ETC Request ID: STIS.sp.1305883

Exposure time (seconds) = 0.7000 at wavelength 4451.00 Å

gives: SNR = 628.7075 (per resolution element)

gives: Time to Saturation (for a single exposure) = 0.21 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: CCD Full Well limits: total counts per native pixel 54663.5 exceeds bright limit 33000 for selected gain

WARNING MESSAGE: "Electrons per pixel due to background (0.009) 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 283,080.367 396,312.51 629.53
    Background 0.183 0.26 0.51
        Sky 0.008 0.01 0.10
        Dark Current 0.175 0.24 0.49
    Read Out 32.28
Total in selected region 283,080.549 396,312.77 630.36
Brightest Pixel (single exposure) (at 5305.70 Å) 156,181.498 54,663.52
Global Count Rates
    Source only 235,904,802.885 165,133,362.020
    Background (sky+dark) 27,022.385 18,915.67
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength:
Grating: [G430L] R ~ 500
Aperture: 52X2
Gain: 1.0
# Frames: 2
Binning: dispersion: 1, spatial: 1
Dark: medium


Target: [point source]
Spectrum: User uploaded spectrum: Full_moon.txt
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 3.48 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 26.2