Event between (491768) 12VV113 and star GA0920:00282759 with event index number of 2438265
Geocentric closest approach at 2021/12/01 02:09:03 UTC
J2000 position of star is 03:17:38.4 +02:47:54
Equinox of date position of star is 03:18:46.4 +02:52:37
Stellar brightness G=15.4,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 154 degrees from the moon.
Moon is 15% illuminated.
TNO apparent brightness V=23.5
[RECON map]
TNO is 40.8 AU from the Sun
and 39.9 AU from the Earth.
The TNO is moving 23.4
km/sec on the sky relative to the star, or,
2.9 arcsec/hr.
The 1-sigma error in the time of the event is 425 seconds.
The 1-sigma cross-track error in the shadow position is
4272 km.
The sky-plane scale is
28918.0 km/arcsec.
The TNO has an absolute magnitude Hv=7.4
Diameter=199.5 km assuming a 5% albedo -- 8.5 sec chord
Diameter=81.5 km assuming a 30% albedo -- 3.5 sec chord
Dynamical classification is SCATEXTD
Star training set for 491768, (2021/12/01 02:01UT) Object RA Dec mag sep mel Aldebaran 04:37:10.8 +16:33:06 0.8 23.63 134 Menkar 03:03:25.7 +04:10:28 2.5 4.04 158 97Kap2Cet 03:22:15.7 +03:45:11 6.2 1.23 153 PPM 146423 03:18:54.2 +03:45:36 8.3 0.88 154 PPM 146413 03:18:27.4 +03:13:04 9.2 0.35 154 PPM 146409 03:18:17.2 +02:41:42 10.5 0.22 154 491768 03:18:46.9 +02:52:39 15.4 154 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
2.1 sigma about the mid-time.
The median site spacing is 28.3 km
RECON observability=0.4 and success probability=3.4%
| 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 | 02:11:16 | -20.5 | Dark | Down | 17.5 | 107.3 | Really Low | 01:56:16 - 02:26:16 | 4807 |
| Kelowna | 02:11:18 | -20.4 | Dark | Down | 17.5 | 107.1 | Really Low | 01:56:18 - 02:26:18 | 4783 |
| Peachland | 02:11:18 | -20.2 | Dark | Down | 17.3 | 106.8 | Really Low | 01:56:18 - 02:26:18 | 4779 |
| Summerland | 02:11:19 | -20.2 | Dark | Down | 17.4 | 106.9 | Really Low | 01:56:19 - 02:26:19 | 4769 |
| Penticton | 02:11:19 | -20.3 | Dark | Down | 17.5 | 106.9 | Really Low | 01:56:19 - 02:26:19 | 4763 |
| Oliver | 02:11:20 | -20.2 | Dark | Down | 17.6 | 106.8 | Really Low | 01:56:20 - 02:26:20 | 4741 |
| Anarchist Mountain Observatory | 02:11:21 | -20.3 | Dark | Down | 17.8 | 106.9 | Really Low | 01:56:21 - 02:26:21 | 4729 |
| Victoria | 02:11:27 | -17.6 | AT | Down | 15.4 | 103.6 | Really Low | 01:56:27 - 02:26:27 | 4724 |
| Tonasket | 02:11:22 | -20.2 | Dark | Down | 17.8 | 106.8 | Really Low | 01:56:22 - 02:26:22 | 4709 |
| Okanogan | 02:11:23 | -20.0 | Dark | Down | 17.9 | 106.6 | Really Low | 01:56:23 - 02:26:23 | 4688 |
| Brewster | 02:11:25 | -19.9 | Dark | Down | 17.8 | 106.3 | Really Low | 01:56:25 - 02:26:25 | 4672 |
| Manson/Chelan | 02:11:26 | -19.6 | Dark | Down | 17.6 | 106.0 | Really Low | 01:56:26 - 02:26:26 | 4661 |
| Wenatchee | 02:11:27 | -19.4 | Dark | Down | 17.7 | 105.7 | Really Low | 01:56:27 - 02:26:27 | 4630 |
| Ellensburg | 02:11:29 | -19.1 | Dark | Down | 17.6 | 105.4 | Really Low | 01:56:29 - 02:26:29 | 4604 |
| Yakima | 02:11:31 | -19.1 | Dark | Down | 17.7 | 105.3 | Really Low | 01:56:31 - 02:26:31 | 4577 |
| Toppenish/White Swan | 02:11:32 | -19.1 | Dark | Down | 17.9 | 105.3 | Really Low | 01:56:32 - 02:26:32 | 4561 |
| Pasco | 02:11:30 | -20.0 | Dark | Down | 18.8 | 106.3 | Really Low | 01:56:30 - 02:26:30 | 4543 |
| Goldendale | 02:11:34 | -18.7 | Dark | Down | 17.8 | 104.8 | Really Low | 01:56:34 - 02:26:34 | 4526 |
| PNWRO | 02:11:31 | -20.1 | Dark | Down | 19.0 | 106.4 | Really Low | 01:56:31 - 02:26:31 | 4525 |
| The Dalles | 02:11:35 | -18.4 | Dark | Down | 17.6 | 104.5 | Really Low | 01:56:35 - 02:26:35 | 4513 |
| Maupin | 02:11:36 | -18.4 | Dark | Down | 17.8 | 104.4 | Really Low | 01:56:36 - 02:26:36 | 4483 |
| Sisters | 02:11:40 | -17.9 | AT | Down | 17.6 | 103.8 | Really Low | 01:56:40 - 02:26:40 | 4425 |
| Redmond | 02:11:40 | -18.2 | Dark | Down | 17.9 | 104.1 | Really Low | 01:56:40 - 02:26:40 | 4420 |
| Bend | 02:11:41 | -18.0 | Dark | Down | 17.9 | 103.9 | Really Low | 01:56:41 - 02:26:41 | 4406 |
| Oregon Observatory | 02:11:41 | -17.9 | AT | Down | 17.8 | 103.8 | Really Low | 01:56:41 - 02:26:41 | 4395 |
| La Pine/Gilchrist | 02:11:42 | -17.8 | AT | Down | 17.8 | 103.7 | Really Low | 01:56:42 - 02:26:42 | 4380 |
| North Lake | 02:11:43 | -18.1 | Dark | Down | 18.4 | 104.0 | Really Low | 01:56:43 - 02:26:43 | 4344 |
| Chiloquin | 02:11:46 | -17.3 | AT | Down | 17.9 | 103.1 | Really Low | 01:56:46 - 02:26:46 | 4302 |
| Paisley | 02:11:44 | -18.3 | Dark | Down | 18.8 | 104.1 | Really Low | 01:56:44 - 02:26:44 | 4301 |
| Klamath Falls | 02:11:47 | -17.3 | AT | Down | 18.0 | 103.0 | Really Low | 01:56:47 - 02:26:47 | 4276 |
| Lakeview | 02:11:46 | -18.3 | Dark | Down | 19.0 | 104.1 | Really Low | 01:56:46 - 02:26:46 | 4262 |
| Cedarville | 02:11:48 | -18.3 | Dark | Down | 19.3 | 104.0 | Really Low | 01:56:48 - 02:26:48 | 4212 |
| Fall River/Burney | 02:11:51 | -17.3 | AT | Down | 18.5 | 102.9 | Really Low | 01:56:51 - 02:26:51 | 4184 |
| Susanville | 02:11:52 | -17.7 | AT | Down | 19.2 | 103.3 | Really Low | 01:56:52 - 02:26:52 | 4130 |
| Greenville | 02:11:53 | -17.4 | AT | Down | 19.1 | 103.0 | Really Low | 01:56:53 - 02:26:53 | 4111 |
| Gimple | 02:11:53 | -17.4 | AT | Down | 19.2 | 103.0 | Really Low | 01:56:53 - 02:26:53 | 4111 |
| Quincy | 02:11:54 | -17.3 | AT | Down | 19.1 | 102.9 | Really Low | 01:56:54 - 02:26:54 | 4096 |
| Portola | 02:11:54 | -17.7 | AT | Down | 19.5 | 103.2 | Really Low | 01:56:54 - 02:26:54 | 4082 |
| Reno | 02:11:54 | -18.1 | Dark | Down | 20.1 | 103.6 | Low | 01:56:54 - 02:26:54 | 4056 |
| Carson City | 02:11:55 | -18.0 | Dark | Down | 20.2 | 103.4 | Low | 01:56:55 - 02:26:55 | 4028 |
| Gardnerville | 02:11:55 | -18.0 | Dark | Down | 20.3 | 103.4 | Low | 01:56:55 - 02:26:55 | 4008 |
| Yerington | 02:11:54 | -18.5 | Dark | Down | 20.7 | 103.8 | Low | 01:56:54 - 02:26:54 | 4007 |
| Dunrhomin | 02:11:25 | -29.2 | Dark | Down | 30.4 | 115.0 | Up | 01:56:25 - 02:26:25 | 3979 |
| Hawthorne | 02:11:55 | -18.8 | Dark | Down | 21.2 | 104.0 | Low | 01:56:55 - 02:26:55 | 3966 |
| Lee Vining | 02:11:58 | -18.3 | Dark | Down | 21.0 | 103.5 | Low | 01:56:58 - 02:26:58 | 3925 |
| Tonopah | 02:11:54 | -19.7 | Dark | Down | 22.4 | 104.8 | Low | 01:56:54 - 02:26:54 | 3916 |
| Bishop | 02:11:58 | -18.7 | Dark | Down | 21.7 | 103.7 | Low | 01:56:58 - 02:26:58 | 3870 |
| Beatty | 02:11:57 | -19.8 | Dark | Down | 23.1 | 104.7 | Low | 01:56:57 - 02:26:57 | 3818 |
| Indian Springs | 02:11:56 | -20.6 | Dark | Down | 24.0 | 105.3 | Low | 01:56:56 - 02:26:56 | 3781 |
| Henderson | 02:11:57 | -21.0 | Dark | Down | 24.7 | 105.5 | Low | 01:56:57 - 02:26:57 | 3730 |
| CPSLO | 02:12:08 | -16.4 | AT | Down | 20.4 | 101.5 | Low | 01:57:08 - 02:27:08 | 3719 |
| Patrick | 02:11:56 | -21.8 | Dark | Down | 25.7 | 106.0 | Low | 01:56:56 - 02:26:56 | 3667 |
| Laughlin/Bullhead City | 02:11:58 | -21.2 | Dark | Down | 25.2 | 105.4 | Low | 01:56:58 - 02:26:58 | 3653 |
| Kingman/Dolan Springs | 02:11:57 | -21.6 | Dark | Down | 25.6 | 105.8 | Low | 01:56:57 - 02:26:57 | 3650 |
| Mohave Valley | 02:11:59 | -21.1 | Dark | Down | 25.3 | 105.3 | Low | 01:56:59 - 02:26:59 | 3630 |
| Wildwood | 02:12:08 | -17.7 | AT | Down | 22.3 | 102.3 | Low | 01:57:08 - 02:27:08 | 3599 |
| Lake Havasu City | 02:11:59 | -21.2 | Dark | Down | 25.6 | 105.3 | Low | 01:56:59 - 02:26:59 | 3593 |
| Parker | 02:12:01 | -21.2 | Dark | Down | 25.7 | 105.1 | Low | 01:57:01 - 02:27:01 | 3563 |
| Idyllwild | 02:12:06 | -19.2 | Dark | Down | 23.9 | 103.4 | Low | 01:57:06 - 02:27:06 | 3552 |
| Blythe | 02:12:02 | -20.8 | Dark | Down | 25.6 | 104.7 | Low | 01:57:02 - 02:27:02 | 3520 |
| George/Scottsdale | 02:11:57 | -23.1 | Dark | Down | 27.8 | 106.6 | Low | 01:56:57 - 02:26:57 | 3503 |
| Calipatria | 02:12:06 | -20.0 | Dark | Down | 25.0 | 103.9 | Low | 01:57:06 - 02:27:06 | 3487 |
| Yuma | 02:12:05 | -20.6 | Dark | Down | 25.8 | 104.3 | Low | 01:57:05 - 02:27:05 | 3440 |
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 491768, (2021/12/01 02:01UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:29 0.8 23.63 134 Menkar 03:02:16.8 +04:05:21 2.5 4.04 158 97Kap2Cet 03:21:06.9 +03:40:32 6.2 1.23 153 PPM 146423 03:17:45.4 +03:40:51 8.3 0.88 154 PPM 146413 03:17:18.8 +03:08:19 9.2 0.35 154 PPM 146409 03:17:08.7 +02:36:57 10.5 0.22 154 491768 03:17:38.4 +02:47:54 15.4 154 Positions are for J2000
Event circumstances last updated at 2021/10/11 01:43:23 UT
Marc W. Buie, Southwest Research Institute