ETC Request ID: STIS.sp.716764

Exposure time (seconds) = 250.0000 at wavelength 2800.00 Å

gives: SNR = 16.8151 (per resolution element)


Table of Source and Noise Counts per Pixel

Plots

Detailed Information Count rate Total counts Associated noise
(counts/s) (counts) (counts)
Counts (box 7 pixels high) (1 pix x pix) (2.0 pix resel x pix)
    Source 0.587 293.63 17.14
    Background 0.011 5.25 2.29
        Sky 1.478e-08 7.39e-06 2.72e-03
        Dark Current 0.011 5.25 2.29
Total in selected region 0.598 298.88 17.46
Brightest Pixel (single exposure) (at 2910.53 Å) 2.529 632.33
Count rate entire detector 41,403.845
Buffer Time (sec)
For APT purposes, the recommended buffer time should be 4/5 of the buffer time calculated above. Please refer to the STIS Instrument Handbook for more details.
Global Count Rates
    Source only 32,382.889 8,095,722.156
    Background (sky+dark) 1,572.868 393,216.92
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Central Wavelength: 2707
Grating: [E230M] R ~ 30000
Aperture: 0.2X0.2


Target: [point source]
Spectrum: Kurucz Models G8V 5570 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 6.0 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 23.2