RECON: TNO occultation with 13RJ124

Event between 13RJ124 and star GA0980:00175615 with event index number of 2008306

Geocentric closest approach at 2025/10/19 11:45:08 UTC

J2000 position of star is 02:03:12.5 +08:11:15
Equinox of date position of star is 02:04:22.0 +08:17:31
Stellar brightness G=14.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 152 degrees from the moon. Moon is 4% illuminated.
TNO apparent brightness V=22.8

[RECON map]
TNO is 45.3 AU from the Sun and 44.3 AU from the Earth.
The TNO is moving 25.5 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 321 seconds.
The 1-sigma cross-track error in the shadow position is 3925 km.
The sky-plane scale is 32106.1 km/arcsec.

The TNO has an absolute magnitude Hv=6.3
Diameter=334.2 km assuming a 5% albedo -- 13.1 sec chord
Diameter=136.4 km assuming a 30% albedo -- 5.4 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 13RJ124, (2025/10/19 11:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.2 +16:33:33  0.8 38.14 114
68Omi Cet      02:20:39.1 -02:51:42  2.0 11.87 148
65Xi 1Cet      02:14:22.3 +08:58:00  4.4  2.51 149
PPM 145259     02:05:22.1 +08:13:03  8.1  0.22 152
13RJ124        02:04:34.4 +08:18:38 14.8       152
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 2.8 sigma about the mid-time.
The median site spacing is 26.5 km RECON observability=1.0 and success probability=11.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 11:41:50 -18.2 Dark Up 20.5 256.5 Low 11:26:50 - 11:56:50 -2416
Kamloops 11:42:08 -27.3 Dark Down 29.4 244.5 Low 11:27:08 - 11:57:08 -2493
Kelowna 11:42:06 -27.0 Dark Down 29.3 245.7 Low 11:27:06 - 11:57:06 -2578
Peachland 11:42:06 -27.2 Dark Down 29.5 245.5 Low 11:27:06 - 11:57:06 -2586
Summerland 11:42:06 -27.2 Dark Down 29.5 245.7 Low 11:27:06 - 11:57:06 -2601
Penticton 11:42:06 -27.1 Dark Down 29.4 245.8 Low 11:27:06 - 11:57:06 -2609
Oliver 11:42:05 -27.3 Dark Down 29.6 246.0 Low 11:27:05 - 11:57:05 -2643
Anarchist Mountain Observatory 11:42:04 -27.2 Dark Down 29.6 246.2 Low 11:27:04 - 11:57:04 -2661
Victoria 11:42:11 -29.9 Dark Down 32.2 242.8 Up 11:27:11 - 11:57:11 -2676
Tonasket 11:42:04 -27.3 Dark Down 29.7 246.3 Low 11:27:04 - 11:57:04 -2691
Okanogan 11:42:04 -27.5 Dark Down 29.9 246.4 Low 11:27:04 - 11:57:04 -2723
Brewster 11:42:04 -27.7 Dark Down 30.2 246.3 Up 11:27:04 - 11:57:04 -2748
Manson/Chelan 11:42:04 -28.0 Dark Down 30.5 246.1 Up 11:27:04 - 11:57:04 -2766
Wenatchee 11:42:04 -28.3 Dark Down 30.8 246.2 Up 11:27:04 - 11:57:04 -2811
Ellensburg 11:42:04 -28.5 Dark Down 31.1 246.3 Up 11:27:04 - 11:57:04 -2850
Yakima 11:42:03 -28.7 Dark Down 31.3 246.5 Up 11:27:03 - 11:57:03 -2891
Toppenish/White Swan 11:42:03 -28.6 Dark Down 31.2 246.7 Up 11:27:03 - 11:57:03 -2914
Pasco 11:42:00 -27.8 Dark Down 30.5 247.9 Up 11:27:00 - 11:57:00 -2936
PNWRO 11:42:00 -27.7 Dark Down 30.4 248.2 Up 11:27:00 - 11:57:00 -2962
Goldendale 11:42:03 -29.0 Dark Down 31.7 246.7 Up 11:27:03 - 11:57:03 -2966
The Dalles 11:42:03 -29.3 Dark Down 32.1 246.5 Up 11:27:03 - 11:57:03 -2985
Maupin 11:42:03 -29.4 Dark Down 32.2 246.8 Up 11:27:03 - 11:57:03 -3028
Sisters 11:42:03 -30.0 Dark Down 32.8 246.9 Up 11:27:03 - 11:57:03 -3113
Redmond 11:42:01 -29.7 Dark Down 32.6 247.2 Up 11:27:01 - 11:57:01 -3119
Bend 11:42:02 -29.9 Dark Down 32.7 247.2 Up 11:27:02 - 11:57:02 -3139
Oregon Observatory 11:42:02 -30.0 Dark Down 32.9 247.2 Up 11:27:02 - 11:57:02 -3155
La Pine/Gilchrist 11:42:02 -30.1 Dark Down 33.0 247.3 Up 11:27:02 - 11:57:02 -3176
North Lake 11:42:00 -29.8 Dark Down 32.8 248.1 Up 11:27:00 - 11:57:00 -3225
Paisley 11:41:59 -29.7 Dark Down 32.7 248.7 Up 11:26:59 - 11:56:59 -3285
Chiloquin 11:42:02 -30.7 Dark Down 33.7 247.7 Up 11:27:02 - 11:57:02 -3286
Klamath Falls 11:42:01 -30.7 Dark Down 33.8 248.0 Up 11:27:01 - 11:57:01 -3322
Lakeview 11:41:58 -29.7 Dark Down 32.8 249.2 Up 11:26:58 - 11:56:58 -3339
Cedarville 11:41:57 -29.7 Dark Down 32.9 249.7 Up 11:26:57 - 11:56:57 -3408
Fall River/Burney 11:41:59 -30.7 Dark Down 33.9 249.0 Up 11:26:59 - 11:56:59 -3447
Susanville 11:41:57 -30.3 Dark Down 33.6 250.0 Up 11:26:57 - 11:56:57 -3519
Greenville 11:41:57 -30.6 Dark Down 33.9 249.9 Up 11:26:57 - 11:56:57 -3545
Gimple 11:41:57 -30.5 Dark Down 33.9 250.0 Up 11:26:57 - 11:56:57 -3546
Quincy 11:41:57 -30.7 Dark Down 34.0 250.1 Up 11:26:57 - 11:56:57 -3567
Portola 11:41:56 -30.3 Dark Down 33.7 250.5 Up 11:26:56 - 11:56:56 -3584
Dunrhomin 11:41:31 -18.7 Dark Up 22.3 261.6 Low 11:26:31 - 11:56:31 -3612
Reno 11:41:55 -29.9 Dark Down 33.3 251.2 Up 11:26:55 - 11:56:55 -3618
Carson City 11:41:54 -30.0 Dark Down 33.4 251.5 Up 11:26:54 - 11:56:54 -3655
Yerington 11:41:53 -29.5 Dark Down 33.0 252.1 Up 11:26:53 - 11:56:53 -3681
Gardnerville 11:41:53 -30.0 Dark Down 33.5 251.7 Up 11:26:53 - 11:56:53 -3681
Hawthorne 11:41:51 -29.2 Dark Down 32.8 252.8 Up 11:26:51 - 11:56:51 -3735
Lee Vining 11:41:52 -29.7 Dark Down 33.3 252.8 Up 11:26:52 - 11:56:52 -3790
Tonopah 11:41:48 -28.2 Dark Down 31.8 254.1 Up 11:26:48 - 11:56:48 -3795
Bishop 11:41:50 -29.2 Dark Down 32.9 253.7 Up 11:26:50 - 11:56:50 -3859
Beatty 11:41:46 -28.0 Dark Down 31.8 255.2 Up 11:26:46 - 11:56:46 -3921
Indian Springs 11:41:44 -27.2 Dark Down 31.1 256.1 Up 11:26:44 - 11:56:44 -3964
Henderson 11:41:42 -26.8 Dark Down 30.6 256.9 Up 11:26:42 - 11:56:42 -4026
CPSLO 11:41:53 -31.4 Dark Down 35.3 253.3 Up 11:26:53 - 11:56:53 -4059
Patrick 11:41:40 -25.9 Dark Down 29.9 258.0 Low 11:26:40 - 11:56:40 -4100
Laughlin/Bullhead City 11:41:41 -26.5 Dark Down 30.5 257.7 Up 11:26:41 - 11:56:41 -4122
Kingman/Dolan Springs 11:41:40 -26.1 Dark Down 30.1 258.0 Up 11:26:40 - 11:56:40 -4122
Mohave Valley 11:41:41 -26.6 Dark Down 30.6 257.9 Up 11:26:41 - 11:56:41 -4151
Lake Havasu City 11:41:40 -26.4 Dark Down 30.5 258.3 Up 11:26:40 - 11:56:40 -4196
Wildwood 11:41:48 -29.9 Dark Down 34.0 255.6 Up 11:26:48 - 11:56:48 -4208
Parker 11:41:40 -26.4 Dark Down 30.5 258.5 Up 11:26:40 - 11:56:40 -4234
Idyllwild 11:41:44 -28.4 Dark Down 32.5 257.1 Up 11:26:44 - 11:56:44 -4261
Blythe 11:41:40 -26.7 Dark Down 30.9 258.6 Up 11:26:40 - 11:56:40 -4289
George/Scottsdale 11:41:35 -24.4 Dark Down 28.6 260.3 Low 11:26:35 - 11:56:35 -4293
Calipatria 11:41:41 -27.5 Dark Down 31.7 258.3 Up 11:26:41 - 11:56:41 -4336
Yuma 11:41:39 -26.8 Dark Down 31.1 259.1 Up 11:26:39 - 11:56:39 -4389

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 13RJ124, (2025/10/19 11:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 38.14 114
68Omi Cet      02:19:20.8 -02:58:45  2.0 11.87 148
65Xi 1Cet      02:13:00.0 +08:50:48  4.4  2.51 149
PPM 145259     02:04:00.2 +08:05:41  8.1  0.22 152
13RJ124        02:03:12.5 +08:11:15 14.8       152
Positions are for J2000

Event circumstances last updated at 2021/11/27 00:59:58 UT

Marc W. Buie, Southwest Research Institute

RECON