Event between (137295) 99RB216 and star UC4-476-003385 with event index number of 153757
Geocentric closest approach at 2018/10/11 08:50:10 UTC
J2000 position of star is 02:15:56.6 +05:08:45
Equinox of date position of star is 02:16:52.9 +05:13:42
Stellar brightness R=14.1,
use SENSEUP=64
Star is 167 degrees from the moon.
Moon is 6% illuminated.
TNO apparent brightness V=22.7
[RECON map]
TNO is 33.7 AU from the Sun
and 32.8 AU from the Earth.
The TNO is moving 23.2
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 221 seconds.
The 1-sigma cross-track error in the shadow position is
3557 km.
The sky-plane scale is
23780.5 km/arcsec.
The TNO has an absolute magnitude Hv=7.4
Diameter=199.5 km assuming a 5% albedo -- 8.6 sec chord
Diameter=81.5 km assuming a 30% albedo -- 3.5 sec chord
Dynamical classification is 2:1E
Star training set for 137295, (2018/10/11 08:50UT) Object RA Dec mag sep mel Aldebaran 04:37:00.0 +16:32:44 0.8 36.12 157 68Omi Cet 02:20:17.8 -02:53:36 2.0 8.17 162 PPM 145462 02:19:00.1 +01:50:44 5.6 3.43 165 PPM 145443 02:17:25.3 +04:42:45 8.3 0.53 167 PPM 145419 02:15:57.7 +04:57:24 10.0 0.37 167 PPM 145427 02:16:18.0 +05:29:49 10.3 0.31 167 137295 02:16:55.6 +05:13:56 14.1 167 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
4.1 sigma about the mid-time.
The median site spacing is 18.4 km
RECON observability=1.0 and success probability=1.9%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Oroville | 08:48:59 | -46.0 | Dark | Down | 46.2 | 178.2 | Up | 08:33:59 - 09:03:59 | 10431 |
| Tonasket | 08:48:59 | -46.2 | Dark | Down | 46.4 | 178.2 | Up | 08:33:59 - 09:03:59 | 10414 |
| Okanogan | 08:48:59 | -46.5 | Dark | Down | 46.8 | 177.9 | Up | 08:33:59 - 09:03:59 | 10394 |
| Brewster | 08:49:01 | -46.8 | Dark | Down | 47.0 | 177.6 | Up | 08:34:01 - 09:04:01 | 10380 |
| Manson/Chelan | 08:49:02 | -47.1 | Dark | Down | 47.2 | 177.1 | Up | 08:34:02 - 09:04:02 | 10376 |
| Entiat | 08:49:03 | -47.3 | Dark | Down | 47.4 | 177.0 | Up | 08:34:03 - 09:04:03 | 10362 |
| Wenatchee | 08:49:03 | -47.6 | Dark | Down | 47.7 | 176.8 | Up | 08:34:03 - 09:04:03 | 10347 |
| Ellensburg | 08:49:05 | -48.0 | Dark | Down | 48.1 | 176.5 | Up | 08:34:05 - 09:04:05 | 10323 |
| Yakima | 08:49:05 | -48.4 | Dark | Down | 48.5 | 176.4 | Up | 08:34:05 - 09:04:05 | 10293 |
| Toppenish/White Swan | 08:49:05 | -48.6 | Dark | Down | 48.7 | 176.7 | Up | 08:34:05 - 09:04:05 | 10272 |
| Goldendale | 08:49:07 | -49.2 | Dark | Down | 49.3 | 176.0 | Up | 08:34:07 - 09:04:07 | 10244 |
| The Dalles | 08:49:09 | -49.5 | Dark | Down | 49.5 | 175.4 | Up | 08:34:09 - 09:04:09 | 10239 |
| Pasco | 08:49:02 | -48.3 | Dark | Down | 48.9 | 178.6 | Up | 08:34:02 - 09:04:02 | 10222 |
| George/Umatilla | 08:49:03 | -48.7 | Dark | Down | 49.2 | 178.2 | Up | 08:34:03 - 09:04:03 | 10204 |
| Maupin | 08:49:10 | -49.8 | Dark | Down | 49.9 | 175.5 | Up | 08:34:10 - 09:04:10 | 10204 |
| PNWRO | 08:49:01 | -48.5 | Dark | Down | 49.1 | 178.9 | Up | 08:34:01 - 09:04:01 | 10196 |
| Madras/Culver | 08:49:10 | -50.4 | Dark | Down | 50.4 | 175.4 | Up | 08:34:10 - 09:04:10 | 10163 |
| Sisters | 08:49:12 | -50.8 | Dark | Down | 50.7 | 174.7 | Up | 08:34:12 - 09:04:12 | 10152 |
| Redmond | 08:49:11 | -50.7 | Dark | Down | 50.8 | 175.3 | Up | 08:34:11 - 09:04:11 | 10137 |
| Bend | 08:49:12 | -50.9 | Dark | Down | 51.0 | 175.1 | Up | 08:34:12 - 09:04:12 | 10125 |
| Oregon Observatory | 08:49:13 | -51.1 | Dark | Down | 51.2 | 174.9 | Up | 08:34:13 - 09:04:13 | 10116 |
| La Pine/Gilchrist | 08:49:13 | -51.3 | Dark | Down | 51.4 | 174.8 | Up | 08:34:13 - 09:04:13 | 10103 |
| North Lake | 08:49:12 | -51.6 | Dark | Down | 51.8 | 175.7 | Up | 08:34:12 - 09:04:12 | 10049 |
| Chiloquin | 08:49:17 | -52.5 | Dark | Down | 52.4 | 174.1 | Up | 08:34:17 - 09:04:17 | 10028 |
| Klamath Falls | 08:49:17 | -52.8 | Dark | Down | 52.8 | 174.2 | Up | 08:34:17 - 09:04:17 | 9998 |
| Paisley | 08:49:12 | -52.0 | Dark | Down | 52.4 | 176.2 | Up | 08:34:12 - 09:04:12 | 9993 |
| Tulelake | 08:49:17 | -52.9 | Dark | Down | 53.1 | 174.6 | Up | 08:34:17 - 09:04:17 | 9966 |
| Lakeview | 08:49:12 | -52.4 | Dark | Down | 52.9 | 176.5 | Up | 08:34:12 - 09:04:12 | 9946 |
| Fall River/Burney | 08:49:17 | -53.7 | Dark | Down | 54.0 | 174.6 | Up | 08:34:17 - 09:04:17 | 9891 |
| Cedarville | 08:49:13 | -52.9 | Dark | Down | 53.6 | 176.7 | Up | 08:34:13 - 09:04:13 | 9888 |
| Susanville | 08:49:16 | -54.1 | Dark | Down | 54.7 | 175.8 | Up | 08:34:16 - 09:04:16 | 9814 |
| Greenville | 08:49:17 | -54.4 | Dark | Down | 54.9 | 175.3 | Up | 08:34:17 - 09:04:17 | 9802 |
| Gimple | 08:49:17 | -54.4 | Dark | Down | 54.9 | 175.4 | Up | 08:34:17 - 09:04:17 | 9799 |
| Quincy | 08:49:18 | -54.6 | Dark | Down | 55.1 | 175.3 | Up | 08:34:18 - 09:04:18 | 9785 |
| Portola | 08:49:17 | -54.5 | Dark | Down | 55.3 | 176.1 | Up | 08:34:17 - 09:04:17 | 9758 |
| Reno | 08:49:15 | -54.5 | Dark | Down | 55.6 | 177.2 | Up | 08:34:15 - 09:04:15 | 9713 |
| Carson City | 08:49:15 | -54.9 | Dark | Down | 55.9 | 177.2 | Up | 08:34:15 - 09:04:15 | 9683 |
| Gardnerville | 08:49:16 | -55.0 | Dark | Down | 56.2 | 177.3 | Up | 08:34:16 - 09:04:16 | 9661 |
| Yerington | 08:49:14 | -54.8 | Dark | Down | 56.1 | 178.3 | Up | 08:34:14 - 09:04:14 | 9644 |
| Hawthorne | 08:49:13 | -55.0 | Dark | Down | 56.6 | 179.3 | Up | 08:34:13 - 09:04:13 | 9586 |
| Lee Vining | 08:49:15 | -55.7 | Dark | Down | 57.2 | 178.4 | Up | 08:34:15 - 09:04:15 | 9556 |
| Tonopah | 08:49:09 | -54.8 | Dark | Down | 57.1 | 181.8 | Up | 08:34:09 - 09:04:09 | 9495 |
| Bishop | 08:49:14 | -55.9 | Dark | Down | 57.8 | 179.7 | Up | 08:34:14 - 09:04:14 | 9479 |
| Lone Pine | 08:49:14 | -56.4 | Dark | Down | 58.5 | 180.3 | Up | 08:34:14 - 09:04:14 | 9401 |
| CPSLO | 08:49:25 | -58.6 | Dark | Down | 59.8 | 175.3 | Up | 08:34:25 - 09:04:25 | 9385 |
| Beatty | 08:49:09 | -55.6 | Dark | Down | 58.2 | 182.7 | Up | 08:34:09 - 09:04:09 | 9379 |
| Indian Springs | 08:49:06 | -55.3 | Dark | Down | 58.5 | 184.8 | Up | 08:34:06 - 09:04:06 | 9312 |
| Niwot | 08:48:26 | -47.3 | Dark | Down | 53.2 | 201.7 | Up | 08:33:26 - 09:03:26 | 9262 |
| Henderson | 08:49:04 | -55.4 | Dark | Down | 59.0 | 186.2 | Up | 08:34:04 - 09:04:04 | 9239 |
| Wildwood | 08:49:20 | -58.7 | Dark | Down | 61.1 | 179.3 | Up | 08:34:20 - 09:04:20 | 9202 |
| Searchlight/Boulder City | 08:49:05 | -55.9 | Dark | Down | 59.5 | 186.4 | Up | 08:34:05 - 09:04:05 | 9186 |
| Laughlin/Bullhead City | 08:49:04 | -55.9 | Dark | Down | 59.8 | 187.2 | Up | 08:34:04 - 09:04:04 | 9147 |
| Patrick | 08:49:01 | -55.4 | Dark | Down | 59.5 | 188.5 | Up | 08:34:01 - 09:04:01 | 9143 |
| Kingman/Dolan Springs | 08:49:02 | -55.6 | Dark | Down | 59.7 | 188.2 | Up | 08:34:02 - 09:04:02 | 9130 |
| Mohave Valley | 08:49:04 | -56.1 | Dark | Down | 60.1 | 187.2 | Up | 08:34:04 - 09:04:04 | 9122 |
| Idyllwild | 08:49:14 | -58.1 | Dark | Down | 61.4 | 183.1 | Up | 08:34:14 - 09:04:14 | 9098 |
| DCO | 08:48:59 | -55.2 | Dark | Down | 59.7 | 189.9 | Up | 08:33:59 - 09:03:59 | 9089 |
| Lake Havasu City | 08:49:04 | -56.3 | Dark | Down | 60.4 | 187.8 | Up | 08:34:04 - 09:04:04 | 9077 |
| Parker | 08:49:05 | -56.5 | Dark | Down | 60.8 | 188.0 | Up | 08:34:05 - 09:04:05 | 9044 |
| Blythe | 08:49:07 | -57.1 | Dark | Down | 61.3 | 187.5 | Up | 08:34:07 - 09:04:07 | 9008 |
| Calipatria | 08:49:10 | -58.0 | Dark | Down | 61.9 | 185.7 | Up | 08:34:10 - 09:04:10 | 8999 |
| Yuma | 08:49:08 | -57.8 | Dark | Down | 62.3 | 187.7 | Up | 08:34:08 - 09:04:08 | 8926 |
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 137295, (2018/10/11 08:50UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:30 0.8 36.12 157 68Omi Cet 02:19:20.8 -02:58:44 2.0 8.17 162 PPM 145462 02:18:01.9 +01:45:35 5.6 3.43 165 PPM 145443 02:16:26.4 +04:37:34 8.3 0.53 167 PPM 145419 02:14:58.8 +04:52:11 10.0 0.37 167 PPM 145427 02:15:18.9 +05:24:37 10.3 0.31 167 137295 02:15:56.6 +05:08:45 14.1 167 Positions are for J2000
Event circumstances last updated at 2017/12/05 18:59:23 UT
Marc W. Buie, Southwest Research Institute