ETC Request ID: STIS.ta.1443364

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0069 seconds

gives: Time to Saturation (for a single exposure) = 3.51 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.00687138 is less than the minimum exposure time for this detector (0.1)


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 307,838.187 2,115.27 45.99
    Background 0.675 4.64e-03 0.07
        Sky 0.432 2.97e-03 0.05
        Dark Current 0.243 1.67e-03 0.04
    Read Out 26.10
Total in selected region 307,838.863 2,115.28 52.88
Brightest Pixel (single exposure) 34,204.318 235.03
Global Count Rates
    Source only 794,743,086.650 5,460,981.684
    Background (sky+dark) 55,864.519 383.87
Background per unit area
    Sky Background (arcsec-2) 19.219 0.132
    Dark Current (arcsec-2) 10.800 0.074
Extraction region
box of 3 x 3 pixels
    Effective Sky Area (pixels) 9.00
Effective Wavelength 7799.68 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): 8.6
Spectrum: Pickles Models M2V 3548.13K
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 8.6 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 28.2