Cora»OccDetail

Stellar Occultation by (18016) Grondahl on 2025-09-18 (20:27:49 UT)

Event Details
Occultation UUID [and db] : 7797e690-ddb8-11f0-547e-2b3dbdfe6807 [observed] Occultation Date + Time : 2025-09-18 at 20:27:49 UT +/- 0.0 min [1] Object Designation : (18016) Grondahl Star Designation : GDR3 4103249855907814272 Star Coordinates (ICRF) : RA = 18 35 30.2170, DE = -15 09 16.246 [2] Star Magnitudes : G = 13.62 mag, RP = 12.88 mag, BP = 14.21 mag Object Magnitude : V = 18.46 mag Estimated Magnitude Drop : 4.9 mag Estimated Max. Duration : 0.4 sec Speed of the shadow : 12.7 km/s Object Mean Diameter : 4.9 km (src: astorb) => apparent = 4 mas Apparent Motion : 0.5767 arcs/min @ PA = 96 deg Horizontal Parallax : 4.8390 arcs Dynamical Class : MBA Elongation to Moon & Sun : 136° (sunlit = 9%), Sun = 102° Cross-track uncertainty : 0.3 mas = 0 km = 0.08 path-width (1-sig) RUWE and duplicate source : 0.99 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#55 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and db] : 7797e690-ddb8-11f0-547e-2b3dbdfe6807 [observed]

 Occultation Date + Time   : 2025-09-18 at 20:27:49 UT +/- 0.0 min  [1]
 Object Designation        : (18016) Grondahl
 Star Designation          : GDR3 4103249855907814272
 Star Coordinates (ICRF)   : RA = 18 35 30.2170, DE = -15 09 16.246  [2]
 Star Magnitudes           : G = 13.62 mag, RP = 12.88 mag, BP = 14.21 mag
 Object Magnitude          : V = 18.46 mag
 Estimated Magnitude Drop  : 4.9 mag
 Estimated Max. Duration   : 0.4 sec
 Speed of the shadow       : 12.7 km/s
 Object Mean Diameter      : 4.9 km  (src: astorb) => apparent = 4 mas
 Apparent Motion           : 0.5767 arcs/min @ PA = 96 deg
 Horizontal Parallax       : 4.8390 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 136° (sunlit = 9%), Sun = 102°
 Cross-track uncertainty   : 0.3 mas = 0 km = 0.08 path-width (1-sig)
 RUWE and duplicate source : 0.99 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#55
 Note                      : FP:true

 
 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

More Data and Informations

SiMDA \| 3D Asteroid Catalogue \| Johnston Archive \| Star at CDS (Vizier) \| JPL Small-Body Node \| Minor Planet Center \| Wikipedia

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Occultation Ground Track
Time[UT] \| Lat----CENTR----Lon \| Alt hh:mm:ss \| +DD.dddd +DDD.dddd \| deg ---------------------------------------------- 20:23:42 +59.3187 -075.9601 +05 131 +20 20:23:50 +57.4329 -070.1894 +08 136 +18 20:23:57 +56.1609 -066.2871 +11 140 +17 20:24:05 +55.1490 -063.1505 +13 142 +16 20:24:12 +54.2923 -060.4567 +14 145 +14 20:24:20 +53.5422 -058.0582 +16 147 +13 20:24:27 +52.8714 -055.8734 +17 149 +12 20:24:35 +52.2630 -053.8514 +18 151 +11 20:24:42 +51.7053 -051.9580 +19 153 +10 20:24:50 +51.1902 -050.1691 +20 154 +09 20:24:57 +50.7115 -048.4667 +21 156 +08 20:25:05 +50.2646 -046.8373 +22 158 +07 20:25:12 +49.8457 -045.2700 +23 159 +06 20:25:20 +49.4519 -043.7563 +23 161 +05 20:25:27 +49.0809 -042.2892 +24 162 +04 20:25:35 +48.7305 -040.8629 +25 164 +03 20:25:42 +48.3993 -039.4723 +25 165 +02 20:25:50 +48.0856 -038.1134 +26 167 +01 20:25:57 +47.7885 -036.7825 +26 168 +00 20:26:05 +47.5067 -035.4765 +27 169 -01 20:26:12 +47.2395 -034.1926 +27 171 -02 20:26:20 +46.9861 -032.9282 +28 172 -02 20:26:27 +46.7458 -031.6812 +28 174 -03 20:26:35 +46.5180 -030.4496 +28 175 -04 20:26:42 +46.3023 -029.2315 +28 176 -05 20:26:50 +46.0981 -028.0253 +29 178 -06 20:26:57 +45.9051 -026.8294 +29 179 -07 20:27:05 +45.7231 -025.6424 +29 180 -08 20:27:12 +45.5516 -024.4628 +29 182 -09 20:27:20 +45.3904 -023.2893 +29 183 -09 20:27:27 +45.2395 -022.1208 +30 184 -10 20:27:35 +45.0985 -020.9560 +30 186 -11 20:27:42 +44.9673 -019.7938 +30 187 -12 20:27:50 +44.8459 -018.6329 +30 188 -13 20:27:57 +44.7342 -017.4723 +30 190 -14 20:28:05 +44.6321 -016.3109 +30 191 -15 20:28:12 +44.5397 -015.1474 +29 192 -15 20:28:20 +44.4569 -013.9807 +29 194 -16 20:28:27 +44.3839 -012.8097 +29 195 -17 20:28:35 +44.3207 -011.6332 +29 196 -18 20:28:42 +44.2674 -010.4498 +29 198 -19 20:28:50 +44.2243 -009.2582 +29 199 -20 20:28:57 +44.1914 -008.0570 +28 200 -20 20:29:05 +44.1691 -006.8447 +28 201 -21 20:29:12 +44.1577 -005.6198 +28 203 -22 20:29:20 +44.1574 -004.3803 +27 204 -23 20:29:27 +44.1688 -003.1245 +27 205 -24 20:29:35 +44.1923 -001.8502 +27 207 -24 20:29:42 +44.2285 -000.5550 +26 208 -25 20:29:50 +44.2780 +000.7636 +26 209 -26 20:29:57 +44.3417 +002.1088 +25 211 -27 20:30:05 +44.4204 +003.4840 +24 212 -28 20:30:12 +44.5154 +004.8931 +24 214 -28 20:30:20 +44.6278 +006.3409 +23 215 -29 20:30:27 +44.7593 +007.8329 +22 216 -30 20:30:35 +44.9119 +009.3760 +22 218 -31 20:30:42 +45.0880 +010.9783 +21 219 -32 20:30:50 +45.2906 +012.6504 +20 221 -32 20:30:57 +45.5237 +014.4056 +19 222 -33 20:31:05 +45.7926 +016.2617 +18 224 -34 20:31:12 +46.1046 +018.2429 +16 226 -34 20:31:20 +46.4699 +020.3843 +15 227 -35 20:31:27 +46.9044 +022.7397 +14 229 -36 20:31:35 +47.4350 +025.3994 +12 231 -36 20:31:42 +48.1129 +028.5388 +10 234 -37 20:31:50 +49.0688 +032.6053 +07 237 -37 20:31:57 +51.2346 +040.8187 +01 243 -37 Longitude measured positiv to the East.

Occultation Ground Track

 Time[UT] | Lat----CENTR----Lon | Alt hh:mm:ss | +DD.dddd  +DDD.dddd | deg ---------------------------------------------- 20:23:42   +59.3187  -075.9601   +05  131  +20 20:23:50   +57.4329  -070.1894   +08  136  +18 20:23:57   +56.1609  -066.2871   +11  140  +17 20:24:05   +55.1490  -063.1505   +13  142  +16 20:24:12   +54.2923  -060.4567   +14  145  +14 20:24:20   +53.5422  -058.0582   +16  147  +13 20:24:27   +52.8714  -055.8734   +17  149  +12 20:24:35   +52.2630  -053.8514   +18  151  +11 20:24:42   +51.7053  -051.9580   +19  153  +10 20:24:50   +51.1902  -050.1691   +20  154  +09 20:24:57   +50.7115  -048.4667   +21  156  +08 20:25:05   +50.2646  -046.8373   +22  158  +07 20:25:12   +49.8457  -045.2700   +23  159  +06 20:25:20   +49.4519  -043.7563   +23  161  +05 20:25:27   +49.0809  -042.2892   +24  162  +04 20:25:35   +48.7305  -040.8629   +25  164  +03 20:25:42   +48.3993  -039.4723   +25  165  +02 20:25:50   +48.0856  -038.1134   +26  167  +01 20:25:57   +47.7885  -036.7825   +26  168  +00 20:26:05   +47.5067  -035.4765   +27  169  -01 20:26:12   +47.2395  -034.1926   +27  171  -02 20:26:20   +46.9861  -032.9282   +28  172  -02 20:26:27   +46.7458  -031.6812   +28  174  -03 20:26:35   +46.5180  -030.4496   +28  175  -04 20:26:42   +46.3023  -029.2315   +28  176  -05 20:26:50   +46.0981  -028.0253   +29  178  -06 20:26:57   +45.9051  -026.8294   +29  179  -07 20:27:05   +45.7231  -025.6424   +29  180  -08 20:27:12   +45.5516  -024.4628   +29  182  -09 20:27:20   +45.3904  -023.2893   +29  183  -09 20:27:27   +45.2395  -022.1208   +30  184  -10 20:27:35   +45.0985  -020.9560   +30  186  -11 20:27:42   +44.9673  -019.7938   +30  187  -12 20:27:50   +44.8459  -018.6329   +30  188  -13 20:27:57   +44.7342  -017.4723   +30  190  -14 20:28:05   +44.6321  -016.3109   +30  191  -15 20:28:12   +44.5397  -015.1474   +29  192  -15 20:28:20   +44.4569  -013.9807   +29  194  -16 20:28:27   +44.3839  -012.8097   +29  195  -17 20:28:35   +44.3207  -011.6332   +29  196  -18 20:28:42   +44.2674  -010.4498   +29  198  -19 20:28:50   +44.2243  -009.2582   +29  199  -20 20:28:57   +44.1914  -008.0570   +28  200  -20 20:29:05   +44.1691  -006.8447   +28  201  -21 20:29:12   +44.1577  -005.6198   +28  203  -22 20:29:20   +44.1574  -004.3803   +27  204  -23 20:29:27   +44.1688  -003.1245   +27  205  -24 20:29:35   +44.1923  -001.8502   +27  207  -24 20:29:42   +44.2285  -000.5550   +26  208  -25 20:29:50   +44.2780  +000.7636   +26  209  -26 20:29:57   +44.3417  +002.1088   +25  211  -27 20:30:05   +44.4204  +003.4840   +24  212  -28 20:30:12   +44.5154  +004.8931   +24  214  -28 20:30:20   +44.6278  +006.3409   +23  215  -29 20:30:27   +44.7593  +007.8329   +22  216  -30 20:30:35   +44.9119  +009.3760   +22  218  -31 20:30:42   +45.0880  +010.9783   +21  219  -32 20:30:50   +45.2906  +012.6504   +20  221  -32 20:30:57   +45.5237  +014.4056   +19  222  -33 20:31:05   +45.7926  +016.2617   +18  224  -34 20:31:12   +46.1046  +018.2429   +16  226  -34 20:31:20   +46.4699  +020.3843   +15  227  -35 20:31:27   +46.9044  +022.7397   +14  229  -36 20:31:35   +47.4350  +025.3994   +12  231  -36 20:31:42   +48.1129  +028.5388   +10  234  -37 20:31:50   +49.0688  +032.6053   +07  237  -37 20:31:57   +51.2346  +040.8187   +01  243  -37

Longitude measured positiv to the East.

------------------------------------------------------------------------------------------- Azm Sun | Lat----EDGE1----Lon | Lat----EDGE2----Lon deg deg | +DD.dddd +DDD.dddd | +DD.dddd +DDD.dddd --------------------------------------------- +59.4732 -076.2753 +59.1697 -075.6616 +57.5344 -070.3431 +57.3326 -070.0391 +56.2457 -066.3923 +56.0766 -066.1834 +55.2249 -063.2305 +55.0735 -063.0713 +54.3624 -060.5208 +54.2225 -060.3932 +53.6081 -058.1112 +53.4765 -058.0058 +52.9341 -055.9180 +52.8089 -055.8292 +52.3231 -053.8894 +52.2030 -053.8137 +51.7634 -051.9908 +51.6474 -051.9255 +51.2465 -050.1974 +51.1340 -050.1409 +50.7664 -048.4914 +50.6567 -048.4422 +50.3182 -046.8587 +50.2111 -046.8160 +49.8982 -045.2886 +49.7933 -045.2515 +49.5034 -043.7725 +49.4005 -043.7402 +49.1315 -042.3032 +49.0303 -042.2753 +48.7804 -040.8748 +48.6808 -040.8510 +48.4484 -039.4825 +48.3502 -039.4622 +48.1342 -038.1219 +48.0372 -038.1050 +47.8364 -036.7895 +47.7406 -036.7756 +47.5542 -035.4821 +47.4594 -035.4710 +47.2865 -034.1968 +47.1926 -034.1884 +47.0327 -032.9312 +46.9396 -032.9252 +46.7920 -031.6830 +46.6997 -031.6794 +46.5638 -030.4503 +46.4722 -030.4490 +46.3478 -029.2311 +46.2568 -029.2320 +46.1433 -028.0239 +46.0529 -028.0268 +45.9501 -026.8270 +45.8602 -026.8319 +45.7678 -025.6389 +45.6784 -025.6458 +45.5961 -024.4584 +45.5071 -024.4671 +45.4348 -023.2840 +45.3461 -023.2946 +45.2837 -022.1146 +45.1953 -022.1270 +45.1425 -020.9489 +45.0545 -020.9631 +45.0113 -019.7858 +44.9234 -019.8018 +44.8898 -018.6241 +44.8021 -018.6418 +44.7780 -017.4626 +44.6905 -017.4821 +44.6759 -016.3002 +44.5885 -016.3215 +44.5834 -015.1358 +44.4961 -015.1589 +44.5006 -013.9683 +44.4133 -013.9932 +44.4276 -012.7964 +44.3403 -012.8231 +44.3644 -011.6188 +44.2770 -011.6475 +44.3112 -010.4344 +44.2237 -010.4650 +44.2681 -009.2418 +44.1805 -009.2744 +44.2354 -008.0396 +44.1475 -008.0743 +44.2132 -006.8263 +44.1251 -006.8631 +44.2019 -005.6002 +44.1135 -005.6393 +44.2018 -004.3595 +44.1131 -004.4010 +44.2134 -003.1025 +44.1243 -003.1465 +44.2372 -001.8268 +44.1475 -001.8735 +44.2737 -000.5302 +44.1834 -000.5798 +44.3235 +000.7900 +44.2326 +000.7374 +44.3876 +002.1368 +44.2959 +002.0809 +44.4667 +003.5138 +44.3742 +003.4543 +44.5622 +004.9249 +44.4687 +004.8614 +44.6751 +006.3749 +44.5805 +006.3070 +44.8073 +007.8694 +44.7114 +007.7966 +44.9607 +009.4153 +44.8632 +009.3369 +45.1376 +011.0208 +45.0384 +010.9361 +45.3413 +012.6966 +45.2399 +012.6045 +45.5758 +014.4562 +45.4718 +014.3553 +45.8462 +016.3175 +45.7392 +016.2061 +46.1601 +018.3053 +46.0492 +018.1808 +46.5280 +020.4553 +46.4120 +020.3139 +46.9660 +022.8223 +46.8431 +022.6579 +47.5017 +025.4990 +47.3686 +025.3010 +48.1881 +028.6671 +48.0382 +028.4125 +49.1632 +032.7983 +48.9760 +032.4174 +49.0347 +033.4348 +50.9387 +039.9290 Azimuth (Azm) measured from North to East.

Apply ephem. offset (O-C) in RA & DE and CTU:
CTU: Cross-track uncertainty (zero means: use the nominal prediction value, see event details below). Offsets and CTU all in mas.