Event between (307261) 02MS4 and star UC4-418-093843 with event index number of 339848
Geocentric closest approach at 2019/07/16 10:44:59 UTC
J2000 position of star is 18:44:47.8 -06:25:05
Equinox of date position of star is 18:45:49.1 -06:23:50
Stellar brightness R=16.5,
use SENSEUP=128
Star is 18 degrees from the moon.
Moon is 100% illuminated.
TNO apparent brightness V=20.3
[RECON map]
TNO is 46.6 AU from the Sun
and 45.6 AU from the Earth.
The TNO is moving 24.6
km/sec on the sky relative to the star, or,
2.7 arcsec/hr.
The 1-sigma error in the time of the event is 199 seconds.
The 1-sigma cross-track error in the shadow position is
1938 km.
The sky-plane scale is
33095.7 km/arcsec.
The TNO has an absolute magnitude Hv=3.6
Diameter=1148.2 km assuming a 5% albedo -- 46.6 sec chord
Diameter=468.7 km assuming a 30% albedo -- 19.0 sec chord
Dynamical classification is SCATEXTD
Star training set for 307261, (2019/07/16 10:45UT) Object RA Dec mag sep mel Antares 16:30:36.5 -26:28:25 0.9 37.93 39 60Bet Oph 17:44:26.3 +04:33:38 2.8 18.84 36 PPM 202054 18:43:39.4 -07:03:12 6.5 0.85 18 PPM 202094 18:45:43.9 -06:30:53 6.8 0.12 18 PPM 202101 18:45:52.6 -06:19:09 9.1 0.08 18 307261 18:45:50.7 -06:23:48 16.5 18 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
4.5 sigma about the mid-time.
The median site spacing is 22.1 km
RECON observability=0.7 and success probability=16.5%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Summerland | 10:42:19 | -10.7 | NT | Up | 17.1 | 236.8 | Really Low | 10:27:19 - 10:57:19 | 1741 |
| Kelowna | 10:42:19 | -10.5 | NT | Up | 16.9 | 237.1 | Really Low | 10:27:19 - 10:57:19 | 1740 |
| Penticton | 10:42:18 | -10.9 | NT | Up | 17.2 | 237.1 | Really Low | 10:27:18 - 10:57:18 | 1715 |
| Okanagan Falls | 10:42:18 | -11.1 | NT | Up | 17.3 | 237.1 | Really Low | 10:27:18 - 10:57:18 | 1701 |
| Oliver | 10:42:17 | -11.2 | NT | Up | 17.4 | 237.2 | Really Low | 10:27:17 - 10:57:17 | 1689 |
| Anarchist Mountain Observatory | 10:42:16 | -11.2 | NT | Up | 17.4 | 237.4 | Really Low | 10:27:16 - 10:57:16 | 1673 |
| Oroville | 10:42:16 | -11.3 | NT | Up | 17.5 | 237.3 | Really Low | 10:27:16 - 10:57:16 | 1669 |
| Tonasket | 10:42:16 | -11.5 | NT | Up | 17.6 | 237.4 | Really Low | 10:27:16 - 10:57:16 | 1651 |
| Okanogan | 10:42:15 | -11.8 | NT | Up | 17.9 | 237.4 | Really Low | 10:27:15 - 10:57:15 | 1627 |
| Brewster | 10:42:15 | -12.1 | AT | Up | 18.1 | 237.3 | Really Low | 10:27:15 - 10:57:15 | 1609 |
| Manson/Chelan | 10:42:15 | -12.5 | AT | Up | 18.4 | 237.0 | Really Low | 10:27:15 - 10:57:15 | 1598 |
| Entiat | 10:42:15 | -12.7 | AT | Up | 18.6 | 237.0 | Really Low | 10:27:15 - 10:57:15 | 1582 |
| Wenatchee | 10:42:14 | -12.9 | AT | Up | 18.8 | 237.0 | Really Low | 10:27:14 - 10:57:14 | 1563 |
| Ellensburg | 10:42:14 | -13.3 | AT | Up | 19.2 | 236.9 | Really Low | 10:27:14 - 10:57:14 | 1534 |
| Yakima | 10:42:13 | -13.7 | AT | Up | 19.4 | 237.0 | Really Low | 10:27:13 - 10:57:13 | 1503 |
| Toppenish/White Swan | 10:42:12 | -13.8 | AT | Up | 19.4 | 237.2 | Really Low | 10:27:12 - 10:57:12 | 1484 |
| Pasco | 10:42:09 | -13.3 | AT | Up | 18.7 | 238.3 | Really Low | 10:27:09 - 10:57:09 | 1458 |
| Goldendale | 10:42:12 | -14.4 | AT | Up | 20.0 | 237.0 | Really Low | 10:27:12 - 10:57:12 | 1446 |
| PNWRO | 10:42:09 | -13.4 | AT | Up | 18.7 | 238.6 | Really Low | 10:27:09 - 10:57:09 | 1435 |
| George/Umatilla | 10:42:09 | -13.7 | AT | Up | 19.0 | 238.2 | Really Low | 10:27:09 - 10:57:09 | 1434 |
| The Dalles | 10:42:12 | -14.7 | AT | Up | 20.3 | 236.8 | Low | 10:27:12 - 10:57:12 | 1433 |
| Maupin | 10:42:11 | -15.0 | AT | Up | 20.5 | 237.0 | Low | 10:27:11 - 10:57:11 | 1398 |
| Madras/Culver | 10:42:10 | -15.5 | AT | Up | 20.8 | 237.1 | Low | 10:27:10 - 10:57:10 | 1354 |
| Sisters | 10:42:10 | -15.9 | AT | Up | 21.2 | 236.9 | Low | 10:27:10 - 10:57:10 | 1334 |
| Redmond | 10:42:09 | -15.8 | AT | Up | 21.0 | 237.2 | Low | 10:27:09 - 10:57:09 | 1326 |
| Bend | 10:42:09 | -16.0 | AT | Up | 21.2 | 237.2 | Low | 10:27:09 - 10:57:09 | 1311 |
| Oregon Observatory | 10:42:09 | -16.2 | AT | Up | 21.4 | 237.1 | Low | 10:27:09 - 10:57:09 | 1298 |
| La Pine/Gilchrist | 10:42:09 | -16.4 | AT | Up | 21.5 | 237.1 | Low | 10:27:09 - 10:57:09 | 1283 |
| North Lake | 10:42:07 | -16.5 | AT | Up | 21.4 | 237.8 | Low | 10:27:07 - 10:57:07 | 1239 |
| Chiloquin | 10:42:07 | -17.5 | AT | Up | 22.4 | 237.2 | Low | 10:27:07 - 10:57:07 | 1196 |
| Paisley | 10:42:05 | -16.8 | AT | Up | 21.5 | 238.2 | Low | 10:27:05 - 10:57:05 | 1188 |
| Klamath Falls | 10:42:06 | -17.7 | AT | Up | 22.5 | 237.4 | Low | 10:27:06 - 10:57:06 | 1166 |
| Lakeview | 10:42:03 | -17.1 | AT | Up | 21.6 | 238.6 | Low | 10:27:03 - 10:57:03 | 1143 |
| Tulelake | 10:42:05 | -17.8 | AT | Up | 22.5 | 237.7 | Low | 10:27:05 - 10:57:05 | 1139 |
| Cedarville | 10:42:02 | -17.6 | AT | Up | 21.9 | 238.9 | Low | 10:27:02 - 10:57:02 | 1086 |
| Fall River/Burney | 10:42:03 | -18.5 | Dark | Up | 22.9 | 238.1 | Low | 10:27:03 - 10:57:03 | 1062 |
| Susanville | 10:42:00 | -18.7 | Dark | Up | 22.8 | 238.9 | Low | 10:27:00 - 10:57:00 | 997 |
| Greenville | 10:42:01 | -19.0 | Dark | Up | 23.1 | 238.8 | Low | 10:27:01 - 10:57:01 | 978 |
| Gimple | 10:42:01 | -19.0 | Dark | Up | 23.0 | 238.8 | Low | 10:27:01 - 10:57:01 | 976 |
| Quincy | 10:42:00 | -19.2 | Dark | Up | 23.2 | 238.9 | Low | 10:27:00 - 10:57:00 | 960 |
| Portola | 10:41:59 | -19.1 | Dark | Up | 22.9 | 239.3 | Low | 10:26:59 - 10:56:59 | 943 |
| Reno | 10:41:57 | -19.0 | Dark | Up | 22.6 | 239.9 | Low | 10:26:57 - 10:56:57 | 910 |
| Carson City | 10:41:57 | -19.2 | Dark | Up | 22.8 | 240.0 | Low | 10:26:57 - 10:56:57 | 879 |
| Gardnerville | 10:41:56 | -19.4 | Dark | Up | 22.9 | 240.2 | Low | 10:26:56 - 10:56:56 | 857 |
| Yerington | 10:41:55 | -19.1 | Dark | Up | 22.5 | 240.6 | Low | 10:26:55 - 10:56:55 | 852 |
| Hawthorne | 10:41:53 | -19.2 | Dark | Up | 22.4 | 241.2 | Low | 10:26:53 - 10:56:53 | 804 |
| Lee Vining | 10:41:53 | -19.9 | Dark | Up | 23.0 | 241.0 | Low | 10:26:53 - 10:56:53 | 761 |
| Niwot | 10:41:34 | -10.8 | NT | Up | 12.3 | 250.6 | Really Low | 10:26:34 - 10:56:34 | 760 |
| Tonopah | 10:41:49 | -18.8 | Dark | Up | 21.6 | 242.4 | Low | 10:26:49 - 10:56:49 | 742 |
| Bishop | 10:41:51 | -20.0 | Dark | Up | 22.8 | 241.8 | Low | 10:26:51 - 10:56:51 | 697 |
| Beatty | 10:41:46 | -19.5 | Dark | Up | 21.8 | 243.2 | Low | 10:26:46 - 10:56:46 | 631 |
| Lone Pine | 10:41:49 | -20.4 | Dark | Up | 22.9 | 242.3 | Low | 10:26:49 - 10:56:49 | 623 |
| Indian Springs | 10:41:43 | -19.1 | Dark | Up | 21.2 | 244.1 | Low | 10:26:43 - 10:56:43 | 586 |
| CPSLO | 10:41:52 | -22.7 | Dark | Up | 25.3 | 240.9 | Low | 10:26:52 - 10:56:52 | 544 |
| Henderson | 10:41:42 | -19.1 | Dark | Up | 20.9 | 244.8 | Low | 10:26:42 - 10:56:42 | 527 |
| Searchlight/Boulder City | 10:41:40 | -19.5 | Dark | Up | 21.1 | 245.0 | Low | 10:26:40 - 10:56:40 | 473 |
| Patrick | 10:41:38 | -19.0 | Dark | Up | 20.4 | 245.8 | Low | 10:26:38 - 10:56:38 | 453 |
| Laughlin/Bullhead City | 10:41:39 | -19.6 | Dark | Up | 21.0 | 245.4 | Low | 10:26:39 - 10:56:39 | 441 |
| Kingman/Dolan Springs | 10:41:38 | -19.2 | Dark | Up | 20.6 | 245.7 | Low | 10:26:38 - 10:56:38 | 435 |
| Mohave Valley | 10:41:39 | -19.7 | Dark | Up | 21.1 | 245.4 | Low | 10:26:39 - 10:56:39 | 415 |
| DCO | 10:41:37 | -18.8 | Dark | Up | 20.0 | 246.4 | Really Low | 10:26:37 - 10:56:37 | 414 |
| Wildwood | 10:41:45 | -22.6 | Dark | Up | 24.4 | 242.9 | Low | 10:26:45 - 10:56:45 | 401 |
| Lake Havasu City | 10:41:37 | -19.9 | Dark | Up | 21.1 | 245.8 | Low | 10:26:37 - 10:56:37 | 374 |
| Parker | 10:41:37 | -20.1 | Dark | Up | 21.2 | 245.9 | Low | 10:26:37 - 10:56:37 | 341 |
| Idyllwild | 10:41:41 | -21.8 | Dark | Up | 23.2 | 244.4 | Low | 10:26:41 - 10:56:41 | 339 |
| Blythe | 10:41:37 | -20.7 | Dark | Up | 21.7 | 245.9 | Low | 10:26:37 - 10:56:37 | 296 |
| Calipatria | 10:41:38 | -21.6 | Dark | Up | 22.6 | 245.4 | Low | 10:26:38 - 10:56:38 | 264 |
| Yuma | 10:41:35 | -21.4 | Dark | Up | 22.1 | 246.2 | Low | 10:26:35 - 10:56:35 | 209 |
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 307261, (2019/07/16 10:45UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 37.93 39 60Bet Oph 17:43:28.3 +04:34:05 2.8 18.84 36 PPM 202054 18:42:36.1 -07:04:26 6.5 0.85 18 PPM 202094 18:44:40.9 -06:32:10 6.8 0.12 18 PPM 202101 18:44:49.7 -06:20:26 9.1 0.08 18 307261 18:44:47.8 -06:25:05 16.5 18 Positions are for J2000
Event circumstances last updated at 2019/01/17 21:52:15 UT
Marc W. Buie, Southwest Research Institute