ETC Request ID: STIS.sp.1430903

Requested Signal/Noise Ratio = 100.000 at wavelength 1400.00 Å (per resolution element)

gives: Time = 1,018.9465 seconds


Table of Source and Noise Counts per Pixel

Plots

Detailed Information Count rate Total counts Associated noise
(counts/s) (counts) (counts)
Counts (box 11 pixels high) (1 pix x 11 pix) (2 pix resel x 11 pix)
    Source 4.909 10,003.36 100.02
    Background 0.002 3.36 1.83
        Sky 3.758e-11 7.66e-08 2.77e-04
        Dark Current 0.002 3.36 1.83
Total in selected region 4.910 10,006.72 100.03
Brightest Pixel (single exposure) (at 1319.70 Å) 1.698 1,729.97
Count rate entire detector 5,438.873
Buffer Time (sec) 367.72
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 4,153.573 4,232,268.287
    Background (sky+dark) 1,285.300 1,309,651.81
Encircled energy fraction 0.72

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength:
Grating: [G140L] R ~ 1000
Aperture: 52X2
Glow region: low


Target: [point source]
Spectrum: Pickles Models B5-7V 14125.4K
Extinction E(B-V): Milky Way CCM (Rv=4.0) = 0.41 applied before normalization
Normalization: Renormalized to vegamag = 11.51 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 28.1