Event between (32532) Thereus and star UC4-442-043255 with event index number of 105683
Geocentric closest approach at 2018/02/09 04:42:04 UTC
J2000 position of star is 08:00:33.1 -01:37:48
Equinox of date position of star is 08:01:28.2 -01:40:50
Stellar brightness R=15.2,
use SENSEUP=128
Star is 124 degrees from the moon.
Moon is 36% illuminated.
TNO apparent brightness V=20.2
[RECON map]
TNO is 12.7 AU from the Sun
and 11.8 AU from the Earth.
The TNO is moving 21.7
km/sec on the sky relative to the star, or,
9.1 arcsec/hr.
The 1-sigma error in the time of the event is 54 seconds.
The 1-sigma cross-track error in the shadow position is
643 km.
The sky-plane scale is
8554.0 km/arcsec.
The TNO has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 4.2 sec chord
Diameter=37.2 km assuming a 30% albedo -- 1.7 sec chord
Dynamical classification is CENTAURR
Star training set for 32532, (2018/02/09 04:42UT) Object RA Dec mag sep mel Sirius 06:45:56.7 -16:44:31 -1.5 23.92 132 15Rho Pup 08:08:18.9 -24:21:27 2.8 22.74 112 27 Mon 08:00:38.4 -03:43:48 4.9 2.06 123 28 Mon 08:02:08.6 -01:26:39 6.7 0.29 124 PPM 177240 08:02:24.9 -01:43:40 9.7 0.24 124 PPM 177230 08:01:02.9 -01:32:04 10.3 0.18 124 32532 08:01:28.2 -01:40:51 15.2 124 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 19.7 km
RECON observability=1.0 and success probability=0.4%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Oroville | 04:44:56 | -35.8 | Dark | Down | 33.5 | 144.3 | Up | 04:39:54 - 04:49:57 | 3742 |
| Tonasket | 04:44:56 | -35.9 | Dark | Down | 33.7 | 144.2 | Up | 04:39:55 - 04:49:58 | 3724 |
| Okanogan | 04:44:57 | -35.9 | Dark | Down | 33.9 | 143.9 | Up | 04:39:55 - 04:49:58 | 3692 |
| Brewster | 04:44:57 | -35.9 | Dark | Down | 34.1 | 143.6 | Up | 04:39:56 - 04:49:59 | 3665 |
| Manson/Chelan | 04:44:58 | -35.7 | Dark | Down | 34.1 | 143.1 | Up | 04:39:57 - 04:50:00 | 3639 |
| Entiat | 04:44:59 | -35.7 | Dark | Down | 34.2 | 143.0 | Up | 04:39:57 - 04:50:00 | 3619 |
| Wenatchee | 04:44:59 | -35.7 | Dark | Down | 34.4 | 142.7 | Up | 04:39:57 - 04:50:00 | 3595 |
| Ellensburg | 04:45:00 | -35.7 | Dark | Down | 34.6 | 142.3 | Up | 04:39:59 - 04:50:02 | 3555 |
| Pasco | 04:44:56 | -36.9 | Dark | Down | 35.8 | 143.6 | Up | 04:39:55 - 04:49:58 | 3529 |
| Yakima | 04:45:00 | -35.9 | Dark | Down | 35.0 | 142.1 | Up | 04:39:59 - 04:50:02 | 3521 |
| PNWRO | 04:44:55 | -37.1 | Dark | Down | 36.1 | 143.7 | Up | 04:39:54 - 04:49:57 | 3514 |
| Toppenish/White Swan | 04:45:00 | -36.0 | Dark | Down | 35.2 | 142.2 | Up | 04:39:58 - 04:50:01 | 3507 |
| George/Umatilla | 04:44:57 | -36.9 | Dark | Down | 36.0 | 143.2 | Up | 04:39:56 - 04:49:59 | 3495 |
| Goldendale | 04:45:01 | -35.9 | Dark | Down | 35.5 | 141.5 | Up | 04:40:00 - 04:50:03 | 3449 |
| The Dalles | 04:45:02 | -35.7 | Dark | Down | 35.5 | 141.0 | Up | 04:40:01 - 04:50:04 | 3420 |
| Niwot | 04:44:11 | -48.5 | Dark | Down | 46.1 | 158.1 | Up | 04:39:10 - 04:49:13 | 3412 |
| Maupin | 04:45:02 | -35.9 | Dark | Down | 35.8 | 140.9 | Up | 04:40:01 - 04:50:04 | 3387 |
| Madras/Culver | 04:45:02 | -36.1 | Dark | Down | 36.2 | 140.7 | Up | 04:40:01 - 04:50:04 | 3339 |
| Redmond | 04:45:03 | -36.1 | Dark | Down | 36.5 | 140.4 | Up | 04:40:01 - 04:50:04 | 3307 |
| Sisters | 04:45:04 | -35.8 | Dark | Down | 36.3 | 140.0 | Up | 04:40:03 - 04:50:06 | 3298 |
| Bend | 04:45:03 | -36.1 | Dark | Down | 36.6 | 140.2 | Up | 04:40:02 - 04:50:05 | 3284 |
| Oregon Observatory | 04:45:04 | -36.0 | Dark | Down | 36.7 | 139.9 | Up | 04:40:02 - 04:50:05 | 3266 |
| La Pine/Gilchrist | 04:45:04 | -36.1 | Dark | Down | 36.8 | 139.8 | Up | 04:40:03 - 04:50:06 | 3246 |
| North Lake | 04:45:03 | -36.6 | Dark | Down | 37.4 | 140.2 | Up | 04:40:01 - 04:50:04 | 3224 |
| Paisley | 04:45:01 | -37.0 | Dark | Down | 38.0 | 140.4 | Up | 04:40:00 - 04:50:03 | 3185 |
| Lakeview | 04:45:01 | -37.3 | Dark | Down | 38.5 | 140.3 | Up | 04:40:00 - 04:50:03 | 3146 |
| Chiloquin | 04:45:05 | -36.1 | Dark | Down | 37.5 | 138.8 | Up | 04:40:04 - 04:50:07 | 3138 |
| Klamath Falls | 04:45:05 | -36.2 | Dark | Down | 37.8 | 138.8 | Up | 04:40:04 - 04:50:07 | 3110 |
| Tulelake | 04:45:05 | -36.5 | Dark | Down | 38.1 | 139.0 | Up | 04:40:03 - 04:50:06 | 3094 |
| Cedarville | 04:45:01 | -37.5 | Dark | Down | 39.1 | 140.2 | Up | 04:39:59 - 04:50:02 | 3092 |
| Fall River/Burney | 04:45:05 | -36.8 | Dark | Down | 38.9 | 138.6 | Up | 04:40:03 - 04:50:06 | 3015 |
| Susanville | 04:45:02 | -37.5 | Dark | Down | 39.7 | 139.1 | Up | 04:40:01 - 04:50:04 | 2979 |
| Gimple | 04:45:03 | -37.4 | Dark | Down | 39.8 | 138.7 | Up | 04:40:01 - 04:50:04 | 2948 |
| Greenville | 04:45:03 | -37.3 | Dark | Down | 39.8 | 138.6 | Up | 04:40:02 - 04:50:05 | 2946 |
| Portola | 04:45:02 | -37.7 | Dark | Down | 40.2 | 138.9 | Up | 04:40:00 - 04:50:03 | 2929 |
| Quincy | 04:45:03 | -37.4 | Dark | Down | 39.9 | 138.5 | Up | 04:40:02 - 04:50:05 | 2927 |
| Reno | 04:45:00 | -38.3 | Dark | Down | 40.8 | 139.5 | Up | 04:39:58 - 04:50:01 | 2924 |
| Yerington | 04:44:58 | -38.9 | Dark | Down | 41.5 | 139.9 | Up | 04:39:56 - 04:49:59 | 2892 |
| Carson City | 04:45:00 | -38.4 | Dark | Down | 41.0 | 139.3 | Up | 04:39:58 - 04:50:01 | 2892 |
| Gardnerville | 04:45:00 | -38.5 | Dark | Down | 41.3 | 139.2 | Up | 04:39:58 - 04:50:01 | 2871 |
| Hawthorne | 04:44:56 | -39.4 | Dark | Down | 42.1 | 140.3 | Up | 04:39:55 - 04:49:58 | 2866 |
| Tonopah | 04:44:51 | -40.6 | Dark | Down | 43.2 | 141.7 | Up | 04:39:50 - 04:49:53 | 2865 |
| Lee Vining | 04:44:58 | -39.2 | Dark | Down | 42.3 | 139.4 | Up | 04:39:56 - 04:49:59 | 2799 |
| Indian Springs | 04:44:46 | -42.1 | Dark | Down | 45.1 | 142.6 | Up | 04:39:45 - 04:49:48 | 2776 |
| Beatty | 04:44:50 | -41.2 | Dark | Down | 44.3 | 141.5 | Up | 04:39:48 - 04:49:51 | 2773 |
| Bishop | 04:44:55 | -39.9 | Dark | Down | 43.1 | 139.9 | Up | 04:39:54 - 04:49:57 | 2766 |
| Henderson | 04:44:43 | -42.8 | Dark | Down | 45.9 | 143.1 | Up | 04:39:42 - 04:49:45 | 2748 |
| Patrick | 04:44:40 | -43.8 | Dark | Down | 46.9 | 144.2 | Up | 04:39:38 - 04:49:41 | 2725 |
| DCO | 04:44:36 | -44.4 | Dark | Down | 47.5 | 144.9 | Up | 04:39:35 - 04:49:38 | 2720 |
| Lone Pine | 04:44:54 | -40.3 | Dark | Down | 43.9 | 139.8 | Up | 04:39:53 - 04:49:56 | 2706 |
| Kingman/Dolan Springs | 04:44:40 | -43.7 | Dark | Down | 47.0 | 143.8 | Up | 04:39:38 - 04:49:41 | 2699 |
| Searchlight/Boulder City | 04:44:43 | -43.0 | Dark | Down | 46.3 | 142.9 | Up | 04:39:42 - 04:49:45 | 2697 |
| Laughlin/Bullhead City | 04:44:42 | -43.3 | Dark | Down | 46.7 | 143.1 | Up | 04:39:40 - 04:49:43 | 2681 |
| Mohave Valley | 04:44:42 | -43.4 | Dark | Down | 47.0 | 142.9 | Up | 04:39:40 - 04:49:43 | 2656 |
| Lake Havasu City | 04:44:41 | -43.7 | Dark | Down | 47.4 | 143.0 | Up | 04:39:39 - 04:49:42 | 2626 |
| Parker | 04:44:40 | -43.8 | Dark | Down | 47.7 | 142.8 | Up | 04:39:38 - 04:49:41 | 2594 |
| Blythe | 04:44:41 | -43.7 | Dark | Down | 48.0 | 142.1 | Up | 04:39:40 - 04:49:43 | 2536 |
| CPSLO | 04:45:02 | -38.5 | Dark | Down | 43.5 | 136.0 | Up | 04:40:01 - 04:50:04 | 2506 |
| Idyllwild | 04:44:48 | -41.9 | Dark | Down | 46.8 | 139.5 | Up | 04:39:47 - 04:49:50 | 2479 |
| Calipatria | 04:44:44 | -43.0 | Dark | Down | 47.9 | 140.5 | Up | 04:39:43 - 04:49:46 | 2459 |
| Wildwood | 04:44:55 | -40.3 | Dark | Down | 45.5 | 137.5 | Up | 04:39:54 - 04:49:57 | 2454 |
| Yuma | 04:44:41 | -43.8 | Dark | Down | 48.7 | 141.4 | Up | 04:39:39 - 04:49:42 | 2447 |
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 32532, (2018/02/09 04:42UT) Object RA Dec mag sep mel Sirius 06:45:08.2 -16:43:20 -1.5 23.92 132 15Rho Pup 08:07:32.5 -24:18:15 2.8 22.74 112 27 Mon 07:59:44.1 -03:40:47 4.9 2.06 123 28 Mon 08:01:13.4 -01:23:35 6.7 0.29 124 PPM 177240 08:01:29.8 -01:40:36 9.7 0.24 124 PPM 177230 08:00:07.8 -01:29:01 10.3 0.18 124 32532 08:00:33.1 -01:37:48 15.2 124 Positions are for J2000
Event circumstances last updated at 2018/02/05 17:12:14 UT
Marc W. Buie, Southwest Research Institute