RECON: TNO occultation with 523686

Event between (523686) 14DB143 and star GA0880:13899159 with event index number of 2623112

Geocentric closest approach at 2026/05/31 10:22:43 UTC

J2000 position of star is 19:09:36.1 -00:29:34
Equinox of date position of star is 19:10:51.6 -00:27:06
Stellar brightness G=16.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 46 degrees from the moon. Moon is 100% illuminated.
Apparent brightness V=22.3

[RECON map]
Object is 20.4 AU from the Sun and 19.6 AU from the Earth.
Apparent velocity is 17.7 km/sec on the sky relative to the star, or, 4.5 arcsec/hr.
The 1-sigma error in the time of the event is 213 seconds.
The 1-sigma cross-track error in the shadow position is 1845 km.
The sky-plane scale is 14249.6 km/arcsec.

The object has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 5.1 sec chord
Diameter=37.2 km assuming a 30% albedo -- 2.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523686, (2026/05/31 10:23UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:01.9 -26:29:18  0.9 46.43   1
Tarazed        19:47:30.9 +10:40:46  2.7 14.37  60
PPM 180573     19:11:13.1 -00:23:01  6.5  0.09  46
523686         19:10:57.6 -00:26:55 16.1        46
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 4.2 sigma about the mid-time.
The median site spacing is 19.0 km RECON observability=0.6 and success probability=14.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 10:23:24 -3.9 CT Down 36.5 194.3 Up 10:08:24 - 10:38:24 1796
Kamloops 10:24:15 -10.6 NT Up 38.8 176.4 Up 10:09:15 - 10:39:15 1418
Kelowna 10:24:11 -11.0 NT Up 39.6 177.6 Up 10:09:11 - 10:39:11 1380
Peachland 10:24:12 -11.2 NT Up 39.7 177.2 Up 10:09:12 - 10:39:12 1367
Summerland 10:24:11 -11.3 NT Up 39.9 177.3 Up 10:09:11 - 10:39:11 1358
Penticton 10:24:11 -11.3 NT Up 39.9 177.4 Up 10:09:11 - 10:39:11 1356
Oliver 10:24:11 -11.6 NT Up 40.3 177.4 Up 10:09:11 - 10:39:11 1331
Anarchist Mountain Observatory 10:24:09 -11.7 NT Up 40.5 177.6 Up 10:09:09 - 10:39:09 1324
Okanogan 10:24:10 -12.3 AT Up 41.1 177.3 Up 10:09:10 - 10:39:10 1273
Brewster 10:24:10 -12.6 AT Up 41.4 177.1 Up 10:09:10 - 10:39:10 1249
Manson/Chelan 10:24:12 -12.9 AT Up 41.6 176.6 Up 10:09:12 - 10:39:12 1227
Victoria 10:24:25 -13.5 AT Up 40.7 172.4 Up 10:09:25 - 10:39:25 1203
Wenatchee 10:24:12 -13.3 AT Up 42.0 176.3 Up 10:09:12 - 10:39:12 1189
Ellensburg 10:24:12 -13.8 AT Up 42.4 176.0 Up 10:09:12 - 10:39:12 1154
Yakima 10:24:12 -14.1 AT Up 42.8 175.9 Up 10:09:12 - 10:39:12 1123
PNWRO 10:24:04 -13.9 AT Up 43.5 178.2 Up 10:09:04 - 10:39:04 1117
Toppenish/White Swan 10:24:11 -14.2 AT Up 43.1 176.1 Up 10:09:11 - 10:39:11 1111
The Dalles 10:24:14 -15.2 AT Up 43.8 175.0 Up 10:09:14 - 10:39:14 1035
Maupin 10:24:13 -15.5 AT Up 44.2 175.1 Up 10:09:13 - 10:39:13 1006
Dunrhomin 10:22:56 -11.7 NT Up 47.8 198.2 Up 10:07:56 - 10:37:56 1003
Nikitin 10:22:56 -11.8 NT Up 48.0 198.2 Up 10:07:56 - 10:37:56 988
CU-SBO 10:22:56 -11.9 NT Up 48.0 198.1 Up 10:07:56 - 10:37:56 981
Sisters 10:24:14 -16.4 AT Up 45.1 174.4 Up 10:09:14 - 10:39:14 928
Bend 10:24:13 -16.5 AT Up 45.3 174.7 Up 10:09:13 - 10:39:13 915
Oregon Observatory 10:24:13 -16.7 AT Up 45.5 174.5 Up 10:09:13 - 10:39:13 899
Chiloquin 10:24:14 -18.0 AT Up 46.8 173.8 Up 10:09:14 - 10:39:14 786
Klamath Falls 10:24:13 -18.2 Dark Up 47.1 173.8 Up 10:09:13 - 10:39:13 760
Cedarville 10:24:05 -18.1 Dark Up 47.9 176.1 Up 10:09:05 - 10:39:05 743
Fall River/Burney 10:24:10 -19.0 Dark Up 48.3 174.2 Up 10:09:10 - 10:39:10 674
Gimple 10:24:06 -19.5 Dark Up 49.3 174.9 Up 10:09:06 - 10:39:06 613
Greenville 10:24:07 -19.6 Dark Up 49.3 174.8 Up 10:09:07 - 10:39:07 611
Portola 10:24:04 -19.6 Dark Up 49.6 175.5 Up 10:09:04 - 10:39:04 596
Quincy 10:24:07 -19.7 Dark Up 49.5 174.8 Up 10:09:07 - 10:39:07 594
Reno 10:24:01 -19.6 Dark Up 49.9 176.5 Up 10:09:01 - 10:39:01 590
Carson City 10:24:01 -19.9 Dark Up 50.3 176.5 Up 10:09:01 - 10:39:01 561
Yerington 10:23:57 -19.7 Dark Up 50.5 177.4 Up 10:08:57 - 10:38:57 560
Gardnerville 10:24:00 -20.0 Dark Up 50.5 176.5 Up 10:09:00 - 10:39:00 542
Hawthorne 10:23:51 -19.9 Dark Up 51.0 178.2 Up 10:08:51 - 10:38:51 538
Lee Vining 10:23:51 -20.5 Dark Up 51.5 177.4 Up 10:08:51 - 10:38:51 484
Beatty 10:23:43 -20.2 Dark Up 52.6 181.2 Up 10:08:43 - 10:38:43 446
Bishop 10:23:51 -20.7 Dark Up 52.1 178.5 Up 10:08:51 - 10:38:51 444
Patrick 10:23:28 -19.9 Dark Up 53.9 186.0 Up 10:08:28 - 10:38:28 394
Laughlin/Bullhead City 10:23:30 -20.4 Dark Up 54.2 184.9 Up 10:08:30 - 10:38:30 354
Lake Havasu City 10:23:28 -20.8 Dark Up 54.9 185.4 Up 10:08:28 - 10:38:28 303
George/Scottsdale 10:23:15 -20.0 Dark Up 55.4 189.7 Up 10:08:15 - 10:38:15 301
Idyllwild 10:23:39 -22.7 Dark Up 55.8 181.3 Up 10:08:39 - 10:38:39 175
Wildwood 10:23:48 -23.3 Dark Up 55.4 178.0 Up 10:08:48 - 10:38:48 156
Calipatria 10:23:32 -22.5 Dark Up 56.3 183.4 Up 10:08:32 - 10:38:32 152
Yuma 10:23:27 -22.3 Dark Up 56.7 185.0 Up 10:08:27 - 10:38:27 138

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, (2026/05/31 10:23UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 46.43   1
Tarazed        19:46:15.6 +10:36:48  2.7 14.37  60
PPM 180573     19:09:51.6 -00:25:41  6.5  0.09  46
523686         19:09:36.1 -00:29:34 16.1        46
Positions are for J2000

Event circumstances last updated at 2024/06/19 21:25:25 UT

Marc W. Buie, Southwest Research Institute

RECON