Event between (69987) 98WA25 and star UC4-558-011718 with event index number of 110412
Geocentric closest approach at 2018/01/30 04:52:30 UTC
J2000 position of star is 04:50:14.5 +21:31:59
Equinox of date position of star is 04:51:19.0 +21:33:46
Stellar brightness R=14.7,
use SENSEUP=128
Star is 37 degrees from the moon.
Moon is 97% illuminated.
TNO apparent brightness V=23.4
[RECON map]
TNO is 42.4 AU from the Sun
and 41.8 AU from the Earth.
The TNO is moving 12.4
km/sec on the sky relative to the star, or,
1.5 arcsec/hr.
The 1-sigma error in the time of the event is 331 seconds.
The 1-sigma cross-track error in the shadow position is
2379 km.
The sky-plane scale is
30337.9 km/arcsec.
The TNO has an absolute magnitude Hv=7.0
Diameter=239.9 km assuming a 5% albedo -- 19.3 sec chord
Diameter=97.9 km assuming a 30% albedo -- 7.9 sec chord
Dynamical classification is CLASSICAL
Star training set for 69987, (2018/01/30 04:52UT) Object RA Dec mag sep mel Aldebaran 04:36:57.6 +16:32:39 0.8 6.06 41 Alnath 05:27:26.2 +28:37:16 1.6 10.79 30 PPM 093742 04:46:48.1 +23:39:36 6.1 2.34 38 PPM 093789 04:49:48.4 +21:20:47 7.3 0.41 38 PPM 093815 04:51:52.8 +21:26:13 11.3 0.18 37 69987 04:51:19.2 +21:33:47 14.7 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
2.7 sigma about the mid-time.
The median site spacing is 25.0 km
RECON observability=1.0 and success probability=0.2%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Oroville | 04:51:12 | -39.2 | Dark | Up | 61.4 | 200.1 | Up | 04:36:12 - 05:06:12 | 10977 |
| Tonasket | 04:51:13 | -39.3 | Dark | Up | 61.6 | 200.3 | Up | 04:36:13 - 05:06:13 | 10954 |
| Okanogan | 04:51:13 | -39.3 | Dark | Up | 62.0 | 200.2 | Up | 04:36:13 - 05:06:13 | 10921 |
| Brewster | 04:51:15 | -39.2 | Dark | Up | 62.3 | 200.0 | Up | 04:36:15 - 05:06:15 | 10894 |
| Manson/Chelan | 04:51:19 | -39.1 | Dark | Up | 62.6 | 199.5 | Up | 04:36:19 - 05:06:19 | 10874 |
| Entiat | 04:51:17 | -39.1 | Dark | Up | 62.8 | 199.4 | Up | 04:36:17 - 05:06:17 | 10852 |
| Wenatchee | 04:51:16 | -39.1 | Dark | Up | 63.1 | 199.4 | Up | 04:36:16 - 05:06:16 | 10826 |
| Ellensburg | 04:51:17 | -39.1 | Dark | Up | 63.5 | 199.2 | Up | 04:36:17 - 05:06:17 | 10785 |
| Yakima | 04:51:17 | -39.2 | Dark | Up | 63.9 | 199.5 | Up | 04:36:17 - 05:06:17 | 10744 |
| Toppenish/White Swan | 04:51:18 | -39.4 | Dark | Up | 64.0 | 200.0 | Up | 04:36:18 - 05:06:18 | 10722 |
| Pasco | 04:51:09 | -40.2 | Dark | Up | 63.8 | 202.6 | Up | 04:36:09 - 05:06:09 | 10708 |
| PNWRO | 04:51:08 | -40.5 | Dark | Up | 64.0 | 203.2 | Up | 04:36:08 - 05:06:08 | 10682 |
| George/Umatilla | 04:51:12 | -40.2 | Dark | Up | 64.2 | 202.4 | Up | 04:36:12 - 05:06:12 | 10674 |
| Goldendale | 04:51:19 | -39.3 | Dark | Up | 64.7 | 199.5 | Up | 04:36:19 - 05:06:19 | 10667 |
| The Dalles | 04:51:20 | -39.1 | Dark | Up | 65.0 | 198.9 | Up | 04:36:20 - 05:06:20 | 10644 |
| Maupin | 04:51:21 | -39.3 | Dark | Up | 65.3 | 199.4 | Up | 04:36:21 - 05:06:21 | 10602 |
| Madras/Culver | 04:51:22 | -39.4 | Dark | Up | 65.9 | 199.7 | Up | 04:36:22 - 05:06:22 | 10546 |
| Sisters | 04:51:26 | -39.2 | Dark | Up | 66.3 | 199.0 | Up | 04:36:26 - 05:06:26 | 10512 |
| Redmond | 04:51:21 | -39.4 | Dark | Up | 66.2 | 199.9 | Up | 04:36:21 - 05:06:21 | 10509 |
| Bend | 04:51:24 | -39.4 | Dark | Up | 66.4 | 199.8 | Up | 04:36:24 - 05:06:24 | 10487 |
| Oregon Observatory | 04:51:24 | -39.4 | Dark | Up | 66.6 | 199.6 | Up | 04:36:24 - 05:06:24 | 10470 |
| La Pine/Gilchrist | 04:51:25 | -39.4 | Dark | Up | 66.8 | 199.6 | Up | 04:36:25 - 05:06:25 | 10449 |
| North Lake | 04:51:19 | -39.9 | Dark | Up | 67.1 | 201.3 | Up | 04:36:19 - 05:06:19 | 10402 |
| Paisley | 04:51:19 | -40.3 | Dark | Up | 67.5 | 202.6 | Up | 04:36:19 - 05:06:19 | 10345 |
| Chiloquin | 04:51:24 | -39.4 | Dark | Up | 68.0 | 199.7 | Up | 04:36:24 - 05:06:24 | 10335 |
| Klamath Falls | 04:51:25 | -39.5 | Dark | Up | 68.3 | 200.2 | Up | 04:36:25 - 05:06:25 | 10299 |
| Lakeview | 04:51:16 | -40.5 | Dark | Up | 67.9 | 203.5 | Up | 04:36:16 - 05:06:16 | 10291 |
| Tulelake | 04:51:24 | -39.8 | Dark | Up | 68.4 | 201.2 | Up | 04:36:24 - 05:06:24 | 10270 |
| Cedarville | 04:51:14 | -40.8 | Dark | Up | 68.5 | 204.6 | Up | 04:36:14 - 05:06:14 | 10222 |
| Fall River/Burney | 04:51:23 | -40.0 | Dark | Up | 69.3 | 202.2 | Up | 04:36:23 - 05:06:23 | 10174 |
| Susanville | 04:51:17 | -40.7 | Dark | Up | 69.6 | 204.7 | Up | 04:36:17 - 05:06:17 | 10106 |
| Niwot | 04:49:37 | -51.7 | Dark | Up | 62.4 | 234.9 | Up | 04:34:37 - 05:04:37 | 10105 |
| Greenville | 04:51:19 | -40.5 | Dark | Up | 70.0 | 204.3 | Up | 04:36:19 - 05:06:19 | 10078 |
| Gimple | 04:51:19 | -40.6 | Dark | Up | 70.0 | 204.5 | Up | 04:36:19 - 05:06:19 | 10078 |
| Quincy | 04:51:19 | -40.6 | Dark | Up | 70.2 | 204.5 | Up | 04:36:19 - 05:06:19 | 10057 |
| Portola | 04:51:16 | -41.0 | Dark | Up | 70.1 | 205.8 | Up | 04:36:16 - 05:06:16 | 10042 |
| Reno | 04:51:12 | -41.5 | Dark | Up | 70.1 | 207.8 | Up | 04:36:12 - 05:06:12 | 10013 |
| Carson City | 04:51:10 | -41.6 | Dark | Up | 70.5 | 208.3 | Up | 04:36:10 - 05:06:10 | 9975 |
| Yerington | 04:51:07 | -42.1 | Dark | Up | 70.4 | 210.1 | Up | 04:36:07 - 05:06:07 | 9953 |
| Gardnerville | 04:51:10 | -41.7 | Dark | Up | 70.6 | 208.7 | Up | 04:36:10 - 05:06:10 | 9949 |
| Hawthorne | 04:51:03 | -42.6 | Dark | Up | 70.6 | 212.1 | Up | 04:36:03 - 05:06:03 | 9903 |
| Tonopah | 04:50:54 | -43.7 | Dark | Up | 70.4 | 216.2 | Up | 04:35:54 - 05:05:54 | 9852 |
| Lee Vining | 04:51:06 | -42.3 | Dark | Up | 71.3 | 211.8 | Up | 04:36:06 - 05:06:06 | 9844 |
| Bishop | 04:51:00 | -43.0 | Dark | Up | 71.5 | 214.5 | Up | 04:36:00 - 05:06:00 | 9779 |
| Beatty | 04:50:51 | -44.3 | Dark | Up | 71.1 | 219.3 | Up | 04:35:51 - 05:05:51 | 9728 |
| Lone Pine | 04:50:59 | -43.4 | Dark | Up | 71.9 | 216.7 | Up | 04:35:59 - 05:05:59 | 9697 |
| Indian Springs | 04:50:40 | -45.2 | Dark | Up | 70.8 | 222.4 | Up | 04:35:40 - 05:05:40 | 9694 |
| Henderson | 04:50:38 | -45.8 | Dark | Up | 70.8 | 225.0 | Up | 04:35:38 - 05:05:38 | 9637 |
| Searchlight/Boulder City | 04:50:36 | -46.0 | Dark | Up | 71.1 | 226.3 | Up | 04:35:36 - 05:05:36 | 9575 |
| Patrick | 04:50:28 | -46.8 | Dark | Up | 70.6 | 228.6 | Up | 04:35:28 - 05:05:28 | 9570 |
| CPSLO | 04:51:16 | -41.5 | Dark | Up | 74.1 | 212.1 | Up | 04:36:16 - 05:06:16 | 9561 |
| Kingman/Dolan Springs | 04:50:31 | -46.7 | Dark | Up | 70.8 | 228.7 | Up | 04:35:31 - 05:05:31 | 9546 |
| Laughlin/Bullhead City | 04:50:33 | -46.3 | Dark | Up | 71.1 | 227.7 | Up | 04:35:33 - 05:05:33 | 9543 |
| DCO | 04:50:24 | -47.4 | Dark | Up | 70.3 | 230.7 | Up | 04:35:24 - 05:05:24 | 9539 |
| Mohave Valley | 04:50:33 | -46.4 | Dark | Up | 71.3 | 228.3 | Up | 04:35:33 - 05:05:33 | 9514 |
| Lake Havasu City | 04:50:33 | -46.7 | Dark | Up | 71.4 | 229.7 | Up | 04:35:33 - 05:05:33 | 9471 |
| Parker | 04:50:30 | -46.7 | Dark | Up | 71.6 | 230.6 | Up | 04:35:30 - 05:05:30 | 9433 |
| Wildwood | 04:51:03 | -43.3 | Dark | Up | 74.1 | 220.4 | Up | 04:36:03 - 05:06:03 | 9427 |
| Idyllwild | 04:50:48 | -44.9 | Dark | Up | 73.4 | 226.1 | Up | 04:35:48 - 05:05:48 | 9387 |
| Blythe | 04:50:33 | -46.6 | Dark | Up | 72.2 | 231.2 | Up | 04:35:33 - 05:05:33 | 9375 |
| Calipatria | 04:50:39 | -45.9 | Dark | Up | 73.1 | 230.4 | Up | 04:35:39 - 05:05:39 | 9321 |
| Yuma | 04:50:32 | -46.7 | Dark | Up | 72.8 | 233.4 | Up | 04:35:32 - 05:05:32 | 9274 |
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 69987, (2018/01/30 04:52UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:30 0.8 6.06 41 Alnath 05:26:17.5 +28:36:24 1.6 10.79 30 PPM 093742 04:45:42.5 +23:37:41 6.1 2.34 38 PPM 093789 04:48:43.8 +21:18:56 7.3 0.41 38 PPM 093815 04:50:48.2 +21:24:26 11.3 0.18 37 69987 04:50:14.5 +21:31:59 14.7 37 Positions are for J2000
Event circumstances last updated at 2018/01/18 17:11:45 UT
Marc W. Buie, Southwest Research Institute