Event between (531075) 12DY98 and star GA0860:04128717 with event index number of 1600631
Geocentric closest approach at 2019/12/31 12:36:34 UTC
J2000 position of star is 12:49:52.6 -03:45:34
Equinox of date position of star is 12:50:53.9 -03:52:02
Stellar brightness G=15.5,
use SENSEUP=128
Star is 147 degrees from the moon.
Moon is 26% illuminated.
TNO apparent brightness V=22.9
[RECON map]
TNO is 35.5 AU from the Sun
and 35.6 AU from the Earth.
The TNO is moving 7.7
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 269 seconds.
The 1-sigma cross-track error in the shadow position is
2036 km.
The sky-plane scale is
25795.8 km/arcsec.
The TNO has an absolute magnitude Hv=7.2
Diameter=218.8 km assuming a 5% albedo -- 28.2 sec chord
Diameter=89.3 km assuming a 30% albedo -- 11.5 sec chord
Dynamical classification is SCATNEAR
Star training set for 531075, (2019/12/31 12:37UT) Object RA Dec mag sep mel Spica 13:26:15.0 -11:15:54 1.0 11.46 136 38 Vir 12:54:12.7 -03:39:41 6.1 0.85 147 PPM 195867 12:50:12.0 -03:48:29 9.5 0.19 148 531075 12:50:54.5 -03:52:06 15.5 147 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 14.1 km
RECON observability=1.0 and success probability=8.5%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Clarence Fulton | 12:27:24 | -32.2 | Dark | Down | 31.8 | 149.9 | Up | 12:12:24 - 12:42:24 | 4169 |
| Kelowna | 12:27:23 | -32.3 | Dark | Down | 32.0 | 149.6 | Up | 12:12:23 - 12:42:23 | 4134 |
| Summerland | 12:27:21 | -32.5 | Dark | Down | 32.2 | 149.3 | Up | 12:12:21 - 12:42:21 | 4107 |
| Penticton | 12:27:18 | -32.4 | Dark | Down | 32.3 | 149.4 | Up | 12:12:18 - 12:42:18 | 4106 |
| Oliver | 12:27:23 | -32.4 | Dark | Down | 32.6 | 149.3 | Up | 12:12:23 - 12:42:23 | 4079 |
| Anarchist Mountain Observatory | 12:27:25 | -32.3 | Dark | Down | 32.8 | 149.5 | Up | 12:12:25 - 12:42:25 | 4074 |
| Tonasket | 12:27:20 | -32.3 | Dark | Down | 33.1 | 149.3 | Up | 12:12:20 - 12:42:20 | 4047 |
| Okanogan | 12:27:24 | -32.4 | Dark | Down | 33.3 | 149.0 | Up | 12:12:24 - 12:42:24 | 4015 |
| Niwot | 12:29:46 | -20.8 | Dark | Down | 45.1 | 165.0 | Up | 12:14:46 - 12:44:46 | 4004 |
| SwRI | 12:29:46 | -20.9 | Dark | Down | 45.2 | 164.8 | Up | 12:14:46 - 12:44:46 | 3991 |
| Brewster | 12:27:22 | -32.6 | Dark | Down | 33.5 | 148.7 | Up | 12:12:22 - 12:42:22 | 3987 |
| Manson/Chelan | 12:27:19 | -32.8 | Dark | Down | 33.5 | 148.2 | Up | 12:12:19 - 12:42:19 | 3956 |
| Entiat | 12:27:18 | -32.9 | Dark | Down | 33.7 | 148.0 | Up | 12:12:18 - 12:42:18 | 3936 |
| Wenatchee | 12:27:17 | -33.0 | Dark | Down | 33.8 | 147.8 | Up | 12:12:17 - 12:42:17 | 3912 |
| Victoria | 12:26:56 | -35.0 | Dark | Down | 31.7 | 144.7 | Up | 12:11:56 - 12:41:56 | 3885 |
| Ellensburg | 12:27:18 | -33.1 | Dark | Down | 34.1 | 147.4 | Up | 12:12:18 - 12:42:18 | 3872 |
| Pasco | 12:27:28 | -32.1 | Dark | Down | 35.3 | 148.8 | Up | 12:12:28 - 12:42:28 | 3868 |
| PNWRO | 12:27:32 | -31.9 | Dark | Down | 35.6 | 149.0 | Up | 12:12:32 - 12:42:32 | 3858 |
| Yakima | 12:27:18 | -33.1 | Dark | Down | 34.5 | 147.2 | Up | 12:12:18 - 12:42:18 | 3838 |
| Toppenish/White Swan | 12:27:16 | -33.0 | Dark | Down | 34.7 | 147.3 | Up | 12:12:16 - 12:42:16 | 3828 |
| Goldendale | 12:27:16 | -33.3 | Dark | Down | 35.0 | 146.7 | Up | 12:12:16 - 12:42:16 | 3767 |
| The Dalles | 12:27:14 | -33.6 | Dark | Down | 35.0 | 146.1 | Up | 12:12:14 - 12:42:14 | 3734 |
| Maupin | 12:27:15 | -33.5 | Dark | Down | 35.4 | 146.1 | Up | 12:12:15 - 12:42:15 | 3704 |
| Redmond | 12:27:16 | -33.6 | Dark | Down | 36.1 | 145.6 | Up | 12:12:16 - 12:42:16 | 3627 |
| Sisters | 12:27:12 | -33.9 | Dark | Down | 36.0 | 145.2 | Up | 12:12:12 - 12:42:12 | 3612 |
| Bend | 12:27:13 | -33.7 | Dark | Down | 36.3 | 145.4 | Up | 12:12:13 - 12:42:13 | 3604 |
| Oregon Observatory | 12:27:14 | -33.8 | Dark | Down | 36.3 | 145.2 | Up | 12:12:14 - 12:42:14 | 3584 |
| La Pine/Gilchrist | 12:27:14 | -33.8 | Dark | Down | 36.5 | 145.0 | Up | 12:12:14 - 12:42:14 | 3564 |
| North Lake | 12:27:18 | -33.3 | Dark | Down | 37.1 | 145.5 | Up | 12:12:18 - 12:42:18 | 3553 |
| Paisley | 12:27:21 | -33.1 | Dark | Down | 37.7 | 145.7 | Up | 12:12:21 - 12:42:21 | 3522 |
| Lakeview | 12:27:24 | -32.9 | Dark | Down | 38.2 | 145.7 | Up | 12:12:24 - 12:42:24 | 3488 |
| Cedarville | 12:27:28 | -32.7 | Dark | Down | 38.8 | 145.7 | Up | 12:12:28 - 12:42:28 | 3441 |
| Klamath Falls | 12:27:11 | -34.0 | Dark | Down | 37.6 | 144.0 | Up | 12:12:11 - 12:42:11 | 3431 |
| Fall River/Burney | 12:27:19 | -33.6 | Dark | Down | 38.7 | 144.0 | Up | 12:12:19 - 12:42:19 | 3348 |
| Susanville | 12:27:24 | -33.0 | Dark | Down | 39.5 | 144.6 | Up | 12:12:24 - 12:42:24 | 3326 |
| Gimple | 12:27:24 | -33.2 | Dark | Down | 39.7 | 144.2 | Up | 12:12:24 - 12:42:24 | 3293 |
| Greenville | 12:27:24 | -33.2 | Dark | Down | 39.6 | 144.1 | Up | 12:12:24 - 12:42:24 | 3290 |
| Reno | 12:27:34 | -32.3 | Dark | Down | 40.6 | 145.2 | Up | 12:12:34 - 12:42:34 | 3289 |
| Portola | 12:27:28 | -32.8 | Dark | Down | 40.1 | 144.5 | Up | 12:12:28 - 12:42:28 | 3283 |
| Tonopah | 12:27:57 | -30.0 | Dark | Down | 43.0 | 147.7 | Up | 12:12:57 - 12:42:57 | 3281 |
| Quincy | 12:27:24 | -33.2 | Dark | Down | 39.8 | 144.0 | Up | 12:12:24 - 12:42:24 | 3273 |
| Yerington | 12:27:42 | -31.7 | Dark | Down | 41.4 | 145.7 | Up | 12:12:42 - 12:42:42 | 3271 |
| Carson City | 12:27:32 | -32.2 | Dark | Down | 40.9 | 145.0 | Up | 12:12:32 - 12:42:32 | 3259 |
| Hawthorne | 12:27:48 | -31.2 | Dark | Down | 42.0 | 146.1 | Up | 12:12:48 - 12:42:48 | 3256 |
| Gardnerville | 12:27:34 | -32.2 | Dark | Down | 41.2 | 144.9 | Up | 12:12:34 - 12:42:34 | 3241 |
| Indian Springs | 12:28:18 | -28.6 | Dark | Down | 45.0 | 149.0 | Up | 12:13:18 - 12:43:18 | 3227 |
| DCO | 12:28:49 | -26.2 | Dark | Down | 47.3 | 151.7 | Up | 12:13:49 - 12:43:49 | 3225 |
| Patrick | 12:28:42 | -26.8 | Dark | Down | 46.8 | 150.9 | Up | 12:13:42 - 12:43:42 | 3216 |
| Henderson | 12:28:25 | -27.9 | Dark | Down | 45.7 | 149.6 | Up | 12:13:25 - 12:43:25 | 3215 |
| Beatty | 12:28:05 | -29.5 | Dark | Down | 44.2 | 147.7 | Up | 12:13:05 - 12:43:05 | 3204 |
| Kingman/Dolan Springs | 12:28:35 | -27.0 | Dark | Down | 46.9 | 150.5 | Up | 12:13:35 - 12:43:35 | 3188 |
| Lee Vining | 12:27:43 | -31.6 | Dark | Down | 42.3 | 145.2 | Up | 12:12:43 - 12:42:43 | 3185 |
| George/Scottsdale | 12:29:05 | -24.8 | Dark | Down | 49.1 | 152.9 | Up | 12:14:05 - 12:44:05 | 3172 |
| Searchlight/Boulder City | 12:28:28 | -27.7 | Dark | Down | 46.3 | 149.4 | Up | 12:13:28 - 12:43:28 | 3169 |
| Bishop | 12:27:51 | -30.9 | Dark | Down | 43.1 | 145.8 | Up | 12:12:51 - 12:42:51 | 3167 |
| Laughlin/Bullhead City | 12:28:32 | -27.4 | Dark | Down | 46.7 | 149.8 | Up | 12:13:32 - 12:43:32 | 3160 |
| Mohave Valley | 12:28:33 | -27.3 | Dark | Down | 46.9 | 149.6 | Up | 12:13:33 - 12:43:33 | 3138 |
| Lake Havasu City | 12:28:35 | -27.1 | Dark | Down | 47.4 | 149.8 | Up | 12:13:35 - 12:43:35 | 3116 |
| Parker | 12:28:39 | -27.0 | Dark | Down | 47.7 | 149.6 | Up | 12:13:39 - 12:43:39 | 3087 |
| Blythe | 12:28:38 | -27.1 | Dark | Down | 48.0 | 148.9 | Up | 12:13:38 - 12:43:38 | 3028 |
| Yuma | 12:28:42 | -26.9 | Dark | Down | 48.8 | 148.3 | Up | 12:13:42 - 12:43:42 | 2946 |
| Calipatria | 12:28:32 | -27.8 | Dark | Down | 48.0 | 147.3 | Up | 12:13:32 - 12:43:32 | 2939 |
| Idyllwild | 12:28:18 | -28.9 | Dark | Down | 46.9 | 146.1 | Up | 12:13:18 - 12:43:18 | 2934 |
| CPSLO | 12:27:39 | -32.5 | Dark | Down | 43.7 | 141.9 | Up | 12:12:39 - 12:42:39 | 2883 |
| Wildwood | 12:28:02 | -30.6 | Dark | Down | 45.7 | 143.8 | Up | 12:13:02 - 12:43:02 | 2874 |
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 531075, (2019/12/31 12:37UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 11.46 136 38 Vir 12:53:10.8 -03:33:11 6.1 0.85 147 PPM 195867 12:49:10.1 -03:41:58 9.5 0.19 148 531075 12:49:52.6 -03:45:34 15.5 147 Positions are for J2000
Event circumstances last updated at 2019/10/23 19:20:07 UT
Marc W. Buie, Southwest Research Institute