ETC Request ID: STIS.sp.1314354

Exposure time (seconds) = 30.0000 at wavelength 5006.40 Å

gives: SNR = 222.5645 (per resolution element)

gives: Time to Saturation (for a single exposure) = 346.55 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: "Electrons per pixel due to background (0.26) 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 7 pix) (2 pix resel x 7 pix)
    Source 872.491 52,349.47 228.80
    Background 0.182 10.94 3.31
        Sky 2.505e-04 0.02 0.12
        Dark Current 0.182 10.92 3.30
    Read Out 54.44
Total in selected region 872.673 52,360.41 235.21
Brightest Pixel (single exposure) (at 5006.44 Å) 346.270 3,462.70
Global Count Rates
    Source only 5,504.100 165,122.991
    Background (sky+dark) 27,300.202 819,006.05
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength: 4961
Grating: [G430M] R ~ 6000
Aperture: 52X0.5
Gain: 4.0
# Frames: 3
Binning: dispersion: 1, spatial: 1
Dark: medium


Target: [point source]
Spectrum: Black body at 130000.0K
Extinction E(B-V): None
Normalization: Flux 1.5e-15 flam at 4995.0 Å
Redshift: None
Emission Lines:
Line at Center 5006.4 Å    FWHM 1.05 Å   Flux 3.3e-12 Fλ
Line at Center 4958.4 Å    FWHM 1.05 Å   Flux 1.08e-12 Fλ


Selected background:
  Sky Background:
    Level:

Table of Source and Noise Counts per Pixel

Plots

These results were computed using: ETC version 27.1