RECON: TNO occultation with 13TP187

Event between 13TP187 and star GA0880:00295432 with event index number of 2728746

Geocentric closest approach at 2025/10/07 06:41:28 UTC

J2000 position of star is 03:14:09.7 -01:29:06
Equinox of date position of star is 03:15:16.5 -01:24:16
Stellar brightness G=15.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 36 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=23.2

[RECON map]
TNO is 41.7 AU from the Sun and 40.9 AU from the Earth.
The TNO is moving 21.9 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 210 seconds.
The 1-sigma cross-track error in the shadow position is 3148 km.
The sky-plane scale is 29690.8 km/arcsec.

The TNO has an absolute magnitude Hv=6.9
Diameter=245.5 km assuming a 5% albedo -- 11.2 sec chord
Diameter=100.2 km assuming a 30% albedo -- 4.6 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 13TP187, (2025/10/07 06:41UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.1 +16:33:33  0.8 27.03  54
Menkar         03:03:37.8 +04:11:22  2.5  6.32  32
94 Cet         03:14:05.4 -01:06:04  5.1  0.45  36
PPM 175272     03:16:41.5 -01:05:05  8.5  0.43  36
13TP187        03:15:28.3 -01:23:25 15.0        36
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 4.3 sigma about the mid-time.
The median site spacing is 8.4 km RECON observability=1.0 and success probability=6.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Victoria 06:41:32 -43.9 Dark Up 20.9 118.3 Low 06:26:32 - 06:56:32 3424
Kamloops 06:41:18 -42.8 Dark Up 21.5 121.6 Low 06:26:18 - 06:56:18 3394
Peachland 06:41:21 -43.8 Dark Up 22.3 121.9 Low 06:26:21 - 06:56:21 3363
Summerland 06:41:22 -43.9 Dark Up 22.4 121.9 Low 06:26:22 - 06:56:22 3357
Kelowna 06:41:20 -43.7 Dark Up 22.4 122.2 Low 06:26:20 - 06:56:20 3357
Penticton 06:41:22 -44.0 Dark Up 22.5 122.0 Low 06:26:22 - 06:56:22 3353
Oliver 06:41:23 -44.3 Dark Up 22.7 121.9 Low 06:26:23 - 06:56:23 3346
Anarchist Mountain Observatory 06:41:24 -44.6 Dark Up 22.9 122.0 Low 06:26:24 - 06:56:24 3338
Manson/Chelan 06:41:30 -45.4 Dark Up 23.1 120.9 Low 06:26:30 - 06:56:30 3333
Tonasket 06:41:25 -44.8 Dark Up 23.1 121.8 Low 06:26:25 - 06:56:25 3333
Okanogan 06:41:27 -45.1 Dark Up 23.2 121.6 Low 06:26:27 - 06:56:27 3329
Brewster 06:41:28 -45.3 Dark Up 23.2 121.3 Low 06:26:28 - 06:56:28 3328
Wenatchee 06:41:32 -45.8 Dark Up 23.2 120.6 Low 06:26:32 - 06:56:32 3326
Ellensburg 06:41:34 -46.1 Dark Up 23.3 120.2 Low 06:26:34 - 06:56:34 3323
Yakima 06:41:37 -46.5 Dark Up 23.5 120.1 Low 06:26:37 - 06:56:37 3313
The Dalles 06:41:42 -47.2 Dark Up 23.6 119.2 Low 06:26:42 - 06:56:42 3303
Toppenish/White Swan 06:41:37 -46.7 Dark Up 23.7 120.1 Low 06:26:37 - 06:56:37 3303
Goldendale 06:41:40 -47.1 Dark Up 23.8 119.6 Low 06:26:40 - 06:56:40 3300
Maupin 06:41:44 -47.6 Dark Up 23.9 119.1 Low 06:26:44 - 06:56:44 3290
Sisters 06:41:48 -48.2 Dark Up 24.1 118.4 Low 06:26:48 - 06:56:48 3279
Redmond 06:41:48 -48.4 Dark Up 24.3 118.7 Low 06:26:48 - 06:56:48 3268
Pasco 06:41:35 -47.2 Dark Up 24.5 121.2 Low 06:26:35 - 06:56:35 3267
Bend 06:41:49 -48.5 Dark Up 24.3 118.5 Low 06:26:49 - 06:56:49 3265
Oregon Observatory 06:41:50 -48.6 Dark Up 24.3 118.3 Low 06:26:50 - 06:56:50 3264
La Pine/Gilchrist 06:41:50 -48.8 Dark Up 24.4 118.2 Low 06:26:50 - 06:56:50 3259
PNWRO 06:41:36 -47.5 Dark Up 24.8 121.3 Low 06:26:36 - 06:56:36 3255
Chiloquin 06:41:56 -49.6 Dark Up 24.7 117.5 Low 06:26:56 - 06:56:56 3235
North Lake 06:41:52 -49.4 Dark Up 25.0 118.5 Low 06:26:52 - 06:56:52 3231
Klamath Falls 06:41:58 -50.0 Dark Up 24.9 117.4 Low 06:26:58 - 06:56:58 3222
Paisley 06:41:53 -50.0 Dark Up 25.5 118.6 Low 06:26:53 - 06:56:53 3204
Lakeview 06:41:55 -50.5 Dark Up 25.9 118.6 Low 06:26:55 - 06:56:55 3182
Fall River/Burney 06:42:02 -51.1 Dark Up 25.7 117.2 Low 06:27:02 - 06:57:02 3173
Cedarville 06:41:57 -51.1 Dark Up 26.3 118.4 Low 06:26:57 - 06:56:57 3156
Susanville 06:42:03 -52.0 Dark Up 26.5 117.6 Low 06:27:03 - 06:57:03 3131
Greenville 06:42:05 -52.1 Dark Up 26.4 117.2 Low 06:27:05 - 06:57:05 3129
Gimple 06:42:05 -52.1 Dark Up 26.5 117.3 Low 06:27:05 - 06:57:05 3126
Quincy 06:42:06 -52.3 Dark Up 26.5 117.1 Low 06:27:06 - 06:57:06 3121
Portola 06:42:05 -52.6 Dark Up 26.9 117.5 Low 06:27:05 - 06:57:05 3104
Reno 06:42:05 -53.0 Dark Up 27.5 117.9 Low 06:27:05 - 06:57:05 3075
Carson City 06:42:07 -53.4 Dark Up 27.7 117.7 Low 06:27:07 - 06:57:07 3061
Gardnerville 06:42:08 -53.6 Dark Up 27.8 117.7 Low 06:27:08 - 06:57:08 3050
Yerington 06:42:06 -53.8 Dark Up 28.2 118.2 Low 06:27:06 - 06:57:06 3035
Sleaford 06:40:46 -43.5 Dark Up 27.6 135.9 Low 06:25:46 - 06:55:46 3034
Hawthorne 06:42:07 -54.4 Dark Up 28.8 118.4 Low 06:27:07 - 06:57:07 3001
Lee Vining 06:42:11 -54.7 Dark Up 28.7 117.7 Low 06:27:11 - 06:57:11 2994
Bishop 06:42:12 -55.5 Dark Up 29.5 118.0 Low 06:27:12 - 06:57:12 2946
Tonopah 06:42:06 -55.3 Dark Up 30.0 119.3 Low 06:27:06 - 06:57:06 2939
CPSLO 06:42:25 -56.4 Dark Up 28.8 115.2 Low 06:27:25 - 06:57:25 2926
Beatty 06:42:10 -56.5 Dark Up 30.9 119.1 Up 06:27:10 - 06:57:10 2875
Indian Springs 06:42:09 -57.1 Dark Up 31.8 119.9 Up 06:27:09 - 06:57:09 2825
Wildwood 06:42:26 -58.3 Dark Up 30.9 116.2 Up 06:27:26 - 06:57:26 2807
Henderson 06:42:09 -57.8 Dark Up 32.5 120.2 Up 06:27:09 - 06:57:09 2778
Idyllwild 06:42:23 -59.4 Dark Up 32.5 117.5 Up 06:27:23 - 06:57:23 2729
Laughlin/Bullhead City 06:42:12 -58.8 Dark Up 33.3 120.0 Up 06:27:12 - 06:57:12 2723
Patrick 06:42:09 -58.7 Dark Up 33.6 120.8 Up 06:27:09 - 06:57:09 2711
Mohave Valley 06:42:13 -59.0 Dark Up 33.4 119.9 Up 06:27:13 - 06:57:13 2710
Kingman/Dolan Springs 06:42:11 -58.9 Dark Up 33.6 120.5 Up 06:27:11 - 06:57:11 2707
Lake Havasu City 06:42:14 -59.5 Dark Up 33.8 119.9 Up 06:27:14 - 06:57:14 2683
Parker 06:42:16 -59.8 Dark Up 34.0 119.7 Up 06:27:16 - 06:57:16 2664
Calipatria 06:42:23 -60.4 Dark Up 33.6 118.1 Up 06:27:23 - 06:57:23 2657
Blythe 06:42:19 -60.2 Dark Up 34.1 119.1 Up 06:27:19 - 06:57:19 2649
Dunrhomin 06:41:29 -55.3 Dark Up 36.2 131.5 Up 06:26:29 - 06:56:29 2613
Yuma 06:42:22 -61.1 Dark Up 34.5 118.6 Up 06:27:22 - 06:57:22 2604
George/Scottsdale 06:42:12 -60.9 Dark Up 35.9 121.5 Up 06:27:12 - 06:57:12 2556

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 13TP187, (2025/10/07 06:41UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 27.03  54
Menkar         03:02:16.8 +04:05:21  2.5  6.32  32
94 Cet         03:12:46.7 -01:11:47  5.1  0.45  36
PPM 175272     03:15:22.8 -01:10:44  8.5  0.43  36
13TP187        03:14:09.7 -01:29:06 15.0        36
Positions are for J2000

Event circumstances last updated at 2021/12/02 02:41:06 UT

Marc W. Buie, Southwest Research Institute

RECON