Event between (506121) 16BP81 and star UC4-493-002105 with event index number of 229127
Geocentric closest approach at 2019/10/21 04:23:06 UTC
J2000 position of star is 01:26:14.9 +08:35:21
Equinox of date position of star is 01:27:11.4 +08:40:55
Stellar brightness R=15.3,
use SENSEUP=128
Star is 90 degrees from the moon.
Moon is 54% illuminated.
TNO apparent brightness V=22.5
[RECON map]
TNO is 42.9 AU from the Sun
and 41.9 AU from the Earth.
The TNO is moving 25.2
km/sec on the sky relative to the star, or,
3.0 arcsec/hr.
The 1-sigma error in the time of the event is 193 seconds.
The 1-sigma cross-track error in the shadow position is
3370 km.
The sky-plane scale is
30396.0 km/arcsec.
The TNO has an absolute magnitude Hv=6.2
Diameter=346.7 km assuming a 5% albedo -- 13.7 sec chord
Diameter=141.6 km assuming a 30% albedo -- 5.6 sec chord
Dynamical classification is CLASSICAL
Star training set for 506121, (2019/10/21 04:23UT) Object RA Dec mag sep mel Aldebaran 04:37:03.6 +16:32:51 0.8 46.85 44 6Bet Ari 01:55:44.3 +20:54:15 2.6 14.01 79 PPM 144653 01:30:05.3 +07:23:45 6.4 1.47 90 PPM 144642 01:29:25.4 +08:03:49 7.2 0.82 90 PPM 144648 01:29:41.2 +08:31:17 9.3 0.62 90 PPM 144637 01:28:46.9 +08:52:55 10.4 0.42 90 506121 01:27:17.3 +08:41:29 15.3 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
4.7 sigma about the mid-time.
The median site spacing is 16.1 km
RECON observability=1.0 and success probability=3.2%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Oroville | 04:23:59 | -33.8 | Dark | Down | 34.5 | 120.9 | Up | 04:08:59 - 04:38:59 | 7978 |
| Tonasket | 04:23:59 | -33.9 | Dark | Down | 34.6 | 120.7 | Up | 04:08:59 - 04:38:59 | 7965 |
| Okanogan | 04:24:01 | -34.0 | Dark | Down | 34.7 | 120.4 | Up | 04:09:01 - 04:39:01 | 7950 |
| Brewster | 04:24:02 | -34.0 | Dark | Down | 34.7 | 120.0 | Up | 04:09:02 - 04:39:02 | 7940 |
| Manson/Chelan | 04:24:03 | -33.9 | Dark | Down | 34.6 | 119.6 | Up | 04:09:03 - 04:39:03 | 7938 |
| Entiat | 04:24:04 | -33.9 | Dark | Down | 34.7 | 119.4 | Up | 04:09:04 - 04:39:04 | 7928 |
| Wenatchee | 04:24:05 | -34.0 | Dark | Down | 34.8 | 119.1 | Up | 04:09:05 - 04:39:05 | 7916 |
| Ellensburg | 04:24:07 | -34.0 | Dark | Down | 34.8 | 118.7 | Up | 04:09:07 - 04:39:07 | 7898 |
| Yakima | 04:24:08 | -34.1 | Dark | Down | 35.0 | 118.4 | Up | 04:09:08 - 04:39:08 | 7875 |
| Toppenish/White Swan | 04:24:08 | -34.3 | Dark | Down | 35.2 | 118.4 | Up | 04:09:08 - 04:39:08 | 7858 |
| Goldendale | 04:24:11 | -34.3 | Dark | Down | 35.2 | 117.7 | Up | 04:09:11 - 04:39:11 | 7837 |
| The Dalles | 04:24:12 | -34.1 | Dark | Down | 35.1 | 117.2 | Up | 04:09:12 - 04:39:12 | 7834 |
| Pasco | 04:24:07 | -35.2 | Dark | Down | 36.1 | 119.6 | Up | 04:09:07 - 04:39:07 | 7817 |
| Maupin | 04:24:14 | -34.4 | Dark | Down | 35.4 | 117.1 | Up | 04:09:14 - 04:39:14 | 7806 |
| George/Umatilla | 04:24:09 | -35.2 | Dark | Down | 36.1 | 119.2 | Up | 04:09:09 - 04:39:09 | 7804 |
| PNWRO | 04:24:07 | -35.4 | Dark | Down | 36.3 | 119.6 | Up | 04:09:07 - 04:39:07 | 7797 |
| Madras/Culver | 04:24:15 | -34.5 | Dark | Down | 35.6 | 116.7 | Up | 04:09:15 - 04:39:15 | 7775 |
| Sisters | 04:24:15 | -34.4 | Dark | Down | 35.5 | 116.0 | Up | 04:09:15 - 04:39:15 | 7767 |
| Redmond | 04:24:15 | -34.6 | Dark | Down | 35.7 | 116.4 | Up | 04:09:15 - 04:39:15 | 7755 |
| Bend | 04:24:15 | -34.6 | Dark | Down | 35.7 | 116.1 | Up | 04:09:15 - 04:39:15 | 7746 |
| Oregon Observatory | 04:24:15 | -34.6 | Dark | Down | 35.7 | 115.9 | Up | 04:09:15 - 04:39:15 | 7739 |
| La Pine/Gilchrist | 04:24:15 | -34.6 | Dark | Down | 35.8 | 115.7 | Up | 04:09:15 - 04:39:15 | 7728 |
| North Lake | 04:24:15 | -35.2 | Dark | Down | 36.4 | 116.0 | Up | 04:09:15 - 04:39:15 | 7685 |
| Chiloquin | 04:24:15 | -34.8 | Dark | Down | 36.0 | 114.6 | Up | 04:09:15 - 04:39:15 | 7671 |
| Klamath Falls | 04:24:15 | -34.9 | Dark | Down | 36.2 | 114.5 | Up | 04:09:15 - 04:39:15 | 7648 |
| Paisley | 04:24:15 | -35.6 | Dark | Down | 36.8 | 115.9 | Up | 04:09:15 - 04:39:15 | 7640 |
| Tulelake | 04:24:15 | -35.2 | Dark | Down | 36.5 | 114.6 | Up | 04:09:15 - 04:39:15 | 7623 |
| Lakeview | 04:24:15 | -35.9 | Dark | Down | 37.2 | 115.8 | Up | 04:09:15 - 04:39:15 | 7603 |
| Fall River/Burney | 04:24:15 | -35.6 | Dark | Down | 37.0 | 114.0 | Up | 04:09:15 - 04:39:15 | 7564 |
| Cedarville | 04:24:15 | -36.3 | Dark | Down | 37.6 | 115.5 | Up | 04:09:15 - 04:39:15 | 7557 |
| Susanville | 04:24:15 | -36.3 | Dark | Down | 37.7 | 114.3 | Up | 04:09:15 - 04:39:15 | 7502 |
| Greenville | 04:24:15 | -36.2 | Dark | Down | 37.6 | 113.8 | Up | 04:09:15 - 04:39:15 | 7494 |
| Gimple | 04:24:15 | -36.3 | Dark | Down | 37.7 | 113.9 | Up | 04:09:15 - 04:39:15 | 7491 |
| Quincy | 04:24:15 | -36.3 | Dark | Down | 37.7 | 113.7 | Up | 04:09:15 - 04:39:15 | 7481 |
| Portola | 04:24:15 | -36.7 | Dark | Down | 38.1 | 114.0 | Up | 04:09:15 - 04:39:15 | 7458 |
| Reno | 04:24:15 | -37.2 | Dark | Down | 38.7 | 114.4 | Up | 04:09:15 - 04:39:15 | 7420 |
| Carson City | 04:24:15 | -37.4 | Dark | Down | 38.8 | 114.1 | Up | 04:09:15 - 04:39:15 | 7396 |
| Gardnerville | 04:24:15 | -37.5 | Dark | Down | 39.0 | 114.0 | Up | 04:09:15 - 04:39:15 | 7379 |
| Yerington | 04:24:15 | -37.9 | Dark | Down | 39.4 | 114.6 | Up | 04:09:15 - 04:39:15 | 7363 |
| Hawthorne | 04:24:15 | -38.4 | Dark | Down | 39.9 | 114.7 | Up | 04:09:15 - 04:39:15 | 7315 |
| Lee Vining | 04:24:15 | -38.2 | Dark | Down | 39.8 | 113.8 | Up | 04:09:15 - 04:39:15 | 7294 |
| Tonopah | 04:24:15 | -39.6 | Dark | Down | 41.1 | 115.6 | Up | 04:09:15 - 04:39:15 | 7236 |
| Bishop | 04:24:34 | -39.0 | Dark | Down | 40.6 | 114.1 | Up | 04:09:34 - 04:39:34 | 7215 |
| Lone Pine | 04:24:35 | -39.5 | Dark | Down | 41.2 | 113.8 | Up | 04:09:35 - 04:39:35 | 7149 |
| Beatty | 04:24:15 | -40.4 | Dark | Down | 42.0 | 115.1 | Up | 04:09:15 - 04:39:15 | 7142 |
| CPSLO | 04:24:44 | -37.9 | Dark | Down | 39.8 | 110.6 | Up | 04:09:44 - 04:39:44 | 7136 |
| Indian Springs | 04:24:15 | -41.3 | Dark | Down | 42.9 | 115.8 | Up | 04:09:15 - 04:39:15 | 7082 |
| Henderson | 04:24:15 | -42.0 | Dark | Down | 43.6 | 116.0 | Up | 04:09:15 - 04:39:15 | 7020 |
| Niwot | 04:23:54 | -47.0 | Dark | Down | 47.9 | 129.8 | Up | 04:08:54 - 04:38:54 | 6997 |
| Wildwood | 04:24:44 | -39.9 | Dark | Down | 41.8 | 111.3 | Up | 04:09:44 - 04:39:44 | 6980 |
| Searchlight/Boulder City | 04:24:15 | -42.2 | Dark | Down | 43.9 | 115.6 | Up | 04:09:15 - 04:39:15 | 6977 |
| Laughlin/Bullhead City | 04:24:15 | -42.6 | Dark | Down | 44.3 | 115.6 | Up | 04:09:15 - 04:39:15 | 6943 |
| Patrick | 04:24:15 | -43.1 | Dark | Down | 44.7 | 116.5 | Up | 04:09:15 - 04:39:15 | 6935 |
| Kingman/Dolan Springs | 04:24:15 | -43.0 | Dark | Down | 44.7 | 116.1 | Up | 04:09:15 - 04:39:15 | 6926 |
| Mohave Valley | 04:24:15 | -42.7 | Dark | Down | 44.4 | 115.4 | Up | 04:09:15 - 04:39:15 | 6924 |
| Idyllwild | 04:24:41 | -41.5 | Dark | Down | 43.4 | 112.6 | Up | 04:09:41 - 04:39:41 | 6891 |
| DCO | 04:24:15 | -43.7 | Dark | Down | 45.4 | 116.9 | Up | 04:09:15 - 04:39:15 | 6888 |
| Lake Havasu City | 04:24:15 | -43.0 | Dark | Down | 44.8 | 115.3 | Up | 04:09:15 - 04:39:15 | 6886 |
| Parker | 04:24:34 | -43.2 | Dark | Down | 45.0 | 115.0 | Up | 04:09:34 - 04:39:34 | 6843 |
| Blythe | 04:24:36 | -43.2 | Dark | Down | 45.0 | 114.3 | Up | 04:09:36 - 04:39:36 | 6812 |
| Calipatria | 04:24:39 | -42.6 | Dark | Down | 44.5 | 113.0 | Up | 04:09:39 - 04:39:39 | 6805 |
| Yuma | 04:24:39 | -43.5 | Dark | Down | 45.4 | 113.4 | Up | 04:09:39 - 04:39:39 | 6741 |
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 506121, (2019/10/21 04:23UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:30 0.8 46.85 44 6Bet Ari 01:54:38.5 +20:48:27 2.6 14.01 79 PPM 144653 01:29:03.1 +07:17:38 6.4 1.47 90 PPM 144642 01:28:23.1 +07:57:42 7.2 0.82 90 PPM 144648 01:28:38.8 +08:25:10 9.3 0.62 90 PPM 144637 01:27:44.4 +08:46:47 10.4 0.42 90 506121 01:26:14.9 +08:35:21 15.3 90 Positions are for J2000
Event circumstances last updated at 2017/12/06 19:25:47 UT
Marc W. Buie, Southwest Research Institute