RECON: TNO occultation with 5145

Event between (5145) Pholus and star GA0740:23691929 with event index number of 1493329

Geocentric closest approach at 2026/06/08 08:36:56 UTC

J2000 position of star is 18:48:11.7 -14:27:15
Equinox of date position of star is 18:49:27.8 -14:25:40
Stellar brightness G=15.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 65 degrees from the moon. Moon is 51% illuminated.
TNO apparent brightness V=22.0

[RECON map]
TNO is 30.6 AU from the Sun and 29.7 AU from the Earth.
The TNO is moving 23.3 km/sec on the sky relative to the star, or, 3.9 arcsec/hr.
The 1-sigma error in the time of the event is 135 seconds.
The 1-sigma cross-track error in the shadow position is 1474 km.
The sky-plane scale is 21515.8 km/arcsec.

The TNO has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 9.8 sec chord
Diameter=93.5 km assuming a 30% albedo -- 4.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 5145, (2026/06/08 08:37UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:02.0 -26:29:18  0.9 34.51  97
Nunki          18:56:54.1 -26:15:41  2.0 11.96  65
PPM 235105     18:52:00.8 -13:32:23  6.5  1.05  65
PPM 235043     18:49:42.1 -14:40:38  7.1  0.25  65
PPM 235028     18:49:12.3 -14:29:31  9.3  0.14  65
5145           18:49:41.9 -14:25:23 15.4        65
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 15.8 km RECON observability=1.0 and success probability=17.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 08:36:46 -12.3 AT Up 23.4 177.9 Low 08:25:04 - 08:48:29 1727
Kamloops 08:37:29 -16.0 AT Up 23.3 162.8 Low 08:25:47 - 08:49:12 1690
Kelowna 08:37:27 -16.7 AT Up 24.3 163.6 Low 08:25:45 - 08:49:10 1653
Peachland 08:37:28 -16.9 AT Up 24.3 163.3 Low 08:25:46 - 08:49:11 1648
Summerland 08:37:29 -17.0 AT Up 24.5 163.4 Low 08:25:46 - 08:49:11 1640
Penticton 08:37:28 -17.1 AT Up 24.6 163.5 Low 08:25:45 - 08:49:10 1637
Oliver 08:37:28 -17.4 AT Up 24.9 163.4 Low 08:25:46 - 08:49:11 1620
Anarchist Mountain Observatory 08:37:28 -17.6 AT Up 25.1 163.6 Low 08:25:45 - 08:49:10 1612
Tonasket 08:37:29 -17.9 AT Up 25.4 163.5 Low 08:25:46 - 08:49:11 1597
Victoria 08:37:41 -18.4 Dark Up 24.7 159.4 Low 08:25:58 - 08:49:23 1585
Okanogan 08:37:30 -18.2 Dark Up 25.7 163.3 Low 08:25:47 - 08:49:12 1580
Brewster 08:37:30 -18.5 Dark Up 25.9 163.1 Low 08:25:48 - 08:49:13 1566
Manson/Chelan 08:37:32 -18.7 Dark Up 26.0 162.6 Low 08:25:49 - 08:49:14 1556
Wenatchee 08:37:33 -19.2 Dark Up 26.4 162.4 Low 08:25:50 - 08:49:15 1531
Ellensburg 08:37:34 -19.7 Dark Up 26.8 162.1 Low 08:25:51 - 08:49:16 1510
Yakima 08:37:34 -20.1 Dark Up 27.2 162.0 Low 08:25:52 - 08:49:17 1488
Toppenish/White Swan 08:37:34 -20.3 Dark Up 27.4 162.2 Low 08:25:52 - 08:49:17 1477
PNWRO 08:37:30 -20.5 Dark Up 28.1 163.7 Low 08:25:47 - 08:49:12 1457
Goldendale 08:37:36 -20.9 Dark Up 27.9 161.6 Low 08:25:54 - 08:49:19 1447
The Dalles 08:37:38 -21.1 Dark Up 28.0 161.2 Low 08:25:55 - 08:49:20 1434
Maupin 08:37:38 -21.5 Dark Up 28.4 161.2 Low 08:25:55 - 08:49:20 1412
Sisters 08:37:40 -22.4 Dark Up 29.1 160.6 Low 08:25:58 - 08:49:23 1362
Bend 08:37:40 -22.6 Dark Up 29.4 160.8 Low 08:25:57 - 08:49:22 1349
Oregon Observatory 08:37:40 -22.8 Dark Up 29.6 160.6 Low 08:25:58 - 08:49:23 1339
North Lake 08:37:39 -23.4 Dark Up 30.3 161.1 Up 08:25:57 - 08:49:22 1302
Chiloquin 08:37:43 -24.2 Dark Up 30.7 159.9 Up 08:26:01 - 08:49:26 1262
Klamath Falls 08:37:43 -24.5 Dark Up 31.0 160.0 Up 08:26:01 - 08:49:26 1241
Lakeview 08:37:39 -24.4 Dark Up 31.4 161.5 Up 08:25:56 - 08:49:21 1240
Cedarville 08:37:39 -25.0 Dark Up 32.1 161.6 Up 08:25:56 - 08:49:21 1200
Fall River/Burney 08:37:43 -25.6 Dark Up 32.2 160.1 Up 08:26:01 - 08:49:26 1169
Susanville 08:37:42 -26.2 Dark Up 33.0 160.8 Up 08:25:59 - 08:49:24 1130
Greenville 08:37:43 -26.5 Dark Up 33.2 160.4 Up 08:26:00 - 08:49:25 1113
Gimple 08:37:43 -26.5 Dark Up 33.2 160.5 Up 08:26:00 - 08:49:25 1113
Quincy 08:37:43 -26.7 Dark Up 33.4 160.4 Up 08:26:01 - 08:49:26 1100
Portola 08:37:42 -26.7 Dark Up 33.6 160.9 Up 08:25:59 - 08:49:24 1092
Dunrhomin 08:36:47 -23.0 Dark Up 35.3 178.5 Up 08:25:04 - 08:48:29 1083
Reno 08:37:40 -26.9 Dark Up 34.1 161.6 Up 08:25:57 - 08:49:22 1075
CU-SBO 08:36:48 -23.2 Dark Up 35.5 178.4 Up 08:25:05 - 08:48:30 1068
Carson City 08:37:40 -27.3 Dark Up 34.4 161.5 Up 08:25:57 - 08:49:22 1052
Yerington 08:37:38 -27.4 Dark Up 34.7 162.2 Up 08:25:56 - 08:49:21 1039
Gardnerville 08:37:40 -27.5 Dark Up 34.6 161.5 Up 08:25:58 - 08:49:23 1036
Hawthorne 08:37:37 -27.8 Dark Up 35.3 162.7 Up 08:25:54 - 08:49:19 1009
Tonopah 08:37:32 -28.0 Dark Up 36.1 164.2 Up 08:25:49 - 08:49:14 977
Lee Vining 08:37:39 -28.4 Dark Up 35.7 162.0 Up 08:25:56 - 08:49:21 972
Bishop 08:37:37 -28.9 Dark Up 36.5 162.7 Up 08:25:54 - 08:49:19 931
Beatty 08:37:31 -29.0 Dark Up 37.3 164.5 Up 08:25:49 - 08:49:14 898
Indian Springs 08:37:28 -29.1 Dark Up 37.8 165.7 Up 08:25:45 - 08:49:10 874
Henderson 08:37:26 -29.5 Dark Up 38.5 166.4 Up 08:25:43 - 08:49:08 835
Patrick 08:37:21 -29.9 Dark Up 39.3 167.7 Up 08:25:39 - 08:49:04 789
Kingman/Dolan Springs 08:37:22 -30.1 Dark Up 39.5 167.4 Up 08:25:40 - 08:49:05 774
Laughlin/Bullhead City 08:37:24 -30.3 Dark Up 39.4 166.8 Up 08:25:42 - 08:49:07 773
Mohave Valley 08:37:24 -30.5 Dark Up 39.7 166.7 Up 08:25:42 - 08:49:07 753
Lake Havasu City 08:37:24 -30.8 Dark Up 40.1 167.0 Up 08:25:41 - 08:49:06 724
Wildwood 08:37:40 -32.1 Dark Up 39.5 161.7 Up 08:25:58 - 08:49:23 700
Parker 08:37:24 -31.2 Dark Up 40.4 166.9 Up 08:25:42 - 08:49:07 698
Idyllwild 08:37:34 -32.1 Dark Up 40.3 163.9 Up 08:25:51 - 08:49:16 673
George/Scottsdale 08:37:10 -31.0 Dark Up 41.3 169.9 Up 08:25:27 - 08:48:52 673
Calipatria 08:37:29 -32.4 Dark Up 41.2 165.2 Up 08:25:47 - 08:49:12 626
Yuma 08:37:26 -32.6 Dark Up 41.8 166.2 Up 08:25:44 - 08:49:09 592

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, (2026/06/08 08:37UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 34.51  97
Nunki          18:55:15.9 -26:17:49  2.0 11.96  65
PPM 235105     18:50:31.2 -13:34:20  6.5  1.05  65
PPM 235043     18:48:11.7 -14:42:31  7.1  0.25  65
PPM 235028     18:47:42.1 -14:31:22  9.3  0.14  65
5145           18:48:11.7 -14:27:15 15.4        65
Positions are for J2000

Event circumstances last updated at 2022/04/19 23:11:58 UT

Marc W. Buie, Southwest Research Institute

RECON