Event between (342842) 08YB3 and star UC4-787-032536 with event index number of 105811
Geocentric closest approach at 2018/02/04 04:50:45 UTC
J2000 position of star is 20:55:57.2 +67:22:29
Equinox of date position of star is 20:56:10.9 +67:26:39
Stellar brightness R=12.5,
use SENSEUP=16
Star is 102 degrees from the moon.
Moon is 83% illuminated.
TNO apparent brightness V=20.3
[RECON map]
TNO is 11.5 AU from the Sun
and 11.5 AU from the Earth.
The TNO is moving 26.9
km/sec on the sky relative to the star, or,
11.6 arcsec/hr.
The 1-sigma error in the time of the event is 21 seconds.
The 1-sigma cross-track error in the shadow position is
967 km.
The sky-plane scale is
8356.7 km/arcsec.
The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 3.1 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.3 sec chord
Dynamical classification is CENTAURR
Star training set for 342842, (2018/02/04 04:51UT) Object RA Dec mag sep mel Deneb 20:42:03.0 +45:20:45 1.3 22.18 112 Alderamin 21:19:00.6 +62:39:45 2.4 5.35 107 7 Cep 21:28:06.9 +66:53:18 5.3 3.14 105 PPM 022547 21:01:48.4 +66:46:50 8.4 0.86 103 PPM 022473 20:55:27.7 +67:33:41 9.7 0.14 102 342842 20:56:11.0 +67:26:41 12.5 102 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
5.0 sigma about the mid-time.
The median site spacing is 6.4 km
RECON observability=0.7 and success probability=0.0%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Niwot | 04:51:43 | -50.9 | Dark | Up | 20.2 | 347.5 | Low | 04:49:30 - 04:53:56 | 7095 |
| DCO | 04:52:12 | -46.9 | Dark | Up | 16.8 | 345.1 | Really Low | 04:49:59 - 04:54:25 | 6943 |
| Yuma | 04:52:19 | -46.2 | Dark | Down | 14.8 | 344.8 | Really Low | 04:50:06 - 04:54:32 | 6918 |
| Parker | 04:52:16 | -46.2 | Dark | Down | 16.1 | 344.8 | Really Low | 04:50:03 - 04:54:29 | 6912 |
| Patrick | 04:52:13 | -46.3 | Dark | Down | 17.2 | 344.8 | Really Low | 04:50:00 - 04:54:26 | 6908 |
| Blythe | 04:52:18 | -46.1 | Dark | Down | 15.7 | 344.7 | Really Low | 04:50:05 - 04:54:31 | 6907 |
| Lake Havasu City | 04:52:16 | -46.1 | Dark | Down | 16.5 | 344.8 | Really Low | 04:50:03 - 04:54:29 | 6905 |
| Kingman/Dolan Springs | 04:52:14 | -46.2 | Dark | Down | 17.1 | 344.8 | Really Low | 04:50:01 - 04:54:27 | 6904 |
| Mohave Valley | 04:52:16 | -45.8 | Dark | Down | 16.9 | 344.7 | Really Low | 04:50:03 - 04:54:29 | 6888 |
| Laughlin/Bullhead City | 04:52:15 | -45.8 | Dark | Down | 17.2 | 344.6 | Really Low | 04:50:02 - 04:54:28 | 6883 |
| Calipatria | 04:52:21 | -45.4 | Dark | Down | 15.4 | 344.5 | Really Low | 04:50:08 - 04:54:34 | 6873 |
| Searchlight/Boulder City | 04:52:16 | -45.4 | Dark | Down | 17.5 | 344.5 | Really Low | 04:50:03 - 04:54:29 | 6863 |
| Henderson | 04:52:15 | -45.2 | Dark | Down | 18.1 | 344.4 | Really Low | 04:50:02 - 04:54:28 | 6850 |
| Idyllwild | 04:52:23 | -44.4 | Dark | Down | 16.2 | 344.1 | Really Low | 04:50:10 - 04:54:36 | 6812 |
| Indian Springs | 04:52:16 | -44.6 | Dark | Down | 18.8 | 344.1 | Really Low | 04:50:03 - 04:54:29 | 6811 |
| Beatty | 04:52:19 | -43.6 | Dark | Down | 19.3 | 343.7 | Really Low | 04:50:06 - 04:54:32 | 6758 |
| Wildwood | 04:52:28 | -42.8 | Dark | Down | 17.0 | 343.4 | Really Low | 04:50:15 - 04:54:41 | 6719 |
| Tonopah | 04:52:18 | -43.0 | Dark | Down | 20.5 | 343.5 | Low | 04:50:05 - 04:54:31 | 6716 |
| Lone Pine | 04:52:23 | -42.7 | Dark | Down | 19.3 | 343.4 | Really Low | 04:50:10 - 04:54:36 | 6706 |
| Bishop | 04:52:23 | -42.3 | Dark | Down | 20.1 | 343.2 | Low | 04:50:10 - 04:54:36 | 6676 |
| Hawthorne | 04:52:21 | -41.8 | Dark | Down | 21.3 | 343.0 | Low | 04:50:08 - 04:54:34 | 6643 |
| Lee Vining | 04:52:23 | -41.6 | Dark | Down | 20.9 | 342.9 | Low | 04:50:10 - 04:54:36 | 6632 |
| Yerington | 04:52:23 | -41.3 | Dark | Down | 21.8 | 342.7 | Low | 04:50:10 - 04:54:36 | 6610 |
| CPSLO | 04:52:32 | -40.9 | Dark | Down | 18.7 | 342.7 | Really Low | 04:50:19 - 04:54:45 | 6603 |
| Gardnerville | 04:52:23 | -40.9 | Dark | Down | 21.9 | 342.5 | Low | 04:50:10 - 04:54:36 | 6584 |
| Carson City | 04:52:23 | -40.8 | Dark | Down | 22.2 | 342.5 | Low | 04:50:10 - 04:54:36 | 6577 |
| Reno | 04:52:22 | -40.7 | Dark | Down | 22.5 | 342.4 | Low | 04:50:09 - 04:54:35 | 6568 |
| Portola | 04:52:23 | -40.2 | Dark | Down | 22.9 | 342.2 | Low | 04:50:10 - 04:54:36 | 6532 |
| Susanville | 04:52:23 | -39.9 | Dark | Down | 23.6 | 342.1 | Low | 04:50:10 - 04:54:36 | 6511 |
| Quincy | 04:52:24 | -39.8 | Dark | Down | 23.2 | 342.0 | Low | 04:50:11 - 04:54:37 | 6508 |
| Gimple | 04:52:24 | -39.8 | Dark | Down | 23.3 | 342.0 | Low | 04:50:11 - 04:54:37 | 6507 |
| Cedarville | 04:52:20 | -39.9 | Dark | Down | 24.5 | 342.1 | Low | 04:50:07 - 04:54:33 | 6507 |
| Greenville | 04:52:24 | -39.7 | Dark | Down | 23.4 | 342.0 | Low | 04:50:11 - 04:54:37 | 6503 |
| Lakeview | 04:52:19 | -39.6 | Dark | Down | 25.2 | 341.9 | Low | 04:50:06 - 04:54:32 | 6483 |
| Fall River/Burney | 04:52:25 | -39.2 | Dark | Down | 24.3 | 341.7 | Low | 04:50:12 - 04:54:38 | 6462 |
| Paisley | 04:52:18 | -39.4 | Dark | Down | 25.7 | 341.8 | Low | 04:50:05 - 04:54:31 | 6461 |
| Tulelake | 04:52:22 | -38.9 | Dark | Down | 25.2 | 341.6 | Low | 04:50:09 - 04:54:35 | 6437 |
| PNWRO | 04:52:08 | -39.5 | Dark | Down | 28.5 | 341.8 | Low | 04:49:55 - 04:54:21 | 6435 |
| North Lake | 04:52:18 | -39.0 | Dark | Down | 26.3 | 341.6 | Low | 04:50:05 - 04:54:31 | 6431 |
| George/Umatilla | 04:52:09 | -39.2 | Dark | Down | 28.5 | 341.7 | Low | 04:49:56 - 04:54:22 | 6420 |
| Pasco | 04:52:09 | -39.3 | Dark | Down | 28.8 | 341.7 | Low | 04:49:56 - 04:54:22 | 6418 |
| Klamath Falls | 04:52:23 | -38.6 | Dark | Down | 25.5 | 341.4 | Low | 04:50:10 - 04:54:36 | 6417 |
| Chiloquin | 04:52:22 | -38.5 | Dark | Down | 25.9 | 341.3 | Low | 04:50:09 - 04:54:35 | 6405 |
| La Pine/Gilchrist | 04:52:19 | -38.4 | Dark | Down | 26.9 | 341.3 | Low | 04:50:06 - 04:54:32 | 6392 |
| Redmond | 04:52:17 | -38.5 | Dark | Down | 27.3 | 341.3 | Low | 04:50:04 - 04:54:30 | 6391 |
| Bend | 04:52:17 | -38.5 | Dark | Down | 27.2 | 341.3 | Low | 04:50:04 - 04:54:30 | 6391 |
| Oregon Observatory | 04:52:18 | -38.4 | Dark | Down | 27.0 | 341.3 | Low | 04:50:05 - 04:54:31 | 6389 |
| Madras/Culver | 04:52:16 | -38.4 | Dark | Down | 27.7 | 341.2 | Low | 04:50:03 - 04:54:29 | 6383 |
| Sisters | 04:52:18 | -38.2 | Dark | Down | 27.5 | 341.2 | Low | 04:50:05 - 04:54:31 | 6373 |
| Maupin | 04:52:15 | -38.3 | Dark | Down | 28.2 | 341.2 | Low | 04:50:02 - 04:54:28 | 6369 |
| Toppenish/White Swan | 04:52:12 | -38.4 | Dark | Down | 29.2 | 341.2 | Low | 04:49:59 - 04:54:25 | 6362 |
| Goldendale | 04:52:13 | -38.3 | Dark | Down | 28.7 | 341.1 | Low | 04:50:00 - 04:54:26 | 6361 |
| The Dalles | 04:52:15 | -38.1 | Dark | Down | 28.6 | 341.1 | Low | 04:50:02 - 04:54:28 | 6352 |
| Yakima | 04:52:11 | -38.2 | Dark | Down | 29.4 | 341.1 | Low | 04:49:58 - 04:54:24 | 6348 |
| Ellensburg | 04:52:11 | -38.1 | Dark | Down | 29.8 | 341.0 | Low | 04:49:58 - 04:54:24 | 6336 |
| Wenatchee | 04:52:09 | -38.1 | Dark | Down | 30.1 | 341.0 | Up | 04:49:56 - 04:54:22 | 6331 |
| Brewster | 04:52:06 | -38.2 | Dark | Down | 30.7 | 341.1 | Up | 04:49:53 - 04:54:19 | 6329 |
| Okanogan | 04:52:05 | -38.2 | Dark | Down | 30.9 | 341.1 | Up | 04:49:52 - 04:54:18 | 6328 |
| Entiat | 04:52:08 | -38.1 | Dark | Down | 30.3 | 341.0 | Up | 04:49:55 - 04:54:21 | 6326 |
| Tonasket | 04:52:05 | -38.2 | Dark | Down | 31.2 | 341.1 | Up | 04:49:52 - 04:54:18 | 6322 |
| Manson/Chelan | 04:52:08 | -38.0 | Dark | Down | 30.5 | 341.0 | Up | 04:49:55 - 04:54:21 | 6322 |
| Oroville | 04:52:04 | -38.1 | Dark | Down | 31.4 | 341.1 | Up | 04:49:51 - 04:54:17 | 6313 |
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 342842, (2018/02/04 04:51UT) Object RA Dec mag sep mel Deneb 20:41:25.9 +45:16:49 1.3 22.18 112 Alderamin 21:18:35.2 +62:35:09 2.4 5.35 107 7 Cep 21:27:46.1 +66:48:33 5.3 3.14 105 PPM 022547 21:01:32.3 +66:42:32 8.4 0.86 103 PPM 022473 20:55:14.2 +67:29:30 9.7 0.14 102 342842 20:55:57.2 +67:22:29 12.5 102 Positions are for J2000
Event circumstances last updated at 2017/12/02 17:14:28 UT
Marc W. Buie, Southwest Research Institute