ETC Request ID: COS.sp.664803

Requested Signal/Noise Ratio = 1.280 at wavelength 1325.00 Å (per resolution element)

gives: Time = 20,636.4466 seconds


Table of Source and Noise Counts per Pixel

Plots

Detailed Information Count rate Total counts Associated noise
(counts/s) (counts) (counts)
Counts (box 57 pixels high) (1 pix x pix) (6 pix resel x pix)
    Source 6.194e-05 7.67 2.77
    Background 2.280e-04 28.23 5.31
        Sky 2.639e-11 3.27e-06 1.81e-03
        Dark Current 2.280e-04 28.23 5.31
Total in selected region 2.899e-04 35.90 5.99
Brightest Pixel (single exposure) (at 1297.32 Å) 0.005 98.01
  Brightest Pixel in Segment A (at 1297.32 Å) 0.005
  Brightest Pixel in Segment B (at 1195.37 Å) 1.060e-05
Count rate entire detector 146.325
    Count rate Segment A 79.665
    Count rate Segment B 66.661
Buffer Fill Time (sec) 16,121
For APT purposes, the recommended buffer time is 2/3 of the buffer fill time calculated above. Please refer to Chapter 5.4 in the COS Instrument Handbook for more details.
Encircled energy fraction 1.00

Instrument name: COS
Mode: spectroscopic
Detector: FUV
Central Wavelength: 1280
Grating: [G140L] Grating (R ~ 2000 - 5,000)
Aperture: Primary Science Aperture


Target: [point source]
Spectrum: Flat in units of Fλ
Extinction E(B-V): None
Normalization: Flux 1e-17 flam at 1310.0 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