ETC Request ID: STIS.sp.1371346

Exposure time (seconds) = 2,707.0000 at wavelength 1550.00 Å

gives: SNR = 10.7886 (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 0.025 133.89 11.57
    Background 0.001 5.68 2.38
        Sky 3.260e-13 1.76e-09 4.20e-05
        Dark Current 0.001 5.68 2.38
Total in selected region 0.026 139.58 12.41
Brightest Pixel (single exposure) (at 1285.92 Å) 0.030 81.52
Count rate entire detector 3,025.918
Buffer Time (sec) 660.96
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 1,728.012 4,677,728.233
    Background (sky+dark) 157.418 426,130.97
Encircled energy fraction 0.95

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: Bruzual Synthetic Stellar Spectra O7 I
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.05 applied before normalization
Normalization: Renormalized to vegamag = 12.936 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 27.2