Event between (129772) 99HR11 and star UC4-400-056810 with event index number of 57908
Geocentric closest approach at 2016/05/09 08:14:32 UTC
J2000 position of star is 14:06:07.8 -10:01:01
Equinox of date position of star is 14:06:59.6 -10:05:37
Stellar brightness R=14.0
Star is 128 degrees from the moon.
Moon is 9% illuminated.
TNO apparent brightness V=23.5
[RECON map]
TNO is 42.2 AU from the Sun
and 41.2 AU from the Earth.
The TNO is moving 23.8
km/sec on the sky relative to the star, or,
2.9 arcsec/hr.
The 1-sigma error in the time of the event is 277 seconds.
The 1-sigma cross-track error in the shadow position is
3963 km.
The TNO has an absolute magnitude Hv=7.2
Diameter=218.8 km assuming a 5% albedo -- 9.2 sec chord
Diameter=89.3 km assuming a 30% albedo -- 3.8 sec chord
Dynamical classification is CLASSICAL
Star training set for 129772, (2016/05/09 08:15UT) Object RA Dec mag sep mel Spica 13:26:03.4 -11:14:46 1.0 10.12 119 95 Vir 14:07:34.9 -09:23:27 5.3 0.72 128 PPM 228321 14:08:21.4 -10:24:03 8.1 0.45 129 PPM 228300 14:07:26.5 -10:10:26 8.9 0.13 129 129772 14:07:00.1 -10:05:40 14.0 129 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 12.4 km
RECON observability=1.0 and success probability=5.6%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Oroville | 08:14:45 | -23.4 | Dark | Down | 28.4 | 202.8 | Low | 07:51:09 - 08:38:22 | 2662 |
| Tonasket | 08:14:44 | -23.6 | Dark | Down | 28.6 | 202.9 | Low | 07:51:08 - 08:38:21 | 2652 |
| Okanogan | 08:14:45 | -24.0 | Dark | Down | 29.0 | 202.8 | Low | 07:51:08 - 08:38:21 | 2633 |
| Brewster | 08:14:44 | -24.3 | Dark | Down | 29.3 | 202.6 | Low | 07:51:08 - 08:38:21 | 2617 |
| Manson/Chelan | 08:14:46 | -24.5 | Dark | Down | 29.6 | 202.3 | Low | 07:51:09 - 08:38:22 | 2600 |
| Entiat | 08:14:46 | -24.7 | Dark | Down | 29.8 | 202.3 | Low | 07:51:09 - 08:38:22 | 2588 |
| Wenatchee | 08:14:45 | -25.0 | Dark | Down | 30.0 | 202.2 | Up | 07:51:08 - 08:38:21 | 2574 |
| Ellensburg | 08:14:44 | -25.4 | Dark | Down | 30.5 | 202.1 | Up | 07:51:08 - 08:38:21 | 2550 |
| Yakima | 08:14:44 | -25.8 | Dark | Down | 30.9 | 202.1 | Up | 07:51:08 - 08:38:21 | 2529 |
| Toppenish/White Swan | 08:14:44 | -26.0 | Dark | Down | 31.0 | 202.4 | Up | 07:51:07 - 08:38:20 | 2521 |
| Pasco | 08:14:39 | -26.1 | Dark | Down | 30.8 | 203.8 | Up | 07:51:02 - 08:38:15 | 2539 |
| PNWRO | 08:14:38 | -26.3 | Dark | Down | 30.9 | 204.1 | Up | 07:51:01 - 08:38:14 | 2531 |
| George/Umatilla | 08:14:39 | -26.4 | Dark | Down | 31.2 | 203.6 | Up | 07:51:03 - 08:38:16 | 2517 |
| Goldendale | 08:14:44 | -26.6 | Dark | Down | 31.6 | 202.0 | Up | 07:51:07 - 08:38:20 | 2485 |
| The Dalles | 08:14:44 | -26.8 | Dark | Down | 31.9 | 201.7 | Up | 07:51:08 - 08:38:21 | 2466 |
| Maupin | 08:14:44 | -27.2 | Dark | Down | 32.3 | 201.9 | Up | 07:51:07 - 08:38:20 | 2446 |
| Madras/Culver | 08:14:42 | -27.8 | Dark | Down | 32.8 | 201.9 | Up | 07:51:06 - 08:38:19 | 2417 |
| Sisters | 08:14:44 | -28.1 | Dark | Down | 33.2 | 201.5 | Up | 07:51:07 - 08:38:20 | 2390 |
| Redmond | 08:14:42 | -28.1 | Dark | Down | 33.2 | 202.0 | Up | 07:51:05 - 08:38:18 | 2397 |
| Bend | 08:14:41 | -28.4 | Dark | Down | 33.4 | 201.9 | Up | 07:51:05 - 08:38:18 | 2383 |
| Oregon Observatory | 08:14:42 | -28.5 | Dark | Down | 33.6 | 201.8 | Up | 07:51:06 - 08:38:19 | 2370 |
| LaPine/Gilchrist | 08:14:41 | -28.8 | Dark | Down | 33.8 | 201.7 | Up | 07:51:05 - 08:38:18 | 2358 |
| North Lake | 08:14:39 | -29.2 | Dark | Down | 34.0 | 202.5 | Up | 07:51:03 - 08:38:16 | 2346 |
| Paisley | 08:14:36 | -29.7 | Dark | Down | 34.5 | 203.1 | Up | 07:51:00 - 08:38:13 | 2322 |
| Chiloquin | 08:14:41 | -29.9 | Dark | Down | 34.9 | 201.6 | Up | 07:51:05 - 08:38:18 | 2288 |
| Klamath Falls | 08:14:40 | -30.2 | Dark | Down | 35.2 | 201.8 | Up | 07:51:03 - 08:38:16 | 2270 |
| Lakeview | 08:14:36 | -30.2 | Dark | Down | 34.9 | 203.4 | Up | 07:50:59 - 08:38:12 | 2297 |
| Tulelake | 08:14:38 | -30.5 | Dark | Down | 35.4 | 202.2 | Up | 07:51:02 - 08:38:15 | 2261 |
| Cedarville | 08:14:34 | -30.8 | Dark | Down | 35.4 | 203.8 | Up | 07:50:58 - 08:38:11 | 2262 |
| Fall River/Burney | 08:14:37 | -31.4 | Dark | Down | 36.2 | 202.5 | Up | 07:51:00 - 08:38:13 | 2208 |
| Susanville | 08:14:34 | -32.0 | Dark | Down | 36.6 | 203.6 | Up | 07:50:57 - 08:38:10 | 2186 |
| Greenville | 08:14:34 | -32.3 | Dark | Down | 36.9 | 203.3 | Up | 07:50:57 - 08:38:10 | 2163 |
| Niwot | 08:13:45 | -29.7 | Dark | Down | 30.7 | 220.2 | Up | 07:50:09 - 08:37:22 | 2440 |
| Quincy | 08:14:34 | -32.5 | Dark | Down | 37.1 | 203.4 | Up | 07:50:57 - 08:38:10 | 2151 |
| Portola | 08:14:33 | -32.6 | Dark | Down | 37.1 | 204.0 | Up | 07:50:56 - 08:38:09 | 2154 |
| Reno | 08:14:29 | -32.8 | Dark | Down | 37.1 | 204.8 | Up | 07:50:52 - 08:38:05 | 2151 |
| Carson City | 08:14:29 | -33.1 | Dark | Down | 37.4 | 204.9 | Up | 07:50:52 - 08:38:05 | 2129 |
| Yerington | 08:14:26 | -33.3 | Dark | Down | 37.4 | 205.7 | Up | 07:50:49 - 08:38:02 | 2130 |
| Gardnerville | 08:14:28 | -33.4 | Dark | Down | 37.6 | 205.1 | Up | 07:50:52 - 08:38:05 | 2115 |
| Hawthorne | 08:14:24 | -33.7 | Dark | Down | 37.6 | 206.5 | Up | 07:50:47 - 08:38:00 | 2112 |
| Lee Vining | 08:14:24 | -34.3 | Dark | Down | 38.3 | 206.1 | Up | 07:50:47 - 08:38:00 | 2066 |
| Tonopah | 08:14:18 | -34.0 | Dark | Down | 37.6 | 208.3 | Up | 07:50:41 - 08:37:54 | 2111 |
| Bishop | 08:14:20 | -34.8 | Dark | Down | 38.6 | 207.2 | Up | 07:50:43 - 08:37:56 | 2043 |
| Lone Pine | 08:14:17 | -35.6 | Dark | Down | 39.2 | 207.8 | Up | 07:50:41 - 08:37:54 | 2000 |
| Beatty | 08:14:14 | -35.1 | Dark | Down | 38.4 | 209.2 | Up | 07:50:37 - 08:37:50 | 2046 |
| Indian Springs | 08:14:09 | -35.3 | Dark | Down | 38.3 | 210.6 | Up | 07:50:33 - 08:37:46 | 2046 |
| Henderson | 08:14:06 | -35.7 | Dark | Down | 38.4 | 211.5 | Up | 07:50:29 - 08:37:42 | 2025 |
| Searchlight/Boulder City | 08:14:04 | -36.3 | Dark | Down | 38.9 | 211.8 | Up | 07:50:27 - 08:37:40 | 1988 |
| CPSLO | 08:14:24 | -37.1 | Dark | Down | 41.3 | 205.2 | Up | 07:50:47 - 08:38:00 | 1857 |
| Kingman/Dolan Springs | 08:14:01 | -36.4 | Dark | Down | 38.8 | 212.9 | Up | 07:50:24 - 08:37:37 | 1987 |
| Laughlin/Bullhead City | 08:14:03 | -36.5 | Dark | Down | 39.0 | 212.4 | Up | 07:50:26 - 08:37:39 | 1975 |
| DCO | 08:13:58 | -36.3 | Dark | Down | 38.4 | 214.0 | Up | 07:50:21 - 08:37:34 | 1999 |
| Mohave Valley | 08:14:03 | -36.8 | Dark | Down | 39.2 | 212.5 | Up | 07:50:26 - 08:37:39 | 1957 |
| Lake Havasu City | 08:14:00 | -37.1 | Dark | Down | 39.5 | 212.9 | Up | 07:50:24 - 08:37:37 | 1935 |
| Parker | 08:14:00 | -37.5 | Dark | Down | 39.8 | 213.1 | Up | 07:50:23 - 08:37:36 | 1911 |
| Idyllwild | 08:14:07 | -38.2 | Dark | Down | 41.1 | 210.5 | Up | 07:50:31 - 08:37:44 | 1835 |
| Blythe | 08:14:00 | -38.0 | Dark | Down | 40.3 | 213.0 | Up | 07:50:23 - 08:37:36 | 1869 |
| Calipatria | 08:14:01 | -38.7 | Dark | Down | 41.2 | 212.2 | Up | 07:50:25 - 08:37:38 | 1816 |
| Yuma | 08:13:58 | -38.9 | Dark | Down | 41.1 | 213.4 | Up | 07:50:22 - 08:37:35 | 1804 |
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.
Event circumstances last updated at 2016/03/16 17:03:15 UT
Marc W. Buie, Southwest Research Institute