ETC Request ID: STIS.sp.825244

Exposure time (seconds) = 300.0000 at wavelength 1425.00 Å

gives: SNR = 11.1090 (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 0.240 143.82 11.99
    Background 0.001 0.63 0.79
        Sky 2.459e-18 1.48e-15 3.84e-08
        Dark Current 0.001 0.63 0.79
Total in selected region 0.241 144.45 12.95
Brightest Pixel (single exposure) (at 1320.42 Å) 0.129 38.63
Count rate entire detector 10,834.365
Buffer Time (sec) 184.60
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 6,431.974 1,929,592.157
    Background (sky+dark) 157.286 47,185.93
Encircled energy fraction 0.94

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength: 1425
Grating: [E140M] R ~ 45800
Aperture: 0.3X0.05ND
Glow region: low


Target: [point source]
Spectrum: Kurucz Models B1V 25400 3.9
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.04 applied before normalization
Normalization: Renormalized to vegamag = 4.33 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 24.2