Event between (50000) Quaoar and star GA0740:17105422 with event index number of 1124921
Geocentric closest approach at 2021/08/03 05:52:42 UTC
J2000 position of star is 18:16:34.9 -15:15:24
Equinox of date position of star is 18:17:48.0 -15:14:52
Stellar brightness G=15.2,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 155 degrees from the moon.
Moon is 26% illuminated.
TNO apparent brightness V=18.9
[RECON map]
TNO is 42.8 AU from the Sun
and 42.0 AU from the Earth.
The TNO is moving 18.9
km/sec on the sky relative to the star, or,
2.2 arcsec/hr.
The 1-sigma error in the time of the event is 117 seconds.
The 1-sigma cross-track error in the shadow position is
1579 km.
The sky-plane scale is
30441.7 km/arcsec.
The TNO has an absolute magnitude Hv=2.5
Diameter=1896.8 km assuming a 5% albedo -- 100.1 sec chord
Diameter=774.4 km assuming a 30% albedo -- 40.9 sec chord
Dynamical classification is CLASSICAL
Star training set for 50000, (2021/08/03 05:53UT) Object RA Dec mag sep mel Antares 16:30:44.1 -26:28:41 0.9 27.34 176 Nunki 18:56:36.1 -26:16:05 2.0 14.26 148 PPM 234386 18:21:23.4 -15:49:16 5.2 1.03 154 PPM 234301 18:18:52.0 -15:25:16 7.3 0.31 155 50000 18:17:49.1 -15:14:52 15.2 155 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 14.9 km
RECON observability=1.0 and success probability=0.0%
| 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 | 05:51:32 | -16.3 | AT | Down | 24.2 | 186.8 | Low | 05:41:19 - 06:01:45 | 8886 |
| Kelowna | 05:51:33 | -16.6 | AT | Down | 24.6 | 186.7 | Low | 05:41:20 - 06:01:46 | 8869 |
| Peachland | 05:51:33 | -16.6 | AT | Down | 24.8 | 186.4 | Low | 05:41:20 - 06:01:46 | 8868 |
| Summerland | 05:51:32 | -16.8 | AT | Down | 24.9 | 186.5 | Low | 05:41:19 - 06:01:45 | 8859 |
| Penticton | 05:51:34 | -16.9 | AT | Down | 25.0 | 186.6 | Low | 05:41:21 - 06:01:47 | 8855 |
| Victoria | 05:51:47 | -16.3 | AT | Down | 26.2 | 182.6 | Low | 05:41:34 - 06:02:00 | 8855 |
| Oliver | 05:51:32 | -17.2 | AT | Down | 25.3 | 186.6 | Low | 05:41:19 - 06:01:45 | 8838 |
| Anarchist Mountain Observatory | 05:51:32 | -17.4 | AT | Down | 25.5 | 186.9 | Low | 05:41:19 - 06:01:45 | 8827 |
| Tonasket | 05:51:32 | -17.6 | AT | Down | 25.8 | 186.8 | Low | 05:41:19 - 06:01:45 | 8812 |
| Okanogan | 05:51:34 | -17.8 | AT | Down | 26.1 | 186.7 | Low | 05:41:21 - 06:01:47 | 8797 |
| Brewster | 05:51:34 | -18.0 | AT | Down | 26.4 | 186.5 | Low | 05:41:21 - 06:01:47 | 8786 |
| Manson/Chelan | 05:51:35 | -18.0 | Dark | Down | 26.7 | 186.1 | Low | 05:41:22 - 06:01:48 | 8781 |
| Wenatchee | 05:51:36 | -18.4 | Dark | Down | 27.1 | 185.9 | Low | 05:41:23 - 06:01:49 | 8759 |
| Ellensburg | 05:51:37 | -18.6 | Dark | Down | 27.6 | 185.7 | Low | 05:41:24 - 06:01:50 | 8741 |
| Yakima | 05:51:36 | -18.9 | Dark | Down | 28.0 | 185.7 | Low | 05:41:23 - 06:01:49 | 8719 |
| Toppenish/White Swan | 05:51:35 | -19.2 | Dark | Down | 28.2 | 185.9 | Low | 05:41:22 - 06:01:48 | 8705 |
| Goldendale | 05:51:36 | -19.5 | Dark | Down | 28.8 | 185.5 | Low | 05:41:23 - 06:01:49 | 8682 |
| Pasco | 05:51:29 | -19.8 | Dark | Down | 28.2 | 187.3 | Low | 05:41:16 - 06:01:42 | 8681 |
| The Dalles | 05:51:39 | -19.5 | Dark | Down | 29.0 | 185.1 | Low | 05:41:26 - 06:01:52 | 8674 |
| PNWRO | 05:51:30 | -20.1 | Dark | Down | 28.4 | 187.5 | Low | 05:41:17 - 06:01:43 | 8664 |
| Maupin | 05:51:38 | -19.9 | Dark | Down | 29.4 | 185.2 | Low | 05:41:25 - 06:01:51 | 8650 |
| Sisters | 05:51:40 | -20.4 | Dark | Down | 30.3 | 184.7 | Up | 05:41:27 - 06:01:53 | 8608 |
| Redmond | 05:51:38 | -20.6 | Dark | Down | 30.3 | 185.2 | Up | 05:41:25 - 06:01:51 | 8601 |
| Bend | 05:51:39 | -20.7 | Dark | Down | 30.5 | 185.0 | Up | 05:41:26 - 06:01:52 | 8591 |
| Oregon Observatory | 05:51:41 | -20.8 | Dark | Down | 30.7 | 184.9 | Up | 05:41:28 - 06:01:54 | 8583 |
| La Pine/Gilchrist | 05:51:41 | -20.9 | Dark | Down | 30.9 | 184.8 | Up | 05:41:28 - 06:01:54 | 8572 |
| North Lake | 05:51:39 | -21.5 | Dark | Down | 31.3 | 185.5 | Up | 05:41:26 - 06:01:52 | 8539 |
| Chiloquin | 05:51:42 | -21.7 | Dark | Down | 32.1 | 184.5 | Up | 05:41:29 - 06:01:55 | 8512 |
| Paisley | 05:51:37 | -22.1 | Dark | Down | 31.8 | 186.0 | Up | 05:41:24 - 06:01:50 | 8501 |
| Klamath Falls | 05:51:43 | -22.0 | Dark | Down | 32.4 | 184.6 | Up | 05:41:30 - 06:01:56 | 8491 |
| Lakeview | 05:51:37 | -22.6 | Dark | Down | 32.3 | 186.2 | Up | 05:41:24 - 06:01:50 | 8468 |
| Cedarville | 05:51:36 | -23.3 | Dark | Down | 33.0 | 186.5 | Up | 05:41:23 - 06:01:49 | 8425 |
| Fall River/Burney | 05:51:41 | -23.1 | Dark | Down | 33.5 | 185.1 | Up | 05:41:28 - 06:01:54 | 8413 |
| Susanville | 05:51:38 | -23.9 | Dark | Down | 34.1 | 186.0 | Up | 05:41:25 - 06:01:51 | 8363 |
| Greenville | 05:51:40 | -24.0 | Dark | Down | 34.4 | 185.7 | Up | 05:41:27 - 06:01:53 | 8350 |
| Gimple | 05:51:39 | -24.1 | Dark | Down | 34.4 | 185.8 | Up | 05:41:26 - 06:01:52 | 8349 |
| Quincy | 05:51:40 | -24.2 | Dark | Down | 34.6 | 185.7 | Up | 05:41:27 - 06:01:53 | 8337 |
| Portola | 05:51:37 | -24.5 | Dark | Down | 34.7 | 186.3 | Up | 05:41:24 - 06:01:50 | 8322 |
| Reno | 05:51:34 | -25.0 | Dark | Down | 34.9 | 187.0 | Up | 05:41:21 - 06:01:47 | 8295 |
| Carson City | 05:51:34 | -25.3 | Dark | Down | 35.3 | 187.1 | Up | 05:41:21 - 06:01:47 | 8271 |
| Gardnerville | 05:51:35 | -25.5 | Dark | Down | 35.5 | 187.2 | Up | 05:41:22 - 06:01:48 | 8255 |
| Yerington | 05:51:32 | -25.8 | Dark | Down | 35.4 | 187.8 | Up | 05:41:19 - 06:01:45 | 8249 |
| Hawthorne | 05:51:30 | -26.4 | Dark | Down | 35.8 | 188.5 | Up | 05:41:17 - 06:01:43 | 8210 |
| Lee Vining | 05:51:31 | -26.6 | Dark | Down | 36.4 | 188.0 | Up | 05:41:18 - 06:01:44 | 8180 |
| Tonopah | 05:51:23 | -27.4 | Dark | Down | 36.1 | 190.2 | Up | 05:41:10 - 06:01:36 | 8155 |
| Bishop | 05:51:28 | -27.4 | Dark | Down | 36.9 | 188.9 | Up | 05:41:15 - 06:01:41 | 8128 |
| Dunrhomin | 05:50:32 | -29.6 | Dark | Down | 31.3 | 203.1 | Up | 05:40:19 - 06:00:45 | 8079 |
| Beatty | 05:51:21 | -28.5 | Dark | Down | 37.2 | 190.9 | Up | 05:41:08 - 06:01:34 | 8068 |
| Indian Springs | 05:51:16 | -29.3 | Dark | Down | 37.3 | 192.2 | Up | 05:41:03 - 06:01:29 | 8026 |
| CPSLO | 05:51:39 | -28.0 | Dark | Down | 39.2 | 186.4 | Up | 05:41:26 - 06:01:52 | 8021 |
| Henderson | 05:51:13 | -30.0 | Dark | Down | 37.7 | 193.1 | Up | 05:41:00 - 06:01:26 | 7976 |
| Patrick | 05:51:08 | -31.0 | Dark | Down | 38.1 | 194.5 | Up | 05:40:55 - 06:01:21 | 7911 |
| Laughlin/Bullhead City | 05:51:12 | -30.9 | Dark | Down | 38.5 | 193.7 | Up | 05:40:59 - 06:01:25 | 7906 |
| Wildwood | 05:51:30 | -30.0 | Dark | Down | 40.2 | 189.1 | Up | 05:41:17 - 06:01:43 | 7900 |
| Kingman/Dolan Springs | 05:51:09 | -31.1 | Dark | Down | 38.4 | 194.4 | Up | 05:40:56 - 06:01:22 | 7899 |
| Mohave Valley | 05:51:12 | -31.2 | Dark | Down | 38.7 | 193.8 | Up | 05:40:59 - 06:01:25 | 7886 |
| Lake Havasu City | 05:51:12 | -31.6 | Dark | Down | 39.1 | 194.2 | Up | 05:40:59 - 06:01:25 | 7853 |
| Idyllwild | 05:51:21 | -31.2 | Dark | Down | 40.3 | 191.4 | Up | 05:41:08 - 06:01:34 | 7842 |
| Parker | 05:51:10 | -31.9 | Dark | Down | 39.4 | 194.3 | Up | 05:40:57 - 06:01:23 | 7826 |
| Blythe | 05:51:12 | -32.2 | Dark | Down | 40.0 | 194.0 | Up | 05:40:59 - 06:01:25 | 7793 |
| Calipatria | 05:51:16 | -32.2 | Dark | Down | 40.6 | 193.0 | Up | 05:41:03 - 06:01:29 | 7774 |
| George/Scottsdale | 05:50:59 | -33.3 | Dark | Down | 39.3 | 197.3 | Up | 05:40:46 - 06:01:12 | 7748 |
| Yuma | 05:51:12 | -33.0 | Dark | Down | 40.9 | 194.2 | Up | 05:40:59 - 06:01:25 | 7724 |
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 50000, (2021/08/03 05:53UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 27.34 176 Nunki 18:55:15.9 -26:17:49 2.0 14.26 148 PPM 234386 18:20:08.9 -15:49:55 5.2 1.03 154 PPM 234301 18:17:37.7 -15:25:50 7.3 0.31 155 50000 18:16:34.9 -15:15:24 15.2 155 Positions are for J2000
Event circumstances last updated at 2021/04/08 23:42:30 UT
Marc W. Buie, Southwest Research Institute