RECON: TNO occultation with 523770

Event between (523770) 14XO40 and star GA0800:04763082 with event index number of 2612307

Geocentric closest approach at 2026/05/07 09:44:06 UTC

J2000 position of star is 15:25:12.5 -08:29:30
Equinox of date position of star is 15:26:31.5 -08:34:35
Stellar brightness G=16.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 59 degrees from the moon. Moon is 73% illuminated.
Apparent brightness V=19.9

[RECON map]
Object is 16.2 AU from the Sun and 15.2 AU from the Earth.
Apparent velocity is 21.1 km/sec on the sky relative to the star, or, 6.9 arcsec/hr.
The 1-sigma error in the time of the event is 60 seconds.
The 1-sigma cross-track error in the shadow position is 827 km.
The sky-plane scale is 11024.7 km/arcsec.

The object has an absolute magnitude Hv=7.9
Diameter=153.5 km assuming a 5% albedo -- 7.3 sec chord
Diameter=62.7 km assuming a 30% albedo -- 3.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523770, (2026/05/07 09:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:01.6 -26:29:17  0.9 23.53  39
27Bet Lib      15:18:25.7 -09:28:42  2.6  2.21  61
31Eps Lib      15:25:37.8 -10:24:54  4.8  1.85  59
PPM 198621     15:29:03.6 -09:02:17  7.8  0.75  59
PPM 198569     15:26:23.9 -08:26:03  9.3  0.16  59
523770         15:26:37.6 -08:34:59 16.1        59
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 9.4 km RECON observability=1.0 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 09:44:31 -12.4 AT Up 22.7 217.0 Low 09:39:03 - 09:49:59 5790
Kamloops 09:45:04 -18.5 Dark Up 28.4 202.4 Low 09:39:36 - 09:50:32 5397
Kelowna 09:45:01 -18.9 Dark Up 28.9 203.6 Low 09:39:33 - 09:50:29 5390
Peachland 09:45:01 -19.1 Dark Up 29.1 203.3 Low 09:39:33 - 09:50:29 5377
Penticton 09:44:59 -19.3 Dark Up 29.2 203.5 Low 09:39:31 - 09:50:27 5374
Summerland 09:45:00 -19.2 Dark Up 29.2 203.4 Low 09:39:32 - 09:50:28 5374
Oliver 09:44:59 -19.6 Dark Up 29.6 203.6 Low 09:39:31 - 09:50:27 5360
Anarchist Mountain Observatory 09:44:57 -19.7 Dark Up 29.7 203.9 Low 09:39:29 - 09:50:25 5359
Dunrhomin 09:43:49 -21.0 Dark Up 31.7 221.5 Up 09:38:21 - 09:49:17 5352
Nikitin 09:43:48 -21.1 Dark Up 31.8 221.5 Up 09:38:20 - 09:49:16 5342
CU-SBO 09:43:50 -21.2 Dark Up 31.9 221.5 Up 09:38:22 - 09:49:18 5337
Okanogan 09:44:57 -20.3 Dark Up 30.3 203.8 Up 09:39:29 - 09:50:25 5326
Brewster 09:44:57 -20.6 Dark Up 30.6 203.6 Up 09:39:29 - 09:50:25 5309
Manson/Chelan 09:44:58 -20.9 Dark Up 30.9 203.3 Up 09:39:30 - 09:50:26 5289
Wenatchee 09:44:57 -21.4 Dark Up 31.4 203.2 Up 09:39:29 - 09:50:25 5264
PNWRO 09:44:48 -22.2 Dark Up 32.3 205.1 Up 09:39:20 - 09:50:16 5243
Ellensburg 09:44:55 -21.8 Dark Up 31.8 203.0 Up 09:39:27 - 09:50:23 5239
Victoria 09:45:09 -21.3 Dark Up 31.1 199.5 Up 09:39:41 - 09:50:37 5223
Yakima 09:44:55 -22.2 Dark Up 32.2 203.1 Up 09:39:27 - 09:50:23 5221
Toppenish/White Swan 09:44:54 -22.3 Dark Up 32.4 203.3 Up 09:39:26 - 09:50:22 5216
The Dalles 09:44:55 -23.3 Dark Up 33.3 202.6 Up 09:39:27 - 09:50:23 5156
Maupin 09:44:53 -23.6 Dark Up 33.6 202.9 Up 09:39:25 - 09:50:21 5139
Sisters 09:44:53 -24.5 Dark Up 34.6 202.5 Up 09:39:25 - 09:50:21 5082
Bend 09:44:52 -24.7 Dark Up 34.7 202.9 Up 09:39:24 - 09:50:20 5078
Oregon Observatory 09:44:51 -24.9 Dark Up 34.9 202.8 Up 09:39:23 - 09:50:19 5066
Chiloquin 09:44:49 -26.2 Dark Up 36.3 202.6 Up 09:39:21 - 09:50:17 4985
Cedarville 09:44:41 -26.5 Dark Up 36.7 204.9 Up 09:39:13 - 09:50:09 4985
Klamath Falls 09:44:49 -26.5 Dark Up 36.6 202.8 Up 09:39:21 - 09:50:17 4970
Fall River/Burney 09:44:44 -27.4 Dark Up 37.5 203.6 Up 09:39:16 - 09:50:12 4919
Reno 09:44:34 -28.1 Dark Up 38.4 205.9 Up 09:39:06 - 09:50:02 4888
Gimple 09:44:40 -28.0 Dark Up 38.2 204.5 Up 09:39:12 - 09:50:08 4887
Greenville 09:44:41 -28.0 Dark Up 38.2 204.4 Up 09:39:13 - 09:50:09 4884
Portola 09:44:38 -28.1 Dark Up 38.4 205.1 Up 09:39:10 - 09:50:06 4882
Yerington 09:44:32 -28.4 Dark Up 38.7 206.9 Up 09:39:04 - 09:50:00 4878
Quincy 09:44:40 -28.2 Dark Up 38.4 204.5 Up 09:39:12 - 09:50:08 4873
Hawthorne 09:44:28 -28.6 Dark Up 38.9 207.7 Up 09:39:00 - 09:49:56 4869
Carson City 09:44:34 -28.4 Dark Up 38.7 206.1 Up 09:39:06 - 09:50:02 4869
Gardnerville 09:44:33 -28.6 Dark Up 38.9 206.2 Up 09:39:05 - 09:50:01 4856
Patrick 09:44:03 -29.1 Dark Up 39.7 214.4 Up 09:38:35 - 09:49:31 4841
Beatty 09:44:17 -29.2 Dark Up 39.6 210.5 Up 09:38:49 - 09:49:45 4836
Lee Vining 09:44:29 -29.2 Dark Up 39.6 207.3 Up 09:39:01 - 09:49:57 4821
Bishop 09:44:24 -29.5 Dark Up 39.9 208.4 Up 09:38:56 - 09:49:52 4810
Laughlin/Bullhead City 09:44:05 -29.6 Dark Up 40.2 213.7 Up 09:38:37 - 09:49:33 4803
George/Scottsdale 09:43:50 -29.4 Dark Up 40.1 217.5 Up 09:38:22 - 09:49:18 4802
Lake Havasu City 09:44:01 -30.0 Dark Up 40.6 214.3 Up 09:38:33 - 09:49:29 4771
Yuma 09:43:58 -31.6 Dark Up 42.3 214.9 Up 09:38:30 - 09:49:26 4648
Calipatria 09:44:02 -31.7 Dark Up 42.3 213.6 Up 09:38:34 - 09:49:30 4646
Idyllwild 09:44:08 -31.8 Dark Up 42.3 211.9 Up 09:38:40 - 09:49:36 4646
Wildwood 09:44:17 -32.3 Dark Up 42.8 209.5 Up 09:38:49 - 09:49:45 4603

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 523770, (2026/05/07 09:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 23.53  39
27Bet Lib      15:17:00.3 -09:22:59  2.6  2.21  61
31Eps Lib      15:24:11.8 -10:19:23  4.8  1.85  59
PPM 198621     15:27:38.2 -08:56:53  7.8  0.75  59
PPM 198569     15:24:58.8 -08:20:33  9.3  0.16  59
523770         15:25:12.5 -08:29:30 16.1        59
Positions are for J2000

Event circumstances last updated at 2024/06/18 21:26:33 UT

Marc W. Buie, Southwest Research Institute

RECON