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Table 1
Observing circumstances.
| UT date | r | Δ | Vr | VΔ | Exp. | M |
|
|
||||||
| 23 Dec. 6h37 | 0.812 | 0.918 | 0.41 | 33.68 | 1200 | 3.4 |
| 23 Dec. 6h57 | 0.812 | 0.918 | 0.42 | 33.68 | 1200 | 2.8 |
| 23 Dec. 7h15 | 0.812 | 0.918 | 0.43 | 33.69 | 925 | 2.4 |
| 24 Dec. 6h34 | 0.812 | 0.937 | 1.19 | 33.41 | 900 | 3.5 |
| 24 Dec. 6h52 | 0.812 | 0.937 | 1.20 | 33.41 | 1200 | 2.9 |
| 24 Dec. 7h12 | 0.812 | 0.938 | 1.21 | 33.41 | 1200 | 2.4 |
| 25 Dec. 6h41 | 0.813 | 0.957 | 1.96 | 33.10 | 900 | 3.2 |
| 25 Dec. 6h59 | 0.813 | 0.957 | 1.97 | 33.11 | 1200 | 2.7 |
| 25 Dec. 7h17 | 0.813 | 0.957 | 1.98 | 33.11 | 1000 | 2.3 |
| 26 Dec. 6h33 | 0.815 | 0.976 | 2.73 | 32.77 | 900 | 3.6 |
| 26 Dec. 6h51 | 0.815 | 0.976 | 2.74 | 32.77 | 1200 | 2.9 |
| 26 Dec. 7h12 | 0.815 | 0.976 | 2.75 | 32.78 | 1200 | 2.4 |
Notes. r: heliocentric distance (au); Δ: geocentric distance (au); Vr: heliocentric velocity (km s-1); VΔ: geocentric velocity (km s-1); Exp.: exposition time (s); M: airmass. The UT date corresponds to the mid-exposure time, and the airmass is also computed for mid-exposure.
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