Event between 98WS31 and star GA1200:02185419 with event index number of 1238709
Geocentric closest approach at 2023/01/04 04:22:45 UTC
J2000 position of star is 06:00:30.3 +30:07:52
Equinox of date position of star is 06:01:57.9 +30:07:50
Stellar brightness G=16.8,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 18 degrees from the moon.
Moon is 93% illuminated.
TNO apparent brightness V=23.5
[RECON map]
TNO is 33.2 AU from the Sun
and 32.2 AU from the Earth.
The TNO is moving 24.0
km/sec on the sky relative to the star, or,
3.7 arcsec/hr.
The 1-sigma error in the time of the event is 317 seconds.
The 1-sigma cross-track error in the shadow position is
1204 km.
The sky-plane scale is
23369.9 km/arcsec.
The TNO has an absolute magnitude Hv=8.3
Diameter=134.3 km assuming a 5% albedo -- 5.6 sec chord
Diameter=54.8 km assuming a 30% albedo -- 2.3 sec chord
Dynamical classification is 3:2E
Star training set for 98WS31, (2023/01/04 04:37UT) Object RA Dec mag sep mel Betelgeuse 05:56:25.1 +07:24:34 0.4 22.76 24 Alnath 05:27:44.9 +28:37:29 1.6 7.61 10 PPM 071108 06:02:39.2 +31:02:00 6.0 0.91 18 PPM 071080 06:01:05.1 +30:00:17 8.5 0.23 17 PPM 071085 06:01:23.6 +30:11:08 9.8 0.14 17 PPM 071099 06:02:06.0 +30:05:00 11.1 0.05 17 98WS31 06:01:58.9 +30:07:50 16.8 18 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
2.8 sigma about the mid-time.
The median site spacing is 29.2 km
RECON observability=1.0 and success probability=35.9%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Kamloops | 04:24:33 | -39.1 | Dark | Up | 53.4 | 108.4 | Up | 04:09:33 - 04:39:33 | 2065 |
| Kelowna | 04:24:33 | -39.9 | Dark | Up | 54.2 | 108.3 | Up | 04:09:33 - 04:39:33 | 1967 |
| Peachland | 04:24:34 | -39.7 | Dark | Up | 54.1 | 107.8 | Up | 04:09:34 - 04:39:34 | 1964 |
| Summerland | 04:24:34 | -39.8 | Dark | Up | 54.2 | 107.7 | Up | 04:09:34 - 04:39:34 | 1948 |
| Victoria | 04:24:45 | -37.6 | Dark | Up | 52.1 | 102.7 | Up | 04:09:45 - 04:39:45 | 1944 |
| Penticton | 04:24:34 | -39.9 | Dark | Up | 54.3 | 107.8 | Up | 04:09:34 - 04:39:34 | 1939 |
| Oliver | 04:24:35 | -39.9 | Dark | Up | 54.4 | 107.3 | Up | 04:09:35 - 04:39:35 | 1906 |
| Sleaford | 04:23:56 | -47.1 | Dark | Up | 60.6 | 128.0 | Up | 04:08:56 - 04:38:56 | 1901 |
| Anarchist Mountain Observatory | 04:24:35 | -40.1 | Dark | Up | 54.6 | 107.3 | Up | 04:09:35 - 04:39:35 | 1885 |
| Tonasket | 04:24:36 | -40.1 | Dark | Up | 54.6 | 106.8 | Up | 04:09:36 - 04:39:36 | 1858 |
| Okanogan | 04:24:37 | -40.1 | Dark | Up | 54.6 | 106.2 | Up | 04:09:37 - 04:39:37 | 1829 |
| Brewster | 04:24:38 | -40.0 | Dark | Up | 54.6 | 105.6 | Up | 04:09:38 - 04:39:38 | 1809 |
| Manson/Chelan | 04:24:39 | -39.8 | Dark | Up | 54.4 | 105.0 | Up | 04:09:39 - 04:39:39 | 1799 |
| Wenatchee | 04:24:41 | -39.8 | Dark | Up | 54.4 | 104.2 | Up | 04:09:41 - 04:39:41 | 1758 |
| Ellensburg | 04:24:43 | -39.7 | Dark | Up | 54.3 | 103.4 | Up | 04:09:43 - 04:39:43 | 1724 |
| Yakima | 04:24:43 | -39.8 | Dark | Up | 54.4 | 102.8 | Up | 04:09:43 - 04:39:43 | 1686 |
| Toppenish/White Swan | 04:24:44 | -39.9 | Dark | Up | 54.6 | 102.7 | Up | 04:09:44 - 04:39:44 | 1661 |
| Goldendale | 04:24:46 | -39.7 | Dark | Up | 54.4 | 101.6 | Up | 04:09:46 - 04:39:46 | 1619 |
| The Dalles | 04:24:47 | -39.5 | Dark | Up | 54.2 | 100.9 | Up | 04:09:47 - 04:39:47 | 1607 |
| PNWRO | 04:24:41 | -41.0 | Dark | Up | 55.7 | 103.6 | Up | 04:09:41 - 04:39:41 | 1586 |
| Maupin | 04:24:48 | -39.6 | Dark | Up | 54.4 | 100.5 | Up | 04:09:48 - 04:39:48 | 1564 |
| Sisters | 04:24:51 | -39.4 | Dark | Up | 54.2 | 98.8 | Up | 04:09:51 - 04:39:51 | 1493 |
| Bend | 04:24:51 | -39.6 | Dark | Up | 54.4 | 98.7 | Up | 04:09:51 - 04:39:51 | 1463 |
| Oregon Observatory | 04:24:52 | -39.5 | Dark | Up | 54.3 | 98.4 | Up | 04:09:52 - 04:39:52 | 1450 |
| North Lake | 04:24:52 | -39.9 | Dark | Up | 54.8 | 97.9 | Up | 04:09:52 - 04:39:52 | 1372 |
| Chiloquin | 04:24:56 | -39.3 | Dark | Up | 54.2 | 96.2 | Up | 04:09:56 - 04:39:56 | 1334 |
| Klamath Falls | 04:24:56 | -39.4 | Dark | Up | 54.3 | 95.8 | Up | 04:09:56 - 04:39:56 | 1298 |
| Lakeview | 04:24:53 | -40.4 | Dark | Up | 55.4 | 96.9 | Up | 04:09:53 - 04:39:53 | 1253 |
| Cedarville | 04:24:54 | -40.6 | Dark | Up | 55.6 | 96.1 | Up | 04:09:54 - 04:39:54 | 1183 |
| Fall River/Burney | 04:24:58 | -39.8 | Dark | Up | 54.7 | 94.5 | Up | 04:09:58 - 04:39:58 | 1171 |
| Susanville | 04:24:57 | -40.4 | Dark | Up | 55.3 | 94.1 | Up | 04:09:57 - 04:39:57 | 1086 |
| Greenville | 04:24:58 | -40.2 | Dark | Up | 55.1 | 93.5 | Up | 04:09:58 - 04:39:58 | 1068 |
| Gimple | 04:24:58 | -40.2 | Dark | Up | 55.2 | 93.6 | Up | 04:09:58 - 04:39:58 | 1065 |
| Quincy | 04:24:59 | -40.2 | Dark | Up | 55.1 | 93.2 | Up | 04:09:59 - 04:39:59 | 1047 |
| Portola | 04:24:58 | -40.5 | Dark | Up | 55.5 | 93.4 | Up | 04:09:58 - 04:39:58 | 1021 |
| Reno | 04:24:57 | -41.0 | Dark | Up | 56.0 | 93.4 | Up | 04:09:57 - 04:39:57 | 975 |
| Carson City | 04:24:57 | -41.1 | Dark | Up | 56.1 | 92.9 | Up | 04:09:57 - 04:39:57 | 938 |
| Gardnerville | 04:24:58 | -41.1 | Dark | Up | 56.1 | 92.6 | Up | 04:09:58 - 04:39:58 | 913 |
| Yerington | 04:24:56 | -41.6 | Dark | Up | 56.5 | 93.1 | Up | 04:09:56 - 04:39:56 | 900 |
| Hawthorne | 04:24:55 | -42.0 | Dark | Up | 57.0 | 92.7 | Up | 04:09:55 - 04:39:55 | 838 |
| Lee Vining | 04:24:58 | -41.7 | Dark | Up | 56.6 | 91.5 | Up | 04:09:58 - 04:39:58 | 795 |
| Tonopah | 04:24:52 | -43.1 | Dark | Up | 58.1 | 93.0 | Up | 04:09:52 - 04:39:52 | 750 |
| Bishop | 04:24:57 | -42.3 | Dark | Up | 57.2 | 91.1 | Up | 04:09:57 - 04:39:57 | 713 |
| Dunrhomin | 04:24:13 | -51.9 | Dark | Up | 66.8 | 107.8 | Up | 04:09:13 - 04:39:13 | 684 |
| CU-SBO | 04:24:13 | -51.9 | Dark | Up | 66.8 | 107.1 | Up | 04:09:13 - 04:39:13 | 660 |
| Beatty | 04:24:53 | -43.6 | Dark | Up | 58.5 | 91.4 | Up | 04:09:53 - 04:39:53 | 618 |
| Indian Springs | 04:24:50 | -44.4 | Dark | Up | 59.4 | 91.5 | Up | 04:09:50 - 04:39:50 | 554 |
| Henderson | 04:24:49 | -45.0 | Dark | Up | 59.9 | 91.0 | Up | 04:09:49 - 04:39:49 | 480 |
| Wildwood | 04:25:03 | -42.1 | Dark | Up | 57.0 | 85.9 | Up | 04:10:03 - 04:40:03 | 384 |
| Patrick | 04:24:47 | -46.0 | Dark | Up | 60.9 | 90.6 | Up | 04:09:47 - 04:39:47 | 384 |
| Laughlin/Bullhead City | 04:24:49 | -45.4 | Dark | Up | 60.3 | 89.8 | Up | 04:09:49 - 04:39:49 | 378 |
| Kingman/Dolan Springs | 04:24:48 | -45.8 | Dark | Up | 60.7 | 90.1 | Up | 04:09:48 - 04:39:48 | 366 |
| Mohave Valley | 04:24:50 | -45.4 | Dark | Up | 60.3 | 89.3 | Up | 04:09:50 - 04:39:50 | 349 |
| Lake Havasu City | 04:24:50 | -45.6 | Dark | Up | 60.5 | 88.7 | Up | 04:09:50 - 04:39:50 | 301 |
| Idyllwild | 04:24:58 | -43.7 | Dark | Up | 58.5 | 86.2 | Up | 04:09:58 - 04:39:58 | 291 |
| Parker | 04:24:50 | -45.7 | Dark | Up | 60.5 | 88.1 | Up | 04:09:50 - 04:39:50 | 263 |
| Calipatria | 04:24:55 | -44.7 | Dark | Up | 59.4 | 85.8 | Up | 04:09:55 - 04:39:55 | 192 |
| George/Scottsdale | 04:24:43 | -47.7 | Dark | Up | 62.5 | 88.6 | Up | 04:09:43 - 04:39:43 | 152 |
| Yuma | 04:24:53 | -45.4 | Dark | Up | 60.2 | 85.4 | Up | 04:09:53 - 04:39:53 | 121 |
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 98WS31, (2023/01/04 04:37UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 22.76 24 Alnath 05:26:17.5 +28:36:23 1.6 7.61 10 PPM 071108 06:01:10.0 +31:02:04 6.0 0.91 18 PPM 071080 05:59:36.6 +30:00:18 8.5 0.23 17 PPM 071085 05:59:55.0 +30:11:09 9.8 0.14 17 PPM 071099 06:00:37.4 +30:05:03 11.1 0.05 17 98WS31 06:00:30.3 +30:07:52 16.8 17 Positions are for J2000
Event circumstances last updated at 2022/10/03 04:15:23 UT
Marc W. Buie, Southwest Research Institute