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Table 1.
Observing circumstances.
| Comet | Type | Date | rh | ṙh | Δ |
 |
d | w | h |
|---|---|---|---|---|---|---|---|---|---|
| (yyyy-mm-dd) | (au) | (km s−1) | (au) | (km s−1) | (″) | (″) | (″) | ||
| 46P/Wirtanen | JFC | 2018-12-09 | 1.06 | −1.2 | 0.09 | −5.3 | 0 | 0.44 | 9.5 |
| C/1996 B2 (Hyakutake) | EXT | 1996-03-26 | 1.02 | −36.7 | 0.11 | 18.3–20.8 | 0 | 0.87 | 7.4 |
| C/1996 B2 (Hyakutake) | EXT | 1996-03-26 | 1.02 | −36.7 | 0.11 | 18.3–20.8 | 2 | 0.87 | 7.4 |
Notes. rh and Δ are the heliocentric and geocentric distances. ṙh and 
are the corresponding velocities. d, w, and h refer to the offset of the slit with respect to the photocenter, the slit width, and the slit height, respectively. Type refers to the comet’s dynamical class.
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