Event between (181855) 98WT31 and star GA1340:03326982 with event index number of 1641302
Geocentric closest approach at 2026/12/13 08:41:46 UTC
J2000 position of star is 05:47:56.2 +45:25:44
Equinox of date position of star is 05:49:44.5 +45:26:08
Stellar brightness G=15.7,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 136 degrees from the moon.
Moon is 16% illuminated.
Apparent brightness V=23.5
[RECON map]
Object is 37.7 AU from the Sun
and 36.7 AU from the Earth.
Apparent velocity is 25.3
km/sec on the sky relative to the star, or,
3.4 arcsec/hr.
The 1-sigma error in the time of the event is 492 seconds.
The 1-sigma cross-track error in the shadow position is
5341 km.
The sky-plane scale is
26653.0 km/arcsec.
The object has an absolute magnitude Hv=7.7
Diameter=173.8 km assuming a 5% albedo -- 6.9 sec chord
Diameter=70.9 km assuming a 30% albedo -- 2.8 sec chord
Dynamical classification is SCATEXTD
Star training set for 181855, (2026/12/13 08:42UT) Object RA Dec mag sep mel Pollux 07:46:57.9 +27:57:32 1.1 28.98 164 34Bet Aur 06:01:30.4 +44:56:50 1.9 2.10 138 35Pi Aur 06:01:56.2 +45:56:10 5.9 2.16 137 PPM 048461 05:50:43.0 +45:14:37 8.0 0.24 136 PPM 048442 05:49:05.3 +45:24:30 9.7 0.15 135 181855 05:49:55.6 +45:26:10 15.7 136 Positions are for equinox of date
This table contains the target star visibility for the RECON
network. The observing range has been set to a maximum of
1.8 sigma about the mid-time.
The median site spacing is 36.7 km
RECON observability=1.0 and success probability=11.7%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Sleaford | 08:41:00 | -55.0 | Dark | Down | 75.6 | 250.1 | Up | 08:26:00 - 08:56:00 | -1133 |
| Kamloops | 08:41:36 | -61.1 | Dark | Down | 83.7 | 215.0 | Up | 08:26:36 - 08:56:36 | -1525 |
| Kelowna | 08:41:33 | -61.6 | Dark | Down | 84.0 | 224.6 | Up | 08:26:33 - 08:56:33 | -1603 |
| Peachland | 08:41:34 | -61.8 | Dark | Down | 84.2 | 223.8 | Up | 08:26:34 - 08:56:34 | -1619 |
| Summerland | 08:41:34 | -61.9 | Dark | Down | 84.3 | 225.3 | Up | 08:26:34 - 08:56:34 | -1634 |
| Penticton | 08:41:33 | -61.9 | Dark | Down | 84.3 | 226.4 | Up | 08:26:33 - 08:56:33 | -1640 |
| Oliver | 08:41:33 | -62.2 | Dark | Down | 84.5 | 229.0 | Up | 08:26:33 - 08:56:33 | -1678 |
| Anarchist Mountain Observatory | 08:41:32 | -62.3 | Dark | Down | 84.5 | 231.4 | Up | 08:26:32 - 08:56:32 | -1695 |
| Okanogan | 08:41:32 | -63.0 | Dark | Down | 85.0 | 235.9 | Up | 08:26:32 - 08:56:32 | -1768 |
| Victoria | 08:41:43 | -63.8 | Dark | Down | 86.6 | 205.4 | Up | 08:26:43 - 08:56:43 | -1791 |
| Brewster | 08:41:32 | -63.3 | Dark | Down | 85.3 | 237.6 | Up | 08:26:32 - 08:56:32 | -1800 |
| Manson/Chelan | 08:41:33 | -63.6 | Dark | Down | 85.6 | 237.9 | Up | 08:26:33 - 08:56:33 | -1827 |
| Wenatchee | 08:41:34 | -64.0 | Dark | Down | 85.9 | 242.6 | Up | 08:26:34 - 08:56:34 | -1882 |
| Ellensburg | 08:41:34 | -64.5 | Dark | Down | 86.3 | 247.0 | Up | 08:26:34 - 08:56:34 | -1930 |
| Yakima | 08:41:34 | -64.9 | Dark | Down | 86.4 | 252.9 | Up | 08:26:34 - 08:56:34 | -1974 |
| Toppenish/White Swan | 08:41:33 | -65.0 | Dark | Down | 86.4 | 256.8 | Up | 08:26:33 - 08:56:33 | -1996 |
| PNWRO | 08:41:28 | -64.9 | Dark | Down | 85.4 | 265.2 | Up | 08:26:28 - 08:56:28 | -2018 |
| The Dalles | 08:41:35 | -65.9 | Dark | Down | 87.0 | 268.3 | Up | 08:26:35 - 08:56:35 | -2091 |
| Maupin | 08:41:34 | -66.3 | Dark | Down | 86.9 | 276.2 | Up | 08:26:34 - 08:56:34 | -2136 |
| Sisters | 08:41:35 | -67.2 | Dark | Down | 87.0 | 293.7 | Up | 08:26:35 - 08:56:35 | -2238 |
| Bend | 08:41:34 | -67.4 | Dark | Down | 86.8 | 296.4 | Up | 08:26:34 - 08:56:34 | -2261 |
| Oregon Observatory | 08:41:35 | -67.6 | Dark | Down | 86.8 | 299.8 | Up | 08:26:35 - 08:56:35 | -2282 |
| Dunrhomin | 08:40:41 | -61.9 | Dark | Down | 74.4 | 296.1 | Up | 08:25:41 - 08:55:41 | -2353 |
| Nikitin | 08:40:41 | -62.0 | Dark | Down | 74.4 | 296.7 | Up | 08:25:41 - 08:55:41 | -2373 |
| CU-SBO | 08:40:41 | -62.1 | Dark | Down | 74.4 | 296.9 | Up | 08:25:41 - 08:55:41 | -2382 |
| Chiloquin | 08:41:35 | -68.9 | Dark | Down | 86.1 | 319.1 | Up | 08:26:35 - 08:56:35 | -2432 |
| Klamath Falls | 08:41:35 | -69.2 | Dark | Down | 85.8 | 321.6 | Up | 08:26:35 - 08:56:35 | -2468 |
| Cedarville | 08:41:29 | -69.2 | Dark | Down | 84.5 | 317.4 | Up | 08:26:29 - 08:56:29 | -2525 |
| Fall River/Burney | 08:41:33 | -70.1 | Dark | Down | 84.7 | 327.4 | Up | 08:26:33 - 08:56:33 | -2593 |
| Gimple | 08:41:30 | -70.7 | Dark | Down | 83.7 | 329.1 | Up | 08:26:30 - 08:56:30 | -2686 |
| Greenville | 08:41:31 | -70.7 | Dark | Down | 83.8 | 329.6 | Up | 08:26:31 - 08:56:31 | -2687 |
| Quincy | 08:41:31 | -70.9 | Dark | Down | 83.6 | 330.4 | Up | 08:26:31 - 08:56:31 | -2709 |
| Portola | 08:41:29 | -70.8 | Dark | Down | 83.3 | 328.6 | Up | 08:26:29 - 08:56:29 | -2717 |
| Reno | 08:41:27 | -70.7 | Dark | Down | 82.8 | 326.7 | Up | 08:26:27 - 08:56:27 | -2737 |
| Carson City | 08:41:26 | -71.0 | Dark | Down | 82.5 | 328.2 | Up | 08:26:26 - 08:56:26 | -2776 |
| Yerington | 08:41:24 | -70.9 | Dark | Down | 82.1 | 326.3 | Up | 08:26:24 - 08:56:24 | -2788 |
| Gardnerville | 08:41:26 | -71.2 | Dark | Down | 82.3 | 328.9 | Up | 08:26:26 - 08:56:26 | -2802 |
| Hawthorne | 08:41:22 | -71.0 | Dark | Down | 81.5 | 326.1 | Up | 08:26:22 - 08:56:22 | -2831 |
| Lee Vining | 08:41:23 | -71.6 | Dark | Down | 81.2 | 329.9 | Up | 08:26:23 - 08:56:23 | -2900 |
| Bishop | 08:41:20 | -71.7 | Dark | Down | 80.4 | 329.2 | Up | 08:26:20 - 08:56:20 | -2953 |
| Beatty | 08:41:15 | -71.1 | Dark | Down | 79.3 | 325.5 | Up | 08:26:15 - 08:56:15 | -2976 |
| Patrick | 08:41:04 | -70.2 | Dark | Down | 76.7 | 322.5 | Up | 08:26:04 - 08:56:04 | -3080 |
| Laughlin/Bullhead City | 08:41:06 | -70.8 | Dark | Down | 76.9 | 324.7 | Up | 08:26:06 - 08:56:06 | -3120 |
| Lake Havasu City | 08:41:05 | -71.0 | Dark | Down | 76.2 | 325.8 | Up | 08:26:05 - 08:56:05 | -3187 |
| George/Scottsdale | 08:40:55 | -69.7 | Dark | Down | 74.4 | 322.6 | Up | 08:25:55 - 08:55:55 | -3215 |
| Wildwood | 08:41:19 | -74.1 | Dark | Down | 77.5 | 337.4 | Up | 08:26:19 - 08:56:19 | -3309 |
| Idyllwild | 08:41:12 | -73.1 | Dark | Down | 76.6 | 333.0 | Up | 08:26:12 - 08:56:12 | -3315 |
| Calipatria | 08:41:07 | -72.6 | Dark | Down | 75.6 | 331.3 | Up | 08:26:07 - 08:56:07 | -3357 |
| Yuma | 08:41:03 | -72.2 | Dark | Down | 74.8 | 330.1 | Up | 08:26:03 - 08:56:03 | -3385 |
Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.
Do not use the listing below for the RECON CPC 1100 telescopes. This is provided for other non-team facilities.
Star training set for 181855, (2026/12/13 08:42UT) Object RA Dec mag sep mel Pollux 07:45:17.9 +28:01:33 1.1 28.98 164 34Bet Aur 05:59:31.6 +44:56:51 1.9 2.10 138 35Pi Aur 05:59:56.1 +45:56:12 5.9 2.16 137 PPM 048461 05:48:43.9 +45:14:13 8.0 0.24 136 PPM 048442 05:47:06.0 +45:24:02 9.7 0.15 135 181855 05:47:56.2 +45:25:44 15.7 136 Positions are for J2000
Event circumstances last updated at 2024/06/10 01:53:12 UT
Marc W. Buie, Southwest Research Institute