Event between 98WS31 and star GA1200:02320131 with event index number of 1327187
Geocentric closest approach at 2024/01/10 07:18:56 UTC
J2000 position of star is 06:09:23.7 +30:10:15
Equinox of date position of star is 06:10:55.5 +30:09:53
Stellar brightness G=16.2,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 178 degrees from the moon.
Moon is 2% illuminated.
Apparent brightness V=23.5
[RECON map]
Object is 33.3 AU from the Sun
and 32.4 AU from the Earth.
Apparent velocity is 23.5
km/sec on the sky relative to the star, or,
3.6 arcsec/hr.
The 1-sigma error in the time of the event is 386 seconds.
The 1-sigma cross-track error in the shadow position is
1468 km.
The sky-plane scale is
23495.6 km/arcsec.
The object has an absolute magnitude Hv=8.3
Diameter=134.3 km assuming a 5% albedo -- 5.7 sec chord
Diameter=54.8 km assuming a 30% albedo -- 2.3 sec chord
Dynamical classification is 3:2E
Star training set for 98WS31, (2024/01/10 07:19UT) Object RA Dec mag sep mel Pollux 07:46:47.1 +27:57:58 1.1 21.02 160 Alnath 05:27:48.8 +28:37:32 1.6 9.51 169 44Kap Aur 06:16:54.6 +29:29:14 4.3 1.46 179 PPM 071326 06:12:52.4 +30:39:59 8.5 0.65 177 PPM 071300 06:11:43.8 +30:01:21 9.3 0.22 178 PPM 071274 06:10:45.6 +30:01:24 10.3 0.15 178 98WS31 06:10:56.2 +30:09:53 16.2 178 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
2.3 sigma about the mid-time.
The median site spacing is 37.0 km
RECON observability=1.0 and success probability=0.3%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Sleaford | 07:17:57 | -59.9 | Dark | Down | 63.4 | 222.6 | Up | 07:02:57 - 07:32:57 | 5596 |
| Kamloops | 07:18:37 | -59.7 | Dark | Down | 69.0 | 195.2 | Up | 07:03:37 - 07:33:37 | 5357 |
| Kelowna | 07:18:34 | -60.7 | Dark | Down | 69.6 | 198.0 | Up | 07:03:34 - 07:33:34 | 5274 |
| Peachland | 07:18:35 | -60.7 | Dark | Down | 69.7 | 197.4 | Up | 07:03:35 - 07:33:35 | 5262 |
| Summerland | 07:18:34 | -60.9 | Dark | Down | 69.9 | 197.7 | Up | 07:03:34 - 07:33:34 | 5247 |
| Penticton | 07:18:34 | -61.0 | Dark | Down | 69.9 | 198.0 | Up | 07:03:34 - 07:33:34 | 5240 |
| Oliver | 07:18:34 | -61.3 | Dark | Down | 70.3 | 198.3 | Up | 07:03:34 - 07:33:34 | 5203 |
| Anarchist Mountain Observatory | 07:18:34 | -61.5 | Dark | Down | 70.4 | 199.0 | Up | 07:03:34 - 07:33:34 | 5186 |
| Victoria | 07:18:46 | -60.8 | Dark | Down | 71.5 | 188.9 | Up | 07:03:46 - 07:33:46 | 5127 |
| Okanogan | 07:18:34 | -62.0 | Dark | Down | 71.0 | 199.0 | Up | 07:03:34 - 07:33:34 | 5117 |
| Brewster | 07:18:34 | -62.2 | Dark | Down | 71.3 | 198.7 | Up | 07:03:34 - 07:33:34 | 5088 |
| Manson/Chelan | 07:18:36 | -62.3 | Dark | Down | 71.6 | 198.0 | Up | 07:03:36 - 07:33:36 | 5065 |
| Wenatchee | 07:18:36 | -62.7 | Dark | Down | 72.1 | 198.0 | Up | 07:03:36 - 07:33:36 | 5014 |
| Ellensburg | 07:18:37 | -63.0 | Dark | Down | 72.5 | 197.8 | Up | 07:03:37 - 07:33:37 | 4970 |
| Yakima | 07:18:36 | -63.4 | Dark | Down | 72.9 | 198.1 | Up | 07:03:36 - 07:33:36 | 4926 |
| Toppenish/White Swan | 07:18:36 | -63.6 | Dark | Down | 73.1 | 198.8 | Up | 07:03:36 - 07:33:36 | 4903 |
| PNWRO | 07:18:31 | -64.4 | Dark | Down | 73.1 | 203.5 | Up | 07:03:31 - 07:33:31 | 4869 |
| The Dalles | 07:18:38 | -64.0 | Dark | Down | 74.0 | 197.3 | Up | 07:03:38 - 07:33:38 | 4819 |
| Maupin | 07:18:38 | -64.4 | Dark | Down | 74.4 | 198.1 | Up | 07:03:38 - 07:33:38 | 4774 |
| Sisters | 07:18:40 | -65.0 | Dark | Down | 75.3 | 197.5 | Up | 07:03:40 - 07:33:40 | 4678 |
| Bend | 07:18:38 | -65.3 | Dark | Down | 75.5 | 198.7 | Up | 07:03:38 - 07:33:38 | 4653 |
| Oregon Observatory | 07:18:39 | -65.4 | Dark | Down | 75.7 | 198.4 | Up | 07:03:39 - 07:33:39 | 4634 |
| Chiloquin | 07:18:40 | -66.4 | Dark | Down | 77.0 | 198.7 | Up | 07:03:40 - 07:33:40 | 4491 |
| Klamath Falls | 07:18:40 | -66.7 | Dark | Down | 77.3 | 199.5 | Up | 07:03:40 - 07:33:40 | 4454 |
| Cedarville | 07:18:34 | -67.9 | Dark | Down | 77.5 | 206.6 | Up | 07:03:34 - 07:33:34 | 4382 |
| Dunrhomin | 07:17:41 | -71.6 | Dark | Down | 70.0 | 246.3 | Up | 07:02:41 - 07:32:41 | 4366 |
| Nikitin | 07:17:41 | -71.8 | Dark | Down | 70.1 | 246.8 | Up | 07:02:41 - 07:32:41 | 4346 |
| CU-SBO | 07:17:42 | -71.9 | Dark | Down | 70.2 | 246.8 | Up | 07:02:42 - 07:32:42 | 4338 |
| Fall River/Burney | 07:18:38 | -67.8 | Dark | Down | 78.3 | 202.9 | Up | 07:03:38 - 07:33:38 | 4326 |
| Greenville | 07:18:36 | -68.7 | Dark | Down | 79.0 | 206.6 | Up | 07:03:36 - 07:33:36 | 4228 |
| Gimple | 07:18:36 | -68.8 | Dark | Down | 79.0 | 207.0 | Up | 07:03:36 - 07:33:36 | 4228 |
| Quincy | 07:18:36 | -68.9 | Dark | Down | 79.2 | 207.1 | Up | 07:03:36 - 07:33:36 | 4206 |
| Portola | 07:18:34 | -69.2 | Dark | Down | 79.1 | 209.4 | Up | 07:03:34 - 07:33:34 | 4194 |
| Reno | 07:18:32 | -69.7 | Dark | Down | 79.1 | 212.7 | Up | 07:03:32 - 07:33:32 | 4166 |
| Carson City | 07:18:32 | -70.0 | Dark | Down | 79.4 | 213.9 | Up | 07:03:32 - 07:33:32 | 4127 |
| Yerington | 07:18:30 | -70.5 | Dark | Down | 79.3 | 217.0 | Up | 07:03:30 - 07:33:30 | 4108 |
| Gardnerville | 07:18:31 | -70.2 | Dark | Down | 79.6 | 214.8 | Up | 07:03:31 - 07:33:31 | 4101 |
| Hawthorne | 07:18:27 | -71.1 | Dark | Down | 79.4 | 220.5 | Up | 07:03:27 - 07:33:27 | 4059 |
| Lee Vining | 07:18:29 | -71.3 | Dark | Down | 80.1 | 220.6 | Up | 07:03:29 - 07:33:29 | 3995 |
| Bishop | 07:18:26 | -72.1 | Dark | Down | 80.1 | 225.8 | Up | 07:03:26 - 07:33:26 | 3932 |
| Beatty | 07:18:21 | -73.2 | Dark | Down | 79.4 | 233.3 | Up | 07:03:21 - 07:33:21 | 3890 |
| Patrick | 07:18:09 | -75.6 | Dark | Down | 78.2 | 247.3 | Up | 07:03:09 - 07:33:09 | 3745 |
| Laughlin/Bullhead City | 07:18:11 | -75.6 | Dark | Down | 78.8 | 246.9 | Up | 07:03:11 - 07:33:11 | 3713 |
| Lake Havasu City | 07:18:10 | -76.3 | Dark | Down | 78.8 | 250.6 | Up | 07:03:10 - 07:33:10 | 3641 |
| George/Scottsdale | 07:18:00 | -77.7 | Dark | Down | 77.1 | 258.0 | Up | 07:03:00 - 07:33:00 | 3576 |
| Wildwood | 07:18:26 | -74.6 | Dark | Down | 82.2 | 242.0 | Up | 07:03:26 - 07:33:26 | 3571 |
| Idyllwild | 07:18:19 | -75.9 | Dark | Down | 80.9 | 249.6 | Up | 07:03:19 - 07:33:19 | 3541 |
| Calipatria | 07:18:14 | -76.9 | Dark | Down | 80.2 | 255.5 | Up | 07:03:14 - 07:33:14 | 3481 |
| Yuma | 07:18:10 | -77.7 | Dark | Down | 79.6 | 259.2 | Up | 07:03:10 - 07:33:10 | 3439 |
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, (2024/01/10 07:19UT) Object RA Dec mag sep mel Pollux 07:45:17.9 +28:01:33 1.1 21.02 160 Alnath 05:26:17.5 +28:36:23 1.6 9.51 169 44Kap Aur 06:15:22.6 +29:29:47 4.3 1.46 179 PPM 071326 06:11:19.5 +30:40:25 8.5 0.65 177 PPM 071300 06:10:11.4 +30:01:44 9.3 0.22 178 PPM 071274 06:09:13.2 +30:01:45 10.3 0.15 178 98WS31 06:09:23.7 +30:10:15 16.2 178 Positions are for J2000
Event circumstances last updated at 2023/11/06 05:18:05 UT
Marc W. Buie, Southwest Research Institute