RECON: TNO occultation with 523686

Event between (523686) 14DB143 and star GA0880:13176836 with event index number of 2623189

Geocentric closest approach at 2026/06/28 06:06:45 UTC

J2000 position of star is 19:05:48.2 -00:22:15
Equinox of date position of star is 19:07:03.6 -00:19:55
Stellar brightness G=16.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 40 degrees from the moon. Moon is 97% 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 177 seconds.
The 1-sigma cross-track error in the shadow position is 1023 km.
The sky-plane scale is 14121.9 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, (2026/06/28 06:07UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:02.2 -26:29:18  0.9 45.75   8
Tarazed        19:47:31.1 +10:40:46  2.7 14.89  55
PPM 180573     19:11:13.3 -00:23:00  6.5  1.02  41
PPM 180540     19:06:37.6 -00:53:37  6.9  0.58  40
PPM 180543     19:06:54.3 -00:26:56  9.7  0.14  40
523686         19:07:09.9 -00:19:43 16.8        40
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 5.1 sigma about the mid-time.
The median site spacing is 31.4 km RECON observability=0.7 and success probability=0.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 06:07:54 -13.5 AT Up 33.8 150.7 Up 05:52:54 - 06:22:54 6479
Kamloops 06:08:37 -11.7 NT Up 29.5 134.6 Low 05:53:37 - 06:23:37 6384
Kelowna 06:08:37 -12.7 AT Up 30.5 135.2 Up 05:53:37 - 06:23:37 6327
Peachland 06:08:38 -12.7 AT Up 30.4 134.8 Up 05:53:38 - 06:23:38 6319
Summerland 06:08:38 -12.9 AT Up 30.6 134.9 Up 05:53:38 - 06:23:38 6308
Penticton 06:08:38 -13.0 AT Up 30.7 135.0 Up 05:53:38 - 06:23:38 6303
Oliver 06:08:39 -13.3 AT Up 30.9 134.8 Up 05:53:39 - 06:23:39 6278
Anarchist Mountain Observatory 06:08:39 -13.5 AT Up 31.1 134.9 Up 05:53:39 - 06:23:39 6266
Victoria 06:08:50 -12.7 AT Up 29.5 130.7 Low 05:53:50 - 06:23:50 6230
Okanogan 06:08:41 -14.0 AT Up 31.5 134.4 Up 05:53:41 - 06:23:41 6219
Brewster 06:08:42 -14.2 AT Up 31.6 134.1 Up 05:53:42 - 06:23:42 6199
Manson/Chelan 06:08:43 -14.3 AT Up 31.5 133.7 Up 05:53:43 - 06:23:43 6184
Wenatchee 06:08:45 -14.7 AT Up 31.8 133.3 Up 05:53:45 - 06:23:45 6148
Ellensburg 06:08:46 -15.0 AT Up 32.0 132.9 Up 05:53:46 - 06:23:46 6118
Yakima 06:08:47 -15.3 AT Up 32.2 132.7 Up 05:53:47 - 06:23:47 6087
Toppenish/White Swan 06:08:47 -15.6 AT Up 32.5 132.7 Up 05:53:47 - 06:23:47 6070
PNWRO 06:08:44 -16.4 AT Up 33.5 134.1 Up 05:53:44 - 06:23:44 6042
The Dalles 06:08:51 -16.0 AT Up 32.6 131.6 Up 05:53:51 - 06:23:51 6011
Maupin 06:08:52 -16.4 AT Up 32.9 131.5 Up 05:53:52 - 06:23:52 5979
Sisters 06:08:55 -17.0 AT Up 33.2 130.6 Up 05:53:55 - 06:23:55 5910
Bend 06:08:55 -17.3 AT Up 33.5 130.7 Up 05:53:55 - 06:23:55 5891
Oregon Observatory 06:08:56 -17.4 AT Up 33.6 130.5 Up 05:53:56 - 06:23:56 5878
Chiloquin 06:09:00 -18.4 Dark Up 34.2 129.4 Up 05:54:00 - 06:24:00 5772
Klamath Falls 06:09:00 -18.8 Dark Up 34.5 129.3 Up 05:54:00 - 06:24:00 5744
Cedarville 06:08:57 -19.9 Dark Up 35.8 130.6 Up 05:53:57 - 06:23:57 5687
Fall River/Burney 06:09:02 -19.9 Dark Up 35.4 129.1 Up 05:54:02 - 06:24:02 5647
Dunrhomin 06:08:12 -25.2 Dark Up 44.2 146.7 Up 05:53:12 - 06:23:12 5577
Greenville 06:09:02 -20.9 Dark Up 36.3 129.0 Up 05:54:02 - 06:24:02 5571
Gimple 06:09:02 -20.9 Dark Up 36.3 129.1 Up 05:54:02 - 06:24:02 5571
Nikitin 06:08:12 -25.3 Dark Up 44.4 146.5 Up 05:53:12 - 06:23:12 5562
CU-SBO 06:08:12 -25.4 Dark Up 44.4 146.4 Up 05:53:12 - 06:23:12 5557
Quincy 06:09:03 -21.1 Dark Up 36.4 128.9 Up 05:54:03 - 06:24:03 5554
Portola 06:09:02 -21.3 Dark Up 36.8 129.3 Up 05:54:02 - 06:24:02 5543
Reno 06:09:00 -21.8 Dark Up 37.3 129.8 Up 05:54:00 - 06:24:00 5521
Carson City 06:09:01 -22.1 Dark Up 37.6 129.6 Up 05:54:01 - 06:24:01 5490
Yerington 06:08:59 -22.5 Dark Up 38.1 130.1 Up 05:53:59 - 06:23:59 5473
Gardnerville 06:09:01 -22.4 Dark Up 37.8 129.5 Up 05:54:01 - 06:24:01 5469
Hawthorne 06:08:58 -23.1 Dark Up 38.7 130.4 Up 05:53:58 - 06:23:58 5433
Lee Vining 06:09:01 -23.5 Dark Up 38.8 129.6 Up 05:54:01 - 06:24:01 5385
Bishop 06:09:00 -24.3 Dark Up 39.6 129.9 Up 05:54:00 - 06:24:00 5332
Beatty 06:08:55 -25.3 Dark Up 40.9 131.3 Up 05:53:55 - 06:23:55 5291
Patrick 06:08:48 -27.6 Dark Up 43.6 133.4 Up 05:53:48 - 06:23:48 5158
Laughlin/Bullhead City 06:08:51 -27.6 Dark Up 43.3 132.5 Up 05:53:51 - 06:23:51 5135
Lake Havasu City 06:08:51 -28.3 Dark Up 43.9 132.3 Up 05:53:51 - 06:23:51 5074
Wildwood 06:09:06 -27.1 Dark Up 41.5 127.6 Up 05:54:06 - 06:24:06 5039
Idyllwild 06:09:00 -28.1 Dark Up 42.9 129.2 Up 05:54:00 - 06:24:00 5006
George/Scottsdale 06:08:44 -29.8 Dark Up 45.9 134.5 Up 05:53:44 - 06:23:44 5003
Calipatria 06:08:57 -29.1 Dark Up 44.1 130.0 Up 05:53:57 - 06:23:57 4949
Yuma 06:08:55 -29.8 Dark Up 44.9 130.6 Up 05:53:55 - 06:23:55 4909

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, (2026/06/28 06:07UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 45.75   8
Tarazed        19:46:15.6 +10:36:48  2.7 14.89  55
PPM 180573     19:09:51.6 -00:25:41  6.5  1.02  41
PPM 180540     19:05:15.6 -00:56:08  6.9  0.58  40
PPM 180543     19:05:32.6 -00:29:28  9.7  0.14  40
523686         19:05:48.2 -00:22:15 16.8        40
Positions are for J2000

Event circumstances last updated at 2024/06/19 21:29:48 UT

Marc W. Buie, Southwest Research Institute

RECON