ETC Request ID: STIS.sp.636584

Exposure time (seconds) = 1,740.0000 at wavelength 2263.00 Å

gives: SNR = 33.9285 (per resolution element)


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 0.364 1,267.44 35.60
    Background 0.013 43.85 6.62
        Sky 5.019e-10 1.75e-06 1.32e-03
        Dark Current 0.013 43.85 6.62
Total in selected region 0.377 1,311.29 37.36
Brightest Pixel (single exposure) (at 2353.76 Å) 0.158 275.11
Count rate entire detector 15,550.203
Buffer Time (sec)
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 10,060.945 17,506,045.114
    Background (sky+dark) 1,887.437 3,284,140.06
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Central Wavelength: 2263
Grating: [E230H] R ~ 114000
Aperture: 0.2X0.09


Target: [point source]
Spectrum: Standard HST Star Spectra BD+28°4211 (Op, 10.51) [1140.6, 10242.7 Å]
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.11 applied before normalization
Normalization: None
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 22.2