ETC Request ID: STIS.sp.1367905

Requested Signal/Noise Ratio = 5.000 at wavelength 2300.00 Å (per resolution element)

gives: Time = 7,717.7147 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 0.006 87.06 9.33
    Background 0.014 216.10 14.70
        Sky 8.957e-08 1.38e-03 0.04
        Dark Current 0.014 216.10 14.70
Total in selected region 0.020 303.15 17.41
Brightest Pixel (single exposure) (at 2809.60 Å) 0.007 56.12
Count rate entire detector 2,104.558
Buffer Time (sec) 950.32
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 7.114 54,904.006
    Background (sky+dark) 2,097.444 16,187,474.84
Encircled energy fraction 0.85

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Central Wavelength:
Grating: [G230L] R ~ 500
Aperture: 52X0.05


Target: [point source]
Spectrum: Black body at 7000.0K
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.04 applied after normalization
Normalization: Renormalized to vegamag = 19.0 in filter WFC3/UVIS1/F218W
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 27.2