Event between (495603) 15AM281 and star UC4-640-045324 with event index number of 200793
Geocentric closest approach at 2018/03/25 06:32:38 UTC
J2000 position of star is 10:04:45.2 +37:50:06
Equinox of date position of star is 10:05:49.8 +37:44:48
Stellar brightness R=16.5,
use SENSEUP=128
Star is 45 degrees from the moon.
Moon is 57% illuminated.
TNO apparent brightness V=21.3
[RECON map]
TNO is 43.7 AU from the Sun
and 43.0 AU from the Earth.
The TNO is moving 19.2
km/sec on the sky relative to the star, or,
2.2 arcsec/hr.
The 1-sigma error in the time of the event is 121 seconds.
The 1-sigma cross-track error in the shadow position is
1991 km.
The sky-plane scale is
31187.4 km/arcsec.
The TNO has an absolute magnitude Hv=4.8
Diameter=660.7 km assuming a 5% albedo -- 34.4 sec chord
Diameter=269.7 km assuming a 30% albedo -- 14.0 sec chord
Dynamical classification is 5:2EEE+5:2EII
Star training set for 495603, (2018/03/25 06:33UT) Object RA Dec mag sep mel Regulus 10:09:20.5 +11:52:39 1.3 25.88 47 Merak 11:02:55.8 +56:17:03 2.4 20.84 58 21 LMi 10:08:30.0 +35:09:18 4.6 2.65 45 PPM 074956 10:04:58.6 +37:55:52 7.2 0.25 45 PPM 074970 10:06:23.3 +37:33:20 9.1 0.22 45 495603 10:05:50.3 +37:44:45 16.5 45 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 27.7 km
RECON observability=1.0 and success probability=2.9%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Oroville | 06:31:53 | -35.5 | Dark | Up | 76.8 | 216.8 | Up | 06:21:17 - 06:42:28 | 6863 |
| Tonasket | 06:31:53 | -35.7 | Dark | Up | 76.9 | 217.5 | Up | 06:21:17 - 06:42:28 | 6837 |
| Okanogan | 06:31:54 | -36.0 | Dark | Up | 77.3 | 217.9 | Up | 06:21:18 - 06:42:29 | 6801 |
| Brewster | 06:31:54 | -36.1 | Dark | Up | 77.6 | 218.0 | Up | 06:21:18 - 06:42:29 | 6771 |
| Manson/Chelan | 06:31:55 | -36.2 | Dark | Up | 77.9 | 217.5 | Up | 06:21:20 - 06:42:31 | 6749 |
| Entiat | 06:31:56 | -36.4 | Dark | Up | 78.1 | 217.9 | Up | 06:21:20 - 06:42:31 | 6725 |
| Wenatchee | 06:31:56 | -36.5 | Dark | Up | 78.3 | 218.3 | Up | 06:21:20 - 06:42:31 | 6698 |
| Ellensburg | 06:31:57 | -36.8 | Dark | Up | 78.7 | 218.8 | Up | 06:21:21 - 06:42:32 | 6653 |
| Yakima | 06:31:57 | -37.2 | Dark | Up | 79.1 | 220.1 | Up | 06:21:22 - 06:42:33 | 6608 |
| Toppenish/White Swan | 06:31:57 | -37.4 | Dark | Up | 79.1 | 221.4 | Up | 06:21:21 - 06:42:32 | 6584 |
| Pasco | 06:31:52 | -37.9 | Dark | Up | 78.6 | 225.9 | Up | 06:21:16 - 06:42:27 | 6568 |
| PNWRO | 06:31:51 | -38.2 | Dark | Up | 78.7 | 227.5 | Up | 06:21:15 - 06:42:26 | 6541 |
| George/Umatilla | 06:31:52 | -38.2 | Dark | Up | 79.0 | 226.5 | Up | 06:21:17 - 06:42:28 | 6532 |
| Goldendale | 06:31:59 | -37.7 | Dark | Up | 79.7 | 221.9 | Up | 06:21:23 - 06:42:34 | 6524 |
| The Dalles | 06:32:00 | -37.8 | Dark | Up | 80.1 | 221.4 | Up | 06:21:24 - 06:42:35 | 6500 |
| Maupin | 06:31:59 | -38.2 | Dark | Up | 80.3 | 223.5 | Up | 06:21:24 - 06:42:35 | 6454 |
| Madras/Culver | 06:31:59 | -38.6 | Dark | Up | 80.8 | 225.6 | Up | 06:21:24 - 06:42:35 | 6394 |
| Sisters | 06:32:02 | -38.7 | Dark | Up | 81.2 | 225.4 | Up | 06:21:26 - 06:42:37 | 6358 |
| Redmond | 06:32:00 | -38.9 | Dark | Up | 81.0 | 227.0 | Up | 06:21:24 - 06:42:35 | 6354 |
| Bend | 06:32:01 | -39.0 | Dark | Up | 81.2 | 227.5 | Up | 06:21:25 - 06:42:36 | 6331 |
| Oregon Observatory | 06:32:01 | -39.1 | Dark | Up | 81.4 | 227.9 | Up | 06:21:25 - 06:42:36 | 6312 |
| La Pine/Gilchrist | 06:32:01 | -39.3 | Dark | Up | 81.6 | 228.7 | Up | 06:21:25 - 06:42:36 | 6290 |
| North Lake | 06:31:59 | -39.9 | Dark | Up | 81.5 | 233.2 | Up | 06:21:24 - 06:42:35 | 6240 |
| Paisley | 06:31:58 | -40.5 | Dark | Up | 81.6 | 237.5 | Up | 06:21:22 - 06:42:33 | 6178 |
| Chiloquin | 06:32:03 | -40.1 | Dark | Up | 82.5 | 233.5 | Up | 06:21:28 - 06:42:39 | 6168 |
| Klamath Falls | 06:32:03 | -40.4 | Dark | Up | 82.6 | 235.9 | Up | 06:21:28 - 06:42:39 | 6130 |
| Lakeview | 06:31:57 | -41.0 | Dark | Up | 81.8 | 241.1 | Up | 06:21:21 - 06:42:32 | 6121 |
| Tulelake | 06:32:02 | -40.7 | Dark | Up | 82.6 | 238.8 | Up | 06:21:26 - 06:42:37 | 6099 |
| Cedarville | 06:31:56 | -41.6 | Dark | Up | 82.0 | 245.7 | Up | 06:21:21 - 06:42:32 | 6048 |
| Fall River/Burney | 06:32:02 | -41.5 | Dark | Up | 83.0 | 245.4 | Up | 06:21:26 - 06:42:37 | 5998 |
| Niwot | 06:30:52 | -47.3 | Dark | Up | 71.2 | 270.8 | Up | 06:20:17 - 06:41:28 | 5954 |
| Susanville | 06:31:58 | -42.4 | Dark | Up | 82.7 | 252.2 | Up | 06:21:23 - 06:42:34 | 5926 |
| Greenville | 06:32:00 | -42.5 | Dark | Up | 83.0 | 253.6 | Up | 06:21:24 - 06:42:35 | 5896 |
| Gimple | 06:31:59 | -42.5 | Dark | Up | 82.9 | 253.8 | Up | 06:21:24 - 06:42:35 | 5896 |
| Quincy | 06:32:00 | -42.6 | Dark | Up | 83.0 | 255.2 | Up | 06:21:24 - 06:42:35 | 5874 |
| Portola | 06:31:58 | -42.9 | Dark | Up | 82.7 | 257.1 | Up | 06:21:22 - 06:42:33 | 5858 |
| Reno | 06:31:56 | -43.4 | Dark | Up | 82.3 | 260.3 | Up | 06:21:20 - 06:42:31 | 5827 |
| Carson City | 06:31:55 | -43.7 | Dark | Up | 82.3 | 262.9 | Up | 06:21:20 - 06:42:31 | 5787 |
| Yerington | 06:31:52 | -44.2 | Dark | Up | 81.9 | 265.1 | Up | 06:21:17 - 06:42:28 | 5765 |
| Gardnerville | 06:31:55 | -44.0 | Dark | Up | 82.3 | 264.8 | Up | 06:21:19 - 06:42:30 | 5760 |
| Hawthorne | 06:31:49 | -44.8 | Dark | Up | 81.5 | 268.7 | Up | 06:21:14 - 06:42:25 | 5712 |
| Tonopah | 06:31:44 | -45.7 | Dark | Up | 80.4 | 272.4 | Up | 06:21:08 - 06:42:19 | 5660 |
| Lee Vining | 06:31:52 | -45.1 | Dark | Up | 81.8 | 272.3 | Up | 06:21:17 - 06:42:28 | 5650 |
| Bishop | 06:31:49 | -45.9 | Dark | Up | 81.2 | 276.4 | Up | 06:21:13 - 06:42:24 | 5583 |
| Beatty | 06:31:42 | -46.9 | Dark | Up | 79.9 | 279.1 | Up | 06:21:06 - 06:42:17 | 5532 |
| Lone Pine | 06:31:47 | -46.6 | Dark | Up | 80.9 | 281.2 | Up | 06:21:11 - 06:42:22 | 5498 |
| Indian Springs | 06:31:37 | -47.6 | Dark | Up | 79.0 | 280.7 | Up | 06:21:01 - 06:42:12 | 5497 |
| Henderson | 06:31:33 | -48.4 | Dark | Up | 78.4 | 283.2 | Up | 06:20:57 - 06:42:08 | 5439 |
| Searchlight/Boulder City | 06:31:33 | -48.9 | Dark | Up | 78.2 | 285.8 | Up | 06:20:58 - 06:42:09 | 5375 |
| Patrick | 06:31:28 | -49.3 | Dark | Up | 77.3 | 285.6 | Up | 06:20:53 - 06:42:04 | 5372 |
| CPSLO | 06:31:59 | -46.5 | Dark | Up | 82.5 | 292.2 | Up | 06:21:24 - 06:42:35 | 5359 |
| Kingman/Dolan Springs | 06:31:29 | -49.5 | Dark | Up | 77.4 | 286.6 | Up | 06:20:53 - 06:42:04 | 5347 |
| Laughlin/Bullhead City | 06:31:31 | -49.3 | Dark | Up | 77.8 | 287.0 | Up | 06:20:55 - 06:42:06 | 5343 |
| DCO | 06:31:25 | -49.9 | Dark | Up | 76.7 | 286.6 | Up | 06:20:50 - 06:42:01 | 5341 |
| Mohave Valley | 06:31:30 | -49.5 | Dark | Up | 77.7 | 288.2 | Up | 06:20:55 - 06:42:06 | 5313 |
| Lake Havasu City | 06:31:30 | -50.0 | Dark | Up | 77.4 | 289.7 | Up | 06:20:55 - 06:42:06 | 5269 |
| Parker | 06:31:30 | -50.3 | Dark | Up | 77.3 | 291.2 | Up | 06:20:54 - 06:42:05 | 5230 |
| Wildwood | 06:31:50 | -48.5 | Dark | Up | 80.5 | 296.2 | Up | 06:21:15 - 06:42:26 | 5221 |
| Idyllwild | 06:31:41 | -49.6 | Dark | Up | 78.9 | 295.3 | Up | 06:21:06 - 06:42:17 | 5181 |
| Blythe | 06:31:31 | -50.6 | Dark | Up | 77.3 | 293.6 | Up | 06:20:56 - 06:42:07 | 5172 |
| Calipatria | 06:31:35 | -50.7 | Dark | Up | 77.8 | 296.6 | Up | 06:21:00 - 06:42:11 | 5115 |
| Yuma | 06:31:31 | -51.4 | Dark | Up | 76.9 | 297.3 | Up | 06:20:56 - 06:42:07 | 5069 |
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 495603, (2018/03/25 06:33UT) Object RA Dec mag sep mel Regulus 10:08:22.0 +11:58:02 1.3 25.88 47 Merak 11:01:50.7 +56:22:57 2.4 20.84 58 21 LMi 10:07:25.9 +35:14:41 4.6 2.65 45 PPM 074956 10:03:53.4 +38:01:11 7.2 0.25 45 PPM 074970 10:05:18.3 +37:38:41 9.1 0.22 45 495603 10:04:45.2 +37:50:06 16.5 45 Positions are for J2000
Event circumstances last updated at 2018/02/04 17:10:48 UT
Marc W. Buie, Southwest Research Institute