Event between (8405) Asbolus and star UC4-650-022607 with event index number of 95789
Geocentric closest approach at 2017/12/15 12:42:41 UTC
J2000 position of star is 04:46:48.1 +39:54:03
Equinox of date position of star is 04:48:02.2 +39:55:55
Stellar brightness R=16.4,
use SENSEUP=128
Star is 149 degrees from the moon.
Moon is 7% illuminated.
TNO apparent brightness V=22.4
[RECON map]
TNO is 21.2 AU from the Sun
and 20.3 AU from the Earth.
The TNO is moving 25.3
km/sec on the sky relative to the star, or,
6.2 arcsec/hr.
The 1-sigma error in the time of the event is 125 seconds.
The 1-sigma cross-track error in the shadow position is
1125 km.
The sky-plane scale is
14689.8 km/arcsec.
The TNO has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 3.6 sec chord
Diameter=37.2 km assuming a 30% albedo -- 1.5 sec chord
Dynamical classification is CENTAURR
Star training set for 8405, (2017/12/15 12:43UT) Object RA Dec mag sep mel Aldebaran 04:36:57.2 +16:32:38 0.8 23.51 164 3Iot Aur 04:58:09.9 +33:11:34 2.7 7.04 152 PPM 047304 04:45:27.8 +40:49:06 6.0 1.01 149 PPM 047344 04:47:59.0 +40:20:37 6.9 0.41 149 PPM 069653 04:49:22.0 +39:59:51 9.9 0.26 149 8405 04:48:02.4 +39:55:56 16.4 149 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
5.0 sigma about the mid-time.
The median site spacing is 14.6 km
RECON observability=1.0 and success probability=23.4%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Niwot | 12:39:09 | -17.8 | AT | Up | 19.8 | 306.0 | Really Low | 12:28:15 - 12:50:03 | 1684 |
| Oroville | 12:39:37 | -29.2 | Dark | Down | 33.0 | 294.8 | Up | 12:28:43 - 12:50:31 | 1616 |
| Tonasket | 12:39:36 | -29.2 | Dark | Down | 32.9 | 295.0 | Up | 12:28:42 - 12:50:30 | 1598 |
| Okanogan | 12:39:35 | -29.3 | Dark | Down | 32.8 | 295.1 | Up | 12:28:41 - 12:50:29 | 1566 |
| Brewster | 12:39:34 | -29.4 | Dark | Down | 32.8 | 295.1 | Up | 12:28:40 - 12:50:28 | 1536 |
| Manson/Chelan | 12:39:34 | -29.6 | Dark | Down | 32.9 | 295.0 | Up | 12:28:40 - 12:50:28 | 1503 |
| Entiat | 12:39:34 | -29.7 | Dark | Down | 32.9 | 295.1 | Up | 12:28:40 - 12:50:28 | 1483 |
| Wenatchee | 12:39:33 | -29.7 | Dark | Down | 32.9 | 295.2 | Up | 12:28:39 - 12:50:27 | 1458 |
| Pasco | 12:39:29 | -28.8 | Dark | Down | 31.6 | 296.5 | Up | 12:28:35 - 12:50:23 | 1424 |
| Ellensburg | 12:39:32 | -29.9 | Dark | Down | 32.8 | 295.3 | Up | 12:28:38 - 12:50:26 | 1416 |
| PNWRO | 12:39:28 | -28.7 | Dark | Down | 31.4 | 296.8 | Up | 12:28:34 - 12:50:22 | 1415 |
| George/Umatilla | 12:39:28 | -29.0 | Dark | Down | 31.6 | 296.6 | Up | 12:28:34 - 12:50:22 | 1387 |
| Yakima | 12:39:31 | -29.9 | Dark | Down | 32.7 | 295.5 | Up | 12:28:37 - 12:50:25 | 1383 |
| Toppenish/White Swan | 12:39:31 | -29.7 | Dark | Down | 32.5 | 295.8 | Up | 12:28:37 - 12:50:25 | 1374 |
| Goldendale | 12:39:29 | -30.0 | Dark | Down | 32.5 | 295.8 | Up | 12:28:35 - 12:50:23 | 1311 |
| The Dalles | 12:39:29 | -30.2 | Dark | Down | 32.6 | 295.8 | Up | 12:28:35 - 12:50:23 | 1275 |
| Maupin | 12:39:28 | -30.1 | Dark | Down | 32.4 | 296.1 | Up | 12:28:34 - 12:50:22 | 1247 |
| Madras/Culver | 12:39:27 | -30.1 | Dark | Down | 32.2 | 296.4 | Up | 12:28:33 - 12:50:21 | 1201 |
| Redmond | 12:39:26 | -30.1 | Dark | Down | 32.0 | 296.5 | Up | 12:28:32 - 12:50:20 | 1170 |
| Sisters | 12:39:26 | -30.4 | Dark | Down | 32.3 | 296.3 | Up | 12:28:32 - 12:50:20 | 1152 |
| Bend | 12:39:25 | -30.2 | Dark | Down | 32.0 | 296.6 | Up | 12:28:31 - 12:50:19 | 1146 |
| Oregon Observatory | 12:39:25 | -30.3 | Dark | Down | 32.0 | 296.6 | Up | 12:28:31 - 12:50:19 | 1125 |
| La Pine/Gilchrist | 12:39:24 | -30.3 | Dark | Down | 32.0 | 296.7 | Up | 12:28:30 - 12:50:18 | 1106 |
| North Lake | 12:39:23 | -29.9 | Dark | Down | 31.4 | 297.2 | Up | 12:28:29 - 12:50:17 | 1100 |
| Paisley | 12:39:21 | -29.6 | Dark | Down | 30.9 | 297.7 | Up | 12:28:27 - 12:50:15 | 1072 |
| Lakeview | 12:39:20 | -29.4 | Dark | Down | 30.6 | 298.0 | Up | 12:28:26 - 12:50:14 | 1041 |
| Chiloquin | 12:39:22 | -30.5 | Dark | Down | 31.7 | 297.1 | Up | 12:28:28 - 12:50:16 | 997 |
| Cedarville | 12:39:18 | -29.2 | Dark | Down | 30.1 | 298.5 | Up | 12:28:24 - 12:50:12 | 996 |
| Klamath Falls | 12:39:21 | -30.4 | Dark | Down | 31.5 | 297.4 | Up | 12:28:27 - 12:50:15 | 973 |
| Tulelake | 12:39:20 | -30.2 | Dark | Down | 31.2 | 297.6 | Up | 12:28:26 - 12:50:14 | 966 |
| Fall River/Burney | 12:39:18 | -30.1 | Dark | Down | 30.7 | 298.2 | Up | 12:28:24 - 12:50:12 | 894 |
| Susanville | 12:39:16 | -29.4 | Dark | Down | 29.9 | 298.8 | Low | 12:28:22 - 12:50:10 | 880 |
| Tonopah | 12:39:08 | -26.5 | Dark | Up | 26.5 | 301.4 | Low | 12:28:14 - 12:50:02 | 867 |
| DCO | 12:38:59 | -22.7 | Dark | Up | 22.2 | 304.1 | Low | 12:28:05 - 12:49:53 | 854 |
| Reno | 12:39:13 | -28.7 | Dark | Up | 29.0 | 299.6 | Low | 12:28:19 - 12:50:07 | 851 |
| Gimple | 12:39:16 | -29.6 | Dark | Down | 29.9 | 298.9 | Low | 12:28:22 - 12:50:10 | 846 |
| Greenville | 12:39:16 | -29.6 | Dark | Down | 30.0 | 298.8 | Low | 12:28:22 - 12:50:10 | 842 |
| Yerington | 12:39:12 | -28.1 | Dark | Up | 28.2 | 300.1 | Low | 12:28:18 - 12:50:06 | 839 |
| Portola | 12:39:14 | -29.2 | Dark | Down | 29.5 | 299.2 | Low | 12:28:20 - 12:50:08 | 839 |
| Patrick | 12:39:01 | -23.4 | Dark | Up | 22.8 | 303.7 | Low | 12:28:07 - 12:49:55 | 838 |
| Indian Springs | 12:39:04 | -25.0 | Dark | Up | 24.7 | 302.6 | Low | 12:28:10 - 12:49:58 | 830 |
| Hawthorne | 12:39:10 | -27.6 | Dark | Up | 27.7 | 300.6 | Low | 12:28:16 - 12:50:04 | 829 |
| Henderson | 12:39:02 | -24.4 | Dark | Up | 23.9 | 303.0 | Low | 12:28:08 - 12:49:56 | 825 |
| Quincy | 12:39:15 | -29.6 | Dark | Down | 29.9 | 298.9 | Low | 12:28:21 - 12:50:09 | 825 |
| Carson City | 12:39:12 | -28.6 | Dark | Up | 28.8 | 299.8 | Low | 12:28:18 - 12:50:06 | 822 |
| Kingman/Dolan Springs | 12:39:00 | -23.5 | Dark | Up | 22.8 | 303.7 | Low | 12:28:06 - 12:49:54 | 809 |
| Gardnerville | 12:39:12 | -28.6 | Dark | Up | 28.6 | 299.9 | Low | 12:28:18 - 12:50:06 | 804 |
| Beatty | 12:39:05 | -25.9 | Dark | Up | 25.6 | 302.0 | Low | 12:28:11 - 12:49:59 | 797 |
| Searchlight/Boulder City | 12:39:01 | -24.2 | Dark | Up | 23.5 | 303.3 | Low | 12:28:07 - 12:49:55 | 782 |
| Laughlin/Bullhead City | 12:39:00 | -23.9 | Dark | Up | 23.1 | 303.5 | Low | 12:28:06 - 12:49:54 | 778 |
| Lee Vining | 12:39:09 | -27.9 | Dark | Up | 27.7 | 300.6 | Low | 12:28:15 - 12:50:03 | 756 |
| Mohave Valley | 12:39:00 | -23.8 | Dark | Up | 23.0 | 303.6 | Low | 12:28:06 - 12:49:54 | 756 |
| Bishop | 12:39:07 | -27.3 | Dark | Up | 26.9 | 301.2 | Low | 12:28:13 - 12:50:01 | 746 |
| Lake Havasu City | 12:38:59 | -23.5 | Dark | Up | 22.6 | 303.8 | Low | 12:28:05 - 12:49:53 | 738 |
| Parker | 12:38:58 | -23.4 | Dark | Up | 22.4 | 304.0 | Low | 12:28:04 - 12:49:52 | 711 |
| Lone Pine | 12:39:05 | -26.9 | Dark | Up | 26.3 | 301.6 | Low | 12:28:11 - 12:49:59 | 701 |
| Blythe | 12:38:57 | -23.5 | Dark | Up | 22.3 | 304.0 | Low | 12:28:03 - 12:49:51 | 650 |
| Yuma | 12:38:56 | -23.4 | Dark | Up | 21.8 | 304.3 | Low | 12:28:02 - 12:49:50 | 572 |
| Calipatria | 12:38:57 | -24.2 | Dark | Up | 22.7 | 303.9 | Low | 12:28:03 - 12:49:51 | 556 |
| Idyllwild | 12:38:59 | -25.3 | Dark | Up | 23.8 | 303.2 | Low | 12:28:05 - 12:49:53 | 538 |
| Wildwood | 12:39:01 | -26.9 | Dark | Up | 25.3 | 302.4 | Low | 12:28:07 - 12:49:55 | 461 |
| CPSLO | 12:39:05 | -28.8 | Dark | Up | 27.4 | 301.2 | Low | 12:28:11 - 12:49:59 | 450 |
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 8405, (2017/12/15 12:43UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:30 0.8 23.51 164 3Iot Aur 04:56:59.6 +33:09:58 2.7 7.04 152 PPM 047304 04:44:13.0 +40:47:10 6.0 1.01 149 PPM 047344 04:46:44.5 +40:18:44 6.9 0.41 149 PPM 069653 04:48:07.7 +39:58:01 9.9 0.26 149 8405 04:46:48.1 +39:54:03 16.4 149 Positions are for J2000
Event circumstances last updated at 2017/12/02 17:06:11 UT
Marc W. Buie, Southwest Research Institute