ETC Request ID: STIS.sp.1014730

Exposure time (seconds) = 2,300.0000 at wavelength 1600.00 Å

gives: SNR = 2.7594 (per resolution element)

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Partial overlap between instrument throughput band and target spectrum. Please doublecheck the wavelength range covered by the selected spectrum, and the instrument documentation for the selected filter.


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 0.002 8.81 2.97
    Background 3.000e-04 1.38 1.17
        Sky 8.040e-12 3.70e-08 1.92e-04
        Dark Current 3.000e-04 1.38 1.17
Total in selected region 0.002 10.19 3.19
Brightest Pixel (single exposure) (at 1215.30 Å) 0.106 244.11
Count rate entire detector 221.625
Buffer Time (sec) 9,024.27
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 7.762 17,852.992
    Background (sky+dark) 213.862 491,883.44

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength:
Grating: [G140L] R ~ 1000
Aperture: 52X0.1
Glow region: low


Target: [extended source]
Source diameter (arcsec): 0.07
Spectrum: Standard HST Star Spectra Solar Spectrum (G2V, -26.75) [1195.0, 26957.4 Å]
Extinction E(B-V): None
Normalization: Flux 1.88e-12 flam at 2000.0 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