ETC Request ID: STIS.sp.1010029

Exposure time (seconds) = 7,084.0000 at wavelength 1240.00 Å

gives: SNR = 19.1415 (per resolution element)

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: MAMA Bright limits: total count rate per image 101493 exceeds limit for irregularly-variable sources 40 percent of the bright limit 200000 counts per second

WARNING MESSAGE: Buffer time 19.7058 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 0.033 465.32 21.57
    Background 0.001 14.88 3.86
        Sky 1.761e-14 2.50e-10 1.58e-05
        Dark Current 0.001 14.88 3.86
Total in selected region 0.034 480.19 24.31
Brightest Pixel (single exposure) (at 1320.15 Å) 2.155 15,264.79
Count rate entire detector 101,492.905
Buffer Time (sec) 19.71
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 55,678.863 394,429,064.615
    Background (sky+dark) 157.358 1,114,722.36
Encircled energy fraction 0.89

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength: 1234
Grating: [E140H] R ~ 114000
Aperture: 0.2X0.09
Glow region: low


Target: [point source]
Spectrum: User uploaded spectrum: hd32309-iue.txt
Extinction E(B-V): None
Normalization: None
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