ETC Request ID: STIS.sp.1005090

Exposure time (seconds) = 3,000.0000 at wavelength 1550.00 Å

gives: SNR = 0.4867 (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 2 pixels high) (1 pix x 2 pix) (2 pix resel x 2 pix)
    Source 1.303e-04 0.78 0.88
    Background 3.000e-04 1.80 1.34
        Sky 1.416e-10 8.50e-07 9.22e-04
        Dark Current 3.000e-04 1.80 1.34
Total in selected region 4.303e-04 2.58 1.61
Brightest Pixel (single exposure) (at 1192.50 Å) 0.012 35.92
Count rate entire detector 1,290.539
Buffer Time (sec) 1,549.74
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 1.734 5,201.258
    Background (sky+dark) 1,288.806 3,866,417.03

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength:
Grating: [G140L] R ~ 1000
Aperture: 52X2
Glow region: low


Target: [extended source]
Source diameter (arcsec): 8.0
Spectrum: Empty
Extinction E(B-V): None
Normalization: None
Redshift: None
Emission Lines:
Line at Center 1550.0 Å    FWHM 0.5 Å   Flux 3.5e-15 Fλ


Selected background:
  Sky Background:
    Level:

Table of Source and Noise Counts per Pixel

Plots

These results were computed using: ETC version 25.2