ETC Request ID: STIS.ta.1009817

Requested Signal/Noise Ratio = 40.000

gives: Time = 0.0707 seconds

gives: Time to Saturation (for a single exposure) = 12.27 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Result of the calculation 0.0707308 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 29,240.415 2,068.20 45.48
    Background 0.597 0.04 0.21
        Sky 0.435 0.03 0.18
        Dark Current 0.162 0.01 0.11
    Read Out 24.60
Total in selected region 29,241.012 2,068.24 51.70
Brightest Pixel (single exposure) 9,779.898 691.74
Global Count Rates
    Source only 58,480.829 4,136.394
    Background (sky+dark) 46,585.728 3,295.04
Background per unit area
    Sky Background (arcsec-2) 19.330 1.367
    Dark Current (arcsec-2) 7.200 0.509
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 7791.04 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: Black body at 3050.0K
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 14.59 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2