ETC Request ID: STIS.sp.1006634

Exposure time (seconds) = 2,000.0000 at wavelength 1238.00 Å

gives: SNR = 5.2638 (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 0.008 31.41 5.60
    Background 0.001 4.20 2.05
        Sky 1.341e-12 5.37e-09 7.33e-05
        Dark Current 0.001 4.20 2.05
Total in selected region 0.009 35.61 5.97
Brightest Pixel (single exposure) (at 1215.75 Å) 0.011 21.89
Count rate entire detector 239.718
Buffer Time (sec) 8,343.14
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 6.384 12,768.945
    Background (sky+dark) 233.334 466,667.13
Encircled energy fraction 0.77

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength: 1222
Grating: [G140M] R ~ 10000
Aperture: 52X0.2
Glow region: low


Target: [point source]
Spectrum: Castelli-Kurucz Models A5V 8250 4.0
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 4.45 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 25.2