ETC Request ID: STIS.sp.1178849

Requested Signal/Noise Ratio = 25.000 at wavelength 2712.70 Å (per resolution element)

gives: Time = 8,707.0020 seconds


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 7 pix) (2 pix resel x 7 pix)
    Source 0.045 790.25 28.11
    Background 0.011 182.85 13.52
        Sky 2.715e-09 4.73e-05 6.88e-03
        Dark Current 0.011 182.85 13.52
Total in selected region 0.056 973.09 31.61
Brightest Pixel (single exposure) (at 2903.61 Å) 0.038 334.73
Count rate entire detector 2,818.119
Buffer Time (sec) 709.69
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 1,104.930 9,620,628.443
    Background (sky+dark) 1,572.864 13,694,930.69
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Central Wavelength: 2812
Grating: [E230H] R ~ 114000
Aperture: 0.2X0.09


Target: [point source]
Spectrum: User uploaded spectrum: t5500feh150.dat
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.01 applied before normalization
Normalization: Renormalized to vegamag = 9.02 in filter Johnson/V
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 26.1