ETC Request ID: COS.sp.639851

Exposure time (seconds) = 900.0000 at wavelength 1310.00 Å

gives: SNR = 28.6496 (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 35 pixels high) (1 pix x pix) (6 pix resel x pix)
    Source 0.152 821.57 28.66
    Background 1.435e-04 0.77 0.88
        Sky 4.865e-12 2.63e-08 1.62e-04
        Dark Current 1.435e-04 0.77 0.88
Total in selected region 0.152 822.35 28.68
Brightest Pixel (single exposure) (at 1216.20 Å) 0.132 119.09
  Brightest Pixel in Segment A (at 1309.01 Å) 0.020
  Brightest Pixel in Segment B (at 1216.20 Å) 0.132
Count rate entire detector 4,638.743
    Count rate Segment A 1,943.385
    Count rate Segment B 2,695.359
Buffer Fill Time (sec) 508
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: 1309
Grating: [G130M] Grating (R ~ 20,000 - 24,000)
Aperture: Primary Science Aperture


Target: [point source]
Spectrum: Flat in units of Fλ
Extinction E(B-V): None
Normalization: Flux 1.22e-13 flam at 1180.0 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 22.2