Event between 98WS31 and star UC4-597-017239 with event index number of 106514
Geocentric closest approach at 2017/11/20 11:27:24 UTC
J2000 position of star is 05:17:04.5 +29:19:44
Equinox of date position of star is 05:18:10.7 +29:20:48
Stellar brightness R=12.6,
use SENSEUP=16
Star is 170 degrees from the moon.
Moon is 4% illuminated.
TNO apparent brightness V=23.4
[RECON map]
TNO is 32.5 AU from the Sun
and 31.6 AU from the Earth.
The TNO is moving 22.4
km/sec on the sky relative to the star, or,
3.5 arcsec/hr.
The 1-sigma error in the time of the event is 369 seconds.
The 1-sigma cross-track error in the shadow position is
1679 km.
The sky-plane scale is
22896.5 km/arcsec.
The TNO has an absolute magnitude Hv=8.3
Diameter=134.3 km assuming a 5% albedo -- 6.0 sec chord
Diameter=54.8 km assuming a 30% albedo -- 2.4 sec chord
Dynamical classification is 3:2E
Star training set for 98WS31, (2017/11/20 11:27UT) Object RA Dec mag sep mel Aldebaran 04:36:56.9 +16:32:38 0.8 15.92 170 Alnath 05:27:25.4 +28:37:15 1.6 2.14 170 PPM 094297 05:22:21.0 +29:35:10 5.7 0.93 169 PPM 094235 05:18:23.5 +28:55:23 7.4 0.43 170 PPM 094212 05:16:55.0 +29:29:06 9.7 0.31 169 PPM 094221 05:17:25.0 +29:08:31 10.1 0.27 170 98WS31 05:18:12.7 +29:20:50 12.6 169 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 22.9 km
RECON observability=1.0 and success probability=5.9%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Oroville | 11:25:42 | -37.2 | Dark | Down | 58.5 | 243.5 | Up | 11:10:42 - 11:40:42 | 4924 |
| Tonasket | 11:25:42 | -37.3 | Dark | Down | 58.6 | 243.8 | Up | 11:10:42 - 11:40:42 | 4901 |
| Okanogan | 11:25:41 | -37.4 | Dark | Down | 58.9 | 244.1 | Up | 11:10:41 - 11:40:41 | 4865 |
| Brewster | 11:25:41 | -37.6 | Dark | Down | 59.1 | 244.3 | Up | 11:10:41 - 11:40:41 | 4834 |
| Manson/Chelan | 11:25:42 | -37.9 | Dark | Down | 59.4 | 244.1 | Up | 11:10:42 - 11:40:42 | 4807 |
| Entiat | 11:25:42 | -38.0 | Dark | Down | 59.6 | 244.4 | Up | 11:10:42 - 11:40:42 | 4783 |
| Wenatchee | 11:25:42 | -38.1 | Dark | Down | 59.7 | 244.7 | Up | 11:10:42 - 11:40:42 | 4756 |
| Ellensburg | 11:25:42 | -38.4 | Dark | Down | 60.0 | 245.0 | Up | 11:10:42 - 11:40:42 | 4710 |
| Yakima | 11:25:41 | -38.5 | Dark | Down | 60.2 | 245.6 | Up | 11:10:41 - 11:40:41 | 4669 |
| Pasco | 11:25:36 | -37.6 | Dark | Down | 59.5 | 247.9 | Up | 11:10:36 - 11:40:36 | 4663 |
| Toppenish/White Swan | 11:25:41 | -38.4 | Dark | Down | 60.2 | 246.2 | Up | 11:10:41 - 11:40:41 | 4651 |
| PNWRO | 11:25:35 | -37.5 | Dark | Down | 59.4 | 248.5 | Up | 11:10:35 - 11:40:35 | 4643 |
| George/Umatilla | 11:25:37 | -37.8 | Dark | Down | 59.7 | 248.2 | Up | 11:10:37 - 11:40:37 | 4625 |
| Goldendale | 11:25:41 | -38.8 | Dark | Down | 60.7 | 246.6 | Up | 11:10:41 - 11:40:41 | 4587 |
| The Dalles | 11:25:41 | -39.1 | Dark | Down | 61.0 | 246.5 | Up | 11:10:41 - 11:40:41 | 4557 |
| Maupin | 11:25:40 | -39.1 | Dark | Down | 61.1 | 247.3 | Up | 11:10:40 - 11:40:40 | 4516 |
| Madras/Culver | 11:25:39 | -39.2 | Dark | Down | 61.4 | 248.2 | Up | 11:10:39 - 11:40:39 | 4460 |
| Redmond | 11:25:39 | -39.3 | Dark | Down | 61.5 | 248.7 | Up | 11:10:39 - 11:40:39 | 4422 |
| Sisters | 11:25:40 | -39.6 | Dark | Down | 61.8 | 248.2 | Up | 11:10:40 - 11:40:40 | 4417 |
| Bend | 11:25:39 | -39.5 | Dark | Down | 61.7 | 248.9 | Up | 11:10:39 - 11:40:39 | 4398 |
| Niwot | 11:24:45 | -28.0 | Dark | Down | 50.8 | 268.9 | Up | 11:09:45 - 11:39:45 | 4396 |
| Oregon Observatory | 11:25:39 | -39.6 | Dark | Down | 61.8 | 249.1 | Up | 11:10:39 - 11:40:39 | 4377 |
| La Pine/Gilchrist | 11:25:39 | -39.7 | Dark | Down | 62.0 | 249.4 | Up | 11:10:39 - 11:40:39 | 4355 |
| North Lake | 11:25:37 | -39.3 | Dark | Down | 61.7 | 250.8 | Up | 11:10:37 - 11:40:37 | 4322 |
| Paisley | 11:25:34 | -39.2 | Dark | Down | 61.6 | 252.2 | Up | 11:10:34 - 11:40:34 | 4272 |
| Chiloquin | 11:25:38 | -40.1 | Dark | Down | 62.6 | 251.0 | Up | 11:10:38 - 11:40:38 | 4233 |
| Lakeview | 11:25:33 | -39.1 | Dark | Down | 61.7 | 253.3 | Up | 11:10:33 - 11:40:33 | 4224 |
| Klamath Falls | 11:25:37 | -40.2 | Dark | Down | 62.6 | 251.7 | Up | 11:10:37 - 11:40:37 | 4199 |
| Tulelake | 11:25:36 | -40.0 | Dark | Down | 62.5 | 252.5 | Up | 11:10:36 - 11:40:36 | 4177 |
| Cedarville | 11:25:31 | -39.1 | Dark | Down | 61.7 | 254.6 | Up | 11:10:31 - 11:40:31 | 4160 |
| Fall River/Burney | 11:25:34 | -40.1 | Dark | Down | 62.7 | 254.3 | Up | 11:10:34 - 11:40:34 | 4084 |
| Susanville | 11:25:31 | -39.6 | Dark | Down | 62.3 | 256.2 | Up | 11:10:31 - 11:40:31 | 4034 |
| Gimple | 11:25:31 | -39.8 | Dark | Down | 62.6 | 256.5 | Up | 11:10:31 - 11:40:31 | 4000 |
| Greenville | 11:25:31 | -39.9 | Dark | Down | 62.6 | 256.4 | Up | 11:10:31 - 11:40:31 | 3999 |
| Quincy | 11:25:31 | -39.9 | Dark | Down | 62.7 | 256.8 | Up | 11:10:31 - 11:40:31 | 3978 |
| Portola | 11:25:29 | -39.5 | Dark | Down | 62.4 | 257.5 | Up | 11:10:29 - 11:40:29 | 3975 |
| Reno | 11:25:26 | -39.1 | Dark | Down | 61.9 | 258.6 | Up | 11:10:26 - 11:40:26 | 3961 |
| Carson City | 11:25:26 | -39.1 | Dark | Down | 62.0 | 259.2 | Up | 11:10:26 - 11:40:26 | 3924 |
| Yerington | 11:25:23 | -38.6 | Dark | Down | 61.5 | 260.2 | Up | 11:10:23 - 11:40:23 | 3917 |
| Gardnerville | 11:25:25 | -39.1 | Dark | Down | 62.0 | 259.7 | Up | 11:10:25 - 11:40:25 | 3899 |
| Hawthorne | 11:25:21 | -38.3 | Dark | Down | 61.2 | 261.4 | Up | 11:10:21 - 11:40:21 | 3881 |
| Tonopah | 11:25:15 | -37.2 | Dark | Down | 60.2 | 263.4 | Up | 11:10:15 - 11:40:15 | 3865 |
| Lee Vining | 11:25:22 | -38.7 | Dark | Down | 61.7 | 262.1 | Up | 11:10:22 - 11:40:22 | 3811 |
| Bishop | 11:25:18 | -38.2 | Dark | Down | 61.2 | 263.7 | Up | 11:10:18 - 11:40:18 | 3764 |
| Beatty | 11:25:12 | -36.9 | Dark | Down | 59.9 | 265.7 | Up | 11:10:12 - 11:40:12 | 3755 |
| Indian Springs | 11:25:08 | -36.1 | Dark | Down | 59.1 | 267.0 | Up | 11:10:08 - 11:40:08 | 3747 |
| Henderson | 11:25:06 | -35.5 | Dark | Down | 58.6 | 268.3 | Up | 11:10:06 - 11:40:06 | 3709 |
| Lone Pine | 11:25:16 | -38.0 | Dark | Down | 61.0 | 265.3 | Up | 11:10:16 - 11:40:16 | 3692 |
| Patrick | 11:25:01 | -34.6 | Dark | Down | 57.7 | 270.0 | Up | 11:10:01 - 11:40:01 | 3673 |
| DCO | 11:24:58 | -34.1 | Dark | Down | 57.1 | 270.9 | Up | 11:09:58 - 11:39:58 | 3660 |
| Searchlight/Boulder City | 11:25:04 | -35.5 | Dark | Down | 58.6 | 269.3 | Up | 11:10:04 - 11:40:04 | 3651 |
| Kingman/Dolan Springs | 11:25:01 | -34.8 | Dark | Down | 57.9 | 270.2 | Up | 11:10:01 - 11:40:01 | 3645 |
| Laughlin/Bullhead City | 11:25:03 | -35.2 | Dark | Down | 58.3 | 270.0 | Up | 11:10:03 - 11:40:03 | 3629 |
| Mohave Valley | 11:25:02 | -35.2 | Dark | Down | 58.3 | 270.4 | Up | 11:10:02 - 11:40:02 | 3600 |
| Lake Havasu City | 11:25:01 | -35.0 | Dark | Down | 58.1 | 271.2 | Up | 11:10:01 - 11:40:01 | 3565 |
| Parker | 11:25:00 | -35.0 | Dark | Down | 58.0 | 271.8 | Up | 11:10:00 - 11:40:00 | 3529 |
| CPSLO | 11:25:23 | -40.1 | Dark | Down | 63.2 | 266.0 | Up | 11:10:23 - 11:40:23 | 3495 |
| Blythe | 11:25:00 | -35.2 | Dark | Down | 58.3 | 272.5 | Up | 11:10:00 - 11:40:00 | 3466 |
| Idyllwild | 11:25:08 | -36.9 | Dark | Down | 60.0 | 271.2 | Up | 11:10:08 - 11:40:08 | 3423 |
| Wildwood | 11:25:14 | -38.5 | Dark | Down | 61.6 | 269.6 | Up | 11:10:14 - 11:40:14 | 3415 |
| Calipatria | 11:25:03 | -35.9 | Dark | Down | 59.0 | 272.8 | Up | 11:10:03 - 11:40:03 | 3389 |
| Yuma | 11:24:59 | -35.2 | Dark | Down | 58.3 | 274.0 | Up | 11:09:59 - 11:39:59 | 3368 |
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 98WS31, (2017/11/20 11:27UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:30 0.8 15.92 170 Alnath 05:26:17.5 +28:36:24 1.6 2.14 170 PPM 094297 05:21:12.7 +29:34:11 5.7 0.93 169 PPM 094235 05:17:15.5 +28:54:17 7.4 0.43 170 PPM 094212 05:15:46.7 +29:27:58 9.7 0.31 169 PPM 094221 05:16:16.9 +29:07:24 10.1 0.27 170 98WS31 05:17:04.5 +29:19:44 12.6 169 Positions are for J2000
Event circumstances last updated at 2017/05/16 18:35:43 UT
Marc W. Buie, Southwest Research Institute