Table 3
Spectroscopic plates and resulting N2/CO ratios when this ratio can be computed.
| Plate | Date | Observer | Start time | End time | Exposure time | Elevation (°) | rh (au) | ṙh (kms−1) | Δ (au) |  (km s−1 ) |
N2+/CO+ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 18-10-1908 | BP & B | 18h37 | 23h12 | 3h57 | 84 | 1.49 | −20.87 | 1.04 | 4.37 | – |
| 2 | 30-10-1908 | D & B | – | – | 1h36 | 61 | 1.35 | −19.85 | 1.13 | 21.06 | 0.079 |
| 3 | 31-10-1908(*) | BP & B | 18h13 | 23h01 | 7h01 | 58 | 1.34 | −19.73 | 1.14 | 22.06 | 0.077 |
| 1-11-1908(*) | BP & B | 18h18 | 20h21 | 55 | 1.34 | −19.73 | 1.14 | 22.06 | |||
| 4 | 28-11-1908 | D&B | – | – | 1h17 | 19 | 1.06 | −13.48 | 1.59 | 28.21 | 0.072 |
Notes. (*)This observation was the combination of two nights, 31 October and 1 November 1908. BP & B: de la Baume Pluvinel & Baldet at the Juvisy Observatory (de La Baume Pluvinel & Baldet 1911). D & B: Deslandres & Bernard at the Meudon Observatory (Deslandres 1908). Times are given in GMT. Elevation is given for the start of the observation time. For those for which the observation time was not noted, the elevation is given for 19h.
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