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 07:42:07 UTC

J2000 position of star is 08:30:11.0 +16:42:51
Equinox of date position of star is 08:31:26.6 +16:38:18
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.
TNO apparent brightness V=22.1

[RECON map]
TNO is 44.4 AU from the Sun and 43.4 AU from the Earth.
The TNO is moving 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 99 seconds.
The 1-sigma cross-track error in the shadow position is 2570 km.
The sky-plane scale is 31482.9 km/arcsec.

The TNO has an absolute magnitude Hv=5.6
Diameter=448.8 km assuming a 5% albedo -- 18.4 sec chord
Diameter=183.2 km assuming a 30% albedo -- 7.5 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 27.3 km RECON observability=1.0 and success probability=17.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 07:41:25 -51.6 Dark Down 50.1 216.2 Up 07:32:41 - 07:50:09 3480
Kamloops 07:42:07 -52.7 Dark Down 55.3 195.3 Up 07:33:23 - 07:50:51 3147
Kelowna 07:41:58 -53.6 Dark Down 55.9 197.0 Up 07:33:14 - 07:50:42 3083
Peachland 07:41:58 -53.7 Dark Down 56.1 196.6 Up 07:33:14 - 07:50:42 3069
Summerland 07:41:58 -53.8 Dark Down 56.2 196.8 Up 07:33:14 - 07:50:42 3057
Penticton 07:41:58 -53.9 Dark Down 56.2 197.0 Up 07:33:14 - 07:50:42 3052
Oliver 07:41:57 -54.3 Dark Down 56.6 197.2 Up 07:33:13 - 07:50:41 3020
Anarchist Mountain Observatory 07:41:57 -54.4 Dark Down 56.7 197.6 Up 07:33:13 - 07:50:41 3008
Tonasket 07:41:57 -54.7 Dark Down 57.0 197.6 Up 07:33:13 - 07:50:41 2979
Okanogan 07:41:57 -55.0 Dark Down 57.4 197.5 Up 07:33:13 - 07:50:41 2946
Brewster 07:41:57 -55.3 Dark Down 57.7 197.3 Up 07:33:13 - 07:50:41 2918
Victoria 07:42:08 -54.2 Dark Down 57.8 190.8 Up 07:33:24 - 07:50:52 2910
Manson/Chelan 07:41:58 -55.4 Dark Down 57.9 196.7 Up 07:33:14 - 07:50:42 2894
Wenatchee 07:41:58 -55.9 Dark Down 58.4 196.6 Up 07:33:14 - 07:50:42 2848
Ellensburg 07:41:58 -56.2 Dark Down 58.9 196.4 Up 07:33:14 - 07:50:42 2807
Yakima 07:41:57 -56.6 Dark Down 59.3 196.6 Up 07:33:13 - 07:50:41 2768
Toppenish/White Swan 07:41:57 -56.8 Dark Down 59.4 197.0 Up 07:33:13 - 07:50:41 2750
PNWRO 07:41:52 -57.4 Dark Down 59.5 199.9 Up 07:33:08 - 07:50:36 2738
Goldendale 07:41:58 -57.3 Dark Down 60.0 196.5 Up 07:33:14 - 07:50:42 2693
The Dalles 07:41:59 -57.4 Dark Down 60.3 195.9 Up 07:33:15 - 07:50:43 2666
Maupin 07:41:57 -57.9 Dark Down 60.7 196.3 Up 07:33:13 - 07:50:41 2628
Sisters 07:41:58 -58.6 Dark Down 61.7 195.8 Up 07:33:14 - 07:50:42 2537
Bend 07:41:57 -58.9 Dark Down 61.8 196.4 Up 07:33:13 - 07:50:41 2518
Oregon Observatory 07:41:57 -59.0 Dark Down 62.0 196.3 Up 07:33:13 - 07:50:41 2500
North Lake 07:41:55 -59.7 Dark Down 62.5 197.7 Up 07:33:11 - 07:50:39 2446
Dunrhomin 07:41:02 -63.1 Dark Down 58.6 228.3 Up 07:32:18 - 07:49:46 2438
CU-SBO 07:41:02 -63.4 Dark Down 58.9 228.5 Up 07:32:18 - 07:49:46 2412
Chiloquin 07:41:58 -60.2 Dark Down 63.4 196.1 Up 07:33:14 - 07:50:42 2366
Lakeview 07:41:53 -60.9 Dark Down 63.4 199.5 Up 07:33:09 - 07:50:37 2352
Klamath Falls 07:41:57 -60.5 Dark Down 63.7 196.5 Up 07:33:13 - 07:50:41 2334
Cedarville 07:41:52 -61.5 Dark Down 64.0 200.3 Up 07:33:08 - 07:50:36 2290
Fall River/Burney 07:41:55 -61.7 Dark Down 64.7 198.0 Up 07:33:11 - 07:50:39 2224
Susanville 07:41:52 -62.5 Dark Down 65.1 200.0 Up 07:33:08 - 07:50:36 2173
Gimple 07:41:52 -62.7 Dark Down 65.5 199.8 Up 07:33:08 - 07:50:36 2142
Greenville 07:41:53 -62.7 Dark Down 65.5 199.6 Up 07:33:09 - 07:50:37 2141
Quincy 07:41:52 -62.9 Dark Down 65.7 199.8 Up 07:33:08 - 07:50:36 2121
Portola 07:41:50 -63.1 Dark Down 65.7 200.9 Up 07:33:06 - 07:50:34 2116
Reno 07:41:48 -63.5 Dark Down 65.7 202.5 Up 07:33:04 - 07:50:32 2100
Carson City 07:41:48 -63.9 Dark Down 66.0 202.9 Up 07:33:04 - 07:50:32 2064
Yerington 07:41:45 -64.2 Dark Down 66.0 204.5 Up 07:33:01 - 07:50:29 2055
Gardnerville 07:41:47 -64.1 Dark Down 66.3 203.2 Up 07:33:03 - 07:50:31 2041
Hawthorne 07:41:43 -64.7 Dark Down 66.3 206.1 Up 07:32:59 - 07:50:27 2018
Tonopah 07:41:38 -65.5 Dark Down 66.2 209.6 Up 07:32:54 - 07:50:22 1995
Lee Vining 07:41:44 -65.2 Dark Down 67.0 205.6 Up 07:33:00 - 07:50:28 1953
Bishop 07:41:41 -65.9 Dark Down 67.2 207.8 Up 07:32:57 - 07:50:25 1905
Beatty 07:41:35 -66.7 Dark Down 67.0 212.0 Up 07:32:51 - 07:50:19 1887
Indian Springs 07:41:31 -67.2 Dark Down 66.8 214.7 Up 07:32:47 - 07:50:15 1873
Henderson 07:41:28 -67.8 Dark Down 66.9 216.9 Up 07:32:44 - 07:50:12 1832
Patrick 07:41:24 -68.5 Dark Down 66.8 220.1 Up 07:32:40 - 07:50:08 1789
Kingman/Dolan Springs 07:41:24 -68.7 Dark Down 67.1 220.0 Up 07:32:40 - 07:50:08 1763
Laughlin/Bullhead City 07:41:26 -68.7 Dark Down 67.4 219.0 Up 07:32:42 - 07:50:10 1751
Mohave Valley 07:41:25 -68.9 Dark Down 67.6 219.4 Up 07:32:41 - 07:50:09 1723
Lake Havasu City 07:41:24 -69.4 Dark Down 67.8 220.6 Up 07:32:40 - 07:50:08 1687
George/Scottsdale 07:41:14 -70.3 Dark Down 67.0 226.7 Up 07:32:30 - 07:49:58 1657
Parker 07:41:23 -69.7 Dark Down 68.0 221.2 Up 07:32:39 - 07:50:07 1652
Wildwood 07:41:38 -69.0 Dark Down 70.2 211.4 Up 07:32:54 - 07:50:22 1568
Idyllwild 07:41:31 -69.8 Dark Down 69.6 216.5 Up 07:32:47 - 07:50:15 1565
Calipatria 07:41:26 -70.6 Dark Down 69.5 220.2 Up 07:32:42 - 07:50:10 1524
Yuma 07:41:23 -71.1 Dark Down 69.3 222.9 Up 07:32:39 - 07:50:07 1497

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 2022/04/13 23:10:39 UT

Marc W. Buie, Southwest Research Institute

RECON