Event between (181855) 98WT31 and star GA1300:02236451 with event index number of 363581
Geocentric closest approach at 2020/10/28 12:43:19 UTC
J2000 position of star is 05:00:58.8 +40:52:22
Equinox of date position of star is 05:02:20.3 +40:54:00
Stellar brightness G=17.0,
use SENSEUP=128
Star is 79 degrees from the moon.
Moon is 92% illuminated.
TNO apparent brightness V=23.1
[RECON map]
TNO is 37.6 AU from the Sun
and 36.9 AU from the Earth.
The TNO is moving 19.2
km/sec on the sky relative to the star, or,
2.6 arcsec/hr.
The 1-sigma error in the time of the event is 375 seconds.
The 1-sigma cross-track error in the shadow position is
4740 km.
The sky-plane scale is
26758.5 km/arcsec.
The TNO has an absolute magnitude Hv=7.3
Diameter=208.9 km assuming a 5% albedo -- 10.9 sec chord
Diameter=85.3 km assuming a 30% albedo -- 4.4 sec chord
Dynamical classification is SCATEXTD
Star training set for 181855, (2020/10/28 12:43UT) Object RA Dec mag sep mel Aldebaran 04:37:07.1 +16:32:58 0.8 24.96 67 3Iot Aur 04:58:21.2 +33:11:50 2.7 7.75 76 8Zet Aur 05:03:56.3 +41:06:15 3.8 0.35 79 PPM 047655 05:04:34.3 +40:34:52 7.9 0.52 79 PPM 047594 05:02:11.1 +40:54:34 9.5 0.05 79 181855 05:02:26.1 +40:54:07 17.0 79 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
2.4 sigma about the mid-time.
The median site spacing is 14.7 km
RECON observability=1.0 and success probability=7.4%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Kelowna | 12:41:53 | -19.7 | Dark | Down | 65.3 | 261.4 | Up | 12:26:53 - 12:56:53 | 2755 |
| Summerland | 12:41:52 | -19.9 | Dark | Down | 65.5 | 261.8 | Up | 12:26:52 - 12:56:52 | 2719 |
| Penticton | 12:41:52 | -19.9 | Dark | Down | 65.4 | 262.0 | Up | 12:26:52 - 12:56:52 | 2718 |
| Niwot | 12:40:39 | -9.3 | NT | Down | 54.6 | 286.9 | Up | 12:25:39 - 12:55:39 | 2718 |
| SwRI | 12:40:39 | -9.3 | NT | Down | 54.7 | 287.1 | Up | 12:25:39 - 12:55:39 | 2705 |
| Okanagan Falls | 12:41:52 | -19.9 | Dark | Down | 65.5 | 262.4 | Up | 12:26:52 - 12:56:52 | 2702 |
| Oliver | 12:41:51 | -19.9 | Dark | Down | 65.5 | 262.8 | Up | 12:26:51 - 12:56:51 | 2690 |
| Anarchist Mountain Observatory | 12:41:50 | -19.8 | Dark | Down | 65.4 | 263.3 | Up | 12:26:50 - 12:56:50 | 2684 |
| Oroville | 12:41:49 | -19.8 | Dark | Down | 65.4 | 263.4 | Up | 12:26:49 - 12:56:49 | 2675 |
| Tonasket | 12:41:49 | -19.8 | Dark | Down | 65.5 | 263.9 | Up | 12:26:49 - 12:56:49 | 2656 |
| Okanogan | 12:41:48 | -19.9 | Dark | Down | 65.6 | 264.5 | Up | 12:26:48 - 12:56:48 | 2622 |
| Brewster | 12:41:47 | -20.1 | Dark | Down | 65.8 | 264.9 | Up | 12:26:47 - 12:56:47 | 2591 |
| Manson/Chelan | 12:41:48 | -20.3 | Dark | Down | 66.0 | 265.1 | Up | 12:26:48 - 12:56:48 | 2557 |
| Entiat | 12:41:47 | -20.4 | Dark | Down | 66.1 | 265.5 | Up | 12:26:47 - 12:56:47 | 2536 |
| Wenatchee | 12:41:45 | -20.5 | Dark | Down | 66.2 | 266.0 | Up | 12:26:45 - 12:56:45 | 2510 |
| Pasco | 12:41:38 | -19.7 | Dark | Down | 65.4 | 269.5 | Up | 12:26:38 - 12:56:38 | 2470 |
| Ellensburg | 12:41:45 | -20.6 | Dark | Down | 66.4 | 266.7 | Up | 12:26:45 - 12:56:45 | 2466 |
| PNWRO | 12:41:37 | -19.6 | Dark | Down | 65.3 | 270.2 | Up | 12:26:37 - 12:56:37 | 2460 |
| George/Umatilla | 12:41:37 | -19.9 | Dark | Down | 65.6 | 270.1 | Up | 12:26:37 - 12:56:37 | 2432 |
| Yakima | 12:41:44 | -20.7 | Dark | Down | 66.4 | 267.6 | Up | 12:26:44 - 12:56:44 | 2431 |
| Toppenish/White Swan | 12:41:42 | -20.6 | Dark | Down | 66.3 | 268.3 | Up | 12:26:42 - 12:56:42 | 2421 |
| Goldendale | 12:41:41 | -20.9 | Dark | Down | 66.6 | 269.2 | Up | 12:26:41 - 12:56:41 | 2354 |
| The Dalles | 12:41:41 | -21.1 | Dark | Down | 66.9 | 269.5 | Up | 12:26:41 - 12:56:41 | 2318 |
| Maupin | 12:41:40 | -21.1 | Dark | Down | 66.8 | 270.5 | Up | 12:26:40 - 12:56:40 | 2288 |
| Madras/Culver | 12:41:38 | -21.1 | Dark | Down | 66.8 | 271.8 | Up | 12:26:38 - 12:56:38 | 2240 |
| Redmond | 12:41:37 | -21.2 | Dark | Down | 66.8 | 272.6 | Up | 12:26:37 - 12:56:37 | 2207 |
| Sisters | 12:41:37 | -21.5 | Dark | Down | 67.1 | 272.3 | Up | 12:26:37 - 12:56:37 | 2190 |
| Bend | 12:41:36 | -21.3 | Dark | Down | 66.9 | 273.0 | Up | 12:26:36 - 12:56:36 | 2182 |
| Oregon Observatory | 12:41:36 | -21.4 | Dark | Down | 67.0 | 273.3 | Up | 12:26:36 - 12:56:36 | 2161 |
| La Pine/Gilchrist | 12:41:35 | -21.5 | Dark | Down | 67.1 | 273.7 | Up | 12:26:35 - 12:56:35 | 2140 |
| North Lake | 12:41:32 | -21.0 | Dark | Down | 66.6 | 275.1 | Up | 12:26:32 - 12:56:32 | 2132 |
| Paisley | 12:41:30 | -20.8 | Dark | Down | 66.3 | 276.5 | Up | 12:26:30 - 12:56:30 | 2103 |
| Lakeview | 12:41:27 | -20.7 | Dark | Down | 66.1 | 277.7 | Up | 12:26:27 - 12:56:27 | 2069 |
| Chiloquin | 12:41:32 | -21.8 | Dark | Down | 67.2 | 276.2 | Up | 12:26:32 - 12:56:32 | 2027 |
| Cedarville | 12:41:23 | -20.6 | Dark | Down | 65.9 | 279.3 | Up | 12:26:23 - 12:56:23 | 2021 |
| Klamath Falls | 12:41:31 | -21.7 | Dark | Down | 67.1 | 277.0 | Up | 12:26:31 - 12:56:31 | 2002 |
| Tulelake | 12:41:29 | -21.5 | Dark | Down | 66.9 | 277.8 | Up | 12:26:29 - 12:56:29 | 1993 |
| Fall River/Burney | 12:41:26 | -21.5 | Dark | Down | 66.7 | 279.9 | Up | 12:26:26 - 12:56:26 | 1918 |
| Susanville | 12:41:21 | -20.9 | Dark | Down | 66.0 | 281.6 | Up | 12:26:21 - 12:56:21 | 1901 |
| Tonopah | 12:41:02 | -18.3 | Dark | Down | 62.9 | 287.1 | Up | 12:26:02 - 12:56:02 | 1880 |
| Reno | 12:41:15 | -20.3 | Dark | Down | 65.2 | 283.7 | Up | 12:26:15 - 12:56:15 | 1869 |
| Gimple | 12:41:20 | -21.1 | Dark | Down | 66.1 | 282.1 | Up | 12:26:20 - 12:56:20 | 1866 |
| Greenville | 12:41:21 | -21.2 | Dark | Down | 66.2 | 282.1 | Up | 12:26:21 - 12:56:21 | 1862 |
| DCO | 12:40:40 | -14.9 | AT | Down | 58.9 | 292.5 | Up | 12:25:40 - 12:55:40 | 1861 |
| Portola | 12:41:18 | -20.8 | Dark | Down | 65.8 | 282.9 | Up | 12:26:18 - 12:56:18 | 1858 |
| Yerington | 12:41:11 | -19.8 | Dark | Down | 64.6 | 284.9 | Up | 12:26:11 - 12:56:11 | 1856 |
| Patrick | 12:40:42 | -15.5 | AT | Down | 59.6 | 292.0 | Up | 12:25:42 - 12:55:42 | 1845 |
| Quincy | 12:41:20 | -21.2 | Dark | Down | 66.2 | 282.5 | Up | 12:26:20 - 12:56:20 | 1845 |
| Hawthorne | 12:41:08 | -19.4 | Dark | Down | 64.1 | 286.0 | Up | 12:26:08 - 12:56:08 | 1844 |
| Indian Springs | 12:40:52 | -17.0 | AT | Down | 61.3 | 290.0 | Up | 12:25:52 - 12:55:52 | 1840 |
| Carson City | 12:41:15 | -20.3 | Dark | Down | 65.1 | 284.4 | Up | 12:26:15 - 12:56:15 | 1839 |
| Henderson | 12:40:48 | -16.4 | AT | Down | 60.6 | 290.9 | Up | 12:25:48 - 12:55:48 | 1834 |
| Gardnerville | 12:41:13 | -20.2 | Dark | Down | 65.0 | 284.9 | Up | 12:26:13 - 12:56:13 | 1821 |
| Kingman/Dolan Springs | 12:40:43 | -15.6 | AT | Down | 59.6 | 292.4 | Up | 12:25:43 - 12:55:43 | 1816 |
| Beatty | 12:40:56 | -17.9 | AT | Down | 62.2 | 289.3 | Up | 12:25:56 - 12:55:56 | 1807 |
| Searchlight/Boulder City | 12:40:46 | -16.3 | AT | Down | 60.4 | 291.9 | Up | 12:25:46 - 12:55:46 | 1789 |
| Laughlin/Bullhead City | 12:40:43 | -16.0 | AT | Down | 60.0 | 292.4 | Up | 12:25:43 - 12:55:43 | 1784 |
| Lee Vining | 12:41:08 | -19.7 | Dark | Down | 64.3 | 287.0 | Up | 12:26:08 - 12:56:08 | 1769 |
| Mohave Valley | 12:40:43 | -16.0 | AT | Down | 59.9 | 292.8 | Up | 12:25:43 - 12:55:43 | 1761 |
| Bishop | 12:41:03 | -19.2 | Dark | Down | 63.6 | 288.3 | Up | 12:26:03 - 12:56:03 | 1757 |
| Lake Havasu City | 12:40:40 | -15.7 | AT | Down | 59.6 | 293.4 | Up | 12:25:40 - 12:55:40 | 1742 |
| Parker | 12:40:39 | -15.7 | AT | Down | 59.4 | 294.0 | Up | 12:25:39 - 12:55:39 | 1714 |
| Lone Pine | 12:41:00 | -18.9 | Dark | Down | 63.1 | 289.7 | Up | 12:26:00 - 12:56:00 | 1710 |
| Blythe | 12:40:39 | -15.9 | AT | Down | 59.4 | 294.8 | Up | 12:25:39 - 12:55:39 | 1653 |
| Yuma | 12:40:35 | -15.8 | AT | Down | 59.1 | 296.2 | Up | 12:25:35 - 12:55:35 | 1572 |
| Calipatria | 12:40:40 | -16.6 | AT | Down | 59.9 | 295.6 | Up | 12:25:40 - 12:55:40 | 1556 |
| Idyllwild | 12:40:45 | -17.6 | AT | Down | 61.0 | 294.7 | Up | 12:25:45 - 12:55:45 | 1539 |
| Wildwood | 12:40:52 | -19.2 | Dark | Down | 62.6 | 294.3 | Up | 12:25:52 - 12:55:52 | 1463 |
| CPSLO | 12:41:03 | -20.9 | Dark | Down | 64.6 | 292.2 | Up | 12:26:03 - 12:56:03 | 1455 |
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, (2020/10/28 12:43UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:30 0.8 24.96 67 3Iot Aur 04:56:59.6 +33:09:58 2.7 7.75 76 8Zet Aur 05:02:28.7 +41:04:33 3.8 0.35 79 PPM 047655 05:03:07.2 +40:33:10 7.9 0.52 79 PPM 047594 05:00:43.7 +40:52:49 9.5 0.05 79 181855 05:00:58.8 +40:52:22 17.0 79 Positions are for J2000
Event circumstances last updated at 2019/06/08 00:33:05 UT
Marc W. Buie, Southwest Research Institute