ETC Request ID: STIS.sp.1396294

Requested Signal/Noise Ratio = 40.000 at wavelength 2311.00 Å (per resolution element)

gives: Time = 8,197.1769 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 0.114 1,871.36 43.26
    Background 0.015 252.47 15.89
        Sky 6.317e-09 1.04e-04 0.01
        Dark Current 0.015 252.47 15.89
Total in selected region 0.130 2,123.84 46.78
Brightest Pixel (single exposure) (at 2873.64 Å) 0.159 1,305.27
Count rate entire detector 7,173.638
Buffer Time (sec) 278.80
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 3,956.722 32,433,947.122
    Background (sky+dark) 2,306.871 18,909,827.59
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Central Wavelength: 2707
Grating: [E230M] R ~ 30000
Aperture: 0.2X0.2


Target: [point source]
Spectrum: User uploaded spectrum: t5750feh250.dat
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.04 applied before normalization
Normalization: Renormalized to vegamag = 9.8 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 28.1