Event between (69990) 98WU31 and star UC4-550-019478 with event index number of 178060
Geocentric closest approach at 2019/01/30 06:48:01 UTC
J2000 position of star is 05:48:21.3 +19:55:24
Equinox of date position of star is 05:49:25.1 +19:55:42
Stellar brightness R=16.5,
use SENSEUP=128
Star is 161 degrees from the moon.
Moon is 26% illuminated.
TNO apparent brightness V=23.9
[RECON map]
TNO is 35.6 AU from the Sun
and 34.8 AU from the Earth.
The TNO is moving 17.3
km/sec on the sky relative to the star, or,
2.5 arcsec/hr.
The 1-sigma error in the time of the event is 2882 seconds.
The 1-sigma cross-track error in the shadow position is
5809 km.
The sky-plane scale is
25263.8 km/arcsec.
The TNO has an absolute magnitude Hv=8.3
Diameter=131.8 km assuming a 5% albedo -- 7.6 sec chord
Diameter=53.8 km assuming a 30% albedo -- 3.1 sec chord
Dynamical classification is 3:2E
Star training set for 69990, (2019/01/30 06:48UT) Object RA Dec mag sep mel Betelgeuse 05:56:12.3 +07:24:33 0.4 12.62 157 Alnath 05:27:30.0 +28:37:19 1.6 10.03 163 PPM 121513 05:53:31.3 +19:52:16 6.4 0.95 160 PPM 121502 05:52:59.8 +19:31:29 7.1 0.92 160 PPM 121423 05:49:58.3 +19:55:49 8.8 0.11 161 69990 05:49:29.2 +19:55:43 16.5 161 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
0.3 sigma about the mid-time.
The median site spacing is 23.6 km
RECON observability=1.0 and success probability=7.5%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Oroville | 06:46:27 | -54.4 | Dark | Down | 55.1 | 222.5 | Up | 06:31:27 - 07:01:27 | 1249 |
| Tonasket | 06:46:26 | -54.6 | Dark | Down | 55.2 | 222.7 | Up | 06:31:26 - 07:01:26 | 1227 |
| Okanogan | 06:46:26 | -54.8 | Dark | Down | 55.5 | 222.9 | Up | 06:31:26 - 07:01:26 | 1194 |
| Brewster | 06:46:26 | -54.9 | Dark | Down | 55.8 | 222.8 | Up | 06:31:26 - 07:01:26 | 1166 |
| Manson/Chelan | 06:46:27 | -55.0 | Dark | Down | 56.2 | 222.5 | Up | 06:31:27 - 07:01:27 | 1142 |
| Entiat | 06:46:27 | -55.1 | Dark | Down | 56.4 | 222.6 | Up | 06:31:27 - 07:01:27 | 1120 |
| Wenatchee | 06:46:27 | -55.3 | Dark | Down | 56.6 | 222.7 | Up | 06:31:27 - 07:01:27 | 1094 |
| Ellensburg | 06:46:27 | -55.5 | Dark | Down | 57.0 | 222.8 | Up | 06:31:27 - 07:01:27 | 1052 |
| Yakima | 06:46:26 | -55.8 | Dark | Down | 57.3 | 223.2 | Up | 06:31:26 - 07:01:26 | 1013 |
| Pasco | 06:46:20 | -56.7 | Dark | Down | 56.9 | 225.7 | Up | 06:31:20 - 07:01:20 | 998 |
| Toppenish/White Swan | 06:46:25 | -56.0 | Dark | Down | 57.4 | 223.7 | Up | 06:31:25 - 07:01:25 | 994 |
| PNWRO | 06:46:19 | -57.0 | Dark | Down | 56.9 | 226.3 | Up | 06:31:19 - 07:01:19 | 976 |
| George/Umatilla | 06:46:20 | -56.8 | Dark | Down | 57.2 | 225.7 | Up | 06:31:20 - 07:01:20 | 962 |
| Goldendale | 06:46:26 | -56.3 | Dark | Down | 58.0 | 223.7 | Up | 06:31:26 - 07:01:26 | 935 |
| The Dalles | 06:46:27 | -56.3 | Dark | Down | 58.3 | 223.4 | Up | 06:31:27 - 07:01:27 | 909 |
| Maupin | 06:46:26 | -56.6 | Dark | Down | 58.6 | 224.0 | Up | 06:31:26 - 07:01:26 | 870 |
| Madras/Culver | 06:46:25 | -57.0 | Dark | Down | 59.0 | 224.6 | Up | 06:31:25 - 07:01:25 | 815 |
| Redmond | 06:46:25 | -57.2 | Dark | Down | 59.3 | 224.9 | Up | 06:31:25 - 07:01:25 | 780 |
| Sisters | 06:46:26 | -57.0 | Dark | Down | 59.4 | 224.3 | Up | 06:31:26 - 07:01:26 | 777 |
| Bend | 06:46:25 | -57.3 | Dark | Down | 59.5 | 224.9 | Up | 06:31:25 - 07:01:25 | 757 |
| Oregon Observatory | 06:46:25 | -57.4 | Dark | Down | 59.7 | 224.9 | Up | 06:31:25 - 07:01:25 | 738 |
| La Pine/Gilchrist | 06:46:25 | -57.5 | Dark | Down | 59.9 | 225.1 | Up | 06:31:25 - 07:01:25 | 717 |
| North Lake | 06:46:22 | -58.1 | Dark | Down | 59.8 | 226.5 | Up | 06:31:22 - 07:01:22 | 681 |
| Paisley | 06:46:19 | -58.7 | Dark | Down | 60.0 | 227.8 | Up | 06:31:19 - 07:01:19 | 631 |
| Niwot | 06:45:11 | -66.8 | Dark | Down | 51.6 | 249.7 | Up | 06:30:11 - 07:00:11 | 618 |
| Chiloquin | 06:46:25 | -58.1 | Dark | Down | 60.8 | 225.9 | Up | 06:31:25 - 07:01:25 | 602 |
| Lakeview | 06:46:17 | -59.1 | Dark | Down | 60.3 | 228.7 | Up | 06:31:17 - 07:01:17 | 582 |
| Klamath Falls | 06:46:24 | -58.4 | Dark | Down | 61.0 | 226.5 | Up | 06:31:24 - 07:01:24 | 569 |
| Tulelake | 06:46:22 | -58.7 | Dark | Down | 61.0 | 227.3 | Up | 06:31:22 - 07:01:22 | 545 |
| Cedarville | 06:46:15 | -59.7 | Dark | Down | 60.6 | 229.9 | Up | 06:31:15 - 07:01:15 | 519 |
| Fall River/Burney | 06:46:20 | -59.4 | Dark | Down | 61.6 | 228.7 | Up | 06:31:20 - 07:01:20 | 454 |
| Susanville | 06:46:15 | -60.2 | Dark | Down | 61.6 | 230.7 | Up | 06:31:15 - 07:01:15 | 400 |
| Gimple | 06:46:16 | -60.3 | Dark | Down | 61.9 | 230.8 | Up | 06:31:16 - 07:01:16 | 369 |
| Greenville | 06:46:16 | -60.2 | Dark | Down | 61.9 | 230.6 | Up | 06:31:16 - 07:01:16 | 368 |
| Quincy | 06:46:16 | -60.4 | Dark | Down | 62.1 | 230.9 | Up | 06:31:16 - 07:01:16 | 347 |
| Portola | 06:46:14 | -60.7 | Dark | Down | 61.9 | 231.8 | Up | 06:31:14 - 07:01:14 | 341 |
| Reno | 06:46:10 | -61.3 | Dark | Down | 61.6 | 233.2 | Up | 06:31:10 - 07:01:10 | 322 |
| Carson City | 06:46:10 | -61.5 | Dark | Down | 61.8 | 233.7 | Up | 06:31:10 - 07:01:10 | 286 |
| Yerington | 06:46:07 | -62.0 | Dark | Down | 61.6 | 235.0 | Up | 06:31:07 - 07:01:07 | 275 |
| Gardnerville | 06:46:09 | -61.7 | Dark | Down | 62.0 | 234.2 | Up | 06:31:09 - 07:01:09 | 261 |
| Hawthorne | 06:46:03 | -62.6 | Dark | Down | 61.5 | 236.4 | Up | 06:31:03 - 07:01:03 | 234 |
| Tonopah | 06:45:56 | -63.7 | Dark | Down | 60.8 | 239.0 | Up | 06:30:56 - 07:00:56 | 207 |
| Lee Vining | 06:46:04 | -62.7 | Dark | Down | 62.1 | 236.6 | Up | 06:31:04 - 07:01:04 | 169 |
| Bishop | 06:46:00 | -63.5 | Dark | Down | 62.0 | 238.5 | Up | 06:31:00 - 07:01:00 | 118 |
| Beatty | 06:45:52 | -64.8 | Dark | Down | 61.1 | 241.4 | Up | 06:30:52 - 07:00:52 | 95 |
| Indian Springs | 06:45:46 | -65.6 | Dark | Down | 60.5 | 243.3 | Up | 06:30:46 - 07:00:46 | 77 |
| Lone Pine | 06:45:57 | -64.2 | Dark | Down | 62.1 | 240.2 | Up | 06:30:57 - 07:00:57 | 44 |
| Henderson | 06:45:42 | -66.4 | Dark | Down | 60.2 | 244.9 | Up | 06:30:42 - 07:00:42 | 33 |
| Patrick | 06:45:36 | -67.4 | Dark | Down | 59.7 | 247.2 | Up | 06:30:36 - 07:00:36 | -13 |
| Searchlight/Boulder City | 06:45:41 | -66.8 | Dark | Down | 60.4 | 245.9 | Up | 06:30:41 - 07:00:41 | -25 |
| DCO | 06:45:32 | -68.1 | Dark | Down | 59.3 | 248.4 | Up | 06:30:32 - 07:00:32 | -33 |
| Kingman/Dolan Springs | 06:45:37 | -67.5 | Dark | Down | 59.9 | 247.3 | Up | 06:30:37 - 07:00:37 | -39 |
| Laughlin/Bullhead City | 06:45:39 | -67.2 | Dark | Down | 60.3 | 246.8 | Up | 06:30:39 - 07:00:39 | -50 |
| Mohave Valley | 06:45:39 | -67.4 | Dark | Down | 60.4 | 247.2 | Up | 06:30:39 - 07:00:39 | -78 |
| Lake Havasu City | 06:45:37 | -67.9 | Dark | Down | 60.4 | 248.2 | Up | 06:30:37 - 07:00:37 | -116 |
| CPSLO | 06:46:08 | -63.4 | Dark | Down | 64.6 | 238.9 | Up | 06:31:08 - 07:01:08 | -128 |
| Parker | 06:45:36 | -68.1 | Dark | Down | 60.5 | 248.8 | Up | 06:30:36 - 07:00:36 | -152 |
| Blythe | 06:45:36 | -68.3 | Dark | Down | 60.9 | 249.3 | Up | 06:30:36 - 07:00:36 | -212 |
| Wildwood | 06:45:56 | -65.5 | Dark | Down | 63.7 | 243.8 | Up | 06:30:56 - 07:00:56 | -225 |
| Idyllwild | 06:45:46 | -66.9 | Dark | Down | 62.5 | 246.8 | Up | 06:30:46 - 07:00:46 | -234 |
| Calipatria | 06:45:40 | -68.1 | Dark | Down | 61.8 | 249.2 | Up | 06:30:40 - 07:00:40 | -279 |
| Yuma | 06:45:35 | -68.9 | Dark | Down | 61.2 | 250.9 | Up | 06:30:35 - 07:00:35 | -310 |
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 69990, (2019/01/30 06:48UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 12.62 157 Alnath 05:26:17.5 +28:36:24 1.6 10.03 163 PPM 121513 05:52:23.4 +19:52:04 6.4 0.95 160 PPM 121502 05:51:52.1 +19:31:17 7.1 0.92 160 PPM 121423 05:48:50.4 +19:55:32 8.8 0.11 161 69990 05:48:21.3 +19:55:24 16.5 161 Positions are for J2000
Event circumstances last updated at 2017/12/05 19:12:40 UT
Marc W. Buie, Southwest Research Institute