Event between (181855) 98WT31 and star GA1300:02320570 with event index number of 1106146
Geocentric closest approach at 2021/12/07 12:02:05 UTC
J2000 position of star is 05:04:45.9 +41:48:58
Equinox of date position of star is 05:06:18.8 +41:50:41
Stellar brightness G=16.8,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 138 degrees from the moon.
Moon is 15% illuminated.
TNO apparent brightness V=23.5
[RECON map]
TNO is 37.6 AU from the Sun
and 36.7 AU from the Earth.
The TNO is moving 25.4
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 204 seconds.
The 1-sigma cross-track error in the shadow position is
3058 km.
The sky-plane scale is
26588.1 km/arcsec.
The TNO has an absolute magnitude Hv=7.7
Diameter=173.8 km assuming a 5% albedo -- 6.8 sec chord
Diameter=70.9 km assuming a 30% albedo -- 2.8 sec chord
Dynamical classification is SCATEXTD
Star training set for 181855, (2021/12/07 12:09UT) Object RA Dec mag sep mel Aldebaran 04:37:10.9 +16:33:06 0.8 26.05 129 3Iot Aur 04:58:25.5 +33:11:56 2.7 8.79 136 PPM 047658 05:04:51.1 +41:28:15 6.2 0.46 137 PPM 047692 05:06:31.6 +41:54:31 7.7 0.08 137 181855 05:06:18.8 +41:50:41 16.8 138 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
4.4 sigma about the mid-time.
The median site spacing is 15.1 km
RECON observability=1.0 and success probability=17.5%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Sleaford | 11:59:37 | -26.1 | Dark | Down | 40.6 | 289.2 | Up | 11:44:37 - 12:14:37 | 2688 |
| Kamloops | 11:59:48 | -35.1 | Dark | Down | 48.8 | 281.7 | Up | 11:44:48 - 12:14:48 | 1969 |
| Kelowna | 11:59:44 | -34.6 | Dark | Down | 48.1 | 283.1 | Up | 11:44:44 - 12:14:44 | 1940 |
| Peachland | 11:59:44 | -34.8 | Dark | Down | 48.3 | 283.1 | Up | 11:44:44 - 12:14:44 | 1918 |
| Summerland | 11:59:44 | -34.8 | Dark | Down | 48.2 | 283.3 | Up | 11:44:44 - 12:14:44 | 1910 |
| Penticton | 11:59:44 | -34.7 | Dark | Down | 48.1 | 283.4 | Up | 11:44:44 - 12:14:44 | 1909 |
| Oliver | 11:59:43 | -34.8 | Dark | Down | 48.0 | 283.8 | Up | 11:44:43 - 12:14:43 | 1880 |
| Anarchist Mountain Observatory | 11:59:42 | -34.7 | Dark | Down | 47.8 | 284.1 | Up | 11:44:42 - 12:14:42 | 1875 |
| Dunrhomin | 11:59:00 | -24.3 | Dark | Down | 35.4 | 298.0 | Up | 11:44:00 - 12:14:00 | 1873 |
| Tonasket | 11:59:41 | -34.7 | Dark | Down | 47.8 | 284.4 | Up | 11:44:41 - 12:14:41 | 1846 |
| Okanogan | 11:59:40 | -34.9 | Dark | Down | 47.8 | 284.6 | Up | 11:44:40 - 12:14:40 | 1812 |
| Brewster | 11:59:40 | -35.0 | Dark | Down | 47.9 | 284.8 | Up | 11:44:40 - 12:14:40 | 1781 |
| Manson/Chelan | 11:59:40 | -35.3 | Dark | Down | 48.1 | 284.8 | Up | 11:44:40 - 12:14:40 | 1747 |
| Wenatchee | 11:59:39 | -35.4 | Dark | Down | 48.1 | 285.3 | Up | 11:44:39 - 12:14:39 | 1700 |
| Victoria | 11:59:46 | -37.3 | Dark | Down | 50.3 | 282.3 | Up | 11:44:46 - 12:14:46 | 1664 |
| Pasco | 11:59:34 | -34.7 | Dark | Down | 47.0 | 287.1 | Up | 11:44:34 - 12:14:34 | 1656 |
| Ellensburg | 11:59:38 | -35.6 | Dark | Down | 48.1 | 285.6 | Up | 11:44:38 - 12:14:38 | 1656 |
| PNWRO | 11:59:33 | -34.5 | Dark | Down | 46.8 | 287.5 | Up | 11:44:33 - 12:14:33 | 1646 |
| Yakima | 11:59:37 | -35.7 | Dark | Down | 48.0 | 286.0 | Up | 11:44:37 - 12:14:37 | 1621 |
| Toppenish/White Swan | 11:59:36 | -35.5 | Dark | Down | 47.8 | 286.3 | Up | 11:44:36 - 12:14:36 | 1610 |
| Goldendale | 11:59:35 | -35.9 | Dark | Down | 48.0 | 286.7 | Up | 11:44:35 - 12:14:35 | 1544 |
| The Dalles | 11:59:35 | -36.2 | Dark | Down | 48.2 | 286.8 | Up | 11:44:35 - 12:14:35 | 1508 |
| Maupin | 11:59:34 | -36.1 | Dark | Down | 48.0 | 287.2 | Up | 11:44:34 - 12:14:34 | 1477 |
| Redmond | 11:59:32 | -36.2 | Dark | Down | 47.8 | 288.2 | Up | 11:44:32 - 12:14:32 | 1395 |
| Sisters | 11:59:33 | -36.5 | Dark | Down | 48.0 | 287.9 | Up | 11:44:33 - 12:14:33 | 1379 |
| Bend | 11:59:32 | -36.3 | Dark | Down | 47.8 | 288.3 | Up | 11:44:32 - 12:14:32 | 1370 |
| Oregon Observatory | 11:59:31 | -36.4 | Dark | Down | 47.8 | 288.4 | Up | 11:44:31 - 12:14:31 | 1349 |
| La Pine/Gilchrist | 11:59:31 | -36.5 | Dark | Down | 47.8 | 288.6 | Up | 11:44:31 - 12:14:31 | 1329 |
| North Lake | 11:59:29 | -36.1 | Dark | Down | 47.2 | 289.3 | Up | 11:44:29 - 12:14:29 | 1319 |
| Paisley | 11:59:27 | -35.8 | Dark | Down | 46.8 | 290.0 | Up | 11:44:27 - 12:14:27 | 1288 |
| Lakeview | 11:59:25 | -35.7 | Dark | Down | 46.5 | 290.6 | Up | 11:44:25 - 12:14:25 | 1253 |
| Chiloquin | 11:59:28 | -36.8 | Dark | Down | 47.7 | 289.6 | Up | 11:44:28 - 12:14:28 | 1215 |
| Cedarville | 11:59:23 | -35.6 | Dark | Down | 46.2 | 291.3 | Up | 11:44:23 - 12:14:23 | 1204 |
| Klamath Falls | 11:59:28 | -36.8 | Dark | Down | 47.5 | 290.0 | Up | 11:44:28 - 12:14:28 | 1189 |
| Fall River/Burney | 11:59:24 | -36.5 | Dark | Down | 46.8 | 291.3 | Up | 11:44:24 - 12:14:24 | 1103 |
| Susanville | 11:59:21 | -36.0 | Dark | Down | 46.1 | 292.2 | Up | 11:44:21 - 12:14:21 | 1083 |
| Tonopah | 11:59:10 | -33.2 | Dark | Down | 42.7 | 295.4 | Up | 11:44:10 - 12:14:10 | 1050 |
| Gimple | 11:59:21 | -36.1 | Dark | Down | 46.1 | 292.4 | Up | 11:44:21 - 12:14:21 | 1049 |
| Reno | 11:59:18 | -35.3 | Dark | Down | 45.2 | 293.3 | Up | 11:44:18 - 12:14:18 | 1048 |
| Greenville | 11:59:21 | -36.2 | Dark | Down | 46.2 | 292.4 | Up | 11:44:21 - 12:14:21 | 1045 |
| Portola | 11:59:20 | -35.8 | Dark | Down | 45.7 | 292.9 | Up | 11:44:20 - 12:14:20 | 1039 |
| Yerington | 11:59:15 | -34.8 | Dark | Down | 44.5 | 294.0 | Up | 11:44:15 - 12:14:15 | 1032 |
| Quincy | 11:59:21 | -36.2 | Dark | Down | 46.1 | 292.6 | Up | 11:44:21 - 12:14:21 | 1027 |
| Hawthorne | 11:59:13 | -34.4 | Dark | Down | 43.9 | 294.6 | Up | 11:44:13 - 12:14:13 | 1018 |
| Carson City | 11:59:17 | -35.3 | Dark | Down | 45.0 | 293.7 | Up | 11:44:17 - 12:14:17 | 1018 |
| Indian Springs | 11:59:04 | -31.9 | Dark | Down | 41.0 | 297.1 | Up | 11:44:04 - 12:14:04 | 1003 |
| Patrick | 11:58:59 | -30.3 | Dark | Down | 39.2 | 298.4 | Up | 11:43:59 - 12:13:59 | 1002 |
| Gardnerville | 11:59:16 | -35.2 | Dark | Down | 44.9 | 293.9 | Up | 11:44:16 - 12:14:16 | 998 |
| Henderson | 11:59:02 | -31.3 | Dark | Down | 40.3 | 297.7 | Up | 11:44:02 - 12:14:02 | 995 |
| Beatty | 11:59:07 | -32.8 | Dark | Down | 41.9 | 296.5 | Up | 11:44:07 - 12:14:07 | 974 |
| Kingman/Dolan Springs | 11:58:59 | -30.5 | Dark | Down | 39.2 | 298.5 | Up | 11:43:59 - 12:13:59 | 973 |
| George/Scottsdale | 11:58:52 | -28.5 | Dark | Down | 36.9 | 300.1 | Up | 11:43:52 - 12:13:52 | 971 |
| Lee Vining | 11:59:13 | -34.7 | Dark | Down | 44.0 | 295.0 | Up | 11:44:13 - 12:14:13 | 944 |
| Laughlin/Bullhead City | 11:58:59 | -30.9 | Dark | Down | 39.6 | 298.4 | Up | 11:43:59 - 12:13:59 | 942 |
| Bishop | 11:59:10 | -34.1 | Dark | Down | 43.3 | 295.7 | Up | 11:44:10 - 12:14:10 | 929 |
| Mohave Valley | 11:58:59 | -30.8 | Dark | Down | 39.4 | 298.6 | Up | 11:43:59 - 12:13:59 | 919 |
| Lake Havasu City | 11:58:57 | -30.6 | Dark | Down | 39.1 | 299.0 | Up | 11:43:57 - 12:13:57 | 898 |
| Parker | 11:58:56 | -30.5 | Dark | Down | 38.9 | 299.2 | Up | 11:43:56 - 12:13:56 | 870 |
| Blythe | 11:58:56 | -30.7 | Dark | Down | 38.8 | 299.5 | Up | 11:43:56 - 12:13:56 | 808 |
| Yuma | 11:58:54 | -30.6 | Dark | Down | 38.4 | 300.1 | Up | 11:43:54 - 12:13:54 | 725 |
| Calipatria | 11:58:56 | -31.4 | Dark | Down | 39.3 | 299.7 | Up | 11:43:56 - 12:13:56 | 713 |
| Idyllwild | 11:59:00 | -32.4 | Dark | Down | 40.4 | 299.0 | Up | 11:44:00 - 12:14:00 | 700 |
| Wildwood | 11:59:04 | -34.0 | Dark | Down | 42.0 | 298.3 | Up | 11:44:04 - 12:14:04 | 629 |
| CPSLO | 11:59:10 | -35.8 | Dark | Down | 44.0 | 296.9 | Up | 11:44:10 - 12:14:10 | 629 |
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, (2021/12/07 12:09UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:29 0.8 26.05 129 3Iot Aur 04:56:59.6 +33:09:58 2.7 8.79 136 PPM 047658 05:03:18.5 +41:26:29 6.2 0.46 137 PPM 047692 05:04:58.6 +41:52:48 7.7 0.08 137 181855 05:04:45.9 +41:48:58 16.8 137 Positions are for J2000
Event circumstances last updated at 2021/12/05 01:59:10 UT
Marc W. Buie, Southwest Research Institute