Event between (499514) 10OO127 and star UC4-517-138232 with event index number of 220277
Geocentric closest approach at 2018/05/16 09:44:29 UTC
J2000 position of star is 22:09:29.6 +13:19:50
Equinox of date position of star is 22:10:22.1 +13:25:09
Stellar brightness R=15.7,
use SENSEUP=128
Star is 90 degrees from the moon.
Moon is 1% illuminated.
TNO apparent brightness V=21.3
[RECON map]
TNO is 45.4 AU from the Sun
and 45.6 AU from the Earth.
The TNO is moving 15.6
km/sec on the sky relative to the star, or,
1.7 arcsec/hr.
The 1-sigma error in the time of the event is 271 seconds.
The 1-sigma cross-track error in the shadow position is
4164 km.
The sky-plane scale is
33058.9 km/arcsec.
The TNO has an absolute magnitude Hv=4.6
Diameter=724.5 km assuming a 5% albedo -- 46.5 sec chord
Diameter=295.8 km assuming a 30% albedo -- 19.0 sec chord
Dynamical classification is SCATNEAR
Star training set for 499514, (2018/05/16 09:44UT) Object RA Dec mag sep mel Deneb 20:42:03.5 +45:20:48 1.3 37.00 95 Markab 23:05:40.7 +15:18:16 2.5 13.52 77 20 Peg 22:01:59.1 +13:12:30 5.6 2.06 92 PPM 141091 22:08:52.0 +13:09:35 7.8 0.45 91 PPM 141115 22:10:09.4 +13:45:40 8.9 0.34 90 499514 22:10:23.4 +13:25:17 15.7 90 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
3.3 sigma about the mid-time.
The median site spacing is 3.9 km
RECON observability=1.0 and success probability=0.2%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| CPSLO | 09:45:32 | -30.0 | Dark | Down | 21.8 | 88.8 | Low | 09:30:32 - 10:00:32 | 15576 |
| Wildwood | 09:45:32 | -30.2 | Dark | Down | 23.4 | 89.4 | Low | 09:30:32 - 10:00:32 | 15524 |
| Quincy | 09:45:48 | -26.0 | Dark | Down | 21.6 | 90.5 | Low | 09:30:48 - 10:00:48 | 15495 |
| Greenville | 09:45:51 | -25.8 | Dark | Down | 21.6 | 90.6 | Low | 09:30:51 - 10:00:51 | 15491 |
| Gimple | 09:45:51 | -25.8 | Dark | Down | 21.7 | 90.6 | Low | 09:30:51 - 10:00:51 | 15489 |
| Portola | 09:45:46 | -25.9 | Dark | Down | 22.0 | 90.7 | Low | 09:30:46 - 10:00:46 | 15484 |
| Fall River/Burney | 09:45:53 | -25.2 | Dark | Down | 21.3 | 90.6 | Low | 09:30:53 - 10:00:53 | 15483 |
| Gardnerville | 09:45:42 | -26.4 | Dark | Down | 22.5 | 90.8 | Low | 09:30:42 - 10:00:42 | 15479 |
| Lee Vining | 09:45:33 | -27.1 | Dark | Down | 23.0 | 90.8 | Low | 09:30:33 - 10:00:33 | 15478 |
| Carson City | 09:45:39 | -26.3 | Dark | Down | 22.5 | 90.9 | Low | 09:30:39 - 10:00:39 | 15476 |
| Susanville | 09:45:52 | -25.5 | Dark | Down | 21.9 | 90.9 | Low | 09:30:52 - 10:00:52 | 15476 |
| Reno | 09:45:42 | -25.9 | Dark | Down | 22.5 | 91.0 | Low | 09:30:42 - 10:00:42 | 15469 |
| Lone Pine | 09:45:32 | -27.8 | Dark | Down | 23.9 | 90.8 | Low | 09:30:32 - 10:00:32 | 15465 |
| Bishop | 09:45:32 | -27.3 | Dark | Down | 23.6 | 91.0 | Low | 09:30:32 - 10:00:32 | 15464 |
| Klamath Falls | 09:46:03 | -24.2 | Dark | Down | 21.0 | 90.9 | Low | 09:31:03 - 10:01:03 | 15463 |
| Tulelake | 09:46:04 | -24.4 | Dark | Down | 21.2 | 91.0 | Low | 09:31:04 - 10:01:04 | 15462 |
| Yerington | 09:45:43 | -26.2 | Dark | Down | 23.0 | 91.2 | Low | 09:30:43 - 10:00:43 | 15459 |
| Idyllwild | 09:45:32 | -29.6 | Dark | Down | 25.0 | 90.3 | Low | 09:30:32 - 10:00:32 | 15458 |
| Chiloquin | 09:46:07 | -23.9 | Dark | Down | 21.0 | 91.0 | Low | 09:31:07 - 10:01:07 | 15456 |
| Hawthorne | 09:45:38 | -26.4 | Dark | Down | 23.4 | 91.4 | Low | 09:30:38 - 10:00:38 | 15450 |
| Cedarville | 09:45:55 | -24.3 | Dark | Down | 22.2 | 91.7 | Low | 09:30:55 - 10:00:55 | 15433 |
| Lakeview | 09:46:05 | -23.8 | Dark | Down | 22.1 | 91.8 | Low | 09:31:05 - 10:01:05 | 15422 |
| Paisley | 09:46:03 | -23.4 | Dark | Down | 21.9 | 91.9 | Low | 09:31:03 - 10:01:03 | 15414 |
| La Pine/Gilchrist | 09:46:14 | -22.8 | Dark | Down | 21.2 | 91.6 | Low | 09:31:14 - 10:01:14 | 15414 |
| Beatty | 09:45:32 | -27.0 | Dark | Down | 24.9 | 91.8 | Low | 09:30:32 - 10:00:32 | 15412 |
| Calipatria | 09:45:00 | -29.6 | Dark | Down | 25.9 | 90.6 | Low | 09:30:00 - 10:00:00 | 15411 |
| Tonopah | 09:45:35 | -26.2 | Dark | Down | 24.5 | 92.0 | Low | 09:30:35 - 10:00:35 | 15409 |
| North Lake | 09:46:13 | -23.0 | Dark | Down | 21.7 | 91.9 | Low | 09:31:13 - 10:01:13 | 15409 |
| Oregon Observatory | 09:46:12 | -22.6 | Dark | Down | 21.3 | 91.8 | Low | 09:31:12 - 10:01:12 | 15406 |
| Sisters | 09:46:17 | -22.3 | Dark | Down | 21.2 | 91.8 | Low | 09:31:17 - 10:01:17 | 15397 |
| Bend | 09:46:18 | -22.4 | Dark | Down | 21.4 | 91.9 | Low | 09:31:18 - 10:01:18 | 15397 |
| Redmond | 09:46:20 | -22.2 | Dark | Down | 21.5 | 92.1 | Low | 09:31:20 - 10:01:20 | 15386 |
| Yuma | 09:44:57 | -29.6 | Dark | Down | 26.6 | 90.9 | Low | 09:29:57 - 09:59:57 | 15378 |
| Indian Springs | 09:45:32 | -26.8 | Dark | Down | 25.8 | 92.3 | Low | 09:30:32 - 10:00:32 | 15377 |
| Madras/Culver | 09:46:21 | -21.8 | Dark | Down | 21.5 | 92.3 | Low | 09:31:21 - 10:01:21 | 15374 |
| Blythe | 09:45:04 | -28.8 | Dark | Down | 26.7 | 91.4 | Low | 09:30:04 - 10:00:04 | 15368 |
| Searchlight/Boulder City | 09:45:32 | -27.4 | Dark | Down | 26.4 | 92.2 | Low | 09:30:32 - 10:00:32 | 15363 |
| Henderson | 09:45:32 | -26.9 | Dark | Down | 26.4 | 92.4 | Low | 09:30:32 - 10:00:32 | 15358 |
| Mohave Valley | 09:45:32 | -27.7 | Dark | Down | 26.8 | 92.1 | Low | 09:30:32 - 10:00:32 | 15357 |
| Maupin | 09:46:21 | -21.3 | Dark | Down | 21.5 | 92.6 | Low | 09:31:21 - 10:01:21 | 15356 |
| Parker | 09:45:32 | -28.2 | Dark | Down | 27.0 | 91.9 | Low | 09:30:32 - 10:00:32 | 15355 |
| Laughlin/Bullhead City | 09:45:32 | -27.5 | Dark | Down | 26.7 | 92.2 | Low | 09:30:32 - 10:00:32 | 15353 |
| Lake Havasu City | 09:45:32 | -27.9 | Dark | Down | 27.0 | 92.1 | Low | 09:30:32 - 10:00:32 | 15352 |
| The Dalles | 09:46:24 | -21.0 | Dark | Down | 21.4 | 92.7 | Low | 09:31:24 - 10:01:24 | 15345 |
| Kingman/Dolan Springs | 09:45:32 | -27.2 | Dark | Down | 27.2 | 92.6 | Low | 09:30:32 - 10:00:32 | 15332 |
| Goldendale | 09:46:28 | -20.7 | Dark | Down | 21.7 | 93.0 | Low | 09:31:28 - 10:01:28 | 15327 |
| Patrick | 09:45:32 | -26.9 | Dark | Down | 27.3 | 92.8 | Low | 09:30:32 - 10:00:32 | 15320 |
| Toppenish/White Swan | 09:46:28 | -20.1 | Dark | Down | 21.9 | 93.6 | Low | 09:31:28 - 10:01:28 | 15297 |
| DCO | 09:45:32 | -26.8 | Dark | Down | 27.9 | 93.1 | Low | 09:30:32 - 10:00:32 | 15295 |
| Yakima | 09:46:29 | -19.9 | Dark | Down | 21.8 | 93.5 | Low | 09:31:29 - 10:01:29 | 15294 |
| George/Umatilla | 09:46:26 | -20.1 | Dark | Down | 22.7 | 94.1 | Low | 09:31:26 - 10:01:26 | 15281 |
| Ellensburg | 09:46:35 | -19.5 | Dark | Down | 21.8 | 93.7 | Low | 09:31:35 - 10:01:35 | 15280 |
| PNWRO | 09:46:30 | -19.9 | Dark | Down | 23.0 | 94.5 | Low | 09:31:30 - 10:01:30 | 15265 |
| Pasco | 09:46:32 | -19.7 | Dark | Down | 22.8 | 94.5 | Low | 09:31:32 - 10:01:32 | 15264 |
| Wenatchee | 09:46:41 | -19.1 | Dark | Down | 21.9 | 94.1 | Low | 09:31:41 - 10:01:41 | 15259 |
| Entiat | 09:46:36 | -18.8 | Dark | Down | 22.0 | 94.2 | Low | 09:31:36 - 10:01:36 | 15247 |
| Manson/Chelan | 09:46:39 | -18.6 | Dark | Down | 22.0 | 94.4 | Low | 09:31:39 - 10:01:39 | 15237 |
| Brewster | 09:46:42 | -18.3 | Dark | Down | 22.3 | 94.8 | Low | 09:31:42 - 10:01:42 | 15220 |
| Okanogan | 09:46:43 | -18.0 | Dark | Down | 22.4 | 95.0 | Low | 09:31:43 - 10:01:43 | 15204 |
| Tonasket | 09:46:46 | -17.7 | AT | Down | 22.4 | 95.3 | Low | 09:31:46 - 10:01:46 | 15187 |
| Oroville | 09:46:43 | -17.5 | AT | Down | 22.4 | 95.4 | Low | 09:31:43 - 10:01:43 | 15179 |
| Niwot | 09:45:50 | -18.9 | Dark | Down | 33.6 | 101.4 | Up | 09:30:50 - 10:00:50 | 14861 |
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 499514, (2018/05/16 09:44UT) Object RA Dec mag sep mel Deneb 20:41:25.9 +45:16:49 1.3 37.00 95 Markab 23:04:45.7 +15:12:18 2.5 13.52 77 20 Peg 22:01:05.4 +13:07:10 5.6 2.06 92 PPM 141091 22:07:58.2 +13:04:09 7.8 0.45 91 PPM 141115 22:09:15.7 +13:40:14 8.9 0.34 90 499514 22:09:29.6 +13:19:50 15.7 90 Positions are for J2000
Event circumstances last updated at 2017/12/02 17:32:56 UT
Marc W. Buie, Southwest Research Institute