ETC Request ID: STIS.sp.827417

Exposure time (seconds) = 1,500.0000 at wavelength 2026.00 Å

gives: SNR = 32.6135 (per resolution element)

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Buffer time 92.2038 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 0.394 1,182.32 34.38
    Background 0.011 31.50 5.61
        Sky 9.400e-12 2.82e-08 1.68e-04
        Dark Current 0.011 31.50 5.61
Total in selected region 0.405 1,213.82 36.25
Brightest Pixel (single exposure) (at 2224.30 Å) 0.221 331.63
Count rate entire detector 21,691.081
Buffer Time (sec) 92.20
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 14,157.800 21,236,699.694
    Background (sky+dark) 1,572.864 2,359,296.00
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Central Wavelength: 2113
Grating: [E230H] R ~ 114000
Aperture: 0.1X0.03


Target: [point source]
Spectrum: Bruzual Synthetic Stellar Spectra O9 III
Extinction E(B-V): None
Normalization: Flux 1e-11 flam at 2026.0 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 24.2