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NEO Discovery Statistics
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NOTE: This page is an archived copy of the NEO Statistics page based
on the older definition for 1-km (H=18) asteroids. The current NEO Statistics page
is here.
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NEAR-EARTH ASTEROID DISCOVERY STATISTICS
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The charts and tables below show the number of near-Earth asteroids (NEAs)
discovered by each of the predominant search programs within each half-year
interval from 1995 through 2003.
There are two sets of charts and tables.
The first set shows statistics for all NEAs while the
second set shows statistics for only large NEAs.
In this context, "large" is defined as NEAs with absolute magnitudes
(H) of 18.0 or brighter.
This roughly corresponds to 1 km diameter and larger NEAs.
All Asteroids
Table 1. NEAs Discovered by Site
Half Year
Intervals |
LINEAR
(704) |
NEAT
(566,608,644) |
Spacewatch
(691,291) |
LONEOS
(699) |
Catalina
(703,E12,G96) |
Other | Cumulative
Total |
|---|
| 1995 (1) | 0 | 0 | 14 | 0 | 0 | 4 | 336 |
| 1995 (2) | 0 | 0 | 12 | 0 | 0 | 2 | 350 |
| 1996 (1) | 1 | 5 | 18 | 0 | 0 | 4 | 378 |
| 1996 (2) | 0 | 5 | 10 | 0 | 0 | 2 | 395 |
| 1997 (1) | 3 | 2 | 10 | 0 | 0 | 4 | 414 |
| 1997 (2) | 14 | 9 | 4 | 0 | 0 | 7 | 448 |
| 1998 (1) | 44 | 9 | 19 | 1 | 1 | 7 | 529 |
| 1998 (2) | 92 | 2 | 16 | 6 | 2 | 6 | 653 |
| 1999 (1) | 74 | 0 | 12 | 6 | 11 | 1 | 757 |
| 1999 (2) | 87 | 0 | 7 | 7 | 19 | 3 | 880 |
| 2000 (1) | 107 | 2 | 14 | 21 | 13 | 4 | 1041 |
| 2000 (2) | 151 | 13 | 12 | 17 | 0 | 8 | 1242 |
| 2001 (1) | 95 | 28 | 7 | 22 | 0 | 2 | 1396 |
| 2001 (2) | 182 | 64 | 15 | 20 | 0 | 4 | 1681 |
| 2002 (1) | 158 | 54 | 16 | 14 | 1 | 6 | 1930 |
| 2002 (2) | 128 | 88 | 6 | 7 | 0 | 5 | 2164 |
| 2003 (1) | 102 | 30 | 23 | 34 | 0 | 8 | 2361 |
| 2003 (2) | 133 | 38 | 33 | 20 | 8 | 8 | 2601 |
| 2004 (1) | 167 | 19 | 41 | 14 | 25 | 6 | 2873 |
| 2004 (2) | 136 | 7 | 29 | 25 | 60 | 5 | 3135 |
| 2005 (1) | 78 | 8 | 28 | 22 | 116 | 10 | 3397 |
| 2005 (2) | 59 | 30 | 54 | 20 | 193 | 10 | 3763 |
| 2006 (1) | 44 | 4 | 46 | 13 | 198 | 3 | 4071 |
| 2006 (2)* | 35 | 16 | 47 | 6 | 166 | 4 | 4345 |
* Incomplete half-year (based on discovery data through 2006-Nov-27 06:00 local)
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Large Asteroids
Table 2. Large NEAs Discovered by Site
Half Year
Intervals |
LINEAR
(704) |
NEAT
(566,608,644) |
Spacewatch
(691,291) |
LONEOS
(699) |
Catalina
(703,E12,G96) |
Other | Cumulative
Total |
|---|
| 1995 (1) | 0 | 0 | 3 | 0 | 0 | 2 | 191 |
| 1995 (2) | 0 | 0 | 4 | 0 | 0 | 1 | 196 |
| 1996 (1) | 0 | 2 | 2 | 0 | 0 | 0 | 200 |
| 1996 (2) | 0 | 2 | 0 | 0 | 0 | 0 | 202 |
| 1997 (1) | 0 | 1 | 3 | 0 | 0 | 1 | 207 |
| 1997 (2) | 3 | 4 | 1 | 0 | 0 | 2 | 217 |
| 1998 (1) | 9 | 4 | 2 | 1 | 0 | 2 | 235 |
| 1998 (2) | 27 | 2 | 1 | 3 | 0 | 3 | 271 |
| 1999 (1) | 21 | 0 | 2 | 4 | 4 | 0 | 302 |
| 1999 (2) | 27 | 0 | 1 | 2 | 3 | 2 | 337 |
| 2000 (1) | 35 | 2 | 2 | 3 | 5 | 1 | 385 |
| 2000 (2) | 43 | 2 | 3 | 5 | 0 | 4 | 442 |
| 2001 (1) | 28 | 10 | 0 | 5 | 0 | 0 | 485 |
| 2001 (2) | 31 | 10 | 0 | 5 | 0 | 1 | 532 |
| 2002 (1) | 42 | 5 | 2 | 3 | 0 | 3 | 587 |
| 2002 (2) | 26 | 15 | 0 | 1 | 0 | 2 | 631 |
| 2003 (1) | 19 | 4 | 2 | 6 | 0 | 1 | 663 |
| 2003 (2) | 21 | 6 | 1 | 4 | 2 | 1 | 698 |
| 2004 (1) | 18 | 5 | 1 | 2 | 4 | 1 | 729 |
| 2004 (2) | 10 | 1 | 0 | 1 | 14 | 0 | 755 |
| 2005 (1) | 13 | 1 | 2 | 1 | 11 | 1 | 784 |
| 2005 (2) | 7 | 8 | 5 | 2 | 11 | 1 | 818 |
| 2006 (1) | 3 | 0 | 2 | 1 | 9 | 1 | 834 |
| 2006 (2)* | 3 | 0 | 3 | 0 | 14 | 0 | 854 |
* Incomplete half-year (based on discovery data through 2006-Nov-27 06:00 local)
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Data compiled by Alan Chamberlin.
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NUMBER OF NEOS
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NASA's search program designed to discover 90% of the NEO population
(1 km in diameter or larger) within 10 years is under way.
The chart below shows the cumulative total known near-Earth asteroids versus time.
The blue area shows all near-Earth asteroids while the red area shows only
large near-Earth asteroids.
In this context, "large" is defined as an asteroid having an absolute magnitude
(H) of 18.0 or brighter which roughly corresponds to diameters of
1 km or larger.
The table below shows the total number of NEOs known at selected dates.
The most recent date at the top of the table is generally not
the date the table was updated,
but rather the discovery date of the most recently discovered NEO.
This table is updated daily using discovery data published by the
Minor Planet Center.
------------------------------------------------------------------
Date NEC Aten Apollo Amor PHA+18 PHA NEA+18 NEA NEO
---------- ---- ---- ------ ---- ------ ---- ------ ---- ----
2006-11-28 63 354 2295 1698 163 824 855 4354 4417
2006-11-01 63 344 2247 1674 161 812 845 4271 4334
2006-10-01 61 337 2217 1642 161 802 843 4202 4263
2006-09-01 61 330 2182 1614 160 793 836 4132 4193
2006-08-01 61 328 2165 1601 160 788 836 4100 4161
2006-07-01 61 327 2154 1584 160 786 834 4071 4132
2006-06-01 61 326 2143 1571 160 783 834 4046 4107
2006-05-01 61 325 2114 1544 160 774 830 3988 4049
2006-04-01 60 321 2087 1529 160 764 828 3942 4002
2006-03-01 60 319 2071 1509 160 763 827 3904 3964
2006-02-01 60 316 2036 1492 160 755 824 3849 3909
2006-01-01 60 312 1979 1467 159 745 818 3763 3823
2005-12-01 60 302 1947 1446 158 733 814 3700 3760
2005-11-01 60 297 1905 1420 156 723 808 3627 3687
2005-10-01 59 289 1849 1380 154 710 794 3522 3581
2005-09-01 59 286 1815 1361 154 705 791 3466 3525
2005-08-01 59 283 1801 1344 154 699 788 3432 3491
2005-07-01 59 279 1782 1332 153 692 784 3397 3456
2005-06-01 59 275 1767 1312 153 688 779 3358 3417
2005-05-01 58 274 1751 1296 151 682 775 3325 3383
2005-04-01 58 268 1725 1278 150 670 770 3275 3333
2005-03-01 58 263 1685 1253 149 660 765 3205 3263
2005-02-01 58 262 1661 1246 148 655 761 3173 3231
2005-01-01 58 258 1637 1236 147 648 755 3135 3193
2004-12-01 57 249 1605 1216 147 640 746 3073 3130
2004-11-01 57 245 1585 1210 145 631 740 3043 3100
2004-10-01 56 238 1557 1202 143 620 737 3000 3056
2004-09-01 55 230 1519 1178 143 612 736 2930 2985
2004-08-01 55 226 1499 1156 142 605 732 2884 2939
2004-07-01 55 226 1493 1151 140 602 729 2873 2928
2004-06-01 55 223 1463 1138 139 591 725 2827 2882
2004-05-01 55 218 1444 1123 139 586 719 2787 2842
2004-04-01 55 215 1414 1111 135 575 712 2742 2797
2004-03-01 55 206 1378 1093 135 568 703 2679 2734
2004-02-01 54 204 1363 1086 134 563 702 2655 2709
2004-01-01 54 202 1329 1068 132 553 698 2601 2655
2003-12-01 54 196 1297 1056 129 539 690 2551 2605
2003-11-01 54 193 1275 1043 129 531 682 2513 2567
2003-10-01 54 188 1248 1021 129 522 679 2459 2513
2003-09-01 54 185 1228 988 127 513 671 2403 2457
2003-08-01 54 185 1216 975 123 508 666 2378 2432
2003-07-01 53 184 1209 966 123 506 663 2361 2414
2003-06-01 53 182 1193 955 123 501 657 2332 2385
2003-05-01 51 180 1179 949 122 499 654 2310 2361
2003-04-01 51 175 1159 937 122 492 648 2273 2324
2003-03-01 51 170 1140 926 122 485 644 2238 2289
2003-02-01 51 169 1120 920 122 479 638 2210 2261
2003-01-01 51 167 1093 903 121 469 631 2164 2215
2002-12-01 51 163 1066 883 121 467 627 2113 2164
2002-11-01 51 160 1051 866 120 461 622 2078 2129
2002-10-01 50 158 1027 842 118 454 611 2028 2078
2002-09-01 50 155 1007 823 116 448 599 1986 2036
2002-08-01 50 154 991 801 114 438 593 1947 1997
2002-07-01 49 152 982 795 113 432 587 1930 1979
2002-06-01 49 148 964 787 111 424 581 1900 1949
2002-05-01 49 144 946 776 110 415 569 1867 1916
2002-04-01 49 142 928 764 109 408 565 1835 1884
2002-03-01 48 136 901 751 106 398 559 1789 1837
2002-02-01 48 131 878 735 105 389 548 1745 1793
2002-01-01 48 124 844 712 105 376 532 1681 1729
2001-12-01 48 121 807 694 100 362 523 1623 1671
2001-11-01 46 120 779 679 98 354 515 1579 1625
2001-10-01 46 114 753 656 97 344 510 1524 1570
2001-09-01 46 110 724 623 94 332 494 1458 1504
2001-08-01 45 109 702 603 93 326 489 1415 1460
2001-07-01 44 108 697 590 93 325 485 1396 1440
2001-06-01 43 108 687 579 91 322 476 1375 1418
2001-05-01 42 107 675 568 89 315 468 1351 1393
2001-04-01 42 105 663 559 87 306 463 1328 1370
2001-03-01 42 101 648 545 85 297 454 1295 1337
2001-02-01 42 98 637 534 84 294 447 1270 1312
2001-01-01 42 94 622 525 83 291 442 1242 1284
2000-12-01 42 93 608 512 82 285 431 1214 1256
2000-11-01 42 90 583 496 81 282 422 1170 1212
2000-10-01 42 87 573 482 81 278 414 1143 1185
2000-09-01 42 81 555 456 80 272 405 1093 1135
2000-08-01 42 79 537 440 78 263 396 1057 1099
2000-07-01 42 77 532 431 76 260 385 1041 1083
2000-06-01 42 76 527 425 75 256 382 1029 1071
2000-05-01 42 76 514 411 75 251 375 1002 1044
2000-04-01 41 73 499 398 74 245 365 971 1012
2000-03-01 41 64 483 388 71 233 353 936 977
2000-02-01 41 62 466 377 70 222 344 906 947
2000-01-01 41 57 453 369 70 215 337 880 921
1999-12-01 41 56 443 360 68 207 328 860 901
1999-11-01 41 54 430 346 68 203 318 831 872
1999-10-01 41 54 414 332 67 198 312 801 842
1999-09-01 40 54 397 317 66 192 308 769 809
1999-08-01 40 54 397 315 66 192 307 767 807
1999-07-01 40 54 392 310 65 190 302 757 797
1999-06-01 40 51 385 300 64 185 299 737 777
1999-05-01 40 49 373 295 60 177 290 718 758
1999-04-01 40 48 360 288 59 173 281 697 737
1999-03-01 40 47 350 283 59 172 279 681 721
1999-02-01 40 47 340 278 58 169 275 666 706
1999-01-01 40 45 335 272 57 166 271 653 693
1998-12-01 40 41 325 263 57 162 262 630 670
1998-11-01 40 38 308 255 54 154 256 602 642
1998-10-01 40 36 303 249 54 152 252 589 629
1998-09-01 40 29 290 236 53 140 244 556 596
1998-08-01 40 29 280 225 51 133 238 535 575
1998-07-01 40 29 277 222 49 129 235 529 569
1998-06-01 40 29 271 215 48 127 231 516 556
1998-05-01 40 29 262 209 48 124 227 501 541
1998-04-01 40 27 254 200 48 117 225 482 522
1998-03-01 40 27 242 192 48 112 221 462 502
1998-02-01 40 26 238 192 47 110 220 456 496
1998-01-01 40 26 233 189 47 108 217 448 488
1997-01-01 40 22 204 169 44 97 202 395 435
1996-01-01 40 20 177 153 42 86 196 350 390
1995-01-01 40 19 163 136 41 83 186 318 358
1994-01-01 38 15 140 117 36 70 167 272 310
1993-01-01 38 13 117 101 34 64 152 231 269
1992-01-01 38 11 103 85 31 61 129 199 237
1991-01-01 36 9 76 74 26 49 110 159 195
1990-01-01 36 8 63 63 22 42 93 134 170
1980-01-01 33 3 27 23 13 17 46 53 86
1970-01-01 31 0 13 14 8 10 24 27 58
1960-01-01 30 0 10 10 7 8 18 20 50
1950-01-01 30 0 7 6 4 5 12 13 43
1940-01-01 26 0 3 6 2 3 8 9 35
1930-01-01 25 0 0 5 0 0 5 5 30
1920-01-01 23 0 0 3 0 0 3 3 26
1910-01-01 22 0 0 1 0 0 1 1 23
1900-01-01 20 0 0 1 0 0 1 1 21
Note: "NEC" are Near-Earth comets. "PHA+18" and "NEA+18" are PHAs and NEAs with H <= 18.0. In rough terms,
a Near-Earth asteroid with an absolute magnitude (H) of 18.0 or brighter will have
a diameter of one kilometer or larger.
Data compiled by Alan Chamberlin.
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