Event between (500838) 13GV137 and star GA0740:05292173 with event index number of 1155105
Geocentric closest approach at 2021/04/16 10:44:57 UTC
J2000 position of star is 14:52:18.3 -15:02:50
Equinox of date position of star is 14:53:28.2 -15:07:57
Stellar brightness G=16.5,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 151 degrees from the moon.
Moon is 16% illuminated.
TNO apparent brightness V=23.5
[RECON map]
TNO is 46.2 AU from the Sun
and 45.3 AU from the Earth.
The TNO is moving 23.7
km/sec on the sky relative to the star, or,
2.6 arcsec/hr.
The 1-sigma error in the time of the event is 368 seconds.
The 1-sigma cross-track error in the shadow position is
3779 km.
The sky-plane scale is
32838.9 km/arcsec.
The TNO has an absolute magnitude Hv=6.8
Diameter=263.0 km assuming a 5% albedo -- 11.1 sec chord
Diameter=107.4 km assuming a 30% albedo -- 4.5 sec chord
Dynamical classification is CLASSICAL
Star training set for 500838, (2021/04/16 10:45UT) Object RA Dec mag sep mel Spica 13:26:19.1 -11:16:18 1.0 21.55 130 27Bet Lib 15:18:09.3 -09:27:37 2.6 8.27 154 8Alp1Lib 14:51:52.1 -16:05:04 5.1 1.03 151 PPM 229407 14:53:00.2 -15:19:06 7.6 0.22 151 500838 14:53:29.0 -15:08:01 16.5 152 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
2.4 sigma about the mid-time.
The median site spacing is 13.4 km
RECON observability=1.0 and success probability=0.7%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Clarence Fulton | 10:44:59 | -19.3 | Dark | Down | 21.5 | 204.6 | Low | 10:29:59 - 10:59:59 | 11630 |
| Kelowna | 10:45:00 | -19.6 | Dark | Down | 21.9 | 204.5 | Low | 10:30:00 - 11:00:00 | 11614 |
| Peachland | 10:44:59 | -19.9 | Dark | Down | 22.0 | 204.2 | Low | 10:29:59 - 10:59:59 | 11606 |
| Summerland | 10:44:59 | -19.9 | Dark | Down | 22.2 | 204.4 | Low | 10:29:59 - 10:59:59 | 11602 |
| Penticton | 10:44:58 | -19.9 | Dark | Down | 22.2 | 204.5 | Low | 10:29:58 - 10:59:58 | 11601 |
| Oliver | 10:44:57 | -20.2 | Dark | Down | 22.5 | 204.5 | Low | 10:29:57 - 10:59:57 | 11587 |
| Anarchist Mountain Observatory | 10:44:57 | -20.2 | Dark | Down | 22.6 | 204.8 | Low | 10:29:57 - 10:59:57 | 11584 |
| Tonasket | 10:44:56 | -20.5 | Dark | Down | 22.9 | 204.7 | Low | 10:29:56 - 10:59:56 | 11570 |
| Okanogan | 10:44:57 | -20.8 | Dark | Down | 23.3 | 204.7 | Low | 10:29:57 - 10:59:57 | 11555 |
| Brewster | 10:44:56 | -21.1 | Dark | Down | 23.6 | 204.5 | Low | 10:29:56 - 10:59:56 | 11541 |
| Manson/Chelan | 10:44:56 | -21.4 | Dark | Down | 23.9 | 204.2 | Low | 10:29:56 - 10:59:56 | 11528 |
| Victoria | 10:45:09 | -22.4 | Dark | Down | 24.1 | 200.8 | Low | 10:30:09 - 11:00:09 | 11511 |
| Wenatchee | 10:44:57 | -21.8 | Dark | Down | 24.3 | 204.1 | Low | 10:29:57 - 10:59:57 | 11507 |
| Ellensburg | 10:44:57 | -22.2 | Dark | Down | 24.8 | 203.9 | Low | 10:29:57 - 10:59:57 | 11487 |
| Pasco | 10:44:51 | -22.1 | Dark | Down | 25.0 | 205.5 | Low | 10:29:51 - 10:59:51 | 11473 |
| Yakima | 10:44:57 | -22.5 | Dark | Down | 25.1 | 204.0 | Low | 10:29:57 - 10:59:57 | 11469 |
| PNWRO | 10:44:50 | -22.1 | Dark | Down | 25.2 | 205.8 | Low | 10:29:50 - 10:59:50 | 11465 |
| Toppenish/White Swan | 10:44:55 | -22.6 | Dark | Down | 25.3 | 204.2 | Low | 10:29:55 - 10:59:55 | 11462 |
| Goldendale | 10:44:55 | -23.2 | Dark | Down | 25.9 | 203.9 | Low | 10:29:55 - 10:59:55 | 11432 |
| The Dalles | 10:44:56 | -23.5 | Dark | Down | 26.2 | 203.5 | Low | 10:29:56 - 10:59:56 | 11416 |
| Maupin | 10:44:54 | -23.8 | Dark | Down | 26.6 | 203.7 | Low | 10:29:54 - 10:59:54 | 11399 |
| Redmond | 10:44:54 | -24.5 | Dark | Down | 27.4 | 203.8 | Low | 10:29:54 - 10:59:54 | 11356 |
| Sisters | 10:44:56 | -24.6 | Dark | Down | 27.5 | 203.4 | Low | 10:29:56 - 10:59:56 | 11352 |
| Bend | 10:44:53 | -24.7 | Dark | Down | 27.7 | 203.7 | Low | 10:29:53 - 10:59:53 | 11344 |
| Oregon Observatory | 10:44:53 | -24.9 | Dark | Down | 27.9 | 203.6 | Low | 10:29:53 - 10:59:53 | 11334 |
| Dunrhomin | 10:43:56 | -17.8 | AT | Down | 24.6 | 220.3 | Low | 10:28:56 - 10:58:56 | 11328 |
| La Pine/Gilchrist | 10:44:53 | -25.1 | Dark | Down | 28.1 | 203.6 | Low | 10:29:53 - 10:59:53 | 11323 |
| North Lake | 10:44:50 | -25.1 | Dark | Down | 28.3 | 204.3 | Low | 10:29:50 - 10:59:50 | 11311 |
| Paisley | 10:44:48 | -25.3 | Dark | Down | 28.7 | 204.8 | Low | 10:29:48 - 10:59:48 | 11289 |
| Lakeview | 10:44:48 | -25.5 | Dark | Down | 29.1 | 205.1 | Low | 10:29:48 - 10:59:48 | 11266 |
| Klamath Falls | 10:44:50 | -26.3 | Dark | Down | 29.5 | 203.6 | Low | 10:29:50 - 10:59:50 | 11247 |
| Cedarville | 10:44:47 | -25.9 | Dark | Down | 29.6 | 205.4 | Low | 10:29:47 - 10:59:47 | 11235 |
| Fall River/Burney | 10:44:48 | -26.9 | Dark | Down | 30.5 | 204.3 | Up | 10:29:48 - 10:59:48 | 11191 |
| Susanville | 10:44:44 | -26.9 | Dark | Down | 30.8 | 205.2 | Up | 10:29:44 - 10:59:44 | 11169 |
| Gimple | 10:44:45 | -27.3 | Dark | Down | 31.1 | 205.1 | Up | 10:29:45 - 10:59:45 | 11151 |
| Greenville | 10:44:45 | -27.3 | Dark | Down | 31.2 | 205.0 | Up | 10:29:45 - 10:59:45 | 11149 |
| Portola | 10:44:42 | -27.3 | Dark | Down | 31.3 | 205.5 | Up | 10:29:42 - 10:59:42 | 11139 |
| Quincy | 10:44:45 | -27.4 | Dark | Down | 31.3 | 205.0 | Up | 10:29:45 - 10:59:45 | 11138 |
| Reno | 10:44:42 | -27.1 | Dark | Down | 31.3 | 206.3 | Up | 10:29:42 - 10:59:42 | 11134 |
| Carson City | 10:44:40 | -27.3 | Dark | Down | 31.6 | 206.4 | Up | 10:29:40 - 10:59:40 | 11114 |
| Yerington | 10:44:37 | -27.1 | Dark | Down | 31.6 | 207.1 | Up | 10:29:37 - 10:59:37 | 11113 |
| Gardnerville | 10:44:38 | -27.5 | Dark | Down | 31.8 | 206.5 | Up | 10:29:38 - 10:59:38 | 11102 |
| Hawthorne | 10:44:35 | -27.1 | Dark | Down | 31.8 | 207.8 | Up | 10:29:35 - 10:59:35 | 11094 |
| Tonopah | 10:44:28 | -26.6 | Dark | Down | 31.7 | 209.4 | Up | 10:29:28 - 10:59:28 | 11088 |
| Lee Vining | 10:44:35 | -27.8 | Dark | Down | 32.5 | 207.5 | Up | 10:29:35 - 10:59:35 | 11056 |
| Bishop | 10:44:31 | -27.7 | Dark | Down | 32.8 | 208.4 | Up | 10:29:31 - 10:59:31 | 11031 |
| Beatty | 10:44:24 | -27.1 | Dark | Down | 32.5 | 210.2 | Up | 10:29:24 - 10:59:24 | 11026 |
| Indian Springs | 10:44:21 | -26.6 | Dark | Down | 32.4 | 211.4 | Up | 10:29:21 - 10:59:21 | 11021 |
| Henderson | 10:44:19 | -26.5 | Dark | Down | 32.5 | 212.3 | Up | 10:29:19 - 10:59:19 | 10998 |
| Patrick | 10:44:12 | -26.2 | Dark | Down | 32.6 | 213.6 | Up | 10:29:12 - 10:59:12 | 10974 |
| Kingman/Dolan Springs | 10:44:12 | -26.4 | Dark | Down | 32.9 | 213.5 | Up | 10:29:12 - 10:59:12 | 10958 |
| Laughlin/Bullhead City | 10:44:16 | -26.8 | Dark | Down | 33.1 | 213.0 | Up | 10:29:16 - 10:59:16 | 10950 |
| Mohave Valley | 10:44:14 | -26.9 | Dark | Down | 33.3 | 213.1 | Up | 10:29:14 - 10:59:14 | 10933 |
| Lake Havasu City | 10:44:12 | -27.0 | Dark | Down | 33.6 | 213.5 | Up | 10:29:12 - 10:59:12 | 10912 |
| George/Scottsdale | 10:44:02 | -25.8 | Dark | Down | 33.0 | 216.3 | Up | 10:29:02 - 10:59:02 | 10893 |
| Parker | 10:44:12 | -27.2 | Dark | Down | 33.8 | 213.7 | Up | 10:29:12 - 10:59:12 | 10890 |
| CPSLO | 10:44:35 | -30.5 | Dark | Down | 35.4 | 206.6 | Up | 10:29:35 - 10:59:35 | 10872 |
| Blythe | 10:44:11 | -27.7 | Dark | Down | 34.4 | 213.6 | Up | 10:29:11 - 10:59:11 | 10853 |
| Idyllwild | 10:44:18 | -29.0 | Dark | Down | 35.2 | 211.3 | Up | 10:29:18 - 10:59:18 | 10833 |
| Wildwood | 10:44:27 | -30.0 | Dark | Down | 35.7 | 209.2 | Up | 10:29:27 - 10:59:27 | 10828 |
| Calipatria | 10:44:13 | -28.6 | Dark | Down | 35.2 | 212.8 | Up | 10:29:13 - 10:59:13 | 10809 |
| Yuma | 10:44:09 | -28.3 | Dark | Down | 35.2 | 213.9 | Up | 10:29:09 - 10:59:09 | 10793 |
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 500838, (2021/04/16 10:45UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 21.55 130 27Bet Lib 15:17:00.3 -09:22:59 2.6 8.27 154 8Alp1Lib 14:50:41.1 -15:59:52 5.1 1.03 151 PPM 229407 14:51:49.5 -15:13:55 7.6 0.22 151 500838 14:52:18.3 -15:02:50 16.5 151 Positions are for J2000
Event circumstances last updated at 2021/01/20 20:31:28 UT
Marc W. Buie, Southwest Research Institute