ETC Request ID: STIS.sp.1353263

Exposure time (seconds) = 2,600.0000 at wavelength 1160.00 Å

gives: SNR = 1.7314 (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 7 pix) (2 pix resel x 7 pix)
    Source 0.002 7.80 2.79
    Background 0.001 5.46 2.34
        Sky 7.164e-14 3.73e-10 1.93e-05
        Dark Current 0.001 5.46 2.34
Total in selected region 0.003 13.26 4.51
Brightest Pixel (single exposure) (at 1332.93 Å) 0.013 32.91
Count rate entire detector 1,462.977
Buffer Time (sec) 1,367.08
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 786.480 2,044,849.090
    Background (sky+dark) 157.418 409,287.23
Encircled energy fraction 0.77

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength: 1425
Grating: [E140M] R ~ 45800
Aperture: 0.2X0.2
Glow region: low


Target: [point source]
Spectrum: Castelli-Kurucz Models O3V 45000 4.5
Extinction E(B-V): SMC Bar (Rv=2.74) = 0.15 applied before normalization
Normalization: Renormalized to vegamag = 12.53 in filter Johnson/U
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 27.1