Event between 98WS31 and star UC4-594-014792 with event index number of 52875
Geocentric closest approach at 2017/03/15 06:23:18 UTC
J2000 position of star is 04:59:39.9 +28:42:43
Equinox of date position of star is 05:00:43.3 +28:44:10
Stellar brightness R=15.9
Star is 128 degrees from the moon.
Moon is 93% illuminated.
TNO apparent brightness V=23.6
[RECON map]
TNO is 32.4 AU from the Sun
and 32.5 AU from the Earth.
The TNO is moving 9.7
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 1173 seconds.
The 1-sigma cross-track error in the shadow position is
3119 km.
The sky-plane scale is
23586.3 km/arcsec.
The TNO has an absolute magnitude Hv=8.3
Diameter=134.3 km assuming a 5% albedo -- 13.9 sec chord
Diameter=54.8 km assuming a 30% albedo -- 5.7 sec chord
Dynamical classification is 3:2E
Star training set for 98WS31, (2017/03/15 06:23UT) Object RA Dec mag sep mel Aldebaran 04:36:54.6 +16:32:33 0.8 13.37 136 3Iot Aur 04:58:07.0 +33:11:30 2.7 4.49 127 PPM 093846 04:53:51.7 +27:55:30 6.2 1.72 130 PPM 093934 04:59:51.9 +29:52:07 7.9 1.15 128 PPM 093962 05:01:39.3 +29:13:13 10.0 0.52 128 PPM 093933 04:59:50.8 +28:48:51 10.4 0.21 128 98WS31 05:00:45.0 +28:44:12 15.9 128 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
0.8 sigma about the mid-time.
The median site spacing is 10.6 km
RECON observability=1.0 and success probability=6.8%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Niwot | 06:30:30 | -50.9 | Dark | Up | 17.6 | 293.1 | Really Low | 06:15:30 - 06:45:30 | -2372 |
| Oroville | 06:29:06 | -38.7 | Dark | Up | 30.1 | 280.3 | Up | 06:14:06 - 06:44:06 | -2427 |
| Tonasket | 06:29:08 | -38.9 | Dark | Up | 30.1 | 280.5 | Up | 06:14:08 - 06:44:08 | -2440 |
| Okanogan | 06:29:11 | -39.1 | Dark | Up | 30.1 | 280.6 | Up | 06:14:11 - 06:44:11 | -2464 |
| Brewster | 06:29:12 | -39.3 | Dark | Up | 30.2 | 280.6 | Up | 06:14:12 - 06:44:12 | -2487 |
| Manson/Chelan | 06:29:15 | -39.3 | Dark | Up | 30.4 | 280.5 | Up | 06:14:15 - 06:44:15 | -2513 |
| Entiat | 06:29:17 | -39.5 | Dark | Up | 30.4 | 280.6 | Up | 06:14:17 - 06:44:17 | -2529 |
| Wenatchee | 06:29:19 | -39.6 | Dark | Up | 30.4 | 280.7 | Up | 06:14:19 - 06:44:19 | -2547 |
| Pasco | 06:29:32 | -41.1 | Dark | Up | 29.3 | 282.1 | Low | 06:14:32 - 06:44:32 | -2569 |
| PNWRO | 06:29:36 | -41.4 | Dark | Up | 29.1 | 282.4 | Low | 06:14:36 - 06:44:36 | -2575 |
| Ellensburg | 06:29:23 | -39.9 | Dark | Up | 30.4 | 280.8 | Up | 06:14:23 - 06:44:23 | -2580 |
| George/Umatilla | 06:29:36 | -41.3 | Dark | Up | 29.4 | 282.2 | Low | 06:14:36 - 06:44:36 | -2598 |
| Yakima | 06:29:27 | -40.3 | Dark | Up | 30.4 | 281.0 | Up | 06:14:27 - 06:44:27 | -2605 |
| Toppenish/White Swan | 06:29:30 | -40.5 | Dark | Up | 30.2 | 281.2 | Up | 06:14:30 - 06:44:30 | -2611 |
| Goldendale | 06:29:34 | -40.8 | Dark | Up | 30.4 | 281.3 | Up | 06:14:34 - 06:44:34 | -2661 |
| The Dalles | 06:29:36 | -40.8 | Dark | Up | 30.6 | 281.2 | Up | 06:14:36 - 06:44:36 | -2690 |
| Maupin | 06:29:40 | -41.2 | Dark | Up | 30.4 | 281.5 | Up | 06:14:40 - 06:44:40 | -2711 |
| Madras/Culver | 06:29:44 | -41.7 | Dark | Up | 30.3 | 281.8 | Up | 06:14:44 - 06:44:44 | -2747 |
| Redmond | 06:29:48 | -41.9 | Dark | Up | 30.3 | 282.0 | Up | 06:14:48 - 06:44:48 | -2771 |
| Sisters | 06:29:47 | -41.7 | Dark | Up | 30.6 | 281.7 | Up | 06:14:47 - 06:44:47 | -2786 |
| Bend | 06:29:49 | -42.1 | Dark | Up | 30.3 | 282.0 | Up | 06:14:49 - 06:44:49 | -2790 |
| Oregon Observatory | 06:29:50 | -42.1 | Dark | Up | 30.4 | 282.1 | Up | 06:14:50 - 06:44:50 | -2806 |
| La Pine/Gilchrist | 06:29:53 | -42.3 | Dark | Up | 30.4 | 282.1 | Up | 06:14:53 - 06:44:53 | -2822 |
| North Lake | 06:29:58 | -42.9 | Dark | Up | 29.8 | 282.8 | Low | 06:14:58 - 06:44:58 | -2825 |
| Paisley | 06:30:03 | -43.5 | Dark | Up | 29.4 | 283.3 | Low | 06:15:03 - 06:45:03 | -2845 |
| Lakeview | 06:30:08 | -44.0 | Dark | Up | 29.2 | 283.7 | Low | 06:15:08 - 06:45:08 | -2870 |
| Cedarville | 06:30:15 | -44.6 | Dark | Up | 28.9 | 284.2 | Low | 06:15:15 - 06:45:15 | -2905 |
| Chiloquin | 06:30:02 | -43.0 | Dark | Up | 30.4 | 282.6 | Up | 06:15:02 - 06:45:02 | -2909 |
| Klamath Falls | 06:30:06 | -43.3 | Dark | Up | 30.2 | 282.8 | Up | 06:15:06 - 06:45:06 | -2928 |
| Tulelake | 06:30:09 | -43.7 | Dark | Up | 29.9 | 283.2 | Low | 06:15:09 - 06:45:09 | -2933 |
| Fall River/Burney | 06:30:17 | -44.5 | Dark | Up | 29.6 | 283.7 | Low | 06:15:17 - 06:45:17 | -2990 |
| Susanville | 06:30:25 | -45.3 | Dark | Up | 28.9 | 284.5 | Low | 06:15:25 - 06:45:25 | -3000 |
| Tonopah | 06:30:50 | -48.8 | Dark | Up | 25.6 | 287.5 | Low | 06:15:50 - 06:45:50 | -3009 |
| Reno | 06:30:33 | -46.4 | Dark | Up | 28.0 | 285.4 | Low | 06:15:33 - 06:45:33 | -3022 |
| DCO | 06:31:17 | -53.1 | Dark | Up | 21.5 | 290.8 | Low | 06:16:17 - 06:46:17 | -3029 |
| Yerington | 06:30:39 | -47.2 | Dark | Up | 27.4 | 286.1 | Low | 06:15:39 - 06:45:39 | -3031 |
| Greenville | 06:30:27 | -45.4 | Dark | Up | 29.0 | 284.5 | Low | 06:15:27 - 06:45:27 | -3031 |
| Portola | 06:30:30 | -45.9 | Dark | Up | 28.6 | 284.9 | Low | 06:15:30 - 06:45:30 | -3033 |
| Hawthorne | 06:30:43 | -47.8 | Dark | Up | 26.8 | 286.6 | Low | 06:15:43 - 06:45:43 | -3039 |
| Patrick | 06:31:13 | -52.6 | Dark | Up | 22.1 | 290.3 | Low | 06:16:13 - 06:46:13 | -3040 |
| Indian Springs | 06:31:03 | -50.8 | Dark | Up | 23.9 | 289.0 | Low | 06:16:03 - 06:46:03 | -3042 |
| Quincy | 06:30:28 | -45.6 | Dark | Up | 29.0 | 284.6 | Low | 06:15:28 - 06:45:28 | -3045 |
| Carson City | 06:30:36 | -46.7 | Dark | Up | 27.9 | 285.6 | Low | 06:15:36 - 06:45:36 | -3046 |
| Henderson | 06:31:07 | -51.5 | Dark | Up | 23.2 | 289.5 | Low | 06:16:07 - 06:46:07 | -3048 |
| Gardnerville | 06:30:38 | -46.9 | Dark | Up | 27.8 | 285.8 | Low | 06:15:38 - 06:45:38 | -3060 |
| Kingman/Dolan Springs | 06:31:16 | -52.7 | Dark | Up | 22.2 | 290.3 | Low | 06:16:16 - 06:46:16 | -3064 |
| Beatty | 06:30:59 | -50.0 | Dark | Up | 24.9 | 288.3 | Low | 06:15:59 - 06:45:59 | -3068 |
| Searchlight/Boulder City | 06:31:13 | -52.1 | Dark | Up | 23.0 | 289.8 | Low | 06:16:13 - 06:46:13 | -3084 |
| Laughlin/Bullhead City | 06:31:15 | -52.5 | Dark | Up | 22.6 | 290.1 | Low | 06:16:15 - 06:46:15 | -3090 |
| Lee Vining | 06:30:47 | -48.0 | Dark | Up | 27.0 | 286.6 | Low | 06:15:47 - 06:45:47 | -3099 |
| Mohave Valley | 06:31:17 | -52.7 | Dark | Up | 22.5 | 290.2 | Low | 06:16:17 - 06:46:17 | -3108 |
| Bishop | 06:30:53 | -48.9 | Dark | Up | 26.3 | 287.3 | Low | 06:15:53 - 06:45:53 | -3109 |
| Lake Havasu City | 06:31:20 | -53.2 | Dark | Up | 22.1 | 290.5 | Low | 06:16:20 - 06:46:20 | -3125 |
| Lone Pine | 06:31:00 | -49.7 | Dark | Up | 25.8 | 287.8 | Low | 06:16:00 - 06:46:00 | -3147 |
| Parker | 06:31:24 | -53.5 | Dark | Up | 22.0 | 290.6 | Low | 06:16:24 - 06:46:24 | -3149 |
| Blythe | 06:31:28 | -53.8 | Dark | Up | 22.0 | 290.7 | Low | 06:16:28 - 06:46:28 | -3199 |
| Yuma | 06:31:34 | -54.6 | Dark | Up | 21.7 | 291.0 | Low | 06:16:34 - 06:46:34 | -3268 |
| Calipatria | 06:31:31 | -53.8 | Dark | Up | 22.6 | 290.5 | Low | 06:16:31 - 06:46:31 | -3278 |
| Idyllwild | 06:31:26 | -52.7 | Dark | Up | 23.7 | 289.7 | Low | 06:16:26 - 06:46:26 | -3288 |
| Wildwood | 06:31:21 | -51.4 | Dark | Up | 25.3 | 288.7 | Low | 06:16:21 - 06:46:21 | -3351 |
| CPSLO | 06:31:09 | -49.4 | Dark | Up | 27.4 | 287.2 | Low | 06:16:09 - 06:46:09 | -3358 |
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, (2017/03/15 06:23UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:30 0.8 13.37 136 3Iot Aur 04:56:59.6 +33:09:58 2.7 4.49 127 PPM 093846 04:52:47.2 +27:53:51 6.2 1.72 130 PPM 093934 04:58:46.3 +29:50:37 7.9 1.15 128 PPM 093962 05:00:34.0 +29:11:46 10.0 0.52 128 PPM 093933 04:58:45.8 +28:47:21 10.4 0.21 128 98WS31 04:59:39.9 +28:42:43 15.9 128 Positions are for J2000
Event circumstances last updated at 2016/10/07 18:05:27 UT
Marc W. Buie, Southwest Research Institute