Event between (5145) Pholus and star GA0740:20262781 with event index number of 1492921
Geocentric closest approach at 2025/08/18 03:59:54 UTC
J2000 position of star is 18:34:45.5 -14:17:02
Equinox of date position of star is 18:36:09.0 -14:15:46
Stellar brightness G=15.4,
use SENSEUP=128 with the MallinCam and and exposure
time of 2 seconds with the QHY174 camera.
Star is 158 degrees from the moon.
Moon is 29% illuminated.
Apparent brightness V=22.0
[RECON map]
Object is 30.4 AU from the Sun
and 29.7 AU from the Earth.
Apparent velocity is 17.3
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 153 seconds.
The 1-sigma cross-track error in the shadow position is
1819 km.
The sky-plane scale is
21524.1 km/arcsec.
The object has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 13.4 sec chord
Diameter=93.5 km assuming a 30% albedo -- 5.5 sec chord
Dynamical classification is CENTAURR
Star training set for 5145, (2025/08/18 04:00UT) Object RA Dec mag sep mel Antares 16:30:59.0 -26:29:12 0.9 31.68 169 Nunki 18:56:51.1 -26:15:45 2.0 12.94 159 PPM 234707 18:35:06.9 -14:49:57 6.1 0.63 158 PPM 234710 18:35:18.3 -14:24:16 8.3 0.26 158 5145 18:36:13.0 -14:15:43 15.4 157 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 15.3 km
RECON observability=0.2 and success probability=0.0%
| Site | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time (UT) |
X-track (km) |
| Kamloops | 03:58:52 | -6.8 | NT | Down | 24.1 | 166.7 | Low | 03:45:36 - 04:12:08 | 9669 |
| Victoria | 03:59:10 | -6.2 | NT | Down | 25.7 | 163.3 | Low | 03:45:54 - 04:12:26 | 9641 |
| Peachland | 03:58:54 | -7.6 | NT | Down | 25.1 | 167.2 | Low | 03:45:38 - 04:12:10 | 9621 |
| Kelowna | 03:58:53 | -7.8 | NT | Down | 25.0 | 167.5 | Low | 03:45:37 - 04:12:09 | 9619 |
| Summerland | 03:58:54 | -7.8 | NT | Down | 25.3 | 167.3 | Low | 03:45:38 - 04:12:10 | 9613 |
| Penticton | 03:58:54 | -7.9 | NT | Down | 25.3 | 167.4 | Low | 03:45:38 - 04:12:10 | 9608 |
| Oliver | 03:58:54 | -8.1 | NT | Down | 25.7 | 167.4 | Low | 03:45:38 - 04:12:10 | 9594 |
| Anarchist Mountain Observatory | 03:58:53 | -8.2 | NT | Down | 25.9 | 167.5 | Low | 03:45:37 - 04:12:09 | 9583 |
| Okanogan | 03:58:56 | -8.5 | NT | Down | 26.5 | 167.2 | Low | 03:45:40 - 04:12:12 | 9560 |
| Brewster | 03:58:58 | -8.5 | NT | Down | 26.7 | 167.0 | Low | 03:45:42 - 04:12:14 | 9552 |
| Manson/Chelan | 03:58:59 | -8.4 | NT | Down | 26.9 | 166.6 | Low | 03:45:43 - 04:12:15 | 9551 |
| Wenatchee | 03:59:01 | -8.5 | NT | Down | 27.3 | 166.4 | Low | 03:45:45 - 04:12:17 | 9533 |
| Ellensburg | 03:59:03 | -8.6 | NT | Down | 27.7 | 166.1 | Low | 03:45:47 - 04:12:19 | 9519 |
| Yakima | 03:59:03 | -8.8 | NT | Down | 28.1 | 166.0 | Low | 03:45:47 - 04:12:19 | 9501 |
| Toppenish/White Swan | 03:59:04 | -9.0 | NT | Down | 28.3 | 166.2 | Low | 03:45:48 - 04:12:20 | 9488 |
| The Dalles | 03:59:07 | -8.9 | NT | Down | 28.9 | 165.2 | Low | 03:45:51 - 04:12:23 | 9468 |
| Maupin | 03:59:09 | -9.2 | NT | Down | 29.3 | 165.3 | Low | 03:45:53 - 04:12:25 | 9446 |
| PNWRO | 03:58:58 | -10.1 | NT | Down | 28.9 | 167.7 | Low | 03:45:42 - 04:12:14 | 9439 |
| Sleaford | 03:57:59 | -13.1 | AT | Down | 23.6 | 181.8 | Low | 03:44:43 - 04:11:15 | 9420 |
| Sisters | 03:59:12 | -9.3 | NT | Down | 30.1 | 164.6 | Up | 03:45:56 - 04:12:28 | 9414 |
| Bend | 03:59:11 | -9.6 | NT | Down | 30.4 | 164.9 | Up | 03:45:55 - 04:12:27 | 9397 |
| Oregon Observatory | 03:59:13 | -9.6 | NT | Down | 30.5 | 164.7 | Up | 03:45:57 - 04:12:29 | 9392 |
| Chiloquin | 03:59:18 | -10.0 | NT | Down | 31.7 | 164.1 | Up | 03:46:02 - 04:12:34 | 9334 |
| Klamath Falls | 03:59:18 | -10.2 | NT | Down | 32.1 | 164.1 | Up | 03:46:02 - 04:12:34 | 9314 |
| Fall River/Burney | 03:59:19 | -11.0 | NT | Down | 33.3 | 164.3 | Up | 03:46:03 - 04:12:35 | 9243 |
| Cedarville | 03:59:12 | -11.6 | NT | Down | 33.0 | 165.8 | Up | 03:45:56 - 04:12:28 | 9242 |
| Greenville | 03:59:19 | -11.7 | NT | Down | 34.2 | 164.7 | Up | 03:46:03 - 04:12:35 | 9183 |
| Gimple | 03:59:17 | -11.8 | NT | Down | 34.3 | 164.8 | Up | 03:46:01 - 04:12:33 | 9180 |
| Quincy | 03:59:18 | -11.8 | NT | Down | 34.4 | 164.6 | Up | 03:46:02 - 04:12:34 | 9171 |
| Portola | 03:59:17 | -12.2 | AT | Down | 34.7 | 165.2 | Up | 03:46:01 - 04:12:33 | 9153 |
| Reno | 03:59:15 | -12.8 | AT | Down | 35.0 | 165.9 | Up | 03:45:59 - 04:12:31 | 9123 |
| Carson City | 03:59:16 | -13.0 | AT | Down | 35.4 | 165.8 | Up | 03:46:00 - 04:12:32 | 9102 |
| Gardnerville | 03:59:15 | -13.1 | AT | Down | 35.6 | 165.8 | Up | 03:45:59 - 04:12:31 | 9086 |
| Yerington | 03:59:12 | -13.5 | AT | Down | 35.7 | 166.5 | Up | 03:45:56 - 04:12:28 | 9075 |
| Hawthorne | 03:59:11 | -14.1 | AT | Down | 36.2 | 167.1 | Up | 03:45:55 - 04:12:27 | 9035 |
| Lee Vining | 03:59:14 | -14.0 | AT | Down | 36.7 | 166.4 | Up | 03:45:58 - 04:12:30 | 9014 |
| Bishop | 03:59:13 | -14.8 | AT | Down | 37.4 | 167.1 | Up | 03:45:57 - 04:12:29 | 8959 |
| Beatty | 03:59:06 | -16.1 | AT | Down | 38.1 | 169.0 | Up | 03:45:50 - 04:12:22 | 8889 |
| Dunrhomin | 03:58:07 | -21.4 | Dark | Down | 35.4 | 182.9 | Up | 03:44:51 - 04:11:23 | 8780 |
| Nikitin | 03:58:07 | -21.5 | Dark | Down | 35.6 | 182.9 | Up | 03:44:51 - 04:11:23 | 8770 |
| CU-SBO | 03:58:07 | -21.5 | Dark | Down | 35.7 | 182.8 | Up | 03:44:51 - 04:11:23 | 8768 |
| Wildwood | 03:59:20 | -16.3 | AT | Down | 40.6 | 166.3 | Up | 03:46:04 - 04:12:36 | 8756 |
| Laughlin/Bullhead City | 03:58:58 | -18.5 | Dark | Down | 40.1 | 171.4 | Up | 03:45:42 - 04:12:14 | 8720 |
| Patrick | 03:58:55 | -18.9 | Dark | Down | 40.0 | 172.3 | Up | 03:45:39 - 04:12:11 | 8717 |
| Idyllwild | 03:59:13 | -17.8 | AT | Down | 41.3 | 168.6 | Up | 03:45:57 - 04:12:29 | 8684 |
| Lake Havasu City | 03:58:58 | -19.1 | Dark | Down | 40.8 | 171.7 | Up | 03:45:42 - 04:12:14 | 8668 |
| Calipatria | 03:59:07 | -18.9 | Dark | Down | 42.0 | 170.0 | Up | 03:45:51 - 04:12:23 | 8609 |
| Yuma | 03:59:04 | -19.8 | Dark | Down | 42.6 | 171.1 | Up | 03:45:48 - 04:12:20 | 8554 |
| George/Scottsdale | 03:58:48 | -21.2 | Dark | Down | 41.8 | 174.7 | Up | 03:45:32 - 04:12:04 | 8547 |
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 5145, (2025/08/18 04:00UT) Object RA Dec mag sep mel Antares 16:29:24.4 -26:25:56 0.9 31.68 169 Nunki 18:55:15.9 -26:17:49 2.0 12.94 159 PPM 234707 18:33:39.1 -14:51:14 6.1 0.63 158 PPM 234710 18:33:50.8 -14:25:33 8.3 0.26 158 5145 18:34:45.5 -14:17:02 15.4 158 Positions are for J2000
Event circumstances last updated at 2024/06/18 02:52:53 UT
Marc W. Buie, Southwest Research Institute