ETC Request ID: STIS.sp.847746

Exposure time (seconds) = 3,000.0000 at wavelength 1216.00 Å

gives: SNR = 0.0000 (per resolution element)

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Zero target flux at the observation wavelength


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 0.000e+00 0.00e+00 0.00e+00
    Background 0.001 6.30 2.51
        Sky 2.478e-13 1.49e-09 3.86e-05
        Dark Current 0.001 6.30 2.51
Total in selected region 0.001 6.30 2.51
Brightest Pixel (single exposure) (at 1215.70 Å) 0.005 16.46
Count rate entire detector 170.407
Buffer Time (sec) 11,736.58
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 0.000e+00 0.000e+00
    Background (sky+dark) 170.407 511,222.36
Encircled energy fraction 0.76

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength: 1222
Grating: [G140M] R ~ 10000
Aperture: 52X0.05
Glow region: low


Target: [point source]
Spectrum: Pickles Models M4V 3111.72K
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 9.092 in filter Bessell/H
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