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Table 1.
Observing log of the sample PNe.
| Name | RA | Dec | Exposures (a) |
|---|---|---|---|
| (J2000) | (J2000) | (s) | |
| PN1687* | 00 43 21.3 | +41 05 28.9 | 4 × 1622. |
| PN2068* | 00 40 49.6 | +40 39 46.5 | 4 × 1622. |
| PN2538* | 00 36 28.8 | +39 35 26.4 | 4 × 1640. |
| PN50* | 00 46 42.9 | +42 08 35.3 | 4 × 1640. |
| PN1596 | 00 39 22.6 | +41 06 57.3 | 4 × 1640. |
| PN2471 | 00 43 11.2 | +42 20 45.7 | 5 × 1308. |
| PN2860 | 00 38 55.0 | +41 06 55.3 | 5 × 1308. |
| PN1074 | 00 40 38.1 | +41 16 48.0 | 5 × 1308. |
| PN1675 | 00 43 15.2 | +41 04 21.5 | 4 × 1622. |
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