ETC Request ID: STIS.sp.1040152

Exposure time (seconds) = 2,160.0000 at wavelength 5008.00 Å

gives: SNR = 507.1265 (per resolution element)

gives: Time to Saturation (for a single exposure) = 1,068.00 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: "Electrons per pixel due to background (9.8) 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 2 pixels high) (1 pix x 2 pix) (2 pix resel x 2 pix)
    Source 59.710 257,946.60 507.88
    Background 0.036 156.56 12.51
        Sky 2.405e-04 1.04 1.02
        Dark Current 0.036 155.52 12.47
    Read Out 24.80
Total in selected region 59.746 258,103.16 508.64
Brightest Pixel (single exposure) (at 5008.70 Å) 30.899 16,685.43
Global Count Rates
    Source only 1,782.862 3,850,982.998
    Background (sky+dark) 18,955.825 40,944,581.53

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength:
Grating: [G430L] R ~ 500
Aperture: 52X0.2
Gain: 1.0
# Frames: 4
Binning: dispersion: 1, spatial: 1
Dark: medium


Target: [extended source]
Source diameter (arcsec): 0.2
Spectrum: Kurucz Models F0V 7200 4.3
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 16.0 in filter Johnson/V
Redshift: None
Emission Lines:
Line at Center 5008.24 Å    FWHM 25.0 Å   Flux 3e-11 Fλ
Line at Center 4960.295 Å    FWHM 25.0 Å   Flux 1e-11 Fλ
Line at Center 4862.71 Å    FWHM 25.0 Å   Flux 1e-11 Fλ


Selected background:
  Sky Background:
    Level:

Table of Source and Noise Counts per Pixel

Plots

These results were computed using: ETC version 25.2