Event between (181855) 98WT31 and star GA1320:02649907 with event index number of 1211430
Geocentric closest approach at 2023/04/01 04:39:00 UTC
J2000 position of star is 05:07:35.0 +42:02:43
Equinox of date position of star is 05:09:12.8 +42:04:26
Stellar brightness G=15.6,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 56 degrees from the moon.
Moon is 78% illuminated.
Apparent brightness V=23.6
[RECON map]
Object is 37.6 AU from the Sun
and 37.9 AU from the Earth.
Apparent velocity is 16.8
km/sec on the sky relative to the star, or,
2.2 arcsec/hr.
The 1-sigma error in the time of the event is 283 seconds.
The 1-sigma cross-track error in the shadow position is
3432 km.
The sky-plane scale is
27507.2 km/arcsec.
The object has an absolute magnitude Hv=7.7
Diameter=173.8 km assuming a 5% albedo -- 10.3 sec chord
Diameter=70.9 km assuming a 30% albedo -- 4.2 sec chord
Dynamical classification is SCATEXTD
Star training set for 181855, (2023/04/01 04:29UT) Object RA Dec mag sep mel Aldebaran 04:37:15.4 +16:33:15 0.8 26.42 66 3Iot Aur 04:58:30.7 +33:12:03 2.7 9.12 58 10Eta Aur 05:08:09.0 +41:15:49 3.2 0.84 56 PPM 047736 05:08:57.2 +42:07:28 8.0 0.07 55 PPM 047743 05:09:28.6 +42:02:23 9.3 0.06 55 181855 05:09:13.8 +42:04:27 15.6 55 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
3.2 sigma about the mid-time.
The median site spacing is 12.0 km
RECON observability=1.0 and success probability=5.7%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Sleaford | 04:41:27 | -25.5 | Dark | Up | 39.2 | 291.0 | Up | 04:26:27 - 04:56:27 | 6980 |
| Dunrhomin | 04:42:35 | -34.7 | Dark | Up | 33.5 | 299.5 | Up | 04:27:35 - 04:57:35 | 6580 |
| Nikitin | 04:42:35 | -34.8 | Dark | Up | 33.4 | 299.6 | Up | 04:27:35 - 04:57:35 | 6571 |
| CU-SBO | 04:42:34 | -34.8 | Dark | Up | 33.4 | 299.6 | Up | 04:27:34 - 04:57:34 | 6563 |
| Kelowna | 04:41:33 | -20.7 | Dark | Up | 46.6 | 284.9 | Up | 04:26:33 - 04:56:33 | 6218 |
| Kamloops | 04:41:28 | -19.7 | Dark | Up | 47.4 | 283.5 | Up | 04:26:28 - 04:56:28 | 6211 |
| Penticton | 04:41:35 | -20.8 | Dark | Up | 46.6 | 285.2 | Up | 04:26:35 - 04:56:35 | 6198 |
| Peachland | 04:41:33 | -20.6 | Dark | Up | 46.8 | 284.9 | Up | 04:26:33 - 04:56:33 | 6198 |
| Summerland | 04:41:35 | -20.7 | Dark | Up | 46.7 | 285.1 | Up | 04:26:35 - 04:56:35 | 6195 |
| Anarchist Mountain Observatory | 04:41:37 | -21.2 | Dark | Up | 46.3 | 285.9 | Up | 04:26:37 - 04:56:37 | 6183 |
| Oliver | 04:41:37 | -21.0 | Dark | Up | 46.5 | 285.6 | Up | 04:26:37 - 04:56:37 | 6181 |
| Okanogan | 04:41:42 | -21.5 | Dark | Up | 46.3 | 286.4 | Up | 04:26:42 - 04:56:42 | 6140 |
| Brewster | 04:41:43 | -21.6 | Dark | Up | 46.3 | 286.6 | Up | 04:26:43 - 04:56:43 | 6116 |
| Manson/Chelan | 04:41:44 | -21.5 | Dark | Up | 46.5 | 286.6 | Up | 04:26:44 - 04:56:44 | 6086 |
| PNWRO | 04:41:55 | -23.3 | Dark | Up | 45.1 | 289.1 | Up | 04:26:55 - 04:56:55 | 6060 |
| Wenatchee | 04:41:46 | -21.6 | Dark | Up | 46.5 | 287.0 | Up | 04:26:46 - 04:56:46 | 6052 |
| Ellensburg | 04:41:48 | -21.7 | Dark | Up | 46.5 | 287.3 | Up | 04:26:48 - 04:56:48 | 6019 |
| Yakima | 04:41:51 | -22.0 | Dark | Up | 46.4 | 287.7 | Up | 04:26:51 - 04:56:51 | 5997 |
| Toppenish/White Swan | 04:41:53 | -22.2 | Dark | Up | 46.2 | 288.0 | Up | 04:26:53 - 04:56:53 | 5995 |
| Victoria | 04:41:36 | -19.3 | Dark | Up | 48.8 | 284.1 | Up | 04:26:36 - 04:56:36 | 5944 |
| The Dalles | 04:41:55 | -22.2 | Dark | Up | 46.5 | 288.4 | Up | 04:26:55 - 04:56:55 | 5910 |
| Maupin | 04:41:59 | -22.4 | Dark | Up | 46.2 | 288.8 | Up | 04:26:59 - 04:56:59 | 5894 |
| George/Scottsdale | 04:43:07 | -34.9 | Dark | Up | 34.7 | 301.1 | Up | 04:28:07 - 04:58:07 | 5836 |
| Bend | 04:42:04 | -22.9 | Dark | Up | 46.0 | 289.8 | Up | 04:27:04 - 04:57:04 | 5820 |
| Sisters | 04:42:02 | -22.6 | Dark | Up | 46.3 | 289.5 | Up | 04:27:02 - 04:57:02 | 5818 |
| Oregon Observatory | 04:42:05 | -22.9 | Dark | Up | 46.0 | 290.0 | Up | 04:27:05 - 04:57:05 | 5803 |
| Patrick | 04:42:57 | -32.6 | Dark | Up | 37.0 | 299.5 | Up | 04:27:57 - 04:57:57 | 5800 |
| Cedarville | 04:42:18 | -25.0 | Dark | Up | 44.3 | 292.7 | Up | 04:27:18 - 04:57:18 | 5748 |
| Laughlin/Bullhead City | 04:42:56 | -32.2 | Dark | Up | 37.4 | 299.5 | Up | 04:27:56 - 04:57:56 | 5740 |
| Lake Havasu City | 04:43:02 | -32.8 | Dark | Up | 36.9 | 300.0 | Up | 04:28:02 - 04:58:02 | 5718 |
| Chiloquin | 04:42:11 | -23.4 | Dark | Up | 45.8 | 291.1 | Up | 04:27:11 - 04:57:11 | 5705 |
| Beatty | 04:42:46 | -29.8 | Dark | Up | 39.8 | 297.7 | Up | 04:27:46 - 04:57:46 | 5698 |
| Klamath Falls | 04:42:13 | -23.6 | Dark | Up | 45.7 | 291.4 | Up | 04:27:13 - 04:57:13 | 5691 |
| Hawthorne | 04:42:35 | -27.6 | Dark | Up | 41.9 | 295.8 | Up | 04:27:35 - 04:57:35 | 5672 |
| Yerington | 04:42:34 | -27.0 | Dark | Up | 42.5 | 295.3 | Up | 04:27:34 - 04:57:34 | 5666 |
| Reno | 04:42:32 | -26.3 | Dark | Up | 43.2 | 294.6 | Up | 04:27:32 - 04:57:32 | 5657 |
| Fall River/Burney | 04:42:20 | -24.5 | Dark | Up | 44.9 | 292.7 | Up | 04:27:20 - 04:57:20 | 5646 |
| Carson City | 04:42:33 | -26.5 | Dark | Up | 43.0 | 294.9 | Up | 04:27:33 - 04:57:33 | 5638 |
| Portola | 04:42:28 | -25.7 | Dark | Up | 43.8 | 294.1 | Up | 04:27:28 - 04:57:28 | 5632 |
| Gardnerville | 04:42:34 | -26.7 | Dark | Up | 42.9 | 295.1 | Up | 04:27:34 - 04:57:34 | 5626 |
| Gimple | 04:42:25 | -25.3 | Dark | Up | 44.2 | 293.7 | Up | 04:27:25 - 04:57:25 | 5626 |
| Greenville | 04:42:26 | -25.2 | Dark | Up | 44.2 | 293.7 | Up | 04:27:26 - 04:57:26 | 5621 |
| Bishop | 04:42:43 | -28.4 | Dark | Up | 41.2 | 296.8 | Up | 04:27:43 - 04:57:43 | 5620 |
| Quincy | 04:42:26 | -25.3 | Dark | Up | 44.2 | 293.9 | Up | 04:27:26 - 04:57:26 | 5610 |
| Lee Vining | 04:42:39 | -27.6 | Dark | Up | 42.0 | 296.1 | Up | 04:27:39 - 04:57:39 | 5609 |
| Yuma | 04:43:09 | -33.6 | Dark | Up | 36.2 | 301.1 | Up | 04:28:09 - 04:58:09 | 5593 |
| Calipatria | 04:43:06 | -32.7 | Dark | Up | 37.0 | 300.6 | Up | 04:28:06 - 04:58:06 | 5559 |
| Idyllwild | 04:43:02 | -31.5 | Dark | Up | 38.2 | 299.9 | Up | 04:28:02 - 04:58:02 | 5517 |
| Wildwood | 04:43:00 | -30.0 | Dark | Up | 39.8 | 299.3 | Up | 04:28:00 - 04:58:00 | 5412 |
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, (2023/04/01 04:29UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:29 0.8 26.42 66 3Iot Aur 04:56:59.6 +33:09:58 2.7 9.12 58 10Eta Aur 05:06:30.9 +41:14:03 3.2 0.84 56 PPM 047736 05:07:18.4 +42:05:44 8.0 0.07 55 PPM 047743 05:07:49.9 +42:00:40 9.3 0.06 55 181855 05:07:35.0 +42:02:43 15.6 55 Positions are for J2000
Event circumstances last updated at 2023/01/08 03:31:51 UT
Marc W. Buie, Southwest Research Institute