The predicted exposure time or signal-to-noise ratio (SNR) for the object being observed appears below. The background at the position of the object being observed is estimated from the sum of the diffuse galactic emission in that region, as described in Schlegel et al. (1998), ApJ, 500, 525, and the zodiacal light emission, as described in table 17 in Leinert et al. (1998), A&AS, 127, 1. The zodiacal light emission will vary throughout the year, but for the purposes of the background estimation in the ETC the minimum value over a one year period is used. As a result, the background component reported by the ETC should be considered optimistic.
Observation Position: RA=215.0833 DEC= 3.9338  (J2000)

Source (in red) and background (in blue) photon counts per 5 Å bin. GALEX does slitless spectroscopy. The background value that is subtracted from each wavelength pixel is the integral of the plotted background over the bandpass.
Observation Position: RA=215.0833 DEC= 3.9338  (J2000)

True source (in red) and noisy source (in blue) spectrum in flux units.
Observation Position: RA=215.0833 DEC= 3.9338  (J2000)

Spectroscopic signal-to-noise ratio (SNR) (in red) per 5 Å bin.
Observation Position: RA=215.0833 DEC= 3.9338  (J2000)