RECON: TNO occultation with 523686

Event between (523686) 14DB143 and star GA0880:12357504 with event index number of 2623275

Geocentric closest approach at 2026/07/21 07:51:33 UTC

J2000 position of star is 19:02:16.5 -00:27:33
Equinox of date position of star is 19:03:31.9 -00:25:20
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 82 degrees from the moon. Moon is 49% illuminated.
Apparent brightness V=22.2

[RECON map]
Object is 20.4 AU from the Sun and 19.5 AU from the Earth.
Apparent velocity is 22.3 km/sec on the sky relative to the star, or, 5.7 arcsec/hr.
The 1-sigma error in the time of the event is 170 seconds.
The 1-sigma cross-track error in the shadow position is 1202 km.
The sky-plane scale is 14127.5 km/arcsec.

The object has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 4.0 sec chord
Diameter=37.2 km assuming a 30% albedo -- 1.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523686, (2026/07/21 07:52UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:02.4 -26:29:19  0.9 45.00  43
Tarazed        19:47:31.3 +10:40:47  2.7 15.56  96
PPM 180541     19:06:41.1 -01:28:12  6.4  1.30  83
PPM 180521     19:02:07.4 -00:24:57  8.0  0.38  82
PPM 180527     19:04:06.4 -00:40:17  8.9  0.28  82
523686         19:03:38.4 -00:25:09 16.6        83
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 23.0 km RECON observability=1.0 and success probability=3.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 07:50:17 -18.8 Dark Down 38.1 193.7 Up 07:35:38 - 08:04:57 4142
Kelowna 07:50:14 -19.6 Dark Down 38.7 195.0 Up 07:35:34 - 08:04:53 4071
Peachland 07:50:15 -19.7 Dark Down 38.9 194.6 Up 07:35:35 - 08:04:54 4067
Sleaford 07:49:35 -17.0 AT Down 33.4 210.4 Up 07:34:56 - 08:04:15 4056
Summerland 07:50:15 -19.9 Dark Down 39.0 194.8 Up 07:35:35 - 08:04:54 4054
Penticton 07:50:14 -20.0 Dark Down 39.0 194.9 Up 07:35:35 - 08:04:54 4048
Victoria 07:50:26 -20.7 Dark Down 40.6 190.2 Up 07:35:47 - 08:05:06 4028
Oliver 07:50:14 -20.3 Dark Down 39.4 195.0 Up 07:35:35 - 08:04:54 4022
Anarchist Mountain Observatory 07:50:13 -20.5 Dark Down 39.5 195.3 Up 07:35:34 - 08:04:53 4007
Okanogan 07:50:14 -21.1 Dark Down 40.2 195.1 Up 07:35:35 - 08:04:54 3962
Brewster 07:50:14 -21.4 Dark Down 40.5 194.9 Up 07:35:35 - 08:04:54 3944
Manson/Chelan 07:50:16 -21.6 Dark Down 40.7 194.5 Up 07:35:37 - 08:04:56 3934
Wenatchee 07:50:16 -22.0 Dark Down 41.2 194.4 Up 07:35:37 - 08:04:56 3900
Ellensburg 07:50:17 -22.4 Dark Down 41.7 194.2 Up 07:35:38 - 08:04:57 3872
Yakima 07:50:17 -22.8 Dark Down 42.1 194.3 Up 07:35:38 - 08:04:57 3841
Toppenish/White Swan 07:50:17 -23.1 Dark Down 42.2 194.5 Up 07:35:37 - 08:04:56 3821
The Dalles 07:50:20 -23.8 Dark Down 43.1 193.7 Up 07:35:40 - 08:04:59 3773
PNWRO 07:50:12 -23.5 Dark Down 42.3 196.6 Up 07:35:33 - 08:04:52 3771
Maupin 07:50:19 -24.2 Dark Down 43.5 193.9 Up 07:35:40 - 08:04:59 3738
Sisters 07:50:21 -25.1 Dark Down 44.4 193.4 Up 07:35:41 - 08:05:00 3676
Bend 07:50:20 -25.3 Dark Down 44.6 193.8 Up 07:35:41 - 08:05:00 3653
Oregon Observatory 07:50:20 -25.5 Dark Down 44.8 193.7 Up 07:35:41 - 08:05:00 3642
Chiloquin 07:50:22 -26.8 Dark Down 46.2 193.4 Up 07:35:43 - 08:05:02 3541
Klamath Falls 07:50:22 -27.1 Dark Down 46.5 193.6 Up 07:35:42 - 08:05:01 3512
Cedarville 07:50:16 -27.9 Dark Down 46.9 196.1 Up 07:35:37 - 08:04:56 3428
Fall River/Burney 07:50:21 -28.3 Dark Down 47.6 194.5 Up 07:35:41 - 08:05:00 3407
Greenville 07:50:19 -29.2 Dark Down 48.4 195.4 Up 07:35:40 - 08:04:59 3323
Gimple 07:50:19 -29.2 Dark Down 48.3 195.5 Up 07:35:39 - 08:04:58 3322
Quincy 07:50:20 -29.4 Dark Down 48.6 195.5 Up 07:35:40 - 08:04:59 3306
Portola 07:50:18 -29.6 Dark Down 48.6 196.2 Up 07:35:38 - 08:04:57 3288
Reno 07:50:16 -29.9 Dark Down 48.7 197.2 Up 07:35:36 - 08:04:55 3254
Carson City 07:50:16 -30.3 Dark Down 49.0 197.4 Up 07:35:36 - 08:04:55 3223
Gardnerville 07:50:15 -30.5 Dark Down 49.2 197.5 Up 07:35:36 - 08:04:55 3201
Yerington 07:50:13 -30.5 Dark Down 49.1 198.4 Up 07:35:34 - 08:04:53 3195
Hawthorne 07:50:11 -31.0 Dark Down 49.4 199.3 Up 07:35:31 - 08:04:50 3146
Lee Vining 07:50:13 -31.5 Dark Down 50.0 198.8 Up 07:35:33 - 08:04:52 3105
Dunrhomin 07:49:24 -28.5 Dark Down 43.0 216.4 Up 07:34:45 - 08:04:04 3083
Nikitin 07:49:24 -28.7 Dark Down 43.2 216.5 Up 07:34:44 - 08:04:03 3067
CU-SBO 07:49:24 -28.8 Dark Down 43.3 216.4 Up 07:34:45 - 08:04:04 3062
Bishop 07:50:10 -32.1 Dark Down 50.4 200.1 Up 07:35:31 - 08:04:50 3039
Beatty 07:50:04 -32.7 Dark Down 50.4 202.8 Up 07:35:24 - 08:04:43 2970
Patrick 07:49:54 -34.1 Dark Down 50.7 207.7 Up 07:35:14 - 08:04:33 2786
Laughlin/Bullhead City 07:49:56 -34.4 Dark Down 51.2 206.9 Up 07:35:17 - 08:04:36 2775
Wildwood 07:50:12 -35.4 Dark Down 53.5 201.3 Up 07:35:32 - 08:04:51 2746
Lake Havasu City 07:49:55 -35.0 Dark Down 51.7 207.6 Up 07:35:16 - 08:04:35 2708
Idyllwild 07:50:05 -35.8 Dark Down 53.2 204.4 Up 07:35:25 - 08:04:44 2680
Calipatria 07:50:00 -36.4 Dark Down 53.4 206.6 Up 07:35:20 - 08:04:39 2602
George/Scottsdale 07:49:46 -35.7 Dark Down 51.4 211.7 Up 07:35:06 - 08:04:25 2593
Yuma 07:49:57 -36.9 Dark Down 53.4 208.3 Up 07:35:17 - 08:04:36 2545

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 523686, (2026/07/21 07:52UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 45.00  43
Tarazed        19:46:15.6 +10:36:48  2.7 15.56  96
PPM 180541     19:05:18.6 -01:30:43  6.4  1.30  83
PPM 180521     19:00:45.5 -00:27:18  8.0  0.38  82
PPM 180527     19:02:44.4 -00:42:43  8.9  0.28  82
523686         19:02:16.5 -00:27:33 16.6        82
Positions are for J2000

Event circumstances last updated at 2024/06/19 21:31:59 UT

Marc W. Buie, Southwest Research Institute

RECON