Table 3
Extracted MIRI fluxes for the main-belt asteroid (10920) (in mJy) and the new faint asteroid (in μJy).
| MBA (10920) | New Object | |||||||
|---|---|---|---|---|---|---|---|---|
| No. | MJD | λ (μm) | flux (mJy) | error(a) (mJy) | Comments | flux (μJy) | error(a) (μJy) | Comments |
| 1 | 59774.434921 | 5.60 | 0.40 | 0.03 | L2 1-4 &L3 | 4.0 | 1.1 | low S/N |
| 2 | 59774.444966 | 7.70 | 3.89 | 0.27 | L2 5-8 & L3 | 25.9 | 3.4 | |
| 3 | 59774.455084 | 10.00 | 13.19 | 0.90 | L2 9-12 & L3 | 54.3 | 5.7 | |
| 4 | 59774.464526 | 11.30 | 20.14 | 1.48 | L2 13-16 & L3 | 79.7 | 9.0 | |
| 5 | 59774.473988 | 12.80 | 25.67 | 1.63 | L2 17-20 & L3 | 93.5 | 8.3 | |
| 6 | 59774.483560 | 15.00 | 35.83 | 2.15 | L2 21-24 & L3 | 121.3 | 7.5 | |
| 7 | 59774.493029 | 18.00 | 54.31 | 3.98 | L2 26-28 & L3 | 103.1 | 8.3 | high bgr |
| 8 | 59774.502468 | 21.00 | 77.63 | 8.79 | L2 30 & L3 | 91.8 | 24.4 | high bgr |
| 9 | 59774.512490 | 25.50 | – | – | out of FOV | 111.2 | 19.8 | high bgr |
Notes. The asteroid (10920) was at a heliocentric distance of r=3.5640au, a JWST-centric distance of 2.86328 au, a solar elongation of 125.87°, and seen under a phase angle α = 13.51° at observation mid-time (2022-Jul-14 11:20 UT). For the faint new asteroid, only its positions over 2h and the apparent motion are known (see Table 2). Both objects had a solar elongation (λ − λsun) = 125.8°, as seen from JWST.(a) The flux errors are standard deviations of the photometry of the four L2 images, combined with estimated errors for the color correction and absolute flux calibration.
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