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Hartwig found 7 NGC-objects while working at Strassbourg Observatory during his observations of comet d'Arrest 1883; 5 were new. The galaxy NGC 5405 in Bootes was found with the 6.75" Repsold comet seeker. The position was subsequently measured with the 18" Merz refractor (erected in 1880).The 5 Virgo were seen with the 18-inch (NGC 5171 and NGC 5179 were discovered by Hough and Burnham). Swift and Hartwig are noted as discoverer for the galaxy NGC 6508 in Draco, but Hartwig was first; Swift followed two years later with the 16" refractor at Warner Observatory.
| D | N | NI | Y | M | D | Ap | I | T | Discoverer | Observer | Con | Type | S | Author | Title | Source | List |
| N | 5171 | 1883 | 6 | 29 | 18,0 | Rr | v | Hough 5.5.1883 | Tempel 11.5.1883 | VIR | E-S0 | 1 | Hartwig, E. | Neue Nebel | AN [2688] 112, 407 (1885) | 3 | |
| 1 | N | 5176 | 1883 | 6 | 29 | 18,0 | Rr | v | VIR | E0 | 1 | Hartwig, E. | Neue Nebel | AN [2688] 112, 407 (1885) | 4 | ||
| 1 | N | 5177 | 1883 | 6 | 29 | 18,0 | Rr | v | VIR | S? | 1 | Hartwig, E. | Neue Nebel | AN [2688] 112, 407 (1885) | 5 | ||
| N | 5179 | 1883 | 6 | 29 | 18,0 | Rr | v | Burnham 5.5.1883 | Tempel 11.5.1883 | VIR | S? | 1 | Hartwig, E. | Neue Nebel | AN [2688] 112, 407 (1885) | 4 | |
| 1 | N | 5186 | 1883 | 6 | 29 | 18,0 | Rr | v | VIR | S | 1 | Hartwig, E. | Neue Nebel | AN [2688] 112, 407 (1885) | 1 | ||
| 1 | N | 5405 | 1883 | 3 | 3 | 6,8 | Rr | v | BOO | Sc | 1 | Hartwig, E. | Auffindung eines neuen Nebels | AN [2507] 105, 173 (1883) | |||
| 1 | N | 6508 | 1883 | 9 | 19 | 18,0 | Rr | v | Swift L. 17.6.1884 | DRA | E0 | 1 | Hartwig, E. | Beobachtungen von neuen Nebeln | AN [2544] 106, 381 (1883) |
Obituary: AN 219, 186 (1923)
