ETC Request ID: STIS.im.189449

Exposure time (seconds) = 1,000.0000

gives: SNR = 5.1325

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Partial overlap between instrument throughput band and input spectrum.


Plots

Detailed Information Count rate Total counts Associated noise
(counts/s) (counts) (counts)
Counts (box of 2 x 2 pixels)
    Source 0.038 37.86 6.15
    Background 0.017 16.55 4.07
        Sky 0.016 15.95 3.99
        Dark Current 6.000e-04 0.60 0.77
Total in selected region 0.054 54.41 7.38
Brightest Pixel (single exposure) 0.014 13.60
Count rate entire detector 4,510.236
Buffer Time (sec)
For APT purposes, the recommended buffer time should be 4/5 of the buffer time calculated above. Please refer to the STIS Instrument Handbook for more details.
Global Count Rates
    Source only 170.937 170,937.210
    Background (sky+dark) 4,339.299 4,339,298.72
Background per unit area
    Sky Background (arcsec-2) 6.699 6,698.935
    Dark Current (arcsec-2) 0.252 251.948
Extraction region
box of 2 x 2 pixels
    Effective Sky Area (pixels) 4.00
Effective Wavelength 1258.08 Å

Instrument name: STIS
Mode: imaging
Detector: FUVMAMA
Aperture: 25MAMA
Glow region:


Target: [extended source]
Source diameter (arcsec): 3.7
Spectrum: User uploaded spectrum
Extinction E(B-V): None
Normalization: None
Redshift: None
Emission Lines:
Line at Center 1216.0 Å    FWHM 1.0 Å   Flux 1.22e-13 Fλ


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 19.2