIS.ta.1009290

Requested Signal/Noise Ratio = 40.000

gives: Time = 2.4237 seconds

gives: Time to Saturation (for a single exposure) = 412.53 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 853.697 2,069.08 45.49
    Background 0.597 1.45 1.20
        Sky 0.435 1.05 1.03
        Dark Current 0.162 0.39 0.63
    Read Out 24.60
Total in selected region 854.294 2,070.53 51.73
Brightest Pixel (single exposure) 290.889 705.02
Global Count Rates
    Source only 1,707.395 4,138.165
    Background (sky+dark) 46,585.728 112,908.53
Background per unit area
    Sky Background (arcsec-2) 19.330 46.849
    Dark Current (arcsec-2) 7.200 17.450
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 0.17
Effective Wavelength 7707.26 Å

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


Target: [point source]
Spectrum: User uploaded spectrum: trappist1.dat
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 18.8 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2