Table 2
Summary of the observations.
| Obs. date | Tel. | Filter | texp | Nimg | V | α | v | Air Mass | Seeing | |
|---|---|---|---|---|---|---|---|---|---|---|
| (UTC) | (s) | (mag) | (deg) | (arcsec s–1) | (arcsec) | |||||
| 2025 Jan. 04 | 15:23:43–16:02:39 | Seimei | ɡ, r, i | 100 | 22 | 19.1 | 26.8 | 0.13 | 1.04–1.04 | 2.7 |
| 16:14:35–16:53:00 | Seimei | ɡ, r, ɀ | 100 | 19 | 19.1 | 26.7 | 0.14 | 1.05–1.07 | 2.8 | |
| 17:01:18–17:39:44 | Seimei | ɡ, r, i | 100 | 20 | 19.1 | 26.7 | 0.14 | 1.08–1.13 | 2.9 | |
| 2025 Jan. 07 | 16:49:28–17:47:58 | Seimei | ɡ, r, i | 100 | 29 | 18.8 | 19.4 | 0.15 | 1.08–1.20 | 3.3 |
| 2025 Jan. 10 | 15:13:50–16:00:38 | Seimei | ɡ, r, ɀ | 200 | 14 | 18.7 | 14.4 | 0.14 | 1.01–1.05 | 3.0 |
| 16:07:56–16:54:44 | Seimei | ɡ, r, ɀ | 200 | 10 | 18.7 | 14.4 | 0.14 | 1.06–1.14 | 3.1 | |
| 2025 Jan. 16 | 08:44:49–08:47:29 | Keck I | Y | 30 | 5 | 18.9 | 18.5 | 0.12 | 1.01–1.01 | 0.9 |
| 08:50:56–08:53:53 | Keck I | J | 30 | 5 | 18.9 | 18.5 | 0.12 | 1.00–1.00 | 0.9 | |
| 08:55:33–08:58:17 | Keck I | Y | 30 | 5 | 18.9 | 18.5 | 0.12 | 1.00–1.00 | 0.9 | |
| 08:59:38–09:05:20 | Keck I | H | 30 | 5 | 18.9 | 18.5 | 0.12 | 1.00–1.00 | 0.9 | |
| 2025 Jan. 17 | 09:13:43–09:16:26 | Keck I | Y | 30 | 5 | 19.0 | 20.6 | 0.12 | 1.00–1.00 | 0.6 |
| 09:24:17–09:27:58 | Keck I | K | 30 | 5 | 19.0 | 20.6 | 0.12 | 1.00–1.01 | 0.6 |
Notes. Observation time in UT in midtime of exposure (Obs. Date), telescope (Tel.), filters (Filter), total exposure time per frame (texp), and the number of images (Nimg) are listed. Predicted V band apparent magnitude (V), phase angle (α), and apparent angular rate of 2024 PT5 (v) at the observation starting time are referred to NASA Jet Propulsion Laboratory (JPL) Horizons as of July 08, 2025. Elevations of 2024 PT5 to calculate air mass range (Air Mass) are also referred to NASA JPL Horizons. Seeing FWHMs (Seeing) in the r band for Seimei observations and in the Y, J, H, and K bands for Keck observations measured by computing the FWHMs of reference stars are also listed.
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