ETC Request ID: STIS.sp.912588

Exposure time (seconds) = 12.0000 at wavelength 4300.00 Å

gives: SNR = 111.6548 (per resolution element)

gives: Time to Saturation (for a single exposure) = 67.82 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: "Electrons per pixel due to background (0.22) 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 541.097 12,986.33 113.96
    Background 0.126 3.03 1.74
        Sky 8.174e-05 1.96e-03 0.04
        Dark Current 0.126 3.02 1.74
    Read Out 23.20
Total in selected region 541.223 12,989.35 116.31
Brightest Pixel (single exposure) (at 5308.40 Å) 486.585 5,839.02
Global Count Rates
    Source only 740,314.280 8,883,771.363
    Background (sky+dark) 18,888.197 226,658.36
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength:
Grating: [G430L] R ~ 500
Aperture: 52X0.05
Gain: 1.0
# Frames: 1
Binning: dispersion: 1, spatial: 1
Dark: medium


Target: [point source]
Spectrum: Castelli-Kurucz Models K0V 5250 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 8.94 in filter Johnson/V
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 25.1.1