ETC Request ID: STIS.sp.781135

Requested Signal/Noise Ratio = 15.000 at wavelength 2074.30 Å (per resolution element)

gives: Time = 103,753.7212 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 pix) (2.0 pix resel x pix)
    Source 0.004 832.28 28.85
    Background 0.011 2,178.83 46.68
        Sky 1.585e-10 3.29e-05 5.73e-03
        Dark Current 0.011 2,178.83 46.68
Total in selected region 0.015 3,011.11 55.49
Brightest Pixel (single exposure) (at 2283.41 Å) 0.010 1,014.67
Count rate entire detector 1,891.508
Buffer Time (sec) 1,057.36
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 227.603 23,614,644.107
    Background (sky+dark) 1,572.864 163,190,494.02
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Central Wavelength: 2163
Grating: [E230H] R ~ 114000
Aperture: 0.2X0.09


Target: [point source]
Spectrum: User uploaded spectrum: t5250feh250.dat
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.03 applied before normalization
Normalization: Renormalized to vegamag = 8.38 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Earth Shine: Average
    Zodiacal Light: Average
    Air Glow: Average

Table of Source and Noise Counts per Pixel

Plots

These results were computed using: ETC version 24.1