Asteroids.Date of
Discovery.		Name of
Discoverer.		Place of
Discovery.
1. Ceres1801, Jan. 1PiazziPalermo
2. Pallas1802, Mar. 28OlbersBremen
3. Juno1804, Sept. 1HardingLilienthal
4. Vesta1807, Mar. 29OlbersBremen
5. Astræa1845, Dec. 8HenckeDriessen
6. Hebe1847, July 1HenckeDriessen
7. Iris1847, Aug. 14HindLondon
8. Flora1847, Oct. 18HindLondon
9. Metis1848, Apr. 26GrahamMarkree
10. Hygeia1849, Apr. 12De GasparisNaples
11. Parthenope1850, May 11De GasparisNaples
12. Victoria1850, Sept. 13HindLondon
13. Egeria1850, Nov. 2De GasparisNaples
14. Irene1851, May 19HindLondon
15. Eunomia1851, July 29De GasparisNaples
16. Psyche1852, Mar. 17De GasparisNaples
17. Thetis1852, Apr. 17LutherBilk
18. Melpomene1852, June 24HindLondon
19. Fortuna1852, Aug. 22HindLondon
20. Massalia1852, Sept. 19De GasparisNaples
21. Lutetia1852, Nov. 15GoldschmidtParis
22. Calliope1852, Nov. 16HindLondon
23. Thalia1852, Dec. 15HindLondon
24. Themis1853, Apr. 5De GasparisNaples
25. Phocea1853, Apr. 6ChacornacMarseilles
26. Proserpine1853, May 5LutherBilk
27. Euterpe1853, Nov. 8HindLondon
28. Bellona1854, Mar. 1LutherBilk
29. Amphitrite1854, Mar. 1MarthLondon
30. Urania1854, July 22HindLondon
31. Euphrosyne1854, Sept. 1FergusonWashington
32. Pomona1854, Oct. 26GoldschmidtParis
33. Polyhymnia1854, Oct. 28ChacornacParis
34. Circe1855, Apr. 6ChacornacParis
35. Leucothea1855, Apr. 19LutherBilk
36. Atalanta1855, Oct. 5GoldschmidtParis
37. Fides1855, Oct. 5LutherBilk
38. Leda1856, Jan. 12ChacornacParis
39. Lætitia1856, Feb. 8ChacornacParis
40. Harmonia1856, Mar. 31GoldschmidtParis
41. Daphne1856, May 22GoldschmidtParis
42. Isis1856, May 23PogsonOxford
43. Ariadne1857, Apr. 15PogsonOxford
44. Nysa1857, May 27GoldschmidtParis
45. Eugenia1857, June 27GoldschmidtParis
46. Hestia1857, Aug. 16PogsonOxford
47. Aglaia1857, Sept. 15LutherBilk
48. Doris1857, Sept. 19GoldschmidtParis
49. Pales1857, Sept. 19GoldschmidtParis
50. Virginia1857, Oct. 4FergusonWashington
51. Nemausa1858, Jan. 22LaurentNismes
52. Europa1858, Feb. 4GoldschmidtParis
53. Calypso1858, Apr. 4LutherBilk
54. Alexandra1858, Sept. 10GoldschmidtParis
55. Pandora1858, Sept. 10SearleAlbany
56. Melete1857, Sept. 9GoldschmidtParis
57. Mnemosyne1859, Sept. 22LutherBilk
58. Concordia1860, Mar. 24LutherBilk
59. Olympia1860, Sept. 12ChacornacParis
60. Echo1860, Sept. 16FergusonWashington
61. Danaë1860, Sept. 9GoldschmidtParis
62. Erato1860, Sept. 14Foerster and LesserBerlin
63. Ausonia1861, Feb. 10De GasparisNaples
64. Angelina1861, Mar. 4TempelMarseilles
65. Maximiliana1861, Mar. 8TempelMarseilles
66. Maia1861, Apr. 9TuttleCambridge, U.S.
67. Asia1861, Apr. 17PogsonMadras
68. Leto1861, Apr. 29LutherBilk
69. Hesperia1861, Apr. 29SchiaparelliMilan
70. Panopea1861, May 5GoldschmidtParis
71. Niobe1861, Aug. 13LutherBilk
72. Feronia1862, May 29Peters and SaffordClinton
73. Clytie1862, Apr. 7TuttleCambridge
74. Galatea1862, Aug. 29TempelMarseilles
75. Eurydice1862, Sept. 22PetersClinton
76. Freia1862, Oct. 21D'ArrestCopenhagen
77. Frigga1862, Nov. 12PetersClinton
78. Diana1863, Mar. 15LutherBilk
79. Eurynome1863, Sept. 14WatsonAnn Arbor
80. Sappho1864, May 2PogsonMadras
81. Terpsichore1864, Sept. 30TempelMarseilles
82. Alcmene1864, Nov. 27LutherBilk
83. Beatrix1865, Apr. 26De GasparisNaples
84. Clio1865, Aug. 25LutherBilk
85. Io1865, Sept. 19PetersClinton
86. Semele1866, Jan. 14TietjenBerlin
87. Sylvia1866, May 16PogsonMadras
88. Thisbe1866, June 15PetersClinton
89. Julia1866, Aug. 6StephanMarseilles
90. Antiope1866, Oct. 1LutherBilk
91. Ægina1866, Nov. 4BorellyMarseilles
92. Undina1867, July 7PetersClinton
93. Minerva1867, Aug. 24WatsonAnn Arbor
94. Aurora1867, Sept. 6WatsonAnn Arbor
95. Arethusa1867, Nov. 24LutherBilk
96. Ægle1868, Feb. 17CoggiaMarseilles
97. Clotho1868, Feb. 17CoggiaMarseilles
98. Ianthe1868, Apr. 18PetersClinton
99. Dike1868, May 28BorellyMarseilles
100. Hecate1868, July 11WatsonAnn Arbor
101. Helena1868, Aug. 15WatsonAnn Arbor
102. Miriam1868, Aug. 22PetersClinton
103. Hera1868, Sept. 7WatsonAnn Arbor
104. Clymene1868, Sept. 13WatsonAnn Arbor
105. Artemis1868, Sept. 16WatsonAnn Arbor
106. Dione1868, Oct. 10WatsonAnn Arbor
107. Camilla1868, Nov. 17PogsonMadras
108. Hecuba1869, Apr. 2LutherBilk
109. Felicitas1869, Oct. 9PetersClinton
110. Lydia1870, Apr. 19BorellyMarseilles
111. Ate1870, Aug. 14PetersClinton
112. Iphigenia1870, Sept. 19PetersClinton
113. Amalthea1871, Mar. 12LutherBilk
114. Cassandra1871, July 23PetersClinton
115. Thyra1871, Aug. 6WatsonAnn Arbor
116. Sirona1871, Sept. 8PetersClinton
117. Lomia1871, Sept. 12BorellyMarseilles
118. Peitho1872, Mar. 15LutherBilk
119. Althea1872, Apr. 3WatsonAnn Arbor
120. Lachesis1872, Apr. 10BorellyMarseilles
121. Hermione1872, May 12WatsonAnn Arbor
122. Gerda1872, July 31PetersClinton
123. Brunhilda1872, July 31PetersClinton
124. Alceste1872, Aug. 23PetersClinton
125. Liberatrix1872, Sept. 11Prosper HenryParis
126. Velleda1872, Nov. 5Paul HenryParis
127. Johanna1872, Nov. 5Prosper HenryParis
128. Nemesis1872, Nov. 25WatsonAnn Arbor
129. Antigone1873, Feb. 5PetersClinton
130. Electra1873, Feb. 17PetersClinton
131. Vala1873, May 24PetersClinton
132. Æthra1873, June 13WatsonAnn Arbor
133. Cyrene1873, Aug. 16WatsonAnn Arbor
134. Sophrosyne1873, Sept. 27LutherBilk
135. Hertha1874, Feb. 18PetersClinton
136. Austria1874, Mar. 18PalisaPola
137. Melibœa1874, Apr. 21PalisaPola
138. Tolosa1874, May 19PerrotinToulouse
139. Juewa1874, Oct. 10WatsonPekin
140. Siwa1874, Oct. 13PalisaPola
141. Lumen1875, Jan. 13Paul HenryParis
142. Polana1875, Jan. 28PalisaPola
143. Adria1875, Feb. 23PalisaPola
144. Vibilia1875, June 3PetersClinton
145. Adeona1875, June 3PetersClinton
146. Lucina1875, June 8BorellyMarseilles
147. Protogenea1875, July 10SchulhofVienna
148. Gallia1875, Aug. 7Prosper HenryParis
149. Medusa1875, Sept. 21PerrotinToulouse
150. Nuwa1875, Oct. 18WatsonAnn Arbor
151. Abundantia1875, Nov. 1PalisaPola
152. Atala1875, Nov. 2Paul HenryParis
153. Hilda1875, Nov. 2PalisaPola
154. Bertha1875, Nov. 4Prosper HenryParis
155. Scylla1875, Nov. 8PalisaPola
156. Xantippe1875, Nov. 22PalisaPola
157. Dejanira1875, Dec. 1BorellyMarseilles
158. Coronis1876, Jan. 4KnorreBerlin
159. Æmilia1876, Jan. 26Paul HenryParis
160. Una1876, Feb. 20PetersClinton
161. Athor1876, Apr. 19WatsonAnn Arbor
162. Laurentia1876, Apr. 21Prosper HenryParis
163. Erigone1876, Apr. 26PerrotinToulouse
164. Eva1876, July 12Paul HenryParis
165. Loreley1876, Aug. 9PetersClinton
166. Rhodope1876, Aug. 15PetersClinton
167. Urda1876, Aug. 28PetersClinton
168. Sibylla1876, Sept. 27WatsonAnn Arbor
169. Zelia1876, Sept. 28Prosper HenryParis
170. Maria1877, Jan. 10PerrotinToulouse
171. Ophelia1877, Jan. 13BorellyMarseilles
172. Baucis1877, Feb. 5BorellyMarseilles
173. Ino1877, Aug. 1BorellyMarseilles
174. Phædra1877, Sept. 2WatsonAnn Arbor
175. Andromache1877, Oct. 1WatsonAnn Arbor
176. Idunna1877, Oct. 14PetersClinton
177. Irma1877, Nov. 5Paul HenryParis
178. Belisana1877, Nov. 6PalisaPola
179. Clytemnestra1877, Nov. 11WatsonAnn Arbor
180. Garumna1878, Jan. 29PerrotinToulouse
181. Eucharis1878, Feb. 2CottenotMarseilles
182. Elsa1878, Feb. 7PalisaPola
183. Istria1878, Feb. 8PalisaPola
184. Deiopea1878, Feb. 28PalisaPola
185. Eunice1878, Mar. 1PetersClinton
186. Celuta1878, Apr. 6Prosper HenryParis
187. Lamberta1878, Apr. 11CoggiaMarseilles
188. Menippe1878, June 18PetersClinton
189. Phthia1878, Sept. 9PetersClinton
190. Ismene1878, Sept. 22PetersClinton
191. Kolga1878, Sept. 30PetersClinton
192. Nausicaa1879, Feb. 17PalisaPola
193. Ambrosia1879, Feb. 28CoggiaMarseilles
194. Procne1879, Mar. 21PetersClinton
195. Euryclea1879, Apr. 22PalisaPola
196. Philomela1879, May 14PetersClinton
197. Arete1879, May 21PalisaPola
198. Ampella1879, June 13BorellyMarseilles
199. Byblis1879, July 9PetersClinton
200. Dynamene1879, July 27PetersClinton
201. Penelope1879, Aug. 7PalisaPola
202. Chryseis1879, Sept. 11PetersClinton
203. Pompeia1879, Sept. 25PetersClinton
204. Callisto1879, Oct. 8PalisaPola
205. Martha1879, Oct. 13PalisaPola
206. Hersilia1879, Oct. 13PetersClinton
207. Hedda1879, Oct. 17PalisaPola
208. Lachrymosa1879, Oct. 21PalisaPola
209. Dido1879, Oct. 22PetersClinton
210. Isabella1879, Nov. 12PalisaPola
211. Isolda1879, Dec. 10PalisaPola
212. Medea1880, Feb. 6PalisaPola
213. Lilæa1880, Feb. 16PetersClinton
214. Aschera1880, Feb. 26PalisaPola
215. Œnone1880, Apr. 7KnorreBerlin
216. Cleopatra1880, Apr. 10PalisaPola
217. Eudora1880, Aug. 30CoggiaMarseilles
218. Bianca1880, Sept. 4PalisaPola
219. Thusnelda1880, Sept. 20PalisaPola
220. Stephania1881, May 19PalisaVienna
221. Eos1882, Jan. 18PalisaVienna
222. Lucia1882, Feb. 9PalisaVienna
223. Rosa1882, Mar. 9PalisaVienna
224. Oceana1882, Mar. 30PalisaVienna
225. Henrietta1882, Apr. 19PalisaVienna
226. Weringia1882, July 19PalisaVienna
227. Philosophia1882, Aug. 12Paul HenryParis
228. Agathe1882, Aug. 19PalisaVienna
229. Adelinda1882, Aug. 22PalisaVienna
230. Athamantis1882, Sept. 3De BallBothcamp
231. Vindobona1882, Sept. 10PalisaVienna
232. Russia1883, Jan. 31PalisaVienna
233. Asterope1883, May 11BorellyMarseilles
234. Barbara1883, Aug. 13PetersClinton
235. Caroline1883, Nov. 29PalisaVienna
236. Honoria1884, Apr. 26PalisaVienna
237. Cœlestina1884, June 27PalisaVienna
238. Hypatia1884, July 1KnorreBerlin
239. Adrastea1884, Aug. 18PalisaVienna
240. Vanadis1884, Aug. 27BorellyMarseilles
241. Germania1884, Sept. 12LutherDusseldorf
242. Kriemhild1884, Sept. 22PalisaVienna
243. Ida1884, Sept. 29PalisaVienna
244. Sita1884, Oct. 14PalisaVienna
245. Vera1885, Feb. 6PogsonMadras
246. Asporina1885, Mar. 6BorellyMarseilles
247. Eukrate1885, Mar. 14LutherDusseldorf
248. Lameia1885, June 5PalisaVienna
249. Ilse1885, Aug. 17PetersClinton
250. Bettina1885, Sept. 3PalisaVienna
251. Sophia1885, Oct. 4PalisaVienna
252. Clementina1885, Oct. 27PerrotinNice
253. Mathilde1885, Nov. 12PalisaVienna
254. Augusta1886, Mar. 31PalisaVienna
255. Oppavia1886, Mar. 31PalisaVienna
256. Walpurga1886, Apr. 3PalisaVienna
257. Silesia1886, Apr. 5PalisaVienna
258. Tyche1886, May 4LutherDusseldorf
259. Aletheia1886, June 28PetersClinton
260. Huberta1886, Oct. 3PalisaVienna
261. Prymno1886, Oct. 31PetersClinton
262. Valda1886, Nov. 3PalisaVienna
263. Dresda1886, Nov. 3PalisaVienna
264. Libussa1886, Dec. 17PetersClinton
265. Anna1887, Feb. 25PalisaVienna
266. Aline1887, May 17PalisaVienna
267. Tirza1887, May 27CharloisNice
268.1887, June 9BorellyMarseilles
269.1887, Sept. 21PalisaVienna
270.1887, Oct. 8PetersClinton
271.1887, Oct. 16KnorreBerlin

3. Remarks on Table I.

The numbers discovered by the thirty-five observers are respectively as follows:

Palisa60
Peters47
Luther23
Watson22
Borelly15
Goldschmidt14
Hind10
De Gasparis9
Pogson8
Paul Henry7
Prosper Henry7
Chacornac6
Perrotin6
Coggia5
Knorre4
Tempel4
Ferguson3
Olbers2
Hencke2
Tuttle2
Foerster (with Lesser)1
Safford (with Peters)1
and Messrs. Charlois, Cottenot, D'Arrest, De Ball, Graham, Harding, Laurent, Piazzi, Schiaparelli, Schulhof, Stephan, Searle, and Tietjen, each1

Before arrangements had been made for the telegraphic transmission of discoveries between Europe and America, or even between the observatories of Europe, the same planet was sometimes independently discovered by different observers. For example, Virginia was found by Ferguson, at Washington, on October 4, 1857, and by Luther, at Bilk, fifteen days later. In all cases, however, credit has been given to the first observer.

Hersilia, the two hundred and sixth of the group, was lost before sufficient observations were obtained for determining its elements. It was not rediscovered till December 14, 1884. Menippe, the one hundred and eighty-eighth, was also lost soon after its discovery in 1878. It has not been seen for more than nine years, and considerable uncertainty attaches to its estimated elements.

Of the two hundred and seventy-one members now known (1887), one hundred and ninety-one have been discovered in Europe, seventy-four in America, and six in Asia. The years of most successful search, together with the number discovered in each, were:

Asteroids.
187920
187517
186812
187812

And six has been the average yearly number since the commencement of renewed effort in 1845. All the larger members of the group have, doubtless, been discovered. It seems not improbable, however, that an indefinite number of very small bodies belonging to the zone remain to be found. The process of discovery is becoming more difficult as the known number increases. The astronomer, for instance, who may discover number two hundred and seventy-two must know the simultaneous positions of the two hundred and seventy-one previously detected before he can decide whether he has picked up a new planet or merely rediscovered an old one. The numbers discovered in the several months are as follows:

January 13
February 23
March 19
April 35
May 21
June 13
July 14
August 28
September 46
October 28
November 26
December 5