Event between (385199) 99OE4 and star GA0840:20035412 with event index number of 2414462
Geocentric closest approach at 2026/09/23 02:57:42 UTC
J2000 position of star is 23:29:13.3 -04:52:23
Equinox of date position of star is 23:30:21.4 -04:45:05
Stellar brightness G=11.1,
use SENSEUP=8 with the MallinCam and and exposure
time of 125 milli-seconds with the QHY174 camera.
Star is 34 degrees from the moon.
Moon is 87% illuminated.
TNO apparent brightness V=22.6
[RECON map]
TNO is 43.3 AU from the Sun
and 42.3 AU from the Earth.
The TNO is moving 24.6
km/sec on the sky relative to the star, or,
2.9 arcsec/hr.
The 1-sigma error in the time of the event is 301 seconds.
The 1-sigma cross-track error in the shadow position is
5271 km.
The sky-plane scale is
30655.4 km/arcsec.
The TNO has an absolute magnitude Hv=6.3
Diameter=323.6 km assuming a 5% albedo -- 13.1 sec chord
Diameter=132.1 km assuming a 30% albedo -- 5.4 sec chord
Dynamical classification is CLASSICAL
Star training set for 385199, (2026/09/23 02:58UT) Object RA Dec mag sep mel Fomalhaut 22:59:07.2 -29:28:47 1.2 25.85 26 Markab 23:06:05.6 +15:20:59 2.5 20.97 41 PPM 207611 23:30:54.9 -04:23:12 6.3 0.35 34 PPM 207618 23:31:06.1 -04:35:52 9.6 0.18 34 385199 23:30:35.9 -04:43:32 11.1 34 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
3.0 sigma about the mid-time.
The median site spacing is 26.8 km
RECON observability=0.2 and success probability=0.5%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Kamloops | 02:58:42 | -10.2 | NT | Up | 11.0 | 112.0 | Really Low | 02:43:42 - 03:13:42 | 11923 |
| Kelowna | 02:58:42 | -11.0 | NT | Up | 11.8 | 112.5 | Really Low | 02:43:42 - 03:13:42 | 11892 |
| Peachland | 02:58:45 | -10.8 | NT | Up | 11.7 | 112.3 | Really Low | 02:43:45 - 03:13:45 | 11890 |
| Summerland | 02:58:45 | -10.9 | NT | Up | 11.8 | 112.3 | Really Low | 02:43:45 - 03:13:45 | 11884 |
| Penticton | 02:58:44 | -11.0 | NT | Up | 11.9 | 112.4 | Really Low | 02:43:44 - 03:13:44 | 11881 |
| Victoria | 02:58:53 | -8.7 | NT | Up | 9.9 | 109.2 | Really Low | 02:43:53 - 03:13:53 | 11870 |
| Oliver | 02:58:47 | -11.1 | NT | Up | 12.1 | 112.4 | Really Low | 02:43:47 - 03:13:47 | 11870 |
| Anarchist Mountain Observatory | 02:58:46 | -11.2 | NT | Up | 12.2 | 112.5 | Really Low | 02:43:46 - 03:13:46 | 11863 |
| Tonasket | 02:58:46 | -11.2 | NT | Up | 12.3 | 112.4 | Really Low | 02:43:46 - 03:13:46 | 11852 |
| Okanogan | 02:58:48 | -11.2 | NT | Up | 12.4 | 112.2 | Really Low | 02:43:48 - 03:13:48 | 11842 |
| Brewster | 02:58:50 | -11.2 | NT | Up | 12.3 | 112.0 | Really Low | 02:43:50 - 03:13:50 | 11833 |
| Sleaford | 02:58:17 | -18.2 | Dark | Up | 18.2 | 124.6 | Really Low | 02:43:17 - 03:13:17 | 11830 |
| Manson/Chelan | 02:58:52 | -11.0 | NT | Up | 12.2 | 111.6 | Really Low | 02:43:52 - 03:13:52 | 11828 |
| Wenatchee | 02:58:54 | -11.0 | NT | Up | 12.3 | 111.4 | Really Low | 02:43:54 - 03:13:54 | 11812 |
| Ellensburg | 02:58:54 | -10.9 | NT | Up | 12.3 | 111.2 | Really Low | 02:43:54 - 03:13:54 | 11798 |
| Yakima | 02:58:58 | -11.0 | NT | Up | 12.4 | 111.1 | Really Low | 02:43:58 - 03:13:58 | 11783 |
| Toppenish/White Swan | 02:58:58 | -11.1 | NT | Up | 12.6 | 111.2 | Really Low | 02:43:58 - 03:13:58 | 11773 |
| Goldendale | 02:59:00 | -11.0 | NT | Up | 12.5 | 110.7 | Really Low | 02:44:00 - 03:14:00 | 11755 |
| PNWRO | 02:58:58 | -12.2 | AT | Up | 13.7 | 112.2 | Really Low | 02:43:58 - 03:13:58 | 11748 |
| The Dalles | 02:59:02 | -10.8 | NT | Up | 12.4 | 110.4 | Really Low | 02:44:02 - 03:14:02 | 11748 |
| Maupin | 02:59:03 | -10.9 | NT | Up | 12.6 | 110.4 | Really Low | 02:44:03 - 03:14:03 | 11730 |
| Sisters | 02:59:06 | -10.8 | NT | Up | 12.6 | 109.8 | Really Low | 02:44:06 - 03:14:06 | 11698 |
| Bend | 02:59:07 | -11.0 | NT | Up | 12.8 | 110.0 | Really Low | 02:44:07 - 03:14:07 | 11686 |
| Oregon Observatory | 02:59:09 | -10.9 | NT | Up | 12.8 | 109.9 | Really Low | 02:44:09 - 03:14:09 | 11679 |
| North Lake | 02:59:11 | -11.4 | NT | Up | 13.4 | 110.1 | Really Low | 02:44:11 - 03:14:11 | 11648 |
| Chiloquin | 02:59:14 | -10.9 | NT | Up | 13.0 | 109.3 | Really Low | 02:44:14 - 03:14:14 | 11624 |
| Klamath Falls | 02:59:15 | -11.0 | NT | Up | 13.2 | 109.3 | Really Low | 02:44:15 - 03:14:15 | 11608 |
| Lakeview | 02:59:15 | -12.1 | AT | Up | 14.2 | 110.3 | Really Low | 02:44:15 - 03:14:15 | 11596 |
| Cedarville | 02:59:17 | -12.3 | AT | Up | 14.5 | 110.3 | Really Low | 02:44:17 - 03:14:17 | 11564 |
| Fall River/Burney | 02:59:19 | -11.5 | NT | Up | 13.8 | 109.3 | Really Low | 02:44:19 - 03:14:19 | 11549 |
| Susanville | 02:59:22 | -12.2 | AT | Up | 14.6 | 109.7 | Really Low | 02:44:22 - 03:14:22 | 11513 |
| Greenville | 02:59:24 | -12.0 | AT | Up | 14.5 | 109.4 | Really Low | 02:44:24 - 03:14:24 | 11502 |
| Gimple | 02:59:22 | -12.1 | AT | Up | 14.5 | 109.5 | Really Low | 02:44:22 - 03:14:22 | 11501 |
| Quincy | 02:59:24 | -12.1 | AT | Up | 14.5 | 109.4 | Really Low | 02:44:24 - 03:14:24 | 11492 |
| Portola | 02:59:23 | -12.4 | AT | Up | 14.9 | 109.7 | Really Low | 02:44:23 - 03:14:23 | 11482 |
| Reno | 02:59:22 | -13.0 | AT | Up | 15.5 | 110.1 | Really Low | 02:44:22 - 03:14:22 | 11463 |
| Carson City | 02:59:25 | -13.1 | AT | Up | 15.6 | 110.0 | Really Low | 02:44:25 - 03:14:25 | 11445 |
| Gardnerville | 02:59:24 | -13.2 | AT | Up | 15.7 | 110.0 | Really Low | 02:44:24 - 03:14:24 | 11432 |
| Yerington | 02:59:24 | -13.6 | AT | Up | 16.2 | 110.4 | Really Low | 02:44:24 - 03:14:24 | 11430 |
| Hawthorne | 02:59:26 | -14.1 | AT | Up | 16.7 | 110.6 | Really Low | 02:44:26 - 03:14:26 | 11401 |
| Lee Vining | 02:59:28 | -13.8 | AT | Up | 16.6 | 110.1 | Really Low | 02:44:28 - 03:14:28 | 11376 |
| Tonopah | 02:59:26 | -15.3 | AT | Up | 17.9 | 111.5 | Really Low | 02:44:26 - 03:14:26 | 11363 |
| Bishop | 02:59:29 | -14.5 | AT | Up | 17.3 | 110.5 | Really Low | 02:44:29 - 03:14:29 | 11336 |
| Dunrhomin | 02:58:56 | -23.5 | Dark | Up | 25.2 | 121.5 | Low | 02:43:56 - 03:13:56 | 11323 |
| Beatty | 02:59:29 | -15.9 | AT | Up | 18.7 | 111.5 | Really Low | 02:44:29 - 03:14:29 | 11295 |
| Indian Springs | 02:59:28 | -16.8 | AT | Up | 19.6 | 112.1 | Really Low | 02:44:28 - 03:14:28 | 11265 |
| Henderson | 02:59:29 | -17.5 | AT | Up | 20.3 | 112.4 | Low | 02:44:29 - 03:14:29 | 11226 |
| Patrick | 02:59:29 | -18.5 | Dark | Up | 21.4 | 113.0 | Low | 02:44:29 - 03:14:29 | 11177 |
| Laughlin/Bullhead City | 02:59:31 | -18.0 | Dark | Up | 21.0 | 112.4 | Low | 02:44:31 - 03:14:31 | 11170 |
| Kingman/Dolan Springs | 02:59:29 | -18.4 | Dark | Up | 21.4 | 112.8 | Low | 02:44:29 - 03:14:29 | 11166 |
| Mohave Valley | 02:59:32 | -18.1 | Dark | Up | 21.1 | 112.3 | Low | 02:44:32 - 03:14:32 | 11154 |
| Wildwood | 02:59:42 | -15.0 | AT | Up | 18.3 | 109.4 | Really Low | 02:44:42 - 03:14:42 | 11150 |
| Lake Havasu City | 02:59:33 | -18.4 | Dark | Up | 21.4 | 112.4 | Low | 02:44:33 - 03:14:33 | 11127 |
| Idyllwild | 02:59:39 | -16.6 | AT | Up | 19.9 | 110.5 | Really Low | 02:44:39 - 03:14:39 | 11110 |
| Parker | 02:59:34 | -18.5 | Dark | Up | 21.6 | 112.3 | Low | 02:44:34 - 03:14:34 | 11106 |
| Calipatria | 02:59:40 | -17.7 | AT | Up | 21.0 | 111.1 | Low | 02:44:40 - 03:14:40 | 11058 |
| George/Scottsdale | 02:59:31 | -20.5 | Dark | Up | 23.6 | 113.8 | Low | 02:44:31 - 03:14:31 | 11049 |
| Yuma | 02:59:40 | -18.5 | Dark | Up | 21.9 | 111.5 | Low | 02:44:40 - 03:14:40 | 11020 |
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 385199, (2026/09/23 02:58UT) Object RA Dec mag sep mel Fomalhaut 22:57:39.6 -29:37:24 1.2 25.85 26 Markab 23:04:45.8 +15:12:18 2.5 20.97 41 PPM 207611 23:29:32.4 -04:32:03 6.3 0.35 34 PPM 207618 23:29:43.6 -04:44:43 9.6 0.18 34 385199 23:29:13.3 -04:52:23 11.1 34 Positions are for J2000
Event circumstances last updated at 2022/01/17 00:10:41 UT
Marc W. Buie, Southwest Research Institute