Table 4
Flux densities and uncertainties at 20.0 μm based on measured Q-band magnitudes from Brown et al. (1982) and re-calibrated via the reference standard star αBoo.
| Object | MJD | rhelio | Δobs | α | ang-sep | f20 |
|---|---|---|---|---|---|---|
| (AU) | (AU) | (deg) | (′′) | (Jy) | ||
| Ariel (UI) [701] | 45 111.50 | 18.879 | 17.867 | 0.09 | 14.65 | 0.142 ± 0.026 |
| Umbriel (UII) [702] | 45 109.33 | 18.879 | 17.869 | 0.21 | 19.86 | 0.131 ± 0.018 |
| Titania (UIII) [703] | 45 109.50 | 18.879 | 17.868 | 0.20 | 33.31 | 0.250 ± 0.024 |
| Oberon (UIV) [704] | 45 108.40 | 18.880 | 17.871 | 0.26 | 43.23 | 0.280 ± 0.038 |
Notes. Data were taken in May 1982 with the IRTF (Miranda was not part of the study). rhelio is the light-time corrected heliocentric range, Δobs is the range of target centre wrt. the observer, i.e. IRTF, α is the phase angle and “ang-sep” is the apparent angular separation from Uranus. The aspect angle during the measurements was around 163.5° which means that IRTF saw mainly the South-pole region of Uranus and the four satellites.
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