Event between (79978) 99CC158 and star TYC20840-01382-1 with event index number of 101266
Geocentric closest approach at 2018/01/11 13:17:29 UTC
J2000 position of star is 10:21:08.3 +12:10:34
Equinox of date position of star is 10:22:03.6 +12:05:19
Stellar brightness V=12.0,
use SENSEUP=16
Star is 78 degrees from the moon.
Moon is 25% illuminated.
TNO apparent brightness V=22.4
[RECON map]
TNO is 46.1 AU from the Sun
and 45.4 AU from the Earth.
The TNO is moving 18.3
km/sec on the sky relative to the star, or,
2.0 arcsec/hr.
The 1-sigma error in the time of the event is 266 seconds.
The 1-sigma cross-track error in the shadow position is
4164 km.
The sky-plane scale is
32918.7 km/arcsec.
The TNO has an absolute magnitude Hv=5.7
Diameter=436.5 km assuming a 5% albedo -- 23.9 sec chord
Diameter=178.2 km assuming a 30% albedo -- 9.7 sec chord
Dynamical classification is 12:5EEEEEEE
Star training set for 79978, (2018/01/11 13:17UT) Object RA Dec mag sep mel Regulus 10:09:19.8 +11:52:42 1.3 3.13 81 37 Leo 10:17:38.7 +13:38:16 5.4 1.89 80 PPM 127289 10:19:18.7 +12:31:48 7.6 0.81 79 PPM 127340 10:23:00.8 +12:20:12 9.3 0.34 78 PPM 127334 10:22:42.0 +11:53:14 11.0 0.25 78 79978 10:22:05.9 +12:05:06 12.0 78 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
3.4 sigma about the mid-time.
The median site spacing is 15.3 km
RECON observability=1.0 and success probability=1.7%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Oroville | 13:16:27 | -24.2 | Dark | Up | 43.0 | 230.8 | Up | 13:01:27 - 13:31:27 | 11284 |
| Tonasket | 13:16:26 | -24.1 | Dark | Up | 43.2 | 230.9 | Up | 13:01:26 - 13:31:26 | 11269 |
| Okanogan | 13:16:28 | -24.2 | Dark | Up | 43.5 | 231.0 | Up | 13:01:28 - 13:31:28 | 11242 |
| Brewster | 13:16:25 | -24.3 | Dark | Up | 43.8 | 231.0 | Up | 13:01:25 - 13:31:25 | 11218 |
| Manson/Chelan | 13:16:28 | -24.5 | Dark | Up | 44.1 | 230.7 | Up | 13:01:28 - 13:31:28 | 11194 |
| Entiat | 13:16:24 | -24.6 | Dark | Up | 44.3 | 230.8 | Up | 13:01:24 - 13:31:24 | 11177 |
| Wenatchee | 13:16:23 | -24.6 | Dark | Up | 44.5 | 230.9 | Up | 13:01:23 - 13:31:23 | 11157 |
| Ellensburg | 13:16:24 | -24.7 | Dark | Up | 44.8 | 230.9 | Up | 13:01:24 - 13:31:24 | 11122 |
| Pasco | 13:16:16 | -23.7 | Dark | Up | 44.6 | 233.1 | Up | 13:01:16 - 13:31:16 | 11111 |
| PNWRO | 13:16:14 | -23.5 | Dark | Up | 44.6 | 233.5 | Up | 13:01:14 - 13:31:14 | 11100 |
| Yakima | 13:16:21 | -24.7 | Dark | Up | 45.1 | 231.2 | Up | 13:01:21 - 13:31:21 | 11093 |
| Niwot | 13:15:10 | -12.6 | AT | Up | 38.5 | 251.4 | Up | 13:00:10 - 13:30:10 | 11093 |
| Toppenish/White Swan | 13:16:20 | -24.6 | Dark | Up | 45.2 | 231.6 | Up | 13:01:20 - 13:31:20 | 11083 |
| George/Umatilla | 13:16:16 | -23.8 | Dark | Up | 44.9 | 233.1 | Up | 13:01:16 - 13:31:16 | 11081 |
| Goldendale | 13:16:19 | -24.8 | Dark | Up | 45.7 | 231.5 | Up | 13:01:19 - 13:31:19 | 11032 |
| The Dalles | 13:16:19 | -25.0 | Dark | Up | 46.1 | 231.3 | Up | 13:01:19 - 13:31:19 | 11005 |
| Maupin | 13:16:17 | -24.9 | Dark | Up | 46.3 | 231.7 | Up | 13:01:17 - 13:31:17 | 10978 |
| Madras/Culver | 13:16:17 | -24.9 | Dark | Up | 46.6 | 232.1 | Up | 13:01:17 - 13:31:17 | 10937 |
| Redmond | 13:16:14 | -24.9 | Dark | Up | 46.9 | 232.3 | Up | 13:01:14 - 13:31:14 | 10910 |
| Sisters | 13:16:16 | -25.2 | Dark | Up | 47.1 | 231.9 | Up | 13:01:16 - 13:31:16 | 10900 |
| Bend | 13:16:14 | -25.0 | Dark | Up | 47.1 | 232.4 | Up | 13:01:14 - 13:31:14 | 10890 |
| Oregon Observatory | 13:16:14 | -25.0 | Dark | Up | 47.3 | 232.4 | Up | 13:01:14 - 13:31:14 | 10873 |
| La Pine/Gilchrist | 13:16:13 | -25.0 | Dark | Up | 47.5 | 232.5 | Up | 13:01:13 - 13:31:13 | 10857 |
| North Lake | 13:16:10 | -24.6 | Dark | Up | 47.4 | 233.5 | Up | 13:01:10 - 13:31:10 | 10842 |
| Paisley | 13:16:07 | -24.2 | Dark | Up | 47.5 | 234.4 | Up | 13:01:07 - 13:31:07 | 10812 |
| Lakeview | 13:16:04 | -24.0 | Dark | Up | 47.7 | 235.1 | Up | 13:01:04 - 13:31:04 | 10780 |
| Chiloquin | 13:16:10 | -25.2 | Dark | Up | 48.3 | 233.0 | Up | 13:01:10 - 13:31:10 | 10762 |
| Klamath Falls | 13:16:08 | -25.1 | Dark | Up | 48.5 | 233.4 | Up | 13:01:08 - 13:31:08 | 10739 |
| Cedarville | 13:16:01 | -23.8 | Dark | Up | 48.0 | 235.9 | Up | 13:01:01 - 13:31:01 | 10735 |
| Tulelake | 13:16:06 | -24.8 | Dark | Up | 48.5 | 234.0 | Up | 13:01:06 - 13:31:06 | 10727 |
| Fall River/Burney | 13:16:02 | -24.7 | Dark | Up | 49.0 | 234.9 | Up | 13:01:02 - 13:31:02 | 10660 |
| Susanville | 13:16:00 | -24.0 | Dark | Up | 48.9 | 236.3 | Up | 13:01:00 - 13:31:00 | 10634 |
| Gimple | 13:15:57 | -24.1 | Dark | Up | 49.2 | 236.4 | Up | 13:00:57 - 13:30:57 | 10606 |
| Greenville | 13:15:58 | -24.2 | Dark | Up | 49.2 | 236.3 | Up | 13:00:58 - 13:30:58 | 10604 |
| Portola | 13:15:55 | -23.8 | Dark | Up | 49.1 | 237.1 | Up | 13:00:55 - 13:30:55 | 10593 |
| Reno | 13:15:52 | -23.3 | Dark | Up | 48.8 | 238.1 | Up | 13:00:52 - 13:30:52 | 10593 |
| Quincy | 13:15:57 | -24.2 | Dark | Up | 49.3 | 236.5 | Up | 13:00:57 - 13:30:57 | 10588 |
| Yerington | 13:15:48 | -22.7 | Dark | Up | 48.7 | 239.3 | Up | 13:00:48 - 13:30:48 | 10570 |
| Carson City | 13:15:50 | -23.2 | Dark | Up | 49.0 | 238.4 | Up | 13:00:50 - 13:30:50 | 10565 |
| Tonopah | 13:15:37 | -21.0 | Dark | Up | 47.9 | 242.2 | Up | 13:00:37 - 13:30:37 | 10560 |
| Hawthorne | 13:15:43 | -22.2 | Dark | Up | 48.6 | 240.3 | Up | 13:00:43 - 13:30:43 | 10551 |
| Gardnerville | 13:15:49 | -23.1 | Dark | Up | 49.1 | 238.7 | Up | 13:00:49 - 13:30:49 | 10548 |
| Indian Springs | 13:15:26 | -19.6 | Dark | Up | 47.4 | 245.2 | Up | 13:00:26 - 13:30:26 | 10491 |
| Lee Vining | 13:15:43 | -22.5 | Dark | Up | 49.2 | 240.4 | Up | 13:00:43 - 13:30:43 | 10490 |
| Beatty | 13:15:32 | -20.5 | Dark | Up | 48.1 | 243.8 | Up | 13:00:32 - 13:30:32 | 10482 |
| Henderson | 13:15:22 | -18.9 | Dark | Up | 47.2 | 246.3 | Up | 13:00:22 - 13:30:22 | 10471 |
| Bishop | 13:15:38 | -21.8 | Dark | Up | 49.0 | 241.7 | Up | 13:00:38 - 13:30:38 | 10466 |
| Patrick | 13:15:15 | -17.9 | AT | Up | 46.6 | 248.0 | Up | 13:00:15 - 13:30:15 | 10458 |
| DCO | 13:15:12 | -17.3 | AT | Up | 46.2 | 248.9 | Up | 13:00:12 - 13:30:12 | 10457 |
| Kingman/Dolan Springs | 13:15:15 | -18.0 | AT | Up | 46.8 | 248.0 | Up | 13:00:15 - 13:30:15 | 10434 |
| Searchlight/Boulder City | 13:15:19 | -18.7 | Dark | Up | 47.4 | 247.0 | Up | 13:00:19 - 13:30:19 | 10427 |
| Lone Pine | 13:15:35 | -21.4 | Dark | Up | 49.1 | 242.8 | Up | 13:00:35 - 13:30:35 | 10415 |
| Laughlin/Bullhead City | 13:15:18 | -18.4 | Dark | Up | 47.2 | 247.6 | Up | 13:00:18 - 13:30:18 | 10414 |
| Mohave Valley | 13:15:16 | -18.3 | Dark | Up | 47.3 | 247.9 | Up | 13:00:16 - 13:30:16 | 10392 |
| Lake Havasu City | 13:15:13 | -18.0 | Dark | Up | 47.3 | 248.5 | Up | 13:00:13 - 13:30:13 | 10368 |
| Parker | 13:15:14 | -17.9 | AT | Up | 47.4 | 248.9 | Up | 13:00:14 - 13:30:14 | 10340 |
| Blythe | 13:15:11 | -18.0 | Dark | Up | 47.8 | 249.1 | Up | 13:00:11 - 13:30:11 | 10286 |
| Idyllwild | 13:15:21 | -19.8 | Dark | Up | 49.4 | 247.1 | Up | 13:00:21 - 13:30:21 | 10224 |
| CPSLO | 13:15:39 | -23.2 | Dark | Up | 51.6 | 241.5 | Up | 13:00:39 - 13:30:39 | 10221 |
| Calipatria | 13:15:13 | -18.7 | Dark | Up | 48.7 | 248.8 | Up | 13:00:13 - 13:30:13 | 10213 |
| Yuma | 13:15:09 | -17.8 | AT | Up | 48.2 | 250.0 | Up | 13:00:09 - 13:30:09 | 10208 |
| Wildwood | 13:15:28 | -21.3 | Dark | Up | 50.7 | 244.9 | Up | 13:00:28 - 13:30:28 | 10190 |
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 79978, (2018/01/11 13:17UT) Object RA Dec mag sep mel Regulus 10:08:22.0 +11:58:02 1.3 3.13 81 37 Leo 10:16:40.7 +13:43:42 5.4 1.89 80 PPM 127289 10:18:20.9 +12:37:15 7.6 0.81 79 PPM 127340 10:22:03.2 +12:25:41 9.3 0.34 78 PPM 127334 10:21:44.5 +11:58:43 11.0 0.25 78 79978 10:21:08.3 +12:10:34 12.0 78 Positions are for J2000
Event circumstances last updated at 2017/04/24 16:16:18 UT
Marc W. Buie, Southwest Research Institute