Historical known populations of solar system objects

by Wm. Robert Johnston
last updated 25 December 2019

These plots show the historical growth in known populations of some solar system objects (note that the scale is logarithmic):

More details on the current totals are given at Known populations of solar system objects.


Summary of historical growth in known populations of some solar system objects

Figures below summarize data shown in the above plots. As possible, data corresponds to figures for the beginning of the year. Some data are approximate. Sources:

yearall minor planetsnumbered minor planetsnumbered cometsall cometsplanetary satellitesnear-Earth asteroidsall trans-Neptunian objects and centaursnumbered trans-Neptunian objects and centaursminor planet satellitesinterstellar objects
1800 0 0 1 183 14 0 0 0 00
1810 4 4 1 14 0 0 0 00
1820 4 4 4 14 0 0 0 00
1830 4 4 5 14 0 0 0 00
1840 4 4 5 14 0 0 0 00
1850 10 10 10 16 0 0 0 00
1860 57 57 15 18 0 0 0 00
1870 109 109 17 18 0 0 0 00
1880 211 211 18 20 0 0 0 00
1890 287 287 25 403 20 0 0 0 00
1900 451 451 30 22 1 0 0 00
1910 719 (670) 35 475 25 1 0 0 00
1920 959 914 39 26 3 0 0 00
1930 1,269 1,091 49 539 26 5 0 0 00
1940 1,916 1,453 28 9 1 0 00
1950 2,115 (1,580) 68 624 30 13 1 0 00
1960 2,327 (1,630) 75 672 31 20 1 0 00
1970 4,461 (1,700) 82 719 32 27 1 0 00
1980 9,251 2,188 102 800 39 51 2 1 00
1981 9,951 2,321 105 810 45 54 2 1 00
1982 11,078 2,525 107 819 45 61 2 1 00
1983 11,463 (2,800)108 821 45 71 2 1 00
1984 11,707 2,987 113 835 45 78 2 1 00
1985 11,987 3,166 118 851 45 82 2 1 00
1986 12,344 3,357 121 857 46 87 2 1 00
1987 12,750 3,533 129 870 56 96 2 1 00
1988 13,149 3,720 132 888 56 107 2 1 00
1989 13,941 3,956 134 903 56 116 2 1 00
1990 14,825 4,295 140 923 62 134 2 1 00
1991 16,057 4,679 146 934 63 159 2 1 00
1992 17,548 5,012 154 953 63 199 2 1 00
1993 18,999 5,408 157 965 63 229 4 2 00
1994 21,415 5,791 160 998 63 269 10 2 00
1995 23,626 6,202 1631,010 63 316 22 2 20
1996 29,039 6,752 1641,015 63 349 41 2 20
1997 32,526 7,367 1651,069 63 394 58 3 20
1998 36,426 8,125 1661,175 65 447 76 3 50
1999 46,445 9,826 1701,287 65 651 123 4 70
2000 58,282 12,971 1751,418 69 879 270 6 90
2001108,066 19,910 1821,544 91 1,242 442 22 130
2002158,311 32,729 1951,695105 1,684 606 35 230
2003208,572 52,224 2051,879110 2,172 794 54 330
2004232,470 73,636 2112,079138 2,610 989 82 470
2005264,447 96,154 2202,305154 3,1481,159115 590
2006305,224 120,437 2232,532157 3,7771,273139 840
2007362,447 145,705 2242,737165 4,4141,3731841040
2008395,305 173,116 2262,969169 5,0641,4472001470
2009436,598 202,885 2283,203170 5,8671,4772231700
2010473,217 228,203 2333,437171 6,6471,5322261890
2011540,573 257,455 2483,726173 7,5681,7632301980
2012573,294 310,376 2563,991176 8,4551,9582522130
2013600,853 350,441 2764,283178 9,4472,0652652240
2014627,950 382,394 2945,02117910,4782,4032702490
2015664,036 415,688 3065,20017911,9452,7182952620
2016701,660 455,144 17913,5053,4263222930
2017723,367 480,806 18115,3903,4944003090
2018746,412 508,765 362 18217,4423,5164683371
2019789,069 523,824 375 19419,2803,5286213601
Dec 2019 853,561 542,163 3936,61921421,6623,5427723932
yearall minor planetsnumbered minor planetsnumbered cometsall cometsplanetary satellitesnear-Earth asteroidsall trans-Neptunian objects and centaursnumbered trans-Neptunian objects and centaursminor planet satellitesinterstellar objects


© 2007-2018, 2019 by Wm. Robert Johnston.
Last modified 25 December 2019.
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