Event between (181855) 98WT31 and star GA1360:03523547 with event index number of 1806774
Geocentric closest approach at 2027/12/26 13:15:23 UTC
J2000 position of star is 05:55:36.3 +46:02:28
Equinox of date position of star is 05:57:25.3 +46:02:35
Stellar brightness G=15.2,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 159 degrees from the moon.
Moon is 2% illuminated.
Apparent brightness V=23.5
[RECON map]
Object is 37.7 AU from the Sun
and 36.8 AU from the Earth.
Apparent velocity is 25.2
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 558 seconds.
The 1-sigma cross-track error in the shadow position is
5926 km.
The sky-plane scale is
26673.7 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, (2027/12/26 13:15UT) Object RA Dec mag sep mel Pollux 07:47:01.8 +27:57:23 1.1 28.10 147 34Bet Aur 06:01:35.0 +44:56:49 1.9 1.29 160 35Pi Aur 06:02:00.8 +45:56:09 5.9 0.76 159 PPM 048591 05:59:42.0 +45:54:08 7.2 0.38 159 PPM 048565 05:58:06.6 +45:59:16 9.7 0.09 159 181855 05:57:41.1 +46:02:36 15.2 159 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
1.6 sigma about the mid-time.
The median site spacing is 16.5 km
RECON observability=0.9 and success probability=7.0%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Sleaford | 13:12:53 | -16.9 | AT | Down | 30.5 | 307.2 | Up | 12:57:53 - 13:27:53 | -3952 |
| Dunrhomin | 13:12:16 | -12.8 | AT | Down | 22.6 | 312.0 | Low | 12:57:16 - 13:27:16 | -4434 |
| Nikitin | 13:12:16 | -12.8 | AT | Down | 22.5 | 312.1 | Low | 12:57:16 - 13:27:16 | -4444 |
| CU-SBO | 13:12:15 | -12.8 | AT | Down | 22.5 | 312.1 | Low | 12:57:15 - 13:27:15 | -4452 |
| Kelowna | 13:12:45 | -24.8 | Dark | Down | 36.3 | 300.9 | Up | 12:57:45 - 13:27:45 | -4738 |
| Kamloops | 13:12:48 | -25.5 | Dark | Down | 37.2 | 300.0 | Up | 12:57:48 - 13:27:48 | -4740 |
| Peachland | 13:12:44 | -25.0 | Dark | Down | 36.4 | 300.9 | Up | 12:57:44 - 13:27:44 | -4760 |
| Penticton | 13:12:43 | -24.9 | Dark | Down | 36.2 | 301.1 | Up | 12:57:43 - 13:27:43 | -4761 |
| Summerland | 13:12:44 | -24.9 | Dark | Down | 36.3 | 301.0 | Up | 12:57:44 - 13:27:44 | -4763 |
| Anarchist Mountain Observatory | 13:12:42 | -24.7 | Dark | Down | 35.8 | 301.5 | Up | 12:57:42 - 13:27:42 | -4780 |
| Oliver | 13:12:42 | -24.8 | Dark | Down | 36.0 | 301.3 | Up | 12:57:42 - 13:27:42 | -4781 |
| Okanogan | 13:12:40 | -24.7 | Dark | Down | 35.6 | 301.8 | Up | 12:57:40 - 13:27:40 | -4828 |
| Brewster | 13:12:39 | -24.8 | Dark | Down | 35.6 | 301.9 | Up | 12:57:39 - 13:27:39 | -4854 |
| Manson/Chelan | 13:12:38 | -25.0 | Dark | Down | 35.7 | 301.8 | Up | 12:57:38 - 13:27:38 | -4886 |
| Wenatchee | 13:12:37 | -25.1 | Dark | Down | 35.5 | 302.0 | Up | 12:57:37 - 13:27:37 | -4922 |
| PNWRO | 13:12:32 | -23.9 | Dark | Down | 34.0 | 303.5 | Up | 12:57:32 - 13:27:32 | -4925 |
| Ellensburg | 13:12:36 | -25.2 | Dark | Down | 35.4 | 302.2 | Up | 12:57:36 - 13:27:36 | -4958 |
| Yakima | 13:12:34 | -25.1 | Dark | Down | 35.2 | 302.4 | Up | 12:57:34 - 13:27:34 | -4983 |
| Toppenish/White Swan | 13:12:34 | -25.0 | Dark | Down | 35.0 | 302.6 | Up | 12:57:34 - 13:27:34 | -4987 |
| Victoria | 13:12:42 | -27.3 | Dark | Down | 37.9 | 299.8 | Up | 12:57:42 - 13:27:42 | -5022 |
| The Dalles | 13:12:31 | -25.4 | Dark | Down | 35.1 | 302.7 | Up | 12:57:31 - 13:27:31 | -5077 |
| Maupin | 13:12:31 | -25.3 | Dark | Down | 34.8 | 303.0 | Up | 12:57:31 - 13:27:31 | -5097 |
| Bend | 13:12:27 | -25.3 | Dark | Down | 34.3 | 303.5 | Up | 12:57:27 - 13:27:27 | -5178 |
| Sisters | 13:12:27 | -25.5 | Dark | Down | 34.6 | 303.3 | Up | 12:57:27 - 13:27:27 | -5179 |
| Oregon Observatory | 13:12:26 | -25.4 | Dark | Down | 34.3 | 303.6 | Up | 12:57:26 - 13:27:26 | -5197 |
| George/Scottsdale | 13:11:56 | -15.8 | AT | Down | 22.3 | 311.4 | Low | 12:56:56 - 13:26:56 | -5230 |
| Patrick | 13:12:01 | -17.9 | AT | Down | 24.6 | 310.2 | Low | 12:57:01 - 13:27:01 | -5257 |
| Cedarville | 13:12:19 | -24.1 | Dark | Down | 32.2 | 305.3 | Up | 12:57:19 - 13:27:19 | -5269 |
| Chiloquin | 13:12:22 | -25.5 | Dark | Down | 33.8 | 304.1 | Up | 12:57:22 - 13:27:22 | -5304 |
| Laughlin/Bullhead City | 13:12:00 | -18.4 | Dark | Down | 24.9 | 310.1 | Low | 12:57:00 - 13:27:00 | -5319 |
| Klamath Falls | 13:12:21 | -25.4 | Dark | Down | 33.6 | 304.3 | Up | 12:57:21 - 13:27:21 | -5321 |
| Lake Havasu City | 13:11:59 | -18.0 | Dark | Down | 24.3 | 310.4 | Low | 12:56:59 - 13:26:59 | -5345 |
| Beatty | 13:12:05 | -20.6 | Dark | Down | 27.4 | 308.7 | Low | 12:57:05 - 13:27:05 | -5351 |
| Hawthorne | 13:12:10 | -22.4 | Dark | Down | 29.5 | 307.3 | Low | 12:57:10 - 13:27:10 | -5366 |
| Yerington | 13:12:11 | -22.9 | Dark | Down | 30.1 | 306.9 | Up | 12:57:11 - 13:27:11 | -5369 |
| Fall River/Burney | 13:12:18 | -24.9 | Dark | Down | 32.7 | 305.1 | Up | 12:57:18 - 13:27:18 | -5374 |
| Reno | 13:12:13 | -23.5 | Dark | Down | 30.9 | 306.4 | Up | 12:57:13 - 13:27:13 | -5374 |
| Carson City | 13:12:12 | -23.4 | Dark | Down | 30.6 | 306.6 | Up | 12:57:12 - 13:27:12 | -5396 |
| Portola | 13:12:14 | -24.0 | Dark | Down | 31.4 | 306.1 | Up | 12:57:14 - 13:27:14 | -5397 |
| Gimple | 13:12:15 | -24.4 | Dark | Down | 31.9 | 305.8 | Up | 12:57:15 - 13:27:15 | -5400 |
| Greenville | 13:12:15 | -24.4 | Dark | Down | 31.9 | 305.7 | Up | 12:57:15 - 13:27:15 | -5405 |
| Gardnerville | 13:12:11 | -23.3 | Dark | Down | 30.5 | 306.8 | Up | 12:57:11 - 13:27:11 | -5409 |
| Quincy | 13:12:14 | -24.4 | Dark | Down | 31.8 | 305.8 | Up | 12:57:14 - 13:27:14 | -5418 |
| Bishop | 13:12:07 | -21.9 | Dark | Down | 28.7 | 307.9 | Low | 12:57:07 - 13:27:07 | -5426 |
| Lee Vining | 13:12:08 | -22.6 | Dark | Down | 29.5 | 307.4 | Low | 12:57:08 - 13:27:08 | -5433 |
| Yuma | 13:11:54 | -17.8 | AT | Down | 23.4 | 310.9 | Low | 12:56:54 - 13:26:54 | -5482 |
| Calipatria | 13:11:55 | -18.6 | Dark | Down | 24.2 | 310.5 | Low | 12:56:55 - 13:26:55 | -5514 |
| Idyllwild | 13:11:57 | -19.7 | Dark | Down | 25.3 | 309.9 | Low | 12:56:57 - 13:26:57 | -5553 |
| Wildwood | 13:11:58 | -21.3 | Dark | Down | 26.8 | 309.2 | Low | 12:56:58 - 13:26:58 | -5655 |
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, (2027/12/26 13:15UT) Object RA Dec mag sep mel Pollux 07:45:17.9 +28:01:33 1.1 28.10 147 34Bet Aur 05:59:31.6 +44:56:51 1.9 1.29 160 35Pi Aur 05:59:56.1 +45:56:12 5.9 0.76 159 PPM 048591 05:57:37.4 +45:54:04 7.2 0.38 159 PPM 048565 05:56:01.9 +45:59:09 9.7 0.09 159 181855 05:55:36.3 +46:02:28 15.2 159 Positions are for J2000
Event circumstances last updated at 2024/06/10 01:53:52 UT
Marc W. Buie, Southwest Research Institute