Event between (50000) Quaoar and star GA0740:22827920 with event index number of 2326912
Geocentric closest approach at 2025/05/21 07:31:27 UTC
J2000 position of star is 18:43:59.4 -14:53:35
Equinox of date position of star is 18:45:22.2 -14:52:01
Stellar brightness G=15.7,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 61 degrees from the moon.
Moon is 41% illuminated.
Apparent brightness V=18.8
[RECON map]
Object is 42.6 AU from the Sun
and 41.9 AU from the Earth.
Apparent velocity is 17.7
km/sec on the sky relative to the star, or,
2.1 arcsec/hr.
The 1-sigma error in the time of the event is 137 seconds.
The 1-sigma cross-track error in the shadow position is
1597 km.
The sky-plane scale is
30375.1 km/arcsec.
The object has an absolute magnitude Hv=2.4
Diameter=1905.5 km assuming a 5% albedo -- 111.4 sec chord
Diameter=777.9 km assuming a 30% albedo -- 45.5 sec chord
Dynamical classification is CLASSICAL
Star training set for 50000, (2025/05/21 07:31UT) Object RA Dec mag sep mel Antares 16:30:58.1 -26:29:10 0.9 33.40 91 Nunki 18:56:50.2 -26:15:46 2.0 11.70 58 PPM 235105 18:51:57.2 -13:32:27 6.5 2.06 59 PPM 234947 18:45:12.7 -15:14:47 8.4 0.38 61 PPM 234935 18:44:39.1 -14:39:21 9.2 0.28 61 50000 18:45:26.3 -14:51:56 15.7 60 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
5.0 sigma about the mid-time.
The median site spacing is 16.1 km
RECON observability=0.3 and success probability=16.8%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Sleaford | 07:33:56 | -17.3 | AT | Down | 16.8 | 145.4 | Really Low | 07:22:01 - 07:45:52 | 98 |
| Kamloops | 07:34:41 | -18.9 | Dark | Down | 12.0 | 132.3 | Really Low | 07:22:46 - 07:46:37 | -204 |
| Kelowna | 07:34:42 | -19.7 | Dark | Down | 12.9 | 132.9 | Really Low | 07:22:46 - 07:46:37 | -236 |
| Peachland | 07:34:43 | -19.8 | Dark | Down | 12.9 | 132.7 | Really Low | 07:22:47 - 07:46:38 | -248 |
| Summerland | 07:34:43 | -20.0 | Dark | Down | 13.0 | 132.7 | Really Low | 07:22:48 - 07:46:39 | -255 |
| Penticton | 07:34:43 | -20.1 | Dark | Down | 13.1 | 132.8 | Really Low | 07:22:47 - 07:46:38 | -257 |
| Oliver | 07:34:44 | -20.4 | Dark | Down | 13.3 | 132.8 | Really Low | 07:22:49 - 07:46:40 | -278 |
| Anarchist Mountain Observatory | 07:34:44 | -20.6 | Dark | Down | 13.6 | 132.9 | Really Low | 07:22:49 - 07:46:40 | -285 |
| Okanogan | 07:34:47 | -21.2 | Dark | Down | 13.9 | 132.6 | Really Low | 07:22:51 - 07:46:42 | -328 |
| Brewster | 07:34:48 | -21.5 | Dark | Down | 14.0 | 132.4 | Really Low | 07:22:53 - 07:46:44 | -349 |
| Manson/Chelan | 07:34:50 | -21.7 | Dark | Down | 13.9 | 132.0 | Really Low | 07:22:54 - 07:46:45 | -368 |
| Victoria | 07:34:56 | -20.8 | Dark | Down | 11.9 | 129.4 | Really Low | 07:23:01 - 07:46:52 | -387 |
| Wenatchee | 07:34:52 | -22.1 | Dark | Down | 14.2 | 131.8 | Really Low | 07:22:57 - 07:46:48 | -401 |
| Ellensburg | 07:34:54 | -22.5 | Dark | Down | 14.3 | 131.5 | Really Low | 07:22:59 - 07:46:50 | -431 |
| Yakima | 07:34:55 | -22.9 | Dark | Down | 14.6 | 131.5 | Really Low | 07:23:00 - 07:46:51 | -457 |
| PNWRO | 07:34:52 | -23.6 | Dark | Down | 15.9 | 132.7 | Really Low | 07:22:57 - 07:46:48 | -465 |
| Toppenish/White Swan | 07:34:56 | -23.2 | Dark | Down | 14.8 | 131.6 | Really Low | 07:23:00 - 07:46:51 | -468 |
| The Dalles | 07:35:00 | -23.9 | Dark | Down | 14.9 | 130.7 | Really Low | 07:23:05 - 07:46:56 | -534 |
| Maupin | 07:35:01 | -24.3 | Dark | Down | 15.3 | 130.8 | Really Low | 07:23:06 - 07:46:57 | -560 |
| Dunrhomin | 07:34:20 | -28.9 | Dark | Down | 26.7 | 143.5 | Low | 07:22:25 - 07:46:16 | -604 |
| Nikitin | 07:34:21 | -29.1 | Dark | Down | 26.9 | 143.4 | Low | 07:22:25 - 07:46:16 | -617 |
| CU-SBO | 07:34:21 | -29.1 | Dark | Down | 26.9 | 143.3 | Low | 07:22:26 - 07:46:17 | -623 |
| Sisters | 07:35:05 | -25.1 | Dark | Down | 15.6 | 130.2 | Really Low | 07:23:10 - 07:47:01 | -628 |
| Bend | 07:35:05 | -25.4 | Dark | Down | 15.9 | 130.3 | Really Low | 07:23:10 - 07:47:01 | -639 |
| Oregon Observatory | 07:35:06 | -25.6 | Dark | Down | 15.9 | 130.2 | Really Low | 07:23:11 - 07:47:02 | -653 |
| Chiloquin | 07:35:11 | -26.8 | Dark | Down | 16.6 | 129.6 | Really Low | 07:23:16 - 07:47:07 | -753 |
| Klamath Falls | 07:35:12 | -27.2 | Dark | Down | 16.8 | 129.6 | Really Low | 07:23:17 - 07:47:08 | -776 |
| Cedarville | 07:35:09 | -28.0 | Dark | Down | 18.2 | 130.7 | Really Low | 07:23:14 - 07:47:05 | -794 |
| Fall River/Burney | 07:35:14 | -28.4 | Dark | Down | 17.8 | 129.6 | Really Low | 07:23:19 - 07:47:10 | -853 |
| Gimple | 07:35:15 | -29.3 | Dark | Down | 18.7 | 129.8 | Really Low | 07:23:20 - 07:47:11 | -909 |
| Greenville | 07:35:15 | -29.3 | Dark | Down | 18.6 | 129.7 | Really Low | 07:23:20 - 07:47:11 | -910 |
| Portola | 07:35:15 | -29.7 | Dark | Down | 19.1 | 130.0 | Really Low | 07:23:19 - 07:47:10 | -925 |
| Quincy | 07:35:16 | -29.5 | Dark | Down | 18.8 | 129.7 | Really Low | 07:23:20 - 07:47:11 | -925 |
| Reno | 07:35:13 | -30.0 | Dark | Down | 19.7 | 130.5 | Really Low | 07:23:18 - 07:47:09 | -931 |
| Carson City | 07:35:14 | -30.4 | Dark | Down | 19.9 | 130.4 | Really Low | 07:23:19 - 07:47:10 | -957 |
| Yerington | 07:35:13 | -30.6 | Dark | Down | 20.4 | 130.9 | Low | 07:23:18 - 07:47:09 | -959 |
| Gardnerville | 07:35:15 | -30.6 | Dark | Down | 20.1 | 130.4 | Low | 07:23:19 - 07:47:10 | -975 |
| Hawthorne | 07:35:13 | -31.1 | Dark | Down | 21.0 | 131.2 | Low | 07:23:17 - 07:47:08 | -983 |
| Lee Vining | 07:35:16 | -31.6 | Dark | Down | 21.1 | 130.6 | Low | 07:23:20 - 07:47:11 | -1035 |
| Bishop | 07:35:15 | -32.3 | Dark | Down | 22.0 | 131.0 | Low | 07:23:19 - 07:47:10 | -1066 |
| Beatty | 07:35:10 | -32.8 | Dark | Down | 23.2 | 132.2 | Low | 07:23:15 - 07:47:06 | -1068 |
| Patrick | 07:35:03 | -34.3 | Dark | Down | 25.9 | 134.1 | Low | 07:23:08 - 07:46:59 | -1124 |
| Laughlin/Bullhead City | 07:35:06 | -34.6 | Dark | Down | 25.7 | 133.5 | Low | 07:23:11 - 07:47:02 | -1158 |
| Lake Havasu City | 07:35:07 | -35.2 | Dark | Down | 26.3 | 133.4 | Low | 07:23:11 - 07:47:02 | -1206 |
| George/Scottsdale | 07:34:59 | -36.0 | Dark | Down | 28.3 | 135.2 | Low | 07:23:04 - 07:46:55 | -1217 |
| Idyllwild | 07:35:17 | -36.0 | Dark | Down | 25.4 | 131.2 | Low | 07:23:21 - 07:47:12 | -1317 |
| Wildwood | 07:35:22 | -35.5 | Dark | Down | 24.0 | 129.8 | Low | 07:23:27 - 07:47:18 | -1329 |
| Calipatria | 07:35:14 | -36.6 | Dark | Down | 26.5 | 132.0 | Low | 07:23:18 - 07:47:09 | -1342 |
| Yuma | 07:35:11 | -37.1 | Dark | Down | 27.4 | 132.5 | Low | 07:23:16 - 07:47:07 | -1358 |
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 50000, (2025/05/21 07:31UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 33.40 91 Nunki 18:55:15.9 -26:17:49 2.0 11.70 58 PPM 235105 18:50:31.2 -13:34:20 6.5 2.06 59 PPM 234947 18:43:45.6 -15:16:26 8.4 0.38 61 PPM 234935 18:43:12.4 -14:40:58 9.2 0.28 61 50000 18:43:59.4 -14:53:35 15.7 61 Positions are for J2000
Event circumstances last updated at 2024/03/02 06:15:44 UT
Marc W. Buie, Southwest Research Institute