ETC Request ID: STIS.sp.181120

Exposure time (seconds) = 3,077.0000 at wavelength 1425.00 Å

gives: SNR = 18.5403 (per resolution element)


Table of Source and Noise Counts per Pixel

Plots

Detailed Information Count rate Total counts Associated noise
(counts/s) (counts) (counts)
Counts (box 7 pixels high) (1 pix x pix) (2.0 pix resel x pix)
    Source 0.057 350.09 18.71
    Background 0.001 6.46 2.54
        Sky 2.936e-12 1.81e-08 1.34e-04
        Dark Current 0.001 6.46 2.54
Total in selected region 0.058 356.55 18.88
Brightest Pixel (single exposure) (at 1303.50 Å) 0.029 89.73
Count rate entire detector 204.255
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 46.037 141,657.359
    Background (sky+dark) 158.217 486,833.89
Encircled energy fraction 0.83

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength:
Grating: [G140L] R ~ 1000
Aperture: 0.2X0.2
Glow region:


Target: [point source]
Spectrum: Bruzual Synthetic Stellar Spectra O9.5 I
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.1 applied before normalization
Normalization: Renormalized to Johnson V = 18.87 in magnitudes relative to Vega
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Table of Source and Noise Counts per Pixel

Plots

These results were computed using: ETC version 19.2