RECON: TNO occultation with 523680

Event between (523680) 13YJ151 and star GA1060:03118475 with event index number of 2624757

Geocentric closest approach at 2026/02/11 07:42:33 UTC

J2000 position of star is 08:30:11.0 +16:42:51
Equinox of date position of star is 08:31:33.0 +16:37:54
Stellar brightness G=12.6, use SENSEUP=16 with the MallinCam and and exposure time of 250 milli-seconds with the QHY174 camera.
Star is 126 degrees from the moon. Moon is 34% illuminated.
Apparent brightness V=22.1

[RECON map]
Object is 44.4 AU from the Sun and 43.4 AU from the Earth.
Apparent velocity is 24.9 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 76 seconds.
The 1-sigma cross-track error in the shadow position is 1923 km.
The sky-plane scale is 31483.0 km/arcsec.

The object has an absolute magnitude Hv=5.6
Diameter=457.1 km assuming a 5% albedo -- 18.6 sec chord
Diameter=186.6 km assuming a 30% albedo -- 7.6 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 523680, (2026/02/11 07:41UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:54.8 +27:57:40  1.1 15.33 139
25 Cnc         08:27:18.4 +16:57:31  6.2  1.09 127
PPM 125386     08:33:47.6 +16:07:22  8.4  0.72 125
PPM 125337     08:31:43.9 +16:34:27 10.0  0.05 126
523680         08:31:39.6 +16:37:30 12.6       125
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 31.8 km RECON observability=1.0 and success probability=3.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 07:41:53 -51.6 Dark Down 50.1 216.3 Up 07:35:05 - 07:48:41 4792
Kamloops 07:42:29 -52.7 Dark Down 55.3 195.4 Up 07:35:41 - 07:49:17 4456
Kelowna 07:42:26 -53.6 Dark Down 55.9 197.2 Up 07:35:38 - 07:49:14 4395
Peachland 07:42:27 -53.7 Dark Down 56.0 196.8 Up 07:35:39 - 07:49:15 4381
Summerland 07:42:26 -53.8 Dark Down 56.2 197.0 Up 07:35:38 - 07:49:14 4369
Penticton 07:42:26 -53.9 Dark Down 56.2 197.2 Up 07:35:38 - 07:49:14 4364
Oliver 07:42:25 -54.3 Dark Down 56.6 197.4 Up 07:35:37 - 07:49:13 4332
Anarchist Mountain Observatory 07:42:24 -54.5 Dark Down 56.7 197.8 Up 07:35:36 - 07:49:12 4320
Okanogan 07:42:24 -55.1 Dark Down 57.3 197.7 Up 07:35:36 - 07:49:12 4258
Brewster 07:42:26 -55.3 Dark Down 57.6 197.5 Up 07:35:38 - 07:49:14 4230
Victoria 07:42:35 -54.2 Dark Down 57.8 191.0 Up 07:35:47 - 07:49:23 4221
Manson/Chelan 07:42:26 -55.4 Dark Down 57.9 196.9 Up 07:35:38 - 07:49:14 4206
Wenatchee 07:42:25 -55.9 Dark Down 58.4 196.8 Up 07:35:37 - 07:49:13 4160
Ellensburg 07:42:26 -56.2 Dark Down 58.8 196.6 Up 07:35:38 - 07:49:14 4118
Yakima 07:42:26 -56.6 Dark Down 59.2 196.8 Up 07:35:38 - 07:49:14 4080
Toppenish/White Swan 07:42:24 -56.9 Dark Down 59.4 197.2 Up 07:35:36 - 07:49:12 4062
PNWRO 07:42:20 -57.5 Dark Down 59.4 200.1 Up 07:35:32 - 07:49:08 4050
The Dalles 07:42:26 -57.5 Dark Down 60.3 196.1 Up 07:35:38 - 07:49:14 3978
Maupin 07:42:25 -57.9 Dark Down 60.7 196.5 Up 07:35:37 - 07:49:13 3940
Sisters 07:42:26 -58.6 Dark Down 61.6 196.0 Up 07:35:38 - 07:49:14 3849
Bend 07:42:25 -58.9 Dark Down 61.8 196.7 Up 07:35:37 - 07:49:13 3830
Oregon Observatory 07:42:26 -59.0 Dark Down 62.0 196.5 Up 07:35:38 - 07:49:14 3812
Dunrhomin 07:41:30 -63.1 Dark Down 58.6 228.5 Up 07:34:42 - 07:48:18 3751
Nikitin 07:41:30 -63.3 Dark Down 58.7 228.7 Up 07:34:42 - 07:48:18 3733
CU-SBO 07:41:30 -63.4 Dark Down 58.8 228.6 Up 07:34:42 - 07:48:18 3725
Chiloquin 07:42:26 -60.2 Dark Down 63.3 196.4 Up 07:35:38 - 07:49:14 3678
Klamath Falls 07:42:25 -60.5 Dark Down 63.7 196.7 Up 07:35:37 - 07:49:13 3646
Cedarville 07:42:19 -61.6 Dark Down 63.9 200.5 Up 07:35:31 - 07:49:07 3602
Fall River/Burney 07:42:22 -61.7 Dark Down 64.7 198.3 Up 07:35:34 - 07:49:10 3536
Gimple 07:42:20 -62.7 Dark Down 65.4 200.0 Up 07:35:32 - 07:49:08 3454
Greenville 07:42:21 -62.7 Dark Down 65.4 199.9 Up 07:35:33 - 07:49:09 3453
Quincy 07:42:20 -62.9 Dark Down 65.6 200.0 Up 07:35:32 - 07:49:08 3433
Portola 07:42:18 -63.1 Dark Down 65.6 201.2 Up 07:35:30 - 07:49:06 3428
Reno 07:42:16 -63.5 Dark Down 65.7 202.8 Up 07:35:28 - 07:49:04 3412
Carson City 07:42:15 -63.9 Dark Down 66.0 203.2 Up 07:35:27 - 07:49:03 3377
Yerington 07:42:14 -64.2 Dark Down 66.0 204.7 Up 07:35:26 - 07:49:02 3367
Gardnerville 07:42:15 -64.1 Dark Down 66.2 203.5 Up 07:35:27 - 07:49:03 3353
Hawthorne 07:42:11 -64.8 Dark Down 66.2 206.3 Up 07:35:23 - 07:48:59 3330
Lee Vining 07:42:12 -65.2 Dark Down 66.9 205.8 Up 07:35:24 - 07:49:00 3265
Bishop 07:42:09 -65.9 Dark Down 67.2 208.1 Up 07:35:21 - 07:48:57 3217
Beatty 07:42:07 -66.7 Dark Down 66.9 212.3 Up 07:35:19 - 07:48:55 3200
Patrick 07:41:51 -68.5 Dark Down 66.8 220.3 Up 07:35:03 - 07:48:39 3102
Laughlin/Bullhead City 07:41:53 -68.7 Dark Down 67.3 219.2 Up 07:35:05 - 07:48:41 3063
Lake Havasu City 07:41:51 -69.4 Dark Down 67.7 220.8 Up 07:35:03 - 07:48:39 3000
George/Scottsdale 07:41:42 -70.3 Dark Down 66.9 226.9 Up 07:34:54 - 07:48:30 2969
Idyllwild 07:42:07 -69.8 Dark Down 69.5 216.9 Up 07:35:19 - 07:48:55 2884
Wildwood 07:42:07 -69.0 Dark Down 70.1 211.7 Up 07:35:19 - 07:48:55 2880
Calipatria 07:41:54 -70.6 Dark Down 69.4 220.5 Up 07:35:06 - 07:48:42 2837
Yuma 07:41:51 -71.1 Dark Down 69.2 223.2 Up 07:35:03 - 07:48:39 2810

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 523680, (2026/02/11 07:41UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 15.33 139
25 Cnc         08:25:49.6 +17:02:43  6.2  1.09 127
PPM 125386     08:32:19.3 +16:12:46  8.4  0.72 125
PPM 125337     08:30:15.4 +16:39:48 10.0  0.05 126
523680         08:30:11.0 +16:42:51 12.6       126
Positions are for J2000

Event circumstances last updated at 2024/03/04 05:39:57 UT

Marc W. Buie, Southwest Research Institute

RECON