Event between (503858) 98HQ151 and star GA0760:19506228 with event index number of 1137126
Geocentric closest approach at 2021/08/02 07:27:30 UTC
J2000 position of star is 18:54:56.1 -12:37:33
Equinox of date position of star is 18:56:07.0 -12:35:51
Stellar brightness G=16.7,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 135 degrees from the moon.
Moon is 34% illuminated.
TNO apparent brightness V=24.0
[RECON map]
TNO is 33.0 AU from the Sun
and 32.1 AU from the Earth.
The TNO is moving 20.9
km/sec on the sky relative to the star, or,
3.2 arcsec/hr.
The 1-sigma error in the time of the event is 498 seconds.
The 1-sigma cross-track error in the shadow position is
3892 km.
The sky-plane scale is
23296.7 km/arcsec.
The TNO has an absolute magnitude Hv=8.8
Diameter=104.7 km assuming a 5% albedo -- 5.0 sec chord
Diameter=42.8 km assuming a 30% albedo -- 2.0 sec chord
Dynamical classification is 3:2E
Star training set for 503858, (2021/08/02 07:27UT) Object RA Dec mag sep mel Antares 16:30:44.1 -26:28:41 0.9 36.79 168 Nunki 18:56:36.1 -26:16:05 2.0 13.67 137 PPM 235105 18:51:44.3 -13:32:44 6.5 1.43 136 PPM 235280 18:58:38.5 -13:04:17 8.5 0.77 135 PPM 235203 18:55:39.8 -12:34:53 9.7 0.12 135 503858 18:56:08.7 -12:35:49 16.7 135 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
1.8 sigma about the mid-time.
The median site spacing is 17.2 km
RECON observability=1.0 and success probability=2.9%
| 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 | 07:25:40 | -21.6 | Dark | Up | 24.8 | 201.0 | Low | 07:10:40 - 07:40:40 | 9217 |
| Kelowna | 07:25:41 | -21.9 | Dark | Up | 25.2 | 200.9 | Low | 07:10:41 - 07:40:41 | 9198 |
| Peachland | 07:25:41 | -22.0 | Dark | Down | 25.4 | 200.6 | Low | 07:10:41 - 07:40:41 | 9196 |
| Victoria | 07:25:52 | -22.7 | Dark | Down | 27.3 | 197.0 | Low | 07:10:52 - 07:40:52 | 9187 |
| Summerland | 07:25:41 | -22.2 | Dark | Down | 25.5 | 200.8 | Low | 07:10:41 - 07:40:41 | 9186 |
| Penticton | 07:25:41 | -22.2 | Dark | Down | 25.6 | 200.9 | Low | 07:10:41 - 07:40:41 | 9181 |
| Oliver | 07:25:40 | -22.6 | Dark | Down | 25.9 | 200.9 | Low | 07:10:40 - 07:40:40 | 9160 |
| Anarchist Mountain Observatory | 07:25:39 | -22.8 | Dark | Down | 26.0 | 201.2 | Low | 07:10:39 - 07:40:39 | 9148 |
| Tonasket | 07:25:39 | -23.1 | Dark | Down | 26.3 | 201.2 | Low | 07:10:39 - 07:40:39 | 9130 |
| Okanogan | 07:25:39 | -23.4 | Dark | Down | 26.7 | 201.1 | Low | 07:10:39 - 07:40:39 | 9113 |
| Brewster | 07:25:40 | -23.6 | Dark | Down | 27.0 | 200.9 | Low | 07:10:40 - 07:40:40 | 9101 |
| Manson/Chelan | 07:25:40 | -23.8 | Dark | Down | 27.3 | 200.5 | Low | 07:10:40 - 07:40:40 | 9095 |
| Wenatchee | 07:25:41 | -24.2 | Dark | Down | 27.7 | 200.4 | Low | 07:10:41 - 07:40:41 | 9070 |
| Ellensburg | 07:25:42 | -24.6 | Dark | Down | 28.2 | 200.3 | Low | 07:10:42 - 07:40:42 | 9049 |
| Yakima | 07:25:42 | -25.0 | Dark | Down | 28.6 | 200.4 | Low | 07:10:42 - 07:40:42 | 9024 |
| Toppenish/White Swan | 07:25:41 | -25.2 | Dark | Down | 28.7 | 200.6 | Low | 07:10:41 - 07:40:41 | 9008 |
| Goldendale | 07:25:42 | -25.7 | Dark | Down | 29.3 | 200.2 | Low | 07:10:42 - 07:40:42 | 8981 |
| Pasco | 07:25:36 | -25.5 | Dark | Down | 28.5 | 201.9 | Low | 07:10:36 - 07:40:36 | 8977 |
| The Dalles | 07:25:43 | -25.9 | Dark | Down | 29.6 | 199.9 | Low | 07:10:43 - 07:40:43 | 8973 |
| PNWRO | 07:25:35 | -25.8 | Dark | Down | 28.7 | 202.2 | Low | 07:10:35 - 07:40:35 | 8958 |
| Maupin | 07:25:43 | -26.3 | Dark | Down | 30.0 | 200.1 | Up | 07:10:43 - 07:40:43 | 8945 |
| Sisters | 07:25:43 | -27.1 | Dark | Down | 31.0 | 199.7 | Up | 07:10:43 - 07:40:43 | 8899 |
| Redmond | 07:25:43 | -27.2 | Dark | Down | 30.9 | 200.2 | Up | 07:10:43 - 07:40:43 | 8890 |
| Bend | 07:25:42 | -27.4 | Dark | Down | 31.1 | 200.0 | Up | 07:10:42 - 07:40:42 | 8879 |
| Oregon Observatory | 07:25:43 | -27.5 | Dark | Down | 31.3 | 199.9 | Up | 07:10:43 - 07:40:43 | 8870 |
| La Pine/Gilchrist | 07:25:42 | -27.7 | Dark | Down | 31.5 | 199.9 | Up | 07:10:42 - 07:40:42 | 8858 |
| North Lake | 07:25:41 | -28.2 | Dark | Down | 31.8 | 200.7 | Up | 07:10:41 - 07:40:41 | 8818 |
| Paisley | 07:25:39 | -28.8 | Dark | Down | 32.2 | 201.2 | Up | 07:10:39 - 07:40:39 | 8774 |
| Klamath Falls | 07:25:43 | -29.1 | Dark | Down | 33.0 | 199.9 | Up | 07:10:43 - 07:40:43 | 8766 |
| Lakeview | 07:25:38 | -29.4 | Dark | Down | 32.6 | 201.5 | Up | 07:10:38 - 07:40:38 | 8736 |
| Cedarville | 07:25:37 | -30.0 | Dark | Down | 33.2 | 201.8 | Up | 07:10:37 - 07:40:37 | 8688 |
| Fall River/Burney | 07:25:41 | -30.3 | Dark | Down | 34.0 | 200.6 | Up | 07:10:41 - 07:40:41 | 8678 |
| Susanville | 07:25:38 | -31.0 | Dark | Down | 34.4 | 201.6 | Up | 07:10:38 - 07:40:38 | 8620 |
| Greenville | 07:25:39 | -31.3 | Dark | Down | 34.7 | 201.3 | Up | 07:10:39 - 07:40:39 | 8606 |
| Gimple | 07:25:38 | -31.3 | Dark | Down | 34.7 | 201.4 | Up | 07:10:38 - 07:40:38 | 8604 |
| Quincy | 07:25:39 | -31.5 | Dark | Down | 34.9 | 201.4 | Up | 07:10:39 - 07:40:39 | 8591 |
| Portola | 07:25:37 | -31.7 | Dark | Down | 34.9 | 202.0 | Up | 07:10:37 - 07:40:37 | 8573 |
| Reno | 07:25:35 | -32.0 | Dark | Down | 34.9 | 202.7 | Up | 07:10:35 - 07:40:35 | 8541 |
| Carson City | 07:25:35 | -32.4 | Dark | Down | 35.2 | 202.9 | Up | 07:10:35 - 07:40:35 | 8515 |
| Gardnerville | 07:25:34 | -32.6 | Dark | Down | 35.5 | 203.0 | Up | 07:10:34 - 07:40:34 | 8496 |
| Yerington | 07:25:32 | -32.7 | Dark | Down | 35.2 | 203.6 | Up | 07:10:32 - 07:40:32 | 8488 |
| Hawthorne | 07:25:29 | -33.2 | Dark | Down | 35.5 | 204.4 | Up | 07:10:29 - 07:40:29 | 8443 |
| Lee Vining | 07:25:32 | -33.7 | Dark | Down | 36.2 | 204.0 | Up | 07:10:32 - 07:40:32 | 8412 |
| Tonopah | 07:25:25 | -33.8 | Dark | Down | 35.5 | 206.1 | Up | 07:10:25 - 07:40:25 | 8379 |
| Bishop | 07:25:29 | -34.4 | Dark | Down | 36.5 | 205.0 | Up | 07:10:29 - 07:40:29 | 8351 |
| Beatty | 07:25:23 | -35.0 | Dark | Down | 36.3 | 206.9 | Up | 07:10:23 - 07:40:23 | 8281 |
| Dunrhomin | 07:24:45 | -31.9 | Dark | Up | 28.7 | 217.8 | Low | 07:09:45 - 07:39:45 | 8281 |
| CPSLO | 07:25:38 | -36.0 | Dark | Down | 39.1 | 203.0 | Up | 07:10:38 - 07:40:38 | 8241 |
| Indian Springs | 07:25:18 | -35.5 | Dark | Down | 36.2 | 208.2 | Up | 07:10:18 - 07:40:18 | 8233 |
| Henderson | 07:25:14 | -36.1 | Dark | Down | 36.4 | 209.2 | Up | 07:10:14 - 07:40:14 | 8176 |
| Wildwood | 07:25:29 | -37.6 | Dark | Down | 39.5 | 205.8 | Up | 07:10:29 - 07:40:29 | 8103 |
| Patrick | 07:25:10 | -36.8 | Dark | Down | 36.5 | 210.6 | Up | 07:10:10 - 07:40:10 | 8102 |
| Laughlin/Bullhead City | 07:25:13 | -37.0 | Dark | Down | 37.0 | 210.0 | Up | 07:10:13 - 07:40:13 | 8098 |
| Kingman/Dolan Springs | 07:25:11 | -37.0 | Dark | Down | 36.8 | 210.5 | Up | 07:10:11 - 07:40:11 | 8089 |
| Mohave Valley | 07:25:13 | -37.2 | Dark | Down | 37.3 | 210.1 | Up | 07:10:13 - 07:40:13 | 8077 |
| Lake Havasu City | 07:25:12 | -37.6 | Dark | Down | 37.5 | 210.5 | Up | 07:10:12 - 07:40:12 | 8039 |
| Idyllwild | 07:25:20 | -38.2 | Dark | Down | 39.1 | 208.1 | Up | 07:10:20 - 07:40:20 | 8033 |
| Parker | 07:25:11 | -38.0 | Dark | Down | 37.8 | 210.7 | Up | 07:10:11 - 07:40:11 | 8010 |
| Blythe | 07:25:12 | -38.5 | Dark | Down | 38.4 | 210.5 | Up | 07:10:12 - 07:40:12 | 7974 |
| Calipatria | 07:25:16 | -38.9 | Dark | Down | 39.2 | 209.7 | Up | 07:10:16 - 07:40:16 | 7956 |
| George/Scottsdale | 07:25:01 | -38.6 | Dark | Down | 37.1 | 213.5 | Up | 07:10:01 - 07:40:01 | 7920 |
| Yuma | 07:25:12 | -39.4 | Dark | Down | 39.2 | 210.9 | Up | 07:10:12 - 07:40:12 | 7900 |
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 503858, (2021/08/02 07:27UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 36.79 168 Nunki 18:55:15.9 -26:17:49 2.0 13.67 137 PPM 235105 18:50:31.2 -13:34:20 6.5 1.43 136 PPM 235280 18:57:25.6 -13:06:05 8.5 0.77 135 PPM 235203 18:54:27.2 -12:36:36 9.7 0.12 135 503858 18:54:56.1 -12:37:33 16.7 135 Positions are for J2000
Event circumstances last updated at 2021/01/24 20:49:26 UT
Marc W. Buie, Southwest Research Institute