ETC Request ID: STIS.sp.827583

Exposure time (seconds) = 206.0000 at wavelength 4400.00 Å

gives: SNR = 530.0312 (per resolution element)

gives: Time to Saturation (for a single exposure) = 322.87 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: "Electrons per pixel due to background (4.1) is less than the recommended threshold of 20 electrons to avoid poor charge transfer efficiency (CTE). We suggest you consider CTE mitigation strategies described in the STIS Instrument Handbook."


Table of Source and Noise Counts per Pixel

Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box 7 pixels high) (1 pix x pix) (2.0 pix resel x pix)
    Source 684.462 281,998.29 531.04
    Background 0.140 57.80 7.60
        Sky 0.007 3.00 1.73
        Dark Current 0.133 54.80 7.40
    Read Out 31.80
Total in selected region 684.602 282,056.08 532.04
Brightest Pixel (single exposure) (at 5070.80 Å) 371.665 76,562.93
Global Count Rates
    Source only 603,137.705 124,246,367.291
    Background (sky+dark) 20,731.853 4,270,761.67
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength:
Grating: [G430L] R ~ 500
Aperture: 52X2
Gain: 4.0
# Frames: 1
Binning: dispersion: 1, spatial: 1
Dark:


Target: [point source]
Spectrum: Castelli-Kurucz Models G2V 5750 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 10.809 in filter Johnson/B
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