ETC Request ID: STIS.sp.664744

Requested Signal/Noise Ratio = 2.000 at wavelength 1325.00 Å (per resolution element)

gives: Time = 19,137.6278 seconds


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 3.876e-04 14.84 3.85
    Background 0.001 40.19 6.34
        Sky 4.180e-12 1.60e-07 4.00e-04
        Dark Current 0.001 40.19 6.34
Total in selected region 0.001 55.02 7.42
Brightest Pixel (single exposure) (at 1221.30 Å) 0.012 229.05
Count rate entire detector 447.325

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 0.249 4,774.308
    Background (sky+dark) 447.076 8,555,968.01

Encircled energy fraction 0.81


Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength:
Grating: [G140L] R ~ 1000
Aperture: 52X0.5
Glow region:


Target: [point source]
Spectrum: Flat in units of Fλ
Extinction E(B-V): None
Normalization: Flux 1e-17 flam at 1300.0 Å
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Earth Shine: Average
    Zodiacal Light: Average
    Air Glow: Average

Table of Source and Noise Counts per Pixel


Plots

These results were computed using: ETC version 23.1