Event between 20YR3 and star GA1220:01993727 with event index number of 2179104
Geocentric closest approach at 2021/12/28 13:15:15 UTC
J2000 position of star is 05:39:12.9 +32:19:42
Equinox of date position of star is 05:40:38.8 +32:20:20
Stellar brightness G=16.5,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 119 degrees from the moon.
Moon is 34% illuminated.
TNO apparent brightness V=21.7
[RECON map]
TNO is 17.4 AU from the Sun
and 16.5 AU from the Earth.
The TNO is moving 39.4
km/sec on the sky relative to the star, or,
11.9 arcsec/hr.
The 1-sigma error in the time of the event is 33 seconds.
The 1-sigma cross-track error in the shadow position is
684 km.
The sky-plane scale is
11953.3 km/arcsec.
The TNO has an absolute magnitude Hv=9.3
Diameter=83.9 km assuming a 5% albedo -- 2.1 sec chord
Diameter=34.3 km assuming a 30% albedo -- 0.9 sec chord
Dynamical classification is CENTAURR
Star training set for 20YR3, (2021/12/28 13:15UT) Object RA Dec mag sep mel Aldebaran 04:37:11.1 +16:33:06 0.8 21.34 136 Alnath 05:27:41.0 +28:37:26 1.6 4.65 122 PPM 070700 05:42:01.3 +31:22:05 5.9 1.01 119 PPM 070659 05:40:08.0 +32:29:09 8.5 0.18 119 20YR3 05:40:39.1 +32:20:20 16.5 118 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 20.4 km
RECON observability=0.6 and success probability=0.1%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Sleaford | 13:13:28 | -16.9 | AT | Up | 16.8 | 301.5 | Really Low | 13:10:13 - 13:16:42 | 4576 |
| Kamloops | 13:13:23 | -25.5 | Dark | Up | 24.2 | 292.1 | Low | 13:10:09 - 13:16:38 | 3949 |
| Kelowna | 13:13:21 | -24.8 | Dark | Up | 23.4 | 293.0 | Low | 13:10:07 - 13:16:36 | 3929 |
| Peachland | 13:13:21 | -25.0 | Dark | Up | 23.5 | 292.9 | Low | 13:10:07 - 13:16:36 | 3910 |
| Summerland | 13:13:21 | -24.9 | Dark | Up | 23.4 | 293.0 | Low | 13:10:06 - 13:16:35 | 3903 |
| Penticton | 13:13:21 | -24.9 | Dark | Up | 23.3 | 293.1 | Low | 13:10:06 - 13:16:35 | 3903 |
| Dunrhomin | 13:13:06 | -12.8 | AT | Up | 9.9 | 304.3 | Really Low | 13:09:52 - 13:16:21 | 3889 |
| Oliver | 13:13:20 | -24.8 | Dark | Up | 23.1 | 293.2 | Low | 13:10:05 - 13:16:34 | 3879 |
| Anarchist Mountain Observatory | 13:13:19 | -24.7 | Dark | Up | 23.0 | 293.4 | Low | 13:10:05 - 13:16:34 | 3875 |
| Tonasket | 13:13:19 | -24.7 | Dark | Up | 22.9 | 293.5 | Low | 13:10:05 - 13:16:34 | 3851 |
| Okanogan | 13:13:18 | -24.7 | Dark | Up | 22.8 | 293.5 | Low | 13:10:04 - 13:16:33 | 3822 |
| Brewster | 13:13:18 | -24.8 | Dark | Up | 22.9 | 293.5 | Low | 13:10:03 - 13:16:32 | 3795 |
| Manson/Chelan | 13:13:18 | -25.1 | Dark | Up | 23.0 | 293.4 | Low | 13:10:03 - 13:16:32 | 3766 |
| Wenatchee | 13:13:17 | -25.1 | Dark | Up | 22.9 | 293.4 | Low | 13:10:02 - 13:16:31 | 3726 |
| Pasco | 13:13:14 | -24.1 | Dark | Up | 21.7 | 294.6 | Low | 13:10:00 - 13:16:29 | 3693 |
| Ellensburg | 13:13:16 | -25.2 | Dark | Up | 22.9 | 293.5 | Low | 13:10:01 - 13:16:30 | 3688 |
| PNWRO | 13:13:14 | -23.9 | Dark | Up | 21.5 | 294.8 | Low | 13:09:59 - 13:16:28 | 3685 |
| Victoria | 13:13:19 | -27.3 | Dark | Up | 25.3 | 291.0 | Low | 13:10:05 - 13:16:34 | 3682 |
| Yakima | 13:13:15 | -25.2 | Dark | Up | 22.7 | 293.6 | Low | 13:10:01 - 13:16:30 | 3658 |
| Toppenish/White Swan | 13:13:15 | -25.0 | Dark | Up | 22.6 | 293.8 | Low | 13:10:00 - 13:16:29 | 3649 |
| Goldendale | 13:13:14 | -25.2 | Dark | Up | 22.6 | 293.7 | Low | 13:09:59 - 13:16:28 | 3592 |
| The Dalles | 13:13:13 | -25.5 | Dark | Up | 22.8 | 293.6 | Low | 13:09:59 - 13:16:28 | 3560 |
| Maupin | 13:13:13 | -25.3 | Dark | Up | 22.5 | 293.8 | Low | 13:09:58 - 13:16:27 | 3534 |
| Redmond | 13:13:11 | -25.3 | Dark | Up | 22.2 | 294.1 | Low | 13:09:56 - 13:16:25 | 3463 |
| Sisters | 13:13:11 | -25.5 | Dark | Up | 22.5 | 293.9 | Low | 13:09:56 - 13:16:25 | 3448 |
| Bend | 13:13:11 | -25.3 | Dark | Up | 22.2 | 294.1 | Low | 13:09:56 - 13:16:25 | 3441 |
| Oregon Observatory | 13:13:10 | -25.4 | Dark | Up | 22.2 | 294.1 | Low | 13:09:56 - 13:16:25 | 3423 |
| La Pine/Gilchrist | 13:13:10 | -25.4 | Dark | Up | 22.2 | 294.1 | Low | 13:09:55 - 13:16:24 | 3405 |
| North Lake | 13:13:09 | -24.9 | Dark | Up | 21.6 | 294.6 | Low | 13:09:55 - 13:16:24 | 3398 |
| Paisley | 13:13:08 | -24.6 | Dark | Up | 21.1 | 295.0 | Low | 13:09:53 - 13:16:22 | 3372 |
| Lakeview | 13:13:07 | -24.3 | Dark | Up | 20.8 | 295.3 | Low | 13:09:53 - 13:16:22 | 3342 |
| Chiloquin | 13:13:08 | -25.5 | Dark | Up | 22.0 | 294.3 | Low | 13:09:53 - 13:16:22 | 3305 |
| Cedarville | 13:13:06 | -24.1 | Dark | Up | 20.4 | 295.6 | Low | 13:09:51 - 13:16:20 | 3300 |
| Klamath Falls | 13:13:07 | -25.4 | Dark | Up | 21.8 | 294.5 | Low | 13:09:53 - 13:16:22 | 3282 |
| Fall River/Burney | 13:13:05 | -24.9 | Dark | Up | 21.0 | 295.1 | Low | 13:09:51 - 13:16:20 | 3208 |
| Susanville | 13:13:04 | -24.3 | Dark | Up | 20.3 | 295.7 | Low | 13:09:50 - 13:16:19 | 3192 |
| Tonopah | 13:13:00 | -21.2 | Dark | Up | 16.8 | 298.2 | Really Low | 13:09:46 - 13:16:15 | 3168 |
| Reno | 13:13:02 | -23.5 | Dark | Up | 19.3 | 296.5 | Really Low | 13:09:48 - 13:16:17 | 3162 |
| Gimple | 13:13:04 | -24.4 | Dark | Up | 20.3 | 295.7 | Low | 13:09:49 - 13:16:18 | 3161 |
| Greenville | 13:13:04 | -24.4 | Dark | Up | 20.3 | 295.7 | Low | 13:09:49 - 13:16:18 | 3157 |
| Portola | 13:13:03 | -24.0 | Dark | Up | 19.9 | 296.0 | Really Low | 13:09:48 - 13:16:17 | 3153 |
| Yerington | 13:13:02 | -22.9 | Dark | Up | 18.6 | 297.0 | Really Low | 13:09:47 - 13:16:16 | 3149 |
| Quincy | 13:13:04 | -24.4 | Dark | Up | 20.3 | 295.8 | Low | 13:09:49 - 13:16:18 | 3141 |
| Hawthorne | 13:13:01 | -22.4 | Dark | Up | 18.0 | 297.4 | Really Low | 13:09:46 - 13:16:15 | 3138 |
| Carson City | 13:13:02 | -23.4 | Dark | Up | 19.1 | 296.6 | Really Low | 13:09:47 - 13:16:16 | 3135 |
| Indian Springs | 13:12:58 | -19.6 | Dark | Up | 15.0 | 299.3 | Really Low | 13:09:43 - 13:16:12 | 3125 |
| Patrick | 13:12:56 | -17.9 | AT | Up | 13.2 | 300.5 | Really Low | 13:09:42 - 13:16:11 | 3122 |
| Gardnerville | 13:13:01 | -23.3 | Dark | Up | 19.0 | 296.7 | Really Low | 13:09:47 - 13:16:16 | 3118 |
| Henderson | 13:12:57 | -18.9 | Dark | Up | 14.3 | 299.8 | Really Low | 13:09:43 - 13:16:12 | 3117 |
| Beatty | 13:12:58 | -20.5 | Dark | Up | 16.0 | 298.7 | Really Low | 13:09:44 - 13:16:13 | 3099 |
| Kingman/Dolan Springs | 13:12:56 | -18.0 | AT | Up | 13.2 | 300.4 | Really Low | 13:09:41 - 13:16:10 | 3096 |
| George/Scottsdale | 13:12:54 | -15.8 | AT | Up | 10.9 | 301.7 | Really Low | 13:09:40 - 13:16:09 | 3089 |
| Lee Vining | 13:13:00 | -22.6 | Dark | Up | 18.1 | 297.3 | Really Low | 13:09:45 - 13:16:14 | 3071 |
| Laughlin/Bullhead City | 13:12:56 | -18.4 | Dark | Up | 13.6 | 300.2 | Really Low | 13:09:41 - 13:16:10 | 3068 |
| Bishop | 13:12:59 | -21.9 | Dark | Up | 17.3 | 297.8 | Really Low | 13:09:45 - 13:16:14 | 3057 |
| Mohave Valley | 13:12:56 | -18.3 | Dark | Up | 13.4 | 300.2 | Really Low | 13:09:41 - 13:16:10 | 3047 |
| Lake Havasu City | 13:12:55 | -18.0 | Dark | Up | 13.1 | 300.4 | Really Low | 13:09:41 - 13:16:10 | 3028 |
| Parker | 13:12:55 | -17.9 | AT | Up | 12.9 | 300.5 | Really Low | 13:09:40 - 13:16:09 | 3001 |
| Blythe | 13:12:54 | -18.0 | AT | Up | 12.8 | 300.5 | Really Low | 13:09:39 - 13:16:08 | 2944 |
| Yuma | 13:12:52 | -17.8 | AT | Up | 12.4 | 300.6 | Really Low | 13:09:38 - 13:16:07 | 2868 |
| Calipatria | 13:12:53 | -18.6 | Dark | Up | 13.2 | 300.2 | Really Low | 13:09:38 - 13:16:07 | 2858 |
| Idyllwild | 13:12:54 | -19.7 | Dark | Up | 14.4 | 299.5 | Really Low | 13:09:39 - 13:16:08 | 2848 |
| Wildwood | 13:12:54 | -21.3 | Dark | Up | 15.9 | 298.6 | Really Low | 13:09:40 - 13:16:09 | 2783 |
| CPSLO | 13:12:56 | -23.2 | Dark | Up | 18.0 | 297.3 | Really Low | 13:09:42 - 13:16:11 | 2782 |
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 20YR3, (2021/12/28 13:15UT) Object RA Dec mag sep mel Aldebaran 04:35:55.3 +16:30:29 0.8 21.34 136 Alnath 05:26:17.6 +28:36:23 1.6 4.65 122 PPM 070700 05:40:35.9 +31:21:29 5.9 1.01 119 PPM 070659 05:38:41.7 +32:28:29 8.5 0.18 119 20YR3 05:39:12.9 +32:19:42 16.5 119 Positions are for J2000
Event circumstances last updated at 2021/12/05 02:00:43 UT
Marc W. Buie, Southwest Research Institute