PLANETOIDS.
| Name. | Date of Discovery. | Discoverer. | Place of Discovery. | No. discovered by each astronomer. |
| Mercury, Mars, Venus, Jupiter, Earth, Saturn | Known to the ancients. | ... | ... | — |
| Uranus | 1781, March 13 | W. Herschel | Bath | — |
| Neptune[59] | 1846, Sept. 23 | Galle | Berlin | — |
| 1 Ceres | 1801, Jan. 1 | Piazzi | Palermo | 1 |
| 2 Pallas | 1802, March 28 | Olbers | Bremen | 1 |
| 3 Juno | 1804, Sept. 1 | Harding | Lilienthal | 1 |
| 4 Vesta | 1807, March 29 | Olbers | Bremen | 2 |
| 5 Astræa | 1845, Dec. 8 | Encke | Driesen | 1 |
| 6 Hebe | 1847, July 1 | Encke | Driesen | 2 |
| 7 Iris | 1847, August 13 | Hind | London | 1 |
| 8 Flora | 1847, Oct. 18 | Hind | London | 2 |
| 9 Metis | 1848, April 25 | Graham | Markree | 1 |
| 10 Hygeia | 1849, April 12 | Gasperis | Naples | 1 |
| 11 Parthenope | 1850, May 11 | Gasperis | Naples | 2 |
| 12 Victoria | 1850, Sept. 13 | Hind | London | 3 |
| 13 Egeria | 1850, Nov. 2 | Gasperis | Naples | 3 |
| 14 Irene | 1851, May 19 | Hind | London | 4 |
| 15 Eunomia | 1851, July 29 | Gasperis | Naples | 4 |
| 16 Psyche | 1852, March 17 | Gasperis | Naples | 5 |
| 17 Thetis | 1852, April 17 | Luther | Bilk | 1 |
| 18 Melpomene | 1852, June 24 | Hind | London | 5 |
| 19 Fortuna | 1852, August 22 | Hind | London | 6 |
| 20 Massilia | 1852, Sept. 19 | Gasperis | Naples | 6 |
| 21 Lutetia | 1852, Nov. 15 | Goldschmidt | Paris | 1 |
| 22 Calliope | 1852, Nov. 16 | Hind | London | 7 |
| 23 Thalia | 1852, Dec. 15 | Hind | London | 8 |
| 24 Themis | 1853, April 5 | Gasperis | Naples | 7 |
| 25 Phocea | 1853, April 6 | Chacornac | Marseilles | 1 |
| 26 Proserpine | 1853, May 5 | Luther | Bilk | 2 |
| 27 Euterpe | 1853, Nov. 8 | Hind | London | 9 |
| 28 Bellona | 1854, March 1 | Luther | Bilk | 3 |
| 29 Amphitrite | 1854, March 1 | Marth | London | 1 |
| 30 Urania | 1854, July 22 | Hind | London | 10 |
| 31 Euphrosyne | 1854, Sept. 1 | Furguson | Washington | 1 |
| 32 Pomona | 1854, Oct. 26 | Goldschmidt | Paris | 2 |
| 33 Polyhymnia | 1854, Oct. 28 | Chacornac | Paris | 2 |
| 34 Circe | 1855, April 6 | Chacornac | Paris | 3 |
| 35 Leucothea | 1855, April 19 | Luther | Bilk | 4 |
| 36 Atalante | 1855, Oct. 5 | Goldschmidt | Paris | 3 |
| 37 Fides | 1855, Oct. 5 | Luther | Bilk | 5 |
| 38 Leda | 1856, Jan. 12 | Chacornac | Paris | 4 |
| 39 Lætitia | 1856, Feb. 8 | Chacornac | Paris | 5 |
| 40 Harmonia | 1856, March 31 | Goldschmidt | Paris | 4 |
| 41 Daphne | 1856, May 22 | Goldschmidt | Paris | 5 |
| 42 Isis | 1856, May 23 | Pogson | Oxford | 1 |
| 43 Ariadne | 1857, April 15 | Pogson | Oxford | 2 |
| 44 Nysa | 1857, May 27 | Goldschmidt | Paris | 6 |
| 45 Eugenia | 1857, June 28 | Goldschmidt | Paris | 7 |
| 46 Hastia | 1857, August 16 | Pogson | Oxford | 3 |
| 47 Aglaia | 1857, Sept. 15 | Luther | Bilk | 6 |
| 48 Doris | 1857, Sept. 19 | Goldschmidt | Paris | 8 |
| 49 Pales | 1857, Sept. 19 | Goldschmidt | Paris | 9 |
| 50 Virginia | 1857, Oct. 4 | Furguson | Washington | 2 |
| 51 Nemausa | 1858, Jan. 22 | Laurent | Nismes | 1 |
| 52 Europa | 1858, Feb. 6 | Goldschmidt | Paris | 10 |
| 53 Calypso | 1858, April 8 | Luther | Bilk | 7 |
| 54 Alexandra | 1858, Sept. 11 | Goldschmidt | Paris | 11 |
| 55 (Not named) | 1858, Sept. 11 | Searle | Albany | 1 |