ETC Request ID: STIS.sp.824460

Exposure time (seconds) = 301.0000 at wavelength 1598.00 Å

gives: SNR = 21.7520 (per resolution element)

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Buffer time 32.1683 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 pix) (2.0 pix resel x pix)
    Source 0.845 508.41 22.55
    Background 0.001 0.63 0.80
        Sky 7.268e-15 4.38e-12 2.09e-06
        Dark Current 0.001 0.63 0.80
Total in selected region 0.846 509.04 23.37
Brightest Pixel (single exposure) (at 1497.71 Å) 0.742 223.41
Count rate entire detector 62,172.965
Buffer Time (sec) 32.17
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 32,812.369 9,876,523.060
    Background (sky+dark) 157.286 47,343.21
Encircled energy fraction 0.94

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength: 1598
Grating: [E140H] R ~ 114000
Aperture: 31X0.05NDA
Glow region: low


Target: [point source]
Spectrum: User uploaded spectrum: cuvir.dat
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 24.2