Event between (307261) 02MS4 and star GA0820:14379891 with event index number of 2183791
Geocentric closest approach at 2021/10/14 03:27:00 UTC
J2000 position of star is 18:50:30.8 -06:24:13
Equinox of date position of star is 18:51:40.9 -06:22:37
Stellar brightness G=16.3,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 29 degrees from the moon.
Moon is 61% illuminated.
TNO apparent brightness V=20.6
[RECON map]
TNO is 46.4 AU from the Sun
and 46.5 AU from the Earth.
The TNO is moving 11.6
km/sec on the sky relative to the star, or,
1.2 arcsec/hr.
The 1-sigma error in the time of the event is 412 seconds.
The 1-sigma cross-track error in the shadow position is
2231 km.
The sky-plane scale is
33743.1 km/arcsec.
The TNO has an absolute magnitude Hv=3.8
Diameter=1066.6 km assuming a 5% albedo -- 91.8 sec chord
Diameter=435.5 km assuming a 30% albedo -- 37.5 sec chord
Dynamical classification is SCATEXTD
Star training set for 307261, (2021/10/14 03:27UT) Object RA Dec mag sep mel Antares 16:30:44.8 -26:28:43 0.9 39.09 54 Nunki 18:56:36.9 -26:16:04 2.0 19.93 21 PPM 202138 18:48:38.7 -05:40:48 4.6 1.03 30 PPM 202252 18:53:55.5 -05:49:16 8.1 0.79 29 PPM 202173 18:50:35.9 -06:08:08 9.5 0.36 30 307261 18:51:40.9 -06:22:37 16.3 29 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
2.2 sigma about the mid-time.
The median site spacing is 4.3 km
RECON observability=1.0 and success probability=4.7%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Dunrhomin | 03:27:08 | -35.4 | Dark | Up | 26.5 | 234.2 | Low | 03:12:08 - 03:42:08 | -3451 |
| Clarence Fulton | 03:24:50 | -22.4 | Dark | Up | 26.9 | 216.4 | Low | 03:09:50 - 03:39:50 | -3664 |
| Kelowna | 03:24:53 | -22.4 | Dark | Up | 27.2 | 216.4 | Low | 03:09:53 - 03:39:53 | -3678 |
| Penticton | 03:24:55 | -22.4 | Dark | Up | 27.5 | 216.4 | Low | 03:09:55 - 03:39:55 | -3689 |
| Summerland | 03:24:57 | -22.4 | Dark | Up | 27.5 | 216.2 | Low | 03:09:57 - 03:39:57 | -3691 |
| Peachland | 03:24:55 | -22.3 | Dark | Up | 27.4 | 216.1 | Low | 03:09:55 - 03:39:55 | -3691 |
| Anarchist Mountain Observatory | 03:25:00 | -22.7 | Dark | Up | 27.9 | 216.8 | Low | 03:10:00 - 03:40:00 | -3693 |
| Oliver | 03:25:00 | -22.5 | Dark | Up | 27.8 | 216.5 | Low | 03:10:00 - 03:40:00 | -3697 |
| Tonasket | 03:25:02 | -22.7 | Dark | Up | 28.2 | 216.8 | Low | 03:10:02 - 03:40:02 | -3704 |
| Okanogan | 03:25:01 | -22.7 | Dark | Up | 28.5 | 216.7 | Low | 03:10:01 - 03:40:01 | -3718 |
| Brewster | 03:25:04 | -22.7 | Dark | Up | 28.8 | 216.6 | Low | 03:10:04 - 03:40:04 | -3731 |
| Manson/Chelan | 03:25:02 | -22.5 | Dark | Up | 29.1 | 216.3 | Low | 03:10:02 - 03:40:02 | -3750 |
| PNWRO | 03:25:21 | -23.8 | Dark | Up | 30.0 | 218.4 | Up | 03:10:21 - 03:40:21 | -3754 |
| Pasco | 03:25:21 | -23.6 | Dark | Up | 29.9 | 218.0 | Low | 03:10:21 - 03:40:21 | -3756 |
| Wenatchee | 03:25:04 | -22.5 | Dark | Up | 29.5 | 216.3 | Low | 03:10:04 - 03:40:04 | -3769 |
| Ellensburg | 03:25:07 | -22.4 | Dark | Up | 30.0 | 216.2 | Low | 03:10:07 - 03:40:07 | -3788 |
| Toppenish/White Swan | 03:25:11 | -22.7 | Dark | Up | 30.4 | 216.6 | Up | 03:10:11 - 03:40:11 | -3800 |
| Yakima | 03:25:09 | -22.5 | Dark | Up | 30.3 | 216.4 | Up | 03:10:09 - 03:40:09 | -3800 |
| Goldendale | 03:25:13 | -22.5 | Dark | Up | 31.0 | 216.4 | Up | 03:10:13 - 03:40:13 | -3832 |
| The Dalles | 03:25:12 | -22.3 | Dark | Up | 31.3 | 216.1 | Up | 03:10:12 - 03:40:12 | -3853 |
| Victoria | 03:24:46 | -20.2 | Dark | Up | 29.8 | 212.6 | Low | 03:09:46 - 03:39:46 | -3853 |
| Maupin | 03:25:14 | -22.4 | Dark | Up | 31.6 | 216.3 | Up | 03:10:14 - 03:40:14 | -3861 |
| Redmond | 03:25:23 | -22.6 | Dark | Up | 32.4 | 216.6 | Up | 03:10:23 - 03:40:23 | -3893 |
| Bend | 03:25:26 | -22.5 | Dark | Up | 32.6 | 216.6 | Up | 03:10:26 - 03:40:26 | -3905 |
| Sisters | 03:25:20 | -22.3 | Dark | Up | 32.5 | 216.2 | Up | 03:10:20 - 03:40:20 | -3908 |
| North Lake | 03:25:33 | -23.0 | Dark | Up | 33.1 | 217.3 | Up | 03:10:33 - 03:40:33 | -3915 |
| Oregon Observatory | 03:25:21 | -22.5 | Dark | Up | 32.8 | 216.5 | Up | 03:10:21 - 03:40:21 | -3916 |
| Paisley | 03:25:39 | -23.4 | Dark | Up | 33.3 | 218.0 | Up | 03:10:39 - 03:40:39 | -3920 |
| George/Scottsdale | 03:27:26 | -32.3 | Dark | Up | 34.7 | 231.4 | Up | 03:12:26 - 03:42:26 | -3924 |
| La Pine/Gilchrist | 03:25:25 | -22.5 | Dark | Up | 33.0 | 216.5 | Up | 03:10:25 - 03:40:25 | -3925 |
| Lakeview | 03:25:39 | -23.6 | Dark | Up | 33.6 | 218.4 | Up | 03:10:39 - 03:40:39 | -3930 |
| Patrick | 03:27:04 | -30.2 | Dark | Up | 34.9 | 228.5 | Up | 03:12:04 - 03:42:04 | -3930 |
| Cedarville | 03:25:44 | -23.9 | Dark | Up | 34.1 | 218.9 | Up | 03:10:44 - 03:40:44 | -3946 |
| Kingman/Dolan Springs | 03:27:03 | -30.1 | Dark | Up | 35.2 | 228.4 | Up | 03:12:03 - 03:42:03 | -3947 |
| Henderson | 03:26:53 | -29.1 | Dark | Up | 35.2 | 227.0 | Up | 03:11:53 - 03:41:53 | -3949 |
| Indian Springs | 03:26:44 | -28.5 | Dark | Up | 35.2 | 226.1 | Up | 03:11:44 - 03:41:44 | -3955 |
| Tonopah | 03:26:26 | -26.9 | Dark | Up | 35.1 | 223.7 | Up | 03:11:26 - 03:41:26 | -3956 |
| Laughlin/Bullhead City | 03:27:02 | -29.7 | Dark | Up | 35.5 | 227.9 | Up | 03:12:02 - 03:42:02 | -3969 |
| Chiloquin | 03:25:32 | -22.4 | Dark | Up | 34.0 | 216.6 | Up | 03:10:32 - 03:40:32 | -3978 |
| Mohave Valley | 03:27:03 | -29.7 | Dark | Up | 35.7 | 228.1 | Up | 03:12:03 - 03:42:03 | -3981 |
| Beatty | 03:26:39 | -27.5 | Dark | Up | 35.6 | 224.8 | Up | 03:11:39 - 03:41:39 | -3985 |
| Klamath Falls | 03:25:34 | -22.5 | Dark | Up | 34.3 | 216.8 | Up | 03:10:34 - 03:40:34 | -3986 |
| Lake Havasu City | 03:27:08 | -30.0 | Dark | Up | 35.8 | 228.6 | Up | 03:12:08 - 03:42:08 | -3988 |
| Hawthorne | 03:26:16 | -25.7 | Dark | Up | 35.5 | 222.0 | Up | 03:11:16 - 03:41:16 | -3996 |
| Yerington | 03:26:10 | -25.2 | Dark | Up | 35.5 | 221.2 | Up | 03:11:10 - 03:41:10 | -3999 |
| Parker | 03:27:11 | -30.1 | Dark | Up | 36.0 | 228.8 | Up | 03:12:11 - 03:42:11 | -4002 |
| Reno | 03:26:04 | -24.6 | Dark | Up | 35.4 | 220.2 | Up | 03:11:04 - 03:41:04 | -4005 |
| Susanville | 03:25:53 | -23.7 | Dark | Up | 35.1 | 218.9 | Up | 03:10:53 - 03:40:53 | -4006 |
| Fall River/Burney | 03:25:42 | -23.1 | Dark | Up | 35.0 | 217.8 | Up | 03:10:42 - 03:40:42 | -4014 |
| Carson City | 03:26:07 | -24.7 | Dark | Up | 35.6 | 220.4 | Up | 03:11:07 - 03:41:07 | -4018 |
| Portola | 03:25:57 | -24.0 | Dark | Up | 35.5 | 219.4 | Up | 03:10:57 - 03:40:57 | -4022 |
| Gimple | 03:25:53 | -23.6 | Dark | Up | 35.5 | 218.8 | Up | 03:10:53 - 03:40:53 | -4026 |
| Gardnerville | 03:26:07 | -24.7 | Dark | Up | 35.8 | 220.6 | Up | 03:11:07 - 03:41:07 | -4026 |
| Greenville | 03:25:53 | -23.6 | Dark | Up | 35.5 | 218.7 | Up | 03:10:53 - 03:40:53 | -4030 |
| Bishop | 03:26:25 | -26.1 | Dark | Up | 36.2 | 222.8 | Up | 03:11:25 - 03:41:25 | -4033 |
| Quincy | 03:25:53 | -23.6 | Dark | Up | 35.7 | 218.8 | Up | 03:10:53 - 03:40:53 | -4037 |
| Blythe | 03:27:12 | -30.0 | Dark | Up | 36.5 | 228.8 | Up | 03:12:12 - 03:42:12 | -4038 |
| Lee Vining | 03:26:17 | -25.4 | Dark | Up | 36.2 | 221.7 | Up | 03:11:17 - 03:41:17 | -4038 |
| Yuma | 03:27:19 | -30.2 | Dark | Up | 37.1 | 229.3 | Up | 03:12:19 - 03:42:19 | -4081 |
| Calipatria | 03:27:11 | -29.3 | Dark | Up | 37.4 | 228.2 | Up | 03:12:11 - 03:42:11 | -4099 |
| Idyllwild | 03:27:00 | -28.2 | Dark | Up | 37.8 | 226.6 | Up | 03:12:00 - 03:42:00 | -4120 |
| Wildwood | 03:26:49 | -26.5 | Dark | Up | 38.7 | 224.4 | Up | 03:11:49 - 03:41:49 | -4185 |
| CPSLO | 03:26:28 | -24.6 | Dark | Up | 39.0 | 221.5 | Up | 03:11:28 - 03:41:28 | -4221 |
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 307261, (2021/10/14 03:27UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 39.09 54 Nunki 18:55:15.9 -26:17:49 2.0 19.93 21 PPM 202138 18:47:28.9 -05:42:19 4.6 1.03 30 PPM 202252 18:52:45.7 -05:50:56 8.1 0.79 29 PPM 202173 18:49:25.8 -06:09:43 9.5 0.36 30 307261 18:50:30.8 -06:24:13 16.3 29 Positions are for J2000
Event circumstances last updated at 2021/10/10 00:59:12 UT
Marc W. Buie, Southwest Research Institute