Table 1
Summary of the observations.
| Obs. date (UTC) | Tel. | Filter | texp (s) | Nimg | V (mag) | α (deg) | Δ (au) | rh (au) | Air mass |
|---|---|---|---|---|---|---|---|---|---|
| 2012 Aug. 16 13:20:34–13:46:44 | Subaru | W–J–VR | 90 | 13 | 24.4 | 72.3 | 0.357 | 1.062 | 1.21–1.30 |
| 2024 Feb. 13 12:59:10–13:49:24 | Seimei | g, r, i | 600 | 2 | 20.1 | 20.9 | 0.097 | 1.077 | 1.42–1.57 |
| 2024 Feb. 13 14:06:26–14:56:40 | Seimei | g, r, z | 600 | 6 | 20.1 | 20.9 | 0.097 | 1.077 | 1.37–1.40 |
Notes. The observation time in UT at the mid-time of exposure (Obs. date), telescope (Tel.), filters (Filters), total exposure time per frame (texp), and number of images (Nimg) are listed. The predicted V-band apparent magnitude (V), phase angle (α), distance between 2001 QJ142 and observer (Δ), and distance between 2001 QJ142 and the Sun (rh) at the observation starting time were taken from NASA JPL Horizons on June 16, 2024. Elevations of 2001 QJ142 used to calculate the air mass range (Air Mass) are also from NASA JPL Horizons.
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