ETC Request ID: STIS.sp.1178845

Requested Signal/Noise Ratio = 40.000 at wavelength 2637.10 Å (per resolution element)

gives: Time = 11,954.1948 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 0.078 1,875.72 43.31
    Background 0.011 251.04 15.84
        Sky 2.723e-09 6.51e-05 8.07e-03
        Dark Current 0.011 251.04 15.84
Total in selected region 0.089 2,126.75 46.89
Brightest Pixel (single exposure) (at 2680.38 Å) 0.036 427.72
Count rate entire detector 2,581.489
Buffer Time (sec) 774.75
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 818.687 9,786,742.697
    Background (sky+dark) 1,572.865 18,802,340.30
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Central Wavelength: 2563
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