Historical known populations of solar system objects

by Wm. Robert Johnston
last updated 20 April 2015

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 satellites
1800 0 0 1 157 14 0 0 0 0
1810 4 4 1 166 14 0 0 0 0
1820 4 4 4 182 14 0 0 0 0
1830 4 4 5 198 14 0 0 0 0
1840 4 4 5 205 14 0 0 0 0
1850 10 10 10 237 16 0 0 0 0
1860 57 57 15 267 18 0 0 0 0
1870 109 109 18 295 18 0 0 0 0
1880 211 211 19 321 20 0 0 0 0
1890 287 287 26 380 20 0 0 0 0
1900 451 451 31 422 22 1 0 0 0
1910 719 (700) 35 475 25 1 0 0 0
1920 959 (900) 39 510 26 3 0 0 0
1930 1,269 (1,150) 49 539 26 5 0 0 0
1940 1,916 (1,450) 56 572 28 9 1 0 0
1950 2,115 (1,580) 68 624 30 13 1 0 0
1960 2,327 (1,630) 75 672 31 20 1 0 0
1970 4,461 (1,700) 82 719 32 27 1 0 0
1980 9,551 2,200 102 800 39 52 2 1 0
1981 11,078 2,321 105 810 45 55 2 1 0
1982 11,463 2,525 107 819 45 60 2 1 0
1983 11,707 2,818 108 821 45 70 2 1 0
1984 11,987 2,987 113 835 45 77 2 1 0
1985 12,344 3,166 118 851 45 81 2 1 0
1986 12,750 3,357 121 857 46 86 2 1 0
1987 13,149 3,533 129 870 56 95 2 1 0
1988 13,941 3,720 132 888 56 106 2 1 0
1989 14,825 3,956 134 903 56 115 2 1 0
1990 16,057 4,295 140 923 62 133 2 1 0
1991 17,548 4,679 146 934 63 158 2 1 0
1992 18,999 5,012 154 953 63 198 2 1 0
1993 21,415 5,408 157 965 63 228 4 2 0
1994 23,626 5,791 160 998 63 269 10 2 0
1995 27,554 6,202 1631,010 63 316 22 2 2
1996 29,039 6,752 1641,015 63 348 41 2 2
1997 32,526 7,367 1651,069 63 393 58 3 2
1998 36,426 8,125 1661,175 65 446 77 3 5
1999 46,445 9,826 1701,287 65 650 124 4 7
2000 58,282 12,971 1751,418 69 877 271 6 9
2001108,066 19,910 1821,544 91 1,239 444 22 13
2002158,311 32,729 1951,695105 1,680 609 35 23
2003208,572 52,224 2051,879110 2,166 797 54 33
2004232,470 73,636 2112,079138 2,604 991 82 47
2005264,447 96,154 2202,305154 3,1401,157115 59
2006305,224 120,437 2232,532157 3,7671,270139 87
2007362,447 145,705 2242,737165 4,4051,364184107
2008395,305 173,116 2262,969169 5,0541,424200150
2009436,598 202,885 2283,203170 5,8561,449223172
2010477,010 229,914 2333,437171 6,6371,500226191
2011540,573 257,455 2483,726173 7,5531,569230200
2012573,294 310,376 2563,991176 8,4511,599252215
2013600,853 350,441 2764,283178 9,4451,619265226
2014627,950 382,394 2945,02117910,4791,641270251
2015670,444 415,688 3065,20017911,9571,799297263
Apr 2015685,057433,9373125,38417912,4471,815300270
yearall minor planetsnumbered minor planetsnumbered cometsall cometsplanetary satellitesnear-Earth asteroidsall trans-Neptunian objects and centaursnumbered trans-Neptunian objects and centaursminor planet satellites


© 2007-2014, 2015 by Wm. Robert Johnston.
Last modified 20 April 2015.
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