ETC Request ID: STIS.sp.824002

Exposure time (seconds) = 1,000.0000 at wavelength 2500.00 Å

gives: SNR = 14.5702 (per resolution element)

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Partial overlap between instrument throughput band and target spectrum. Please doublecheck the wavelength range covered by the selected spectrum, and the instrument documentation for the selected filter.


Table of Source and Noise Counts per Pixel

Plots

Detailed Information Count rate Total counts Associated noise
(counts/s) (counts) (counts)
Counts (box 2 pixels high) (1 pix x pix) (2.0 pix resel x pix)
    Source 0.109 218.13 14.77
    Background 0.003 6.00 2.45
        Sky 2.275e-07 4.55e-04 0.02
        Dark Current 0.003 6.00 2.45
Total in selected region 0.112 224.13 14.97
Brightest Pixel (single exposure) (at 2905.60 Å) 0.717 717.42
Count rate entire detector 2,255.352
Buffer Time (sec) 886.78
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 680.759 680,758.840
    Background (sky+dark) 1,574.593 1,574,593.17

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Central Wavelength:
Grating: [G230L] R ~ 500
Aperture: 52X0.2


Target: [extended source]
Source diameter (arcsec): 0.15
Spectrum: User uploaded spectrum: PsycheSTISETC.txt
Extinction E(B-V): None
Normalization: None
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