Event between 01KO77 and star GA0740:14740348 with event index number of 1913784
Geocentric closest approach at 2021/07/31 04:13:55 UTC
J2000 position of star is 18:00:21.4 -14:00:17
Equinox of date position of star is 18:01:34.2 -14:00:15
Stellar brightness G=16.7,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 124 degrees from the moon.
Moon is 54% illuminated.
TNO apparent brightness V=23.4
[RECON map]
TNO is 37.6 AU from the Sun
and 36.8 AU from the Earth.
The TNO is moving 18.2
km/sec on the sky relative to the star, or,
2.5 arcsec/hr.
The 1-sigma error in the time of the event is 708 seconds.
The 1-sigma cross-track error in the shadow position is
4838 km.
The sky-plane scale is
26680.2 km/arcsec.
The TNO has an absolute magnitude Hv=7.6
Diameter=184.5 km assuming a 5% albedo -- 10.2 sec chord
Diameter=75.3 km assuming a 30% albedo -- 4.1 sec chord
Dynamical classification is SCATEXTD
Star training set for 01KO77, (2021/07/31 04:14UT) Object RA Dec mag sep mel Antares 16:30:44.0 -26:28:41 0.9 24.63 144 35Eta Oph 17:11:37.0 -15:45:00 2.6 12.20 136 PPM 233766 17:57:33.6 -15:48:52 6.1 2.05 125 PPM 233881 18:01:34.2 -14:12:27 7.8 0.20 124 01KO77 18:01:34.9 -14:00:15 16.7 124 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
1.3 sigma about the mid-time.
The median site spacing is 25.2 km
RECON observability=0.2 and success probability=1.7%
| 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 | 04:14:37 | -5.1 | CT | Down | 24.1 | 162.2 | Low | 03:59:37 - 04:29:37 | 7838 |
| Kelowna | 04:14:38 | -5.2 | CT | Down | 24.4 | 162.0 | Low | 03:59:38 - 04:29:38 | 7819 |
| Peachland | 04:14:40 | -5.1 | CT | Down | 24.5 | 161.7 | Low | 03:59:40 - 04:29:40 | 7814 |
| Summerland | 04:14:40 | -5.3 | CT | Down | 24.6 | 161.7 | Low | 03:59:40 - 04:29:40 | 7807 |
| Penticton | 04:14:39 | -5.4 | CT | Down | 24.7 | 161.8 | Low | 03:59:39 - 04:29:39 | 7804 |
| Oliver | 04:14:40 | -5.6 | CT | Down | 25.1 | 161.8 | Low | 03:59:40 - 04:29:40 | 7786 |
| Anarchist Mountain Observatory | 04:14:39 | -5.8 | CT | Down | 25.3 | 162.0 | Low | 03:59:39 - 04:29:39 | 7779 |
| Tonasket | 04:14:39 | -5.9 | CT | Down | 25.5 | 161.8 | Low | 03:59:39 - 04:29:39 | 7763 |
| Victoria | 04:14:55 | -3.9 | CT | Down | 24.8 | 157.7 | Low | 03:59:55 - 04:29:55 | 7751 |
| Okanogan | 04:14:41 | -6.0 | NT | Down | 25.8 | 161.6 | Low | 03:59:41 - 04:29:41 | 7746 |
| Brewster | 04:14:42 | -6.1 | NT | Down | 26.0 | 161.4 | Low | 03:59:42 - 04:29:42 | 7732 |
| Manson/Chelan | 04:14:44 | -6.0 | NT | Down | 26.2 | 161.0 | Low | 03:59:44 - 04:29:44 | 7721 |
| Wenatchee | 04:14:46 | -6.2 | NT | Down | 26.6 | 160.7 | Low | 03:59:46 - 04:29:46 | 7697 |
| Ellensburg | 04:14:46 | -6.3 | NT | Down | 26.9 | 160.4 | Low | 03:59:46 - 04:29:46 | 7675 |
| Yakima | 04:14:48 | -6.6 | NT | Down | 27.3 | 160.3 | Low | 03:59:48 - 04:29:48 | 7653 |
| Toppenish/White Swan | 04:14:48 | -6.8 | NT | Down | 27.5 | 160.5 | Low | 03:59:48 - 04:29:48 | 7642 |
| Pasco | 04:14:42 | -7.6 | NT | Down | 27.9 | 161.8 | Low | 03:59:42 - 04:29:42 | 7635 |
| PNWRO | 04:14:42 | -7.8 | NT | Down | 28.2 | 162.0 | Low | 03:59:42 - 04:29:42 | 7622 |
| Goldendale | 04:14:50 | -6.9 | NT | Down | 28.0 | 159.9 | Low | 03:59:50 - 04:29:50 | 7612 |
| The Dalles | 04:14:51 | -6.8 | NT | Down | 28.1 | 159.5 | Low | 03:59:51 - 04:29:51 | 7599 |
| Maupin | 04:14:51 | -7.1 | NT | Down | 28.5 | 159.6 | Low | 03:59:51 - 04:29:51 | 7576 |
| Sisters | 04:14:56 | -7.3 | NT | Down | 29.2 | 158.9 | Low | 03:59:56 - 04:29:56 | 7526 |
| Redmond | 04:14:54 | -7.6 | NT | Down | 29.3 | 159.3 | Low | 03:59:54 - 04:29:54 | 7525 |
| Bend | 04:14:55 | -7.6 | NT | Down | 29.5 | 159.1 | Low | 03:59:55 - 04:29:55 | 7513 |
| Oregon Observatory | 04:14:55 | -7.6 | NT | Down | 29.6 | 158.9 | Low | 03:59:55 - 04:29:55 | 7503 |
| La Pine/Gilchrist | 04:14:55 | -7.7 | NT | Down | 29.8 | 158.8 | Low | 03:59:55 - 04:29:55 | 7491 |
| North Lake | 04:14:55 | -8.3 | NT | Down | 30.4 | 159.4 | Up | 03:59:55 - 04:29:55 | 7466 |
| Paisley | 04:14:53 | -8.8 | NT | Down | 31.0 | 159.7 | Up | 03:59:53 - 04:29:53 | 7433 |
| Chiloquin | 04:14:59 | -8.1 | NT | Down | 30.7 | 158.2 | Up | 03:59:59 - 04:29:59 | 7424 |
| Klamath Falls | 04:15:00 | -8.4 | NT | Down | 31.1 | 158.2 | Up | 04:00:00 - 04:30:00 | 7404 |
| Lakeview | 04:14:53 | -9.2 | NT | Down | 31.5 | 159.8 | Up | 03:59:53 - 04:29:53 | 7402 |
| Cedarville | 04:14:53 | -9.7 | NT | Down | 32.2 | 159.8 | Up | 03:59:53 - 04:29:53 | 7362 |
| Fall River/Burney | 04:14:59 | -9.3 | NT | Down | 32.3 | 158.4 | Up | 03:59:59 - 04:29:59 | 7331 |
| Susanville | 04:14:57 | -10.1 | NT | Down | 33.1 | 159.0 | Up | 03:59:57 - 04:29:57 | 7292 |
| Greenville | 04:14:59 | -10.1 | NT | Down | 33.3 | 158.7 | Up | 03:59:59 - 04:29:59 | 7274 |
| Gimple | 04:14:59 | -10.1 | NT | Down | 33.3 | 158.8 | Up | 03:59:59 - 04:29:59 | 7274 |
| Quincy | 04:15:00 | -10.2 | NT | Down | 33.4 | 158.6 | Up | 04:00:00 - 04:30:00 | 7261 |
| Portola | 04:14:58 | -10.5 | NT | Down | 33.7 | 159.1 | Up | 03:59:58 - 04:29:58 | 7253 |
| Dunrhomin | 04:13:48 | -19.0 | Dark | Down | 35.7 | 176.7 | Up | 03:58:48 - 04:28:48 | 7246 |
| Reno | 04:14:55 | -11.1 | NT | Down | 34.1 | 159.8 | Up | 03:59:55 - 04:29:55 | 7236 |
| Carson City | 04:14:55 | -11.3 | NT | Down | 34.5 | 159.7 | Up | 03:59:55 - 04:29:55 | 7213 |
| Yerington | 04:14:53 | -11.8 | NT | Down | 34.8 | 160.4 | Up | 03:59:53 - 04:29:53 | 7200 |
| Gardnerville | 04:14:56 | -11.5 | NT | Down | 34.7 | 159.7 | Up | 03:59:56 - 04:29:56 | 7197 |
| Hawthorne | 04:14:51 | -12.4 | AT | Down | 35.4 | 160.9 | Up | 03:59:51 - 04:29:51 | 7169 |
| Tonopah | 04:14:46 | -13.6 | AT | Down | 36.2 | 162.4 | Up | 03:59:46 - 04:29:46 | 7137 |
| Lee Vining | 04:14:55 | -12.5 | AT | Down | 35.8 | 160.2 | Up | 03:59:55 - 04:29:55 | 7132 |
| Bishop | 04:14:51 | -13.3 | AT | Down | 36.5 | 160.9 | Up | 03:59:51 - 04:29:51 | 7090 |
| Beatty | 04:14:44 | -14.6 | AT | Down | 37.4 | 162.6 | Up | 03:59:44 - 04:29:44 | 7057 |
| Indian Springs | 04:14:40 | -15.4 | AT | Down | 37.9 | 163.8 | Up | 03:59:40 - 04:29:40 | 7033 |
| Henderson | 04:14:38 | -16.2 | AT | Down | 38.6 | 164.5 | Up | 03:59:38 - 04:29:38 | 6995 |
| Patrick | 04:14:33 | -17.3 | AT | Down | 39.4 | 165.7 | Up | 03:59:33 - 04:29:33 | 6948 |
| CPSLO | 04:15:04 | -13.0 | AT | Down | 37.8 | 157.7 | Up | 04:00:04 - 04:30:04 | 6946 |
| Kingman/Dolan Springs | 04:14:33 | -17.3 | AT | Down | 39.6 | 165.5 | Up | 03:59:33 - 04:29:33 | 6933 |
| Laughlin/Bullhead City | 04:14:37 | -17.0 | AT | Down | 39.5 | 164.8 | Up | 03:59:37 - 04:29:37 | 6932 |
| Mohave Valley | 04:14:37 | -17.2 | AT | Down | 39.8 | 164.8 | Up | 03:59:37 - 04:29:37 | 6912 |
| Lake Havasu City | 04:14:35 | -17.6 | AT | Down | 40.2 | 165.0 | Up | 03:59:35 - 04:29:35 | 6882 |
| Wildwood | 04:14:57 | -15.0 | AT | Down | 39.6 | 159.8 | Up | 03:59:57 - 04:29:57 | 6858 |
| Parker | 04:14:35 | -17.8 | AT | Down | 40.6 | 165.0 | Up | 03:59:35 - 04:29:35 | 6857 |
| Idyllwild | 04:14:48 | -16.5 | AT | Down | 40.4 | 161.9 | Up | 03:59:48 - 04:29:48 | 6832 |
| George/Scottsdale | 04:14:25 | -19.6 | Dark | Down | 41.5 | 167.9 | Up | 03:59:25 - 04:29:25 | 6820 |
| Blythe | 04:14:38 | -17.9 | AT | Down | 41.0 | 164.5 | Up | 03:59:38 - 04:29:38 | 6819 |
| Calipatria | 04:14:43 | -17.6 | AT | Down | 41.3 | 163.2 | Up | 03:59:43 - 04:29:43 | 6784 |
| Yuma | 04:14:39 | -18.5 | Dark | Down | 41.9 | 164.2 | Up | 03:59:39 - 04:29:39 | 6750 |
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 01KO77, (2021/07/31 04:14UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 24.63 144 35Eta Oph 17:10:22.7 -15:43:29 2.6 12.20 136 PPM 233766 17:56:19.0 -15:48:47 6.1 2.05 125 PPM 233881 18:00:20.5 -14:12:29 7.8 0.20 124 01KO77 18:00:21.4 -14:00:17 16.7 124 Positions are for J2000
Event circumstances last updated at 2021/05/17 01:05:45 UT
Marc W. Buie, Southwest Research Institute