Event between (500834) 13GK137 and star UC4-371-068595 with event index number of 220547
Geocentric closest approach at 2018/02/04 12:00:44 UTC
J2000 position of star is 14:48:39.0 -15:55:02
Equinox of date position of star is 14:49:38.7 -15:59:28
Stellar brightness R=16.1,
use SENSEUP=128
Star is 37 degrees from the moon.
Moon is 80% illuminated.
TNO apparent brightness V=24.0
[RECON map]
TNO is 45.9 AU from the Sun
and 45.9 AU from the Earth.
The TNO is moving 3.8
km/sec on the sky relative to the star, or,
0.4 arcsec/hr.
The 1-sigma error in the time of the event is 652 seconds.
The 1-sigma cross-track error in the shadow position is
2658 km.
The sky-plane scale is
33256.8 km/arcsec.
The TNO has an absolute magnitude Hv=7.2
Diameter=218.8 km assuming a 5% albedo -- 57.2 sec chord
Diameter=89.3 km assuming a 30% albedo -- 23.4 sec chord
Dynamical classification is 3:2E
Star training set for 500834, (2018/02/04 12:01UT) Object RA Dec mag sep mel Spica 13:26:08.9 -11:15:19 1.0 20.82 17 27Bet Lib 15:17:59.0 -09:26:55 2.6 9.51 41 8Alp1Lib 14:51:41.4 -16:04:17 5.1 0.50 37 PPM 229351 14:51:06.6 -15:36:00 7.2 0.53 37 PPM 229349 14:51:03.1 -16:10:33 9.1 0.38 37 500834 14:49:39.3 -15:59:31 16.1 37 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
1.4 sigma about the mid-time.
The median site spacing is 10.2 km
RECON observability=0.9 and success probability=2.2%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Niwot | 11:43:58 | -27.5 | Dark | Up | 31.8 | 161.0 | Up | 11:28:58 - 11:58:58 | 7371 |
| Oroville | 11:40:27 | -36.6 | Dark | Up | 19.2 | 147.4 | Really Low | 11:25:27 - 11:55:27 | 7356 |
| Tonasket | 11:40:17 | -36.7 | Dark | Up | 19.4 | 147.4 | Really Low | 11:25:17 - 11:55:17 | 7340 |
| Okanogan | 11:40:13 | -36.9 | Dark | Up | 19.6 | 147.1 | Really Low | 11:25:13 - 11:55:13 | 7313 |
| Brewster | 11:40:00 | -37.2 | Dark | Up | 19.8 | 146.8 | Really Low | 11:25:00 - 11:55:00 | 7287 |
| Manson/Chelan | 11:39:58 | -37.5 | Dark | Up | 19.8 | 146.4 | Really Low | 11:24:58 - 11:54:58 | 7258 |
| Entiat | 11:40:02 | -37.6 | Dark | Up | 20.0 | 146.3 | Really Low | 11:25:02 - 11:55:02 | 7241 |
| Wenatchee | 11:39:56 | -37.8 | Dark | Up | 20.1 | 146.2 | Low | 11:24:56 - 11:54:56 | 7219 |
| Pasco | 11:40:06 | -37.3 | Dark | Up | 21.6 | 147.1 | Low | 11:25:06 - 11:55:06 | 7188 |
| Ellensburg | 11:39:45 | -38.1 | Dark | Up | 20.4 | 145.8 | Low | 11:24:45 - 11:54:45 | 7182 |
| PNWRO | 11:40:07 | -37.2 | Dark | Up | 21.9 | 147.3 | Low | 11:25:07 - 11:55:07 | 7181 |
| George/Umatilla | 11:40:00 | -37.6 | Dark | Up | 21.8 | 146.8 | Low | 11:25:00 - 11:55:00 | 7156 |
| Yakima | 11:39:45 | -38.2 | Dark | Up | 20.7 | 145.7 | Low | 11:24:45 - 11:54:45 | 7154 |
| Toppenish/White Swan | 11:39:49 | -38.1 | Dark | Up | 21.0 | 145.9 | Low | 11:24:49 - 11:54:49 | 7146 |
| Goldendale | 11:39:42 | -38.6 | Dark | Up | 21.2 | 145.3 | Low | 11:24:42 - 11:54:42 | 7090 |
| The Dalles | 11:39:38 | -38.9 | Dark | Up | 21.3 | 144.9 | Low | 11:24:38 - 11:54:38 | 7059 |
| Maupin | 11:39:32 | -39.0 | Dark | Up | 21.7 | 144.9 | Low | 11:24:32 - 11:54:32 | 7034 |
| Madras/Culver | 11:39:29 | -39.2 | Dark | Up | 22.1 | 144.7 | Low | 11:24:29 - 11:54:29 | 6993 |
| Redmond | 11:39:27 | -39.4 | Dark | Up | 22.3 | 144.6 | Low | 11:24:27 - 11:54:27 | 6965 |
| Sisters | 11:39:19 | -39.7 | Dark | Up | 22.1 | 144.2 | Low | 11:24:19 - 11:54:19 | 6950 |
| Bend | 11:39:23 | -39.5 | Dark | Up | 22.5 | 144.4 | Low | 11:24:23 - 11:54:23 | 6943 |
| Oregon Observatory | 11:39:21 | -39.7 | Dark | Up | 22.5 | 144.2 | Low | 11:24:21 - 11:54:21 | 6925 |
| La Pine/Gilchrist | 11:39:19 | -39.8 | Dark | Up | 22.7 | 144.1 | Low | 11:24:19 - 11:54:19 | 6908 |
| North Lake | 11:39:26 | -39.5 | Dark | Up | 23.3 | 144.6 | Low | 11:24:26 - 11:54:26 | 6902 |
| Paisley | 11:39:24 | -39.4 | Dark | Up | 23.9 | 144.8 | Low | 11:24:24 - 11:54:24 | 6877 |
| Lakeview | 11:39:33 | -39.4 | Dark | Up | 24.4 | 144.9 | Low | 11:24:33 - 11:54:33 | 6847 |
| Chiloquin | 11:39:10 | -40.4 | Dark | Up | 23.4 | 143.4 | Low | 11:24:10 - 11:54:10 | 6811 |
| Cedarville | 11:39:34 | -39.4 | Dark | Up | 25.0 | 144.8 | Low | 11:24:34 - 11:54:34 | 6806 |
| Klamath Falls | 11:39:06 | -40.4 | Dark | Up | 23.7 | 143.4 | Low | 11:24:06 - 11:54:06 | 6789 |
| Tulelake | 11:39:10 | -40.3 | Dark | Up | 24.1 | 143.6 | Low | 11:24:10 - 11:54:10 | 6781 |
| Fall River/Burney | 11:39:14 | -40.5 | Dark | Up | 24.8 | 143.5 | Low | 11:24:14 - 11:54:14 | 6716 |
| Susanville | 11:39:17 | -40.1 | Dark | Up | 25.7 | 144.0 | Low | 11:24:17 - 11:54:17 | 6701 |
| Tonopah | 11:40:12 | -37.7 | Dark | Up | 29.2 | 146.9 | Low | 11:25:12 - 11:55:12 | 6679 |
| Reno | 11:39:30 | -39.6 | Dark | Up | 26.8 | 144.6 | Low | 11:24:30 - 11:54:30 | 6673 |
| Gimple | 11:39:16 | -40.3 | Dark | Up | 25.8 | 143.7 | Low | 11:24:16 - 11:54:16 | 6671 |
| Greenville | 11:39:16 | -40.3 | Dark | Up | 25.8 | 143.7 | Low | 11:24:16 - 11:54:16 | 6667 |
| Portola | 11:39:24 | -40.0 | Dark | Up | 26.3 | 144.0 | Low | 11:24:24 - 11:54:24 | 6664 |
| Yerington | 11:39:38 | -39.2 | Dark | Up | 27.5 | 145.1 | Low | 11:24:38 - 11:54:38 | 6660 |
| Quincy | 11:39:16 | -40.4 | Dark | Up | 25.9 | 143.6 | Low | 11:24:16 - 11:54:16 | 6652 |
| Hawthorne | 11:39:52 | -38.8 | Dark | Up | 28.2 | 145.5 | Low | 11:24:52 - 11:54:52 | 6649 |
| DCO | 11:41:31 | -34.6 | Dark | Up | 33.6 | 150.4 | Up | 11:26:31 - 11:56:31 | 6647 |
| Carson City | 11:39:37 | -39.6 | Dark | Up | 27.1 | 144.6 | Low | 11:24:37 - 11:54:37 | 6646 |
| Indian Springs | 11:40:28 | -36.7 | Dark | Up | 31.2 | 148.0 | Up | 11:25:28 - 11:55:28 | 6638 |
| Patrick | 11:41:10 | -35.2 | Dark | Up | 33.0 | 149.7 | Up | 11:26:10 - 11:56:10 | 6636 |
| Henderson | 11:40:55 | -36.1 | Dark | Up | 32.0 | 148.6 | Up | 11:25:55 - 11:55:55 | 6630 |
| Gardnerville | 11:39:33 | -39.7 | Dark | Up | 27.3 | 144.5 | Low | 11:24:33 - 11:54:33 | 6630 |
| Beatty | 11:40:14 | -37.6 | Dark | Up | 30.4 | 147.0 | Up | 11:25:14 - 11:55:14 | 6612 |
| Kingman/Dolan Springs | 11:41:09 | -35.4 | Dark | Up | 33.1 | 149.4 | Up | 11:26:09 - 11:56:09 | 6610 |
| Searchlight/Boulder City | 11:40:47 | -36.1 | Dark | Up | 32.5 | 148.5 | Up | 11:25:47 - 11:55:47 | 6589 |
| Laughlin/Bullhead City | 11:41:09 | -35.8 | Dark | Up | 32.9 | 148.8 | Up | 11:26:09 - 11:56:09 | 6583 |
| Lee Vining | 11:39:38 | -39.4 | Dark | Up | 28.4 | 144.8 | Low | 11:24:38 - 11:54:38 | 6583 |
| Bishop | 11:39:52 | -38.8 | Dark | Up | 29.3 | 145.4 | Low | 11:24:52 - 11:54:52 | 6571 |
| Mohave Valley | 11:41:03 | -35.8 | Dark | Up | 33.1 | 148.7 | Up | 11:26:03 - 11:56:03 | 6562 |
| Lake Havasu City | 11:41:09 | -35.7 | Dark | Up | 33.6 | 148.9 | Up | 11:26:09 - 11:56:09 | 6543 |
| Lone Pine | 11:39:56 | -38.7 | Dark | Up | 30.0 | 145.5 | Up | 11:24:56 - 11:54:56 | 6527 |
| Parker | 11:40:56 | -35.7 | Dark | Up | 33.9 | 148.7 | Up | 11:25:56 - 11:55:56 | 6518 |
| Blythe | 11:41:03 | -36.0 | Dark | Up | 34.2 | 148.3 | Up | 11:26:03 - 11:56:03 | 6462 |
| Yuma | 11:41:03 | -36.1 | Dark | Up | 35.0 | 147.9 | Up | 11:26:03 - 11:56:03 | 6387 |
| Calipatria | 11:40:44 | -36.8 | Dark | Up | 34.2 | 147.0 | Up | 11:25:44 - 11:55:44 | 6377 |
| Idyllwild | 11:40:21 | -37.9 | Dark | Up | 33.1 | 146.0 | Up | 11:25:21 - 11:55:21 | 6367 |
| Wildwood | 11:39:49 | -39.5 | Dark | Up | 31.8 | 144.1 | Up | 11:24:49 - 11:54:49 | 6303 |
| CPSLO | 11:39:09 | -41.1 | Dark | Up | 29.8 | 142.4 | Low | 11:24:09 - 11:54:09 | 6301 |
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 500834, (2018/02/04 12:01UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 20.82 17 27Bet Lib 15:17:00.3 -09:22:59 2.6 9.51 41 8Alp1Lib 14:50:41.1 -15:59:51 5.1 0.50 37 PPM 229351 14:50:06.4 -15:31:33 7.2 0.53 37 PPM 229349 14:50:02.7 -16:06:06 9.1 0.38 37 500834 14:48:39.0 -15:55:02 16.1 37 Positions are for J2000
Event circumstances last updated at 2017/12/02 17:14:37 UT
Marc W. Buie, Southwest Research Institute