ETC Request ID: STIS.sp.1327422

Exposure time (seconds) = 2,704.0000 at wavelength 1216.00 Å

gives: SNR = 115.9598 (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 7 pixels high) (1 pix x 7 pix) (2 pix resel x 7 pix)
    Source 2.487 13,452.35 115.98
    Background 0.001 5.68 2.38
        Sky 2.731e-08 1.48e-04 0.01
        Dark Current 0.001 5.68 2.38
Total in selected region 2.489 13,458.03 116.01
Brightest Pixel (single exposure) (at 1215.45 Å) 1.108 2,995.17
Count rate entire detector 303.275
Buffer Time (sec) 6,594.67
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 70.126 189,620.813
    Background (sky+dark) 233.149 630,435.63
Encircled energy fraction 0.76

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength: 1222
Grating: [G140M] R ~ 10000
Aperture: 52X0.2
Glow region: low


Target: [point source]
Spectrum: User uploaded spectrum: rescaled_convolved_hd97334.dat
Extinction E(B-V): None
Normalization: Flux 1e-12 flam at 1216.0 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 27.1