Event between (50000) Quaoar and star UC4-373-116977 with event index number of 110296
Geocentric closest approach at 2018/03/16 11:16:18 UTC
J2000 position of star is 18:07:17.1 -15:32:31
Equinox of date position of star is 18:08:18.9 -15:32:19
Stellar brightness R=16.3,
use SENSEUP=128
Star is 72 degrees from the moon.
Moon is 1% illuminated.
TNO apparent brightness V=18.9
[RECON map]
TNO is 42.9 AU from the Sun
and 43.0 AU from the Earth.
The TNO is moving 9.3
km/sec on the sky relative to the star, or,
1.1 arcsec/hr.
The 1-sigma error in the time of the event is 238 seconds.
The 1-sigma cross-track error in the shadow position is
1921 km.
The sky-plane scale is
31181.6 km/arcsec.
The TNO has an absolute magnitude Hv=2.4
Diameter=1995.3 km assuming a 5% albedo -- 215.1 sec chord
Diameter=814.6 km assuming a 30% albedo -- 87.8 sec chord
Dynamical classification is CLASSICAL
Star training set for 50000, (2018/03/16 11:16UT) Object RA Dec mag sep mel Antares 16:30:31.6 -26:28:15 0.9 25.24 93 35Eta Oph 17:11:25.4 -15:44:46 2.6 13.70 85 PPM 234067 18:08:51.7 -17:09:01 5.3 1.62 72 PPM 234043 18:07:36.8 -14:58:12 8.2 0.59 72 PPM 234061 18:08:19.0 -15:33:11 9.5 0.01 72 50000 18:08:19.8 -15:32:19 16.3 72 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
3.8 sigma about the mid-time.
The median site spacing is 12.8 km
RECON observability=0.3 and success probability=2.0%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Oroville | 11:15:57 | -27.8 | Dark | Down | 12.7 | 132.5 | Really Low | 11:00:57 - 11:30:57 | 3780 |
| Tonasket | 11:15:57 | -27.9 | Dark | Down | 12.8 | 132.5 | Really Low | 11:00:57 - 11:30:57 | 3776 |
| Okanogan | 11:15:57 | -28.2 | Dark | Down | 13.0 | 132.3 | Really Low | 11:00:57 - 11:30:57 | 3772 |
| Manson/Chelan | 11:15:57 | -28.8 | Dark | Down | 13.0 | 131.7 | Really Low | 11:00:57 - 11:30:57 | 3771 |
| Brewster | 11:15:57 | -28.5 | Dark | Down | 13.1 | 132.1 | Really Low | 11:00:57 - 11:30:57 | 3770 |
| Entiat | 11:15:57 | -28.9 | Dark | Down | 13.1 | 131.6 | Really Low | 11:00:57 - 11:30:57 | 3768 |
| Wenatchee | 11:15:57 | -29.1 | Dark | Down | 13.2 | 131.5 | Really Low | 11:00:57 - 11:30:57 | 3765 |
| Ellensburg | 11:15:57 | -29.5 | Dark | Down | 13.4 | 131.3 | Really Low | 11:00:57 - 11:30:57 | 3761 |
| Yakima | 11:15:57 | -29.7 | Dark | Down | 13.7 | 131.2 | Really Low | 11:00:57 - 11:30:57 | 3755 |
| Toppenish/White Swan | 11:15:57 | -29.8 | Dark | Down | 13.9 | 131.3 | Really Low | 11:00:57 - 11:30:57 | 3749 |
| The Dalles | 11:15:57 | -30.6 | Dark | Down | 14.0 | 130.5 | Really Low | 11:00:57 - 11:30:57 | 3749 |
| Goldendale | 11:15:57 | -30.3 | Dark | Down | 14.0 | 130.8 | Really Low | 11:00:57 - 11:30:57 | 3747 |
| Pasco | 11:15:57 | -29.1 | Dark | Down | 14.6 | 132.3 | Really Low | 11:00:57 - 11:30:57 | 3728 |
| George/Umatilla | 11:15:57 | -29.4 | Dark | Down | 14.7 | 132.1 | Really Low | 11:00:57 - 11:30:57 | 3726 |
| PNWRO | 11:15:57 | -29.1 | Dark | Down | 14.9 | 132.5 | Really Low | 11:00:57 - 11:30:57 | 3721 |
| Maupin | 11:15:01 | -31.0 | Dark | Down | 14.2 | 130.3 | Really Low | 11:00:01 - 11:30:01 | 3706 |
| Madras/Culver | 11:14:57 | -31.3 | Dark | Down | 14.5 | 130.1 | Really Low | 10:59:57 - 11:29:57 | 3691 |
| Sisters | 11:14:47 | -31.8 | Dark | Down | 14.5 | 129.7 | Really Low | 10:59:47 - 11:29:47 | 3686 |
| Redmond | 11:14:52 | -31.5 | Dark | Down | 14.7 | 130.0 | Really Low | 10:59:52 - 11:29:52 | 3682 |
| Bend | 11:14:50 | -31.7 | Dark | Down | 14.8 | 129.8 | Really Low | 10:59:50 - 11:29:50 | 3677 |
| Oregon Observatory | 11:14:46 | -31.9 | Dark | Down | 14.8 | 129.7 | Really Low | 10:59:46 - 11:29:46 | 3673 |
| La Pine/Gilchrist | 11:14:45 | -32.1 | Dark | Down | 14.9 | 129.6 | Really Low | 10:59:45 - 11:29:45 | 3667 |
| North Lake | 11:14:44 | -31.9 | Dark | Down | 15.5 | 130.0 | Really Low | 10:59:44 - 11:29:44 | 3649 |
| Chiloquin | 11:14:31 | -32.9 | Dark | Down | 15.4 | 129.0 | Really Low | 10:59:31 - 11:29:31 | 3637 |
| Paisley | 11:14:43 | -32.0 | Dark | Down | 16.0 | 130.1 | Really Low | 10:59:43 - 11:29:43 | 3629 |
| Klamath Falls | 11:14:32 | -33.1 | Dark | Down | 15.6 | 129.0 | Really Low | 10:59:32 - 11:29:32 | 3625 |
| Tulelake | 11:14:31 | -33.0 | Dark | Down | 16.0 | 129.2 | Really Low | 10:59:31 - 11:29:31 | 3614 |
| Lakeview | 11:14:37 | -32.2 | Dark | Down | 16.5 | 130.2 | Really Low | 10:59:37 - 11:29:37 | 3611 |
| Cedarville | 11:14:33 | -32.4 | Dark | Down | 17.0 | 130.1 | Really Low | 10:59:33 - 11:29:33 | 3587 |
| Fall River/Burney | 11:14:20 | -33.5 | Dark | Down | 16.6 | 129.0 | Really Low | 10:59:20 - 11:29:20 | 3583 |
| Susanville | 11:14:22 | -33.3 | Dark | Down | 17.4 | 129.5 | Really Low | 10:59:22 - 11:29:22 | 3554 |
| Greenville | 11:14:18 | -33.7 | Dark | Down | 17.4 | 129.1 | Really Low | 10:59:18 - 11:29:18 | 3547 |
| Gimple | 11:14:18 | -33.6 | Dark | Down | 17.4 | 129.2 | Really Low | 10:59:18 - 11:29:18 | 3546 |
| Quincy | 11:14:12 | -33.8 | Dark | Down | 17.5 | 129.1 | Really Low | 10:59:12 - 11:29:12 | 3539 |
| Portola | 11:14:17 | -33.5 | Dark | Down | 17.9 | 129.4 | Really Low | 10:59:17 - 11:29:17 | 3530 |
| Reno | 11:14:17 | -33.2 | Dark | Down | 18.4 | 129.9 | Really Low | 10:59:17 - 11:29:17 | 3513 |
| Carson City | 11:14:13 | -33.4 | Dark | Down | 18.7 | 129.8 | Really Low | 10:59:13 - 11:29:13 | 3500 |
| Gardnerville | 11:14:15 | -33.5 | Dark | Down | 18.9 | 129.8 | Really Low | 10:59:15 - 11:29:15 | 3490 |
| Yerington | 11:14:18 | -33.1 | Dark | Down | 19.2 | 130.3 | Really Low | 10:59:18 - 11:29:18 | 3486 |
| Hawthorne | 11:14:17 | -32.9 | Dark | Down | 19.8 | 130.6 | Really Low | 10:59:17 - 11:29:17 | 3461 |
| Lee Vining | 11:14:11 | -33.5 | Dark | Down | 19.8 | 130.0 | Really Low | 10:59:11 - 11:29:11 | 3444 |
| Tonopah | 11:14:22 | -32.1 | Dark | Down | 20.9 | 131.6 | Low | 10:59:22 - 11:29:22 | 3425 |
| Bishop | 11:14:11 | -33.3 | Dark | Down | 20.7 | 130.4 | Low | 10:59:11 - 11:29:11 | 3412 |
| Lone Pine | 11:14:04 | -33.4 | Dark | Down | 21.4 | 130.4 | Low | 10:59:04 - 11:29:04 | 3376 |
| Beatty | 11:14:17 | -32.3 | Dark | Down | 22.0 | 131.6 | Low | 10:59:17 - 11:29:17 | 3372 |
| CPSLO | 11:13:36 | -36.0 | Dark | Down | 20.5 | 127.9 | Low | 10:58:36 - 11:28:36 | 3349 |
| Indian Springs | 11:14:22 | -31.7 | Dark | Down | 22.9 | 132.4 | Low | 10:59:22 - 11:29:22 | 3343 |
| Henderson | 11:14:23 | -31.4 | Dark | Down | 23.6 | 132.8 | Low | 10:59:23 - 11:29:23 | 3309 |
| Niwot | 11:16:04 | -22.4 | Dark | Down | 26.0 | 143.2 | Low | 11:01:04 - 11:31:04 | 3296 |
| Searchlight/Boulder City | 11:14:15 | -31.6 | Dark | Down | 24.0 | 132.7 | Low | 10:59:15 - 11:29:15 | 3283 |
| Wildwood | 11:13:41 | -35.0 | Dark | Down | 22.6 | 129.2 | Low | 10:58:41 - 11:28:41 | 3270 |
| Laughlin/Bullhead City | 11:14:15 | -31.4 | Dark | Down | 24.4 | 132.9 | Low | 10:59:15 - 11:29:15 | 3264 |
| Patrick | 11:14:25 | -30.8 | Dark | Down | 24.7 | 133.6 | Low | 10:59:25 - 11:29:25 | 3264 |
| Kingman/Dolan Springs | 11:14:23 | -31.0 | Dark | Down | 24.8 | 133.3 | Low | 10:59:23 - 11:29:23 | 3257 |
| Mohave Valley | 11:14:15 | -31.5 | Dark | Down | 24.6 | 132.8 | Low | 10:59:15 - 11:29:15 | 3251 |
| DCO | 11:14:28 | -30.4 | Dark | Down | 25.4 | 134.1 | Low | 10:59:28 - 11:29:28 | 3238 |
| Idyllwild | 11:13:49 | -33.7 | Dark | Down | 24.0 | 130.6 | Low | 10:58:49 - 11:28:49 | 3229 |
| Lake Havasu City | 11:14:15 | -31.5 | Dark | Down | 25.1 | 132.9 | Low | 10:59:15 - 11:29:15 | 3228 |
| Parker | 11:14:08 | -31.6 | Dark | Down | 25.3 | 132.7 | Low | 10:59:08 - 11:29:08 | 3212 |
| Blythe | 11:14:05 | -32.1 | Dark | Down | 25.5 | 132.3 | Low | 10:59:05 - 11:29:05 | 3191 |
| Calipatria | 11:13:56 | -33.0 | Dark | Down | 25.2 | 131.3 | Low | 10:58:56 - 11:28:56 | 3182 |
| Yuma | 11:13:57 | -32.5 | Dark | Down | 26.0 | 131.9 | Low | 10:58:57 - 11:28:57 | 3146 |
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 50000, (2018/03/16 11:16UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 25.24 93 35Eta Oph 17:10:22.7 -15:43:29 2.6 13.70 85 PPM 234067 18:07:48.2 -17:09:14 5.3 1.62 72 PPM 234043 18:06:34.3 -14:58:23 8.2 0.59 72 PPM 234061 18:07:16.2 -15:33:24 9.5 0.01 72 50000 18:07:17.1 -15:32:31 16.3 72 Positions are for J2000
Event circumstances last updated at 2017/12/02 17:21:09 UT
Marc W. Buie, Southwest Research Institute