ETC Request ID: STIS.sp.1006790

Exposure time (seconds) = 1,104.0000 at wavelength 1347.00 Å

gives: SNR = 32.9384 (per resolution element)

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Buffer time 56.2082 is less than minimum 99 seconds.


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 0.572 1,263.02 35.54
    Background 0.001 2.32 1.52
        Sky 4.233e-15 9.35e-12 3.06e-06
        Dark Current 0.001 2.32 1.52
Total in selected region 0.573 1,265.34 38.35
Brightest Pixel (single exposure) (at 1324.38 Å) 0.219 241.63
Count rate entire detector 35,581.990
Buffer Time (sec) 56.21
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 20,716.242 22,870,731.212
    Background (sky+dark) 157.308 173,668.02
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength: 1343
Grating: [E140H] R ~ 114000
Aperture: 0.2X0.2
Glow region: low


Target: [point source]
Spectrum: Flat in units of Fλ
Extinction E(B-V): None
Normalization: Flux 1e-11 flam at 1350.0 Å
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