Event between 12UN177 and star GA1260:00603827 with event index number of 2307070
Geocentric closest approach at 2021/09/26 04:58:31 UTC
J2000 position of star is 02:47:51.6 +36:11:47
Equinox of date position of star is 02:49:12.6 +36:17:10
Stellar brightness G=11.4,
use SENSEUP=8 with the MallinCam and and exposure
time of 125 milli-seconds with the QHY174 camera.
Star is 22 degrees from the moon.
Moon is 76% illuminated.
TNO apparent brightness V=23.3
[RECON map]
TNO is 36.3 AU from the Sun
and 35.7 AU from the Earth.
The TNO is moving 17.0
km/sec on the sky relative to the star, or,
2.4 arcsec/hr.
The 1-sigma error in the time of the event is 466 seconds.
The 1-sigma cross-track error in the shadow position is
3983 km.
The sky-plane scale is
25882.7 km/arcsec.
The TNO has an absolute magnitude Hv=7.6
Diameter=186.2 km assuming a 5% albedo -- 11.0 sec chord
Diameter=76.0 km assuming a 30% albedo -- 4.5 sec chord
Dynamical classification is SCATEXTD
Star training set for 12UN177, (2021/09/26 04:59UT) Object RA Dec mag sep mel Aldebaran 04:37:10.2 +16:33:04 0.8 31.01 9 Algol 03:09:35.5 +41:02:16 2.1 6.19 23 17 Per 02:52:51.6 +35:08:53 5.8 1.36 21 PPM 067734 02:48:19.3 +36:04:25 7.2 0.28 22 PPM 067771 02:49:59.8 +36:17:58 9.0 0.16 22 12UN177 02:49:12.7 +36:17:10 11.4 22 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
1.9 sigma about the mid-time.
The median site spacing is 23.8 km
RECON observability=1.0 and success probability=7.6%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Victoria | 05:03:13 | -28.8 | Dark | Up | 29.7 | 67.6 | Low | 04:48:13 - 05:18:13 | 6586 |
| Clarence Fulton | 05:03:01 | -29.8 | Dark | Up | 32.8 | 71.1 | Up | 04:48:01 - 05:18:01 | 6554 |
| Peachland | 05:03:03 | -29.9 | Dark | Up | 32.3 | 70.5 | Up | 04:48:03 - 05:18:03 | 6533 |
| Kelowna | 05:03:02 | -30.0 | Dark | Up | 32.5 | 70.7 | Up | 04:48:02 - 05:18:02 | 6530 |
| Summerland | 05:03:04 | -30.1 | Dark | Up | 32.3 | 70.4 | Up | 04:48:04 - 05:18:04 | 6517 |
| Penticton | 05:03:04 | -30.2 | Dark | Up | 32.4 | 70.5 | Up | 04:48:04 - 05:18:04 | 6508 |
| Oliver | 05:03:06 | -30.4 | Dark | Up | 32.3 | 70.3 | Up | 04:48:06 - 05:18:06 | 6480 |
| Anarchist Mountain Observatory | 05:03:06 | -30.6 | Dark | Up | 32.3 | 70.3 | Up | 04:48:06 - 05:18:06 | 6459 |
| Tonasket | 05:03:08 | -30.8 | Dark | Up | 32.2 | 70.1 | Up | 04:48:08 - 05:18:08 | 6437 |
| Okanogan | 05:03:10 | -30.9 | Dark | Up | 32.0 | 69.8 | Up | 04:48:10 - 05:18:10 | 6416 |
| Brewster | 05:03:11 | -31.0 | Dark | Up | 31.8 | 69.5 | Up | 04:48:11 - 05:18:11 | 6402 |
| Manson/Chelan | 05:03:13 | -30.9 | Dark | Up | 31.5 | 69.2 | Up | 04:48:13 - 05:18:13 | 6401 |
| Wenatchee | 05:03:13 | -31.1 | Dark | Up | 31.2 | 68.8 | Up | 04:48:13 - 05:18:13 | 6370 |
| Ellensburg | 05:03:16 | -31.3 | Dark | Up | 30.9 | 68.4 | Up | 04:48:16 - 05:18:16 | 6346 |
| Yakima | 05:03:18 | -31.5 | Dark | Up | 30.7 | 68.2 | Up | 04:48:18 - 05:18:18 | 6314 |
| Toppenish/White Swan | 05:03:19 | -31.7 | Dark | Up | 30.8 | 68.2 | Up | 04:48:19 - 05:18:19 | 6289 |
| Goldendale | 05:03:21 | -31.8 | Dark | Up | 30.3 | 67.7 | Up | 04:48:21 - 05:18:21 | 6263 |
| The Dalles | 05:03:21 | -31.8 | Dark | Up | 30.0 | 67.3 | Low | 04:48:21 - 05:18:21 | 6261 |
| Pasco | 05:03:17 | -32.5 | Dark | Up | 31.5 | 68.9 | Up | 04:48:17 - 05:18:17 | 6225 |
| Maupin | 05:03:24 | -32.1 | Dark | Up | 29.9 | 67.2 | Low | 04:48:24 - 05:18:24 | 6222 |
| PNWRO | 05:03:17 | -32.8 | Dark | Up | 31.6 | 68.8 | Up | 04:48:17 - 05:18:17 | 6196 |
| Sisters | 05:03:28 | -32.3 | Dark | Up | 29.2 | 66.5 | Low | 04:48:28 - 05:18:28 | 6172 |
| Redmond | 05:03:27 | -32.6 | Dark | Up | 29.5 | 66.7 | Low | 04:48:27 - 05:18:27 | 6153 |
| Bend | 05:03:28 | -32.6 | Dark | Up | 29.3 | 66.5 | Low | 04:48:28 - 05:18:28 | 6141 |
| Oregon Observatory | 05:03:28 | -32.6 | Dark | Up | 29.2 | 66.3 | Low | 04:48:28 - 05:18:28 | 6133 |
| La Pine/Gilchrist | 05:03:31 | -32.7 | Dark | Up | 29.0 | 66.2 | Low | 04:48:31 - 05:18:31 | 6119 |
| North Lake | 05:03:31 | -33.3 | Dark | Up | 29.3 | 66.3 | Low | 04:48:31 - 05:18:31 | 6056 |
| Chiloquin | 05:03:34 | -33.2 | Dark | Up | 28.4 | 65.5 | Low | 04:48:34 - 05:18:34 | 6043 |
| Klamath Falls | 05:03:36 | -33.4 | Dark | Up | 28.3 | 65.3 | Low | 04:48:36 - 05:18:36 | 6011 |
| Paisley | 05:03:33 | -33.9 | Dark | Up | 29.3 | 66.2 | Low | 04:48:33 - 05:18:33 | 5994 |
| Lakeview | 05:03:34 | -34.3 | Dark | Up | 29.2 | 66.0 | Low | 04:48:34 - 05:18:34 | 5942 |
| Fall River/Burney | 05:03:40 | -34.3 | Dark | Up | 28.0 | 65.0 | Low | 04:48:40 - 05:18:40 | 5895 |
| Cedarville | 05:03:37 | -34.8 | Dark | Up | 29.1 | 65.8 | Low | 04:48:37 - 05:18:37 | 5879 |
| Susanville | 05:03:41 | -35.1 | Dark | Up | 28.3 | 65.0 | Low | 04:48:41 - 05:18:41 | 5807 |
| Greenville | 05:03:42 | -35.1 | Dark | Up | 28.0 | 64.7 | Low | 04:48:42 - 05:18:42 | 5797 |
| Gimple | 05:03:42 | -35.2 | Dark | Up | 28.0 | 64.8 | Low | 04:48:42 - 05:18:42 | 5793 |
| Quincy | 05:03:43 | -35.2 | Dark | Up | 27.9 | 64.6 | Low | 04:48:43 - 05:18:43 | 5780 |
| Portola | 05:03:43 | -35.6 | Dark | Up | 28.2 | 64.8 | Low | 04:48:43 - 05:18:43 | 5747 |
| Reno | 05:03:43 | -36.2 | Dark | Up | 28.5 | 65.0 | Low | 04:48:43 - 05:18:43 | 5693 |
| Carson City | 05:03:44 | -36.4 | Dark | Up | 28.4 | 64.8 | Low | 04:48:44 - 05:18:44 | 5661 |
| Gardnerville | 05:03:45 | -36.6 | Dark | Up | 28.3 | 64.7 | Low | 04:48:45 - 05:18:45 | 5638 |
| Yerington | 05:03:44 | -36.9 | Dark | Up | 28.7 | 65.0 | Low | 04:48:44 - 05:18:44 | 5614 |
| Hawthorne | 05:03:45 | -37.5 | Dark | Up | 28.9 | 65.0 | Low | 04:48:45 - 05:18:45 | 5548 |
| Lee Vining | 05:03:47 | -37.5 | Dark | Up | 28.3 | 64.5 | Low | 04:48:47 - 05:18:47 | 5522 |
| Tonopah | 05:03:44 | -38.7 | Dark | Up | 29.7 | 65.4 | Low | 04:48:44 - 05:18:44 | 5440 |
| Bishop | 05:03:48 | -38.3 | Dark | Up | 28.6 | 64.5 | Low | 04:48:48 - 05:18:48 | 5435 |
| CPSLO | 05:03:57 | -37.9 | Dark | Up | 26.1 | 62.7 | Low | 04:48:57 - 05:18:57 | 5365 |
| Beatty | 05:03:46 | -39.7 | Dark | Up | 29.6 | 65.0 | Low | 04:48:46 - 05:18:46 | 5315 |
| Indian Springs | 05:03:46 | -40.6 | Dark | Up | 30.2 | 65.2 | Up | 04:48:46 - 05:18:46 | 5234 |
| Wildwood | 05:03:57 | -40.0 | Dark | Up | 27.0 | 62.9 | Low | 04:48:57 - 05:18:57 | 5154 |
| Henderson | 05:03:46 | -41.3 | Dark | Up | 30.5 | 65.2 | Up | 04:48:46 - 05:18:46 | 5152 |
| Dunrhomin | 05:03:13 | -43.9 | Dark | Up | 39.1 | 72.0 | Up | 04:48:13 - 05:18:13 | 5114 |
| Laughlin/Bullhead City | 05:03:48 | -42.1 | Dark | Up | 30.5 | 64.9 | Up | 04:48:48 - 05:18:48 | 5053 |
| Patrick | 05:03:46 | -42.4 | Dark | Up | 31.1 | 65.3 | Up | 04:48:46 - 05:18:46 | 5042 |
| Kingman/Dolan Springs | 05:03:47 | -42.4 | Dark | Up | 30.8 | 65.1 | Up | 04:48:47 - 05:18:47 | 5031 |
| Mohave Valley | 05:03:49 | -42.3 | Dark | Up | 30.3 | 64.8 | Up | 04:48:49 - 05:18:49 | 5028 |
| Idyllwild | 05:03:56 | -41.5 | Dark | Up | 28.3 | 63.4 | Low | 04:48:56 - 05:18:56 | 5027 |
| Lake Havasu City | 05:03:50 | -42.7 | Dark | Up | 30.4 | 64.7 | Up | 04:48:50 - 05:18:50 | 4979 |
| Parker | 05:03:50 | -42.9 | Dark | Up | 30.2 | 64.5 | Up | 04:48:50 - 05:18:50 | 4945 |
| Calipatria | 05:03:55 | -42.7 | Dark | Up | 28.9 | 63.6 | Low | 04:48:55 - 05:18:55 | 4912 |
| Blythe | 05:03:52 | -43.0 | Dark | Up | 29.8 | 64.1 | Low | 04:48:52 - 05:18:52 | 4912 |
| Yuma | 05:03:56 | -43.6 | Dark | Up | 29.4 | 63.6 | Low | 04:48:56 - 05:18:56 | 4828 |
| George/Scottsdale | 05:03:46 | -44.8 | Dark | Up | 31.9 | 65.1 | Up | 04:48:46 - 05:18:46 | 4789 |
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 12UN177, (2021/09/26 04:59UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:29 0.8 31.01 9 Algol 03:08:10.1 +40:57:20 2.1 6.19 23 17 Per 02:51:30.9 +35:03:34 5.8 1.36 21 PPM 067734 02:46:58.4 +35:59:01 7.2 0.28 22 PPM 067771 02:48:38.6 +36:12:36 9.0 0.16 22 12UN177 02:47:51.6 +36:11:47 11.4 22 Positions are for J2000
Event circumstances last updated at 2021/09/15 01:42:50 UT
Marc W. Buie, Southwest Research Institute