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Дата изменения: Wed Dec 5 17:39:11 2007
Дата индексирования: Mon Oct 1 19:48:54 2012
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This Table contains results of our analysis of an "interior" accuracy of CCD positional Numbered Minor Planets observations carried out in indication month of current year. The observatories taken into consideration are given with their MPC codes and instrumental equipment. A number of considered Numbered Minor Planets and their processed positions is given together with a mean error of a single observation for RA and DEC. Only one night observations were used for getting these errors.

A visitor may click required MPC code number (blue color) and see the first 100 Kb information as to detailed test of CCD positions made with this MPC code and sent to the MPC Database. These information tables show the (O-C) values for each observation.

If you find any inaccurate recording, please, send us a letter for correction.

Internal errors September, 2007
--------------------------------------------------------------------------------- MPC Country, Diam., Scale, Number Number Mean errors of code Observa- Focus FOV Cata- of minor of single observation tory (m) log planets positions RA DE --------------------------------------------------------------------------------- " " 012 Belgium, 0.85 45 x 30' 0.9" 17 121 0.427 0.375 Uccle 2.1 GSC 106 Slovenia, 0.36 36 x 36' 2.0" 293 1260 0.320 0.379 Crni vrh 2.4 USNO 113 Germany, 0.50 13 x 10' 2" 4 22 0.229 0.190 Schonbrunn 2.3 USNO 118 Slovakia, 0.57 14 x 10' 1.7" 9 46 0.073 0.065 Modra 3.3 USNO 127 Germany, 0.19 30 x 20' 2.4" 2 8 0.132 0.103 Bornheim 0.8 GSC 130 Italy, 0.4 15 x 10' 1.0" 29 113 0.323 0.360 Lumezzane 1.8 USNO 138 France, 0.20 36 x 24' 2.8" 2 6 0.271 0.223 Village-Neuf 0.8 GSC 151 Switzerland, 0.25 24 x 16' 0.9" 14 100 0.321 0.296 Eschenberg 2.0 USNO 160 Italy, Castel- 0.25 14 x 9' 2.2" 1 4 0.278 0.133 martini 1.7 GSC 170 Spain, Obs. 0.31 No data 3 10 0.315 0.383 de Begues 2.0 GSC 185 Switzerland, 0.61 23 x 15' 0.9" 57 268 0.370 0.291 jur.-Vicques 2.1 USNO 196 Germany, 0.20 No data 2 6 0.239 0.113 Homburg-Erbach 1.3 USNO 198 Germany, 0.24 12 x 9' 2.0 8 47 0.061 0.090 Wildberg 2.4 USNO 204 Italy, Schia- 0.60 12 x 12' 1.4" 2 6 0.144 0.058 parelli Obs. 2.8 USNO 213 Spain, Observ. 0.30 No data 2.4" 4 12 0.200 0.195 Montcabre 1.7 232 Spain, Masqu- 0.25 13 x 9' 2.0" 11 33 0.487 0.468 efa Observ. 1.8 GSC 235 CAST Obs., Tal- 0.35 No data 1 3 0.484 0.293 massons, Italy 1.8 USNO 240 Germany, Her- 0.40 15 x 10' 2.4" 7 45 0.218 0.183 renberg Sternw. 1.6 USNO 291 USA,Kitt Peak, 1.8 390 x 30' 1.0" 388 1326 0.200 0.174 Spacewatch II 4.7 USNO 300 Japan, 0.5 78 x 78' 2.3" 9 57 0.219 0.222 Bisei Center 1.3 ACT 355 Japan, 0.28 21 x 16' 3.7" 2 7 0.331 0.338 Hadano 1.4 GSC 379 Japan, Hama 0.25 17 x 13' 2.1" 1 14 0.312 0.294 -matsu-Yuto 1.25 ACT 413 Australia, var. No data 107 707 0.165 0.137 Siding Spring UCAC 423 Australia, 0.2 30 x 20' 2.3" 1 3 0.090 0.025 North Ryde 0.8 UCAC 434 Italy, 0.18 10 x 7' 1.3" 1 4 0.335 0.340 S.Benedetto Po 1.6 GSC 448 USA, Desert 0.30 21 x 21' 2.4" 19 57 0.453 0.307 Moon Observat. 2.0 USNO 473 Italy, 0.30 No data 5 15 0.236 0.226 Remanzacco 0.8 GSC 510 Siegen, 0.30 No data 2 9 0.167 0.126 Germany 1.5 USNO 557 Czech Rep., 0.65 20 x 13' 1.6" 5 91 0.075 0.063 Ondrejov 2.3 USNO 560 Italy, Madon- 0.40 17 x 10' 2.6" 2 6 0.075 0.171 na di Dossob. 2.0 GSC 568 USA, 2.24 18 x 18' 0.4" 10 39 0.053 0.058 Mauna Kea 22.0 USNO 585 Kiev comet sta- 0.70 No data 3 11 0.855 1.179 tion, Ukraine 2.8 USNO 586 France, 1.05 No data 72 253 0.649 0.362 Pic du Midi 6.3 USNO 595 Italy, Farra 0.40 16 x 12' 2.8" 5 15 0.210 0.522 d'Isonzo 1.8 GSC 621 Germany, Ber- 0.60 11 x 10' 1.2" 42 182 0.203 0.157 gisch Gladbach 3.1 USNO 639 Germany, 0.35 14 x 11' 2.3" 1 10 0.214 0.142 Dresden 1.5 GSC 651 USA, Grass- 0.62 No data 1 3 0.040 0.044 lands Obs. 3.2 GSC 670 USA, 0.30 18 x 13' 3" 1 3 0.344 0.263 Camarillo 1.6 USNO 673 USA, Table 0.61 22 x 22' 0.3" 7 22 0.177 0.104 Mountain 9.0 ACT 683 USA, Good- 0.36 20 x 20' 2.5" 790 6117 0.615 0.690 ricke-Pigott 4.0 GSC 691 USA, 0.88 390 x 30' 1.1" 3910 18511 0.273 0.278 Spacewatch 4.6 USNO 699 USA, Lowell, 0.59 173 x 173' 2.5" 12002 73166 0.503 0.466 LONEOS 1.1 USNO 701 USA, Junk Bond 0.4 24 x 16' 1.8" 72 305 0.471 0.310 Obs., 2.5 ACT 703 USA, Catalina 0.41 175 x 175' 2.6" 16817 91456 0.524 0.436 Sky Survey 1.2 USNO 704 USA, 1.0 94 x 72' 2.2" 21969 222972 0.510 0.493 Lincoln Lab. 2.2 USNO 711 USA, 0.76 46 x 46' 1.3" 5 15 1.003 0.175 McDonald Obs. 2.3 GSC 718 USA, 0.35 No data 1 4 0.321 0.175 Wiggins Obs. 1.4 734 USA, 0.30 13 x 9' 2.1" 1 3 0.372 0.121 Farpoint Obs. 1.8 GSC 735 USA, 0.46 No data 10 47 0.364 0.528 George Obs. USNO 807 USA, Cerro 4.0 37 x 37' 0.3" 6 18 0.072 0.133 Tololo 14.4 USNO 808 Argentina, 0.5 60 x 60' 0.8" 17 77 0.964 0.665 Carl.U.Cesco 3.8 USNO 932 USA, John J. 0.40 No data 2 6 0.121 0.031 McCarthy Obs. 2.7 USNO 941 Spain, Obs. 0.26 21 x 21' 2.4" 5 18 0.166 0.184 Pla D'Arguin. 1.7 GSC 945 Spain, 0.36 11 x 7' 1.6" 3 14 0.492 0.154 Monte Deva 2.3 USNO 947 France, Sa- 0.60 25 x 25' 1" 4 12 0.252 0.317 int-Sulpice 3.4 USNO 951 England, 0.25 15 x 15' 2.0" 51 158 0.344 0.305 Highworth 1.6 ACT 987 6 32 0.306 0.304 A06 Mataro, 0.25 No data 1 3 0.167 0.256 Spain 1.6 UCAC A13 Obs. Naef, 0.3 39 x 26' 1.6 26 90 0.217 0.268 Switzerland 1.2 UCAC A17 Guidestar Obs., 0.20 No data 7 21 0.185 0.270 Weinheim, Germ. 1.8 UCAC A24 New Millennium 0.36 12 x 12' 1.4 56 668 0.419 0.345 Obs., Italy 3.9 GSC A37 Mueggelheim, 0.2 11 x 7' 1.8 1 3 0.068 0.060 Germany 2.0 USNO A39 Altenburg, 0.25 15 x 11' 1.2 2 9 0.243 0.077 Germany 1.5 USNO A44 Altschwendt, 0.30 17 x 13' 1.5 6 32 0.153 0.276 Austria 1.8 USNO A48 Verona, 0.30 No data 1 4 0.078 0.042 Italy 1.5 USNO A50 Andrushivka, 0.60 23 x 23' 1.4 85 439 0.435 0.359 Ukraine 4.5 USNO A53 Peschiera del 0.25 12 x 9' 1.0 2 8 0.152 0.274 Garda, Italy 2.5 USNO A65 Le Couvent 0.13 30 x 20' 2.3 7 22 0.107 0.099 de Lentin, Fr. 0.8 USNO A74 Bergen-Enkh. 0.36 17 x 17' 0.8 2 16 0.089 0.073 Obs., Germany 1.8 UCAC A77 Obs. Chante- 0.20 27 x 20' 2.1 413 2160 0.383 0.290 Perdrix,France 1.86 USNO A78 Stia, Italy 0.28 40 x 27' 1.1 4 21 0.560 0.216 2.8 UCAC A87 Rimbach, 0.35 40 x 28' 0.6 11 46 0.848 0.693 Germany 3.0 USNO A88 Bolzaneto, 0.20 21 x 16' 2.2 1 4 0.660 0.444 Italy 2.0 UCAC A94 Cormons, 0.36 18 x 12' 0.5 1 3 0.181 0.021 Italy 2.9 UCAC-2 B00 Savigny-le- 0.31 No data 3 9 0.472 0.977 Temple, France 1.1 USNO B01 Taunus Obs., 0.6 62 x 42' 1.9 28 145 0.408 0.271 Germany 2.0 USNO B03 Alter Satz- 0.35 30 x 20' 1.8 1 4 0.045 0.403 berg, Austria 2.6 USNO B15 Inastars Obs., 0.36 No data 4 17 0.247 0.249 Germany USNO B19 Obs., Mataro 0.15 No data 1 3 0.241 0.363 Spain GSC B20 Obs. Carmeli- 0.13 No data 5 21 0.407 0.247 ta, Spain 0.8 UCAC B21 Gaisberg Obs., No data 7 24 0.172 0.190 Austria B24 Cesson, 0.2 22 x 14' 0.9 2 6 0.156 0.288 France 2.2 UCAC B32 Gelenau, 0.28 No data 1 4 0.172 0.127 Germany 1.3 UCAC B37 Obs. Barcelona, 0.51 No data 1 78 1.025 0.417 Spain 2.0 USNO B38 Santa Mama, 0.30 No data 8 100 0.366 0.358 Italy 3.0 USNO B40 Skylive Obs., 0.41 No data 9 37 0.557 0.426 Catania, Italy 4.1 USNO B42 Vitebsk, 0.3 11 x 8' 0.89 2 6 0.518 0.274 Belarus 1.5 USNO B43 Hennef, 0.30 No data 7 74 0.440 0.315 Germany 1.0 UCAC B46 Sintini Obs., 0.30 12 x 11' 1.4 1 4 0.162 0.121 Italy 3.0 UCAC B48 5 54 0.367 0.593 D21 Shenton Park, 0.25 No data 44 132 0.562 0.401 Australia 2.5 USNO D29 Purple Mount., 1.04 No data 2874 12623 0.346 0.308 China D35 Lulin Observ., 1.0 12 x 11' 0.5 934 3495 0.227 0.197 Taiwan 8.0 USNO E11 Frog Rock 0.32 No data 1 4 0.315 0.184 Obs.,Australia UCAC E12 Siding Spring 0.5 No data 3685 19238 0.378 0.352 Surv.,Australia UCAC E14 Ngunnawal, 0.25 15 x 11' 2 6 29 0.326 0.251 Australia 1.2 USNO E19 Kingsgrove, 0.35 9 x 9' 1.1 3 9 0.521 0.420 Australia 3.7 UCAC F84 Hibiscus Obs., 0.36 No data 38 122 0.441 0.399 Fr. Polynesia 1.0 UCAC F85 3 9 0.100 0.148 G69 Thousand Oaks, 0.30 No data 2 12 0.249 0.321 U.S.A. 3.0 UCAC G92 Jarnac Obser. 0.35 No data 10 30 0.266 0.322 U.S.A. f/2 USNO G96 Mt. Lemmon 1.5 66 x 66' 1.0 11562 54233 0.239 0.170 Survey, U.S.A. f/2 UCAC G98 Calvin-Rehob. 0.41 22 x 14' 0.6 1 4 0.370 0.270 Obs., U.S.A. 3.4 USNO H06 New Mexico Ski- 0.25 56 x 37' 2.2 1 6 0.375 0.230 es Obs., Germ. 0.8 UCAC H07 7300 Observ., 0.45 No data 43 176 0.490 0.582 Canada f/3 GSC-ACT H45 Petit Jean 0.41 No data 10 133 0.217 0.191 Mount., USA 1.4 UCAC H51 Greiner Res. 0.36 No data 91 297 0.544 0.399 Obs., USA UCAC H55 Antares Obs. 0.40 21 x 21' 2.4 41 142 0.407 0.322 U.S.A. f/5.8 USNO H67 Stonegate Obs., 0.35 19 x 19' 2 1 4 0.120 0.088 U.S.A. 2.45 USNO H68 Red Barn Obs., 0.30 24 x 16' 1.8 74 386 0.351 0.434 Ty Ty, USA 1.0 USNO H82 CBA-NOVAC 0.66 No data 5 50 0.228 0.179 Obs., U.S.A. 1.8 UCAC H93 Berkeley 0.25 26 x 21' 1.2 1 3 0.437 0.110 Heights, USA 2.7 USNO H98 Dark Roseanne 0.20 20 x 15' 1 3 0.291 0.100 Obs., USA 0.8 USNO I08 Alianza S4, 0.45 No data 3 35 0.172 0.157 Argentina 1.3 UCAC J40 Malaga, 0.20 17 x 12' 1.5 2 6 0.228 0.131 Spain 1.0 USNO J41 Raheny, 0.25 31 x 23' 1.3 5 21 0.212 0.142 Ireland 1.0 USNO J42 Puzol, 0.20 No data 4 16 0.365 0.328 Spain 1.6 USNO J44 Obs. Iturri- 0.30 No data 2 9 0.523 0.398 eta, Alava 1.0 USNO J47 Obs. Nazaret, 0.20 No data 3 10 0.188 0.352 Spain 1.3 UCAC J51 Obs. Atlante, 0.2 42 x 28' 1.5 7 29 0.231 0.405 Tenerife,Spain 1.8 USNO J59 Obs. Linceo, 0.25 33 x 25' 2.6 1 3 0.167 0.042 Spain 0.8 UCAC J65 Celbridge, 0.2 13 x 10' 1.5 2 6 0.220 0.250 Ireland 1.5 USNO J70 Obs. Astr. El 0.20 No data 2 10 0.336 0.477 Palmar, Spain USNO J75 OAM Obs., La 0.35 No data 612 1848 0.280 0.273 Sagra, Spain f/6 UCAC J76 La Murta, 0.40 14 x 14' 1.6 1 9 0.374 0.266 Spain 2.6 USNO J87 La Canada, 0.30 16 x 16' 1.4 37 114 0.222 0.171 Spain 1.2 USNO J88 Strawberry Fi- 0.30 9 x 7' 1.5 10 33 0.400 0.294 eld Obs., Engl. 3.0 USNO J95 Great Shefford, 0.30 25 x 25' 1.5 20 73 0.384 0.236 England 1.9 USNO

This Table contains results of our analysis of an "exterior" accuracy of CCD positional Numbered Minor Planets observations carried out in indication month of current year. The observatories taken into consideration are given with their MPC codes and instrumental equipment. A number of considered Numbered Minor Planets and their processed positions is given together with a mean error of a single observation for RA and DEC. Several close night observations were used for getting these errors. A visitor may click required MPC code number (blue color) and see the first 100 Kb information as to detailed test of CCD positions made with this MPC code and sent to the MPC Database. These information tables show the (O-C) values for each observation.

If you find any inaccurate recording, please, send us a letter for correction.

External errors September, 2007
--------------------------------------------------------------------------------- MPC Country, Diam., Scale, Number Number Mean errors of code Observa- Focus FOV Cata- of minor of single observation tory (m) log planets positions RA DE --------------------------------------------------------------------------------- " " 012 Belgium, 0.85 45 x 30' 0.9" 6 70 0.471 0.357 Uccle 2.1 GSC 106 Slovenia, 0.36 36 x 36' 2.0" 20 168 0.285 0.349 Crni vrh 2.4 USNO 113 Germany, 0.50 13 x 10' 2" 1 9 0.352 0.114 Schonbrunn 2.3 USNO 118 Slovakia, 0.57 14 x 10' 1.7" 1 19 0.072 0.058 Modra 3.3 USNO 138 France, 0.20 36 x 24' 2.8" 1 5 0.570 1.263 Village-Neuf 0.8 GSC 151 Switzerland, 0.25 24 x 16' 0.9" 4 62 0.347 0.447 Eschenberg 2.0 USNO 185 Switzerland, 0.61 23 x 15' 0.9" 6 42 0.490 0.430 jur.-Vicques 2.1 USNO 196 Germany, 0.20 No data 1 4 0.145 0.141 Homburg-Erbach 1.3 USNO 198 Germany, 0.24 12 x 9' 2.0 2 18 0.202 0.133 Wildberg 2.4 USNO 204 Italy, Schia- 0.60 12 x 12' 1.4" 1 4 0.034 0.026 parelli Obs. 2.8 USNO 240 Germany, Her- 0.40 15 x 10' 2.4" 1 13 0.271 0.122 renberg Sternw. 1.6 USNO 291 USA,Kitt Peak, 1.8 390 x 30' 1.0" 31 207 0.208 0.168 Spacewatch II 4.7 USNO 300 Japan, 0.5 78 x 78' 2.3" 1 17 0.175 0.225 Bisei Center 1.3 ACT 379 Japan, Hama 0.25 17 x 13' 2.1" 1 14 0.314 0.264 -matsu-Yuto 1.25 ACT 413 Australia, var. No data 41 478 0.179 0.183 Siding Spring UCAC 510 Siegen, 0.30 No data 2 9 0.312 0.254 Germany 1.5 USNO 557 Czech Rep., 0.65 20 x 13' 1.6" 3 76 0.084 0.073 Ondrejov 2.3 USNO 568 USA, 2.24 18 x 18' 0.4" 3 18 0.067 0.092 Mauna Kea 22.0 USNO 586 France, 1.05 No data 10 62 1.370 0.966 Pic du Midi 6.3 USNO 595 Italy, Farra 0.40 16 x 12' 2.8" 3 17 0.264 0.504 d'Isonzo 1.8 GSC 621 Germany, Ber- 0.60 11 x 10' 1.2" 13 94 0.223 0.186 gisch Gladbach 3.1 USNO 639 Germany, 0.35 14 x 11' 2.3" 1 10 0.204 0.139 Dresden 1.5 GSC 673 USA, Table 0.61 22 x 22' 0.3" 13 52 0.068 0.038 Mountain 9.0 ACT 675 USA, var. No data 1 4 0.216 0.179 Palomar 683 USA, Good- 0.36 20 x 20' 2.5" 612 6089 0.720 0.865 ricke-Pigott 4.0 GSC 691 USA, 0.88 390 x 30' 1.1" 1713 11903 0.292 0.284 Spacewatch 4.6 USNO 699 USA, Lowell, 0.59 173 x 173' 2.5" 5523 48116 0.500 0.457 LONEOS 1.1 USNO 701 USA, Junk Bond 0.4 24 x 16' 1.8" 7 65 0.490 0.144 Obs., 2.5 ACT 703 USA, Catalina 0.41 175 x 175' 2.6" 5245 43948 0.561 0.467 Sky Survey 1.2 USNO 704 USA, 1.0 94 x 72' 2.2" 14078 190594 0.583 0.553 Lincoln Lab. 2.2 USNO 735 USA, 0.46 No data 2 21 0.283 0.503 George Obs. USNO 808 Argentina, 0.5 60 x 60' 0.8" 7 46 0.752 0.444 Carl.U.Cesco 3.8 USNO 987 3 21 0.335 0.345 A13 Obs. Naef, 0.3 39 x 26' 1.6 11 62 0.164 0.173 Switzerland 1.2 UCAC A24 New Millennium 0.36 12 x 12' 1.4 47 709 0.407 0.332 Obs., Italy 3.9 GSC A44 Altschwendt, 0.30 17 x 13' 1.5 2 19 0.429 0.278 Austria 1.8 USNO A50 Andrushivka, 0.60 23 x 23' 1.4 18 169 0.467 0.351 Ukraine 4.5 USNO A77 Obs. Chante- 0.20 27 x 20' 2.1 164 1392 0.481 0.363 Perdrix,France 1.86 USNO A78 Stia, Italy 0.28 40 x 27' 1.1 1 9 0.389 0.304 2.8 UCAC A87 Rimbach, 0.35 40 x 28' 0.6 1 9 0.937 0.943 Germany 3.0 USNO B01 Taunus Obs., 0.6 62 x 42' 1.9 12 76 0.337 0.264 Germany 2.0 USNO B09 Capannoli, 0.25 24 x 16' 1.9 1 4 0.339 0.070 Italy 1.6 USNO B15 Inastars Obs., 0.36 No data 1 6 0.070 0.058 Germany USNO B19 Obs., Mataro 0.15 No data 1 4 0.308 0.207 Spain GSC B20 Obs. Carmeli- 0.13 No data 1 9 0.631 0.129 ta, Spain 0.8 UCAC B21 Gaisberg Obs., No data 2 10 0.206 0.106 Austria B37 Obs. Barcelona, 0.51 No data 1 78 0.799 0.495 Spain 2.0 USNO B38 Santa Mama, 0.30 No data 4 69 0.312 0.308 Italy 3.0 USNO B47 Metsala Obs., 0.21 26 x 26' 1.5 4 16 0.175 0.102 Finland 1.5 USNO B48 2 39 0.376 0.706 D29 Purple Mount., 1.04 No data 91 824 0.385 0.319 China D35 Lulin Observ., 1.0 12 x 11' 0.5 200 1295 0.276 0.212 Taiwan 8.0 USNO E12 Siding Spring 0.5 No data 1204 9895 0.359 0.339 Surv.,Australia UCAC E14 Ngunnawal, 0.25 15 x 11' 2 3 18 0.256 0.179 Australia 1.2 USNO F84 Hibiscus Obs., 0.36 No data 13 65 0.449 0.462 Fr. Polynesia 1.0 UCAC G69 Thousand Oaks, 0.30 No data 2 12 0.407 0.304 U.S.A. 3.0 UCAC G96 Mt. Lemmon 1.5 66 x 66' 1.0 1533 13355 0.263 0.203 Survey, U.S.A. f/2 UCAC H06 New Mexico Ski- 0.25 56 x 37' 2.2 1 6 0.340 0.463 es Obs., Germ. 0.8 UCAC H45 Petit Jean 0.41 No data 8 124 0.234 0.260 Mount., USA 1.4 UCAC H51 Greiner Res. 0.36 No data 2 19 0.378 0.698 Obs., USA UCAC H55 Antares Obs. 0.40 21 x 21' 2.4 5 30 0.300 0.178 U.S.A. f/5.8 USNO H68 Red Barn Obs., 0.30 24 x 16' 1.8 24 186 0.440 0.481 Ty Ty, USA 1.0 USNO H82 CBA-NOVAC 0.66 No data 4 46 0.258 0.235 Obs., U.S.A. 1.8 UCAC I08 Alianza S4, 0.45 No data 3 35 0.174 0.172 Argentina 1.3 UCAC J40 Malaga, 0.20 17 x 12' 1.5 2 10 0.191 0.246 Spain 1.0 USNO J41 Raheny, 0.25 31 x 23' 1.3 3 21 0.110 0.188 Ireland 1.0 USNO J44 Obs. Iturri- 0.30 No data 1 6 0.262 0.432 eta, Alava 1.0 USNO J51 Obs. Atlante, 0.2 42 x 28' 1.5 2 14 1.834 0.670 Tenerife,Spain 1.8 USNO J65 Celbridge, 0.2 13 x 10' 1.5 2 9 0.184 0.190 Ireland 1.5 USNO J75 OAM Obs., La 0.35 No data 2 12 0.405 0.131 Sagra, Spain f/6 UCAC J88 Strawberry Fi- 0.30 9 x 7' 1.5 3 18 0.426 0.171 eld Obs., Engl. 3.0 USNO J95 Great Shefford, 0.30 25 x 25' 1.5 7 45 0.463 0.312 England 1.9 USNO