ETC Request ID: STIS.sp.1385519

Exposure time (seconds) = 251.0000 at wavelength 5008.00 Å

gives: SNR = 183.6531 (per resolution element)

gives: Time to Saturation (for a single exposure) = 1,214.62 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: "Electrons per pixel due to background (6.7) 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 68.395 34,334.24 185.30
    Background 0.191 95.71 9.78
        Sky 0.009 4.35 2.09
        Dark Current 0.182 91.36 9.56
    Read Out 22.82
Total in selected region 68.586 34,429.95 186.95
Brightest Pixel (single exposure) (at 5008.70 Å) 27.169 6,819.40
Global Count Rates
    Source only 7,185.025 1,803,441.234
    Background (sky+dark) 28,067.366 7,044,908.98
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength:
Grating: [G430L] R ~ 500
Aperture: 52X2
Gain: 1.0
# Frames: 1
Binning: dispersion: 1, spatial: 1
Dark: medium


Target: [point source]
Spectrum: Kurucz Models A1V 9230 4.1
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 15.4 in filter Johnson/V
Redshift: None
Emission Lines:
Line at Center 5008.24 Å    FWHM 8.5 Å   Flux 2.1e-13 Fλ
Line at Center 4960.3 Å    FWHM 8.5 Å   Flux 7e-14 Fλ


Selected background:
  Sky Background:
    Level:

Table of Source and Noise Counts per Pixel

Plots

These results were computed using: ETC version 27.2