RECON: TNO occultation with 523655

Event between (523655) 11VJ24 and star GA1160:03081918 with event index number of 2572729

Geocentric closest approach at 2025/05/03 04:36:36 UTC

J2000 position of star is 08:44:55.5 +26:58:05
Equinox of date position of star is 08:46:22.3 +26:52:43
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 11 degrees from the moon. Moon is 36% illuminated.
Apparent brightness V=21.1

[RECON map]
Object is 32.0 AU from the Sun and 32.1 AU from the Earth.
Apparent velocity is 9.8 km/sec on the sky relative to the star, or, 1.5 arcsec/hr.
The 1-sigma error in the time of the event is 154 seconds.
The 1-sigma cross-track error in the shadow position is 1283 km.
The sky-plane scale is 23288.5 km/arcsec.

The object has an absolute magnitude Hv=5.8
Diameter=411.2 km assuming a 5% albedo -- 43.1 sec chord
Diameter=167.9 km assuming a 30% albedo -- 17.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 523655, (2025/05/03 04:37UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:51.9 +27:57:47  1.1 13.26   4
48Iot Cnc      08:48:13.5 +28:39:56  4.0  1.83  12
PPM 099024     08:47:45.4 +27:30:01  8.2  0.69  11
PPM 098996     08:45:26.2 +27:07:52  8.8  0.34  11
PPM 099016     08:47:17.8 +27:02:07 11.8  0.25  11
523655         08:46:26.3 +26:52:29 15.9        11
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 13.3 km RECON observability=0.6 and success probability=0.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 04:36:22 -15.3 AT Up 43.3 258.8 Up 04:23:01 - 04:49:43 -1824
Dunrhomin 04:38:36 -25.4 Dark Up 43.4 271.0 Up 04:25:15 - 04:51:57 -1974
Nikitin 04:38:38 -25.5 Dark Up 43.4 271.1 Up 04:25:17 - 04:51:59 -1979
CU-SBO 04:38:40 -25.5 Dark Up 43.5 271.2 Up 04:25:19 - 04:52:01 -1985
Kelowna 04:36:23 -11.2 NT Up 52.0 247.9 Up 04:23:02 - 04:49:44 -2551
Penticton 04:36:26 -11.4 NT Up 52.2 248.2 Up 04:23:05 - 04:49:47 -2565
Anarchist Mountain Observatory 04:36:33 -11.9 NT Up 52.3 249.1 Up 04:23:12 - 04:49:54 -2568
Summerland 04:36:25 -11.3 NT Up 52.3 248.0 Up 04:23:04 - 04:49:46 -2569
Peachland 04:36:23 -11.2 NT Up 52.3 247.7 Up 04:23:02 - 04:49:44 -2570
Oliver 04:36:30 -11.7 NT Up 52.3 248.6 Up 04:23:09 - 04:49:51 -2574
Kamloops 04:36:10 -10.2 NT Up 52.3 245.9 Up 04:22:49 - 04:49:31 -2579
George/Scottsdale 04:39:39 -26.9 Dark Up 48.3 274.1 Up 04:26:18 - 04:53:00 -2586
Okanogan 04:36:39 -12.2 AT Up 52.6 249.6 Up 04:23:18 - 04:50:00 -2598
Brewster 04:36:41 -12.3 AT Up 52.8 249.8 Up 04:23:20 - 04:50:02 -2618
PNWRO 04:37:08 -14.2 AT Up 52.8 253.4 Up 04:23:47 - 04:50:29 -2626
Manson/Chelan 04:36:43 -12.2 AT Up 53.1 249.6 Up 04:23:22 - 04:50:04 -2644
Patrick 04:39:15 -24.5 Dark Up 50.1 271.0 Up 04:25:54 - 04:52:36 -2658
Wenatchee 04:36:48 -12.5 AT Up 53.4 250.1 Up 04:23:27 - 04:50:09 -2668
Ellensburg 04:36:52 -12.6 AT Up 53.7 250.4 Up 04:23:31 - 04:50:13 -2693
Toppenish/White Swan 04:36:59 -13.1 AT Up 53.7 251.4 Up 04:23:38 - 04:50:20 -2703
Yakima 04:36:57 -12.9 AT Up 53.8 250.9 Up 04:23:36 - 04:50:18 -2706
Laughlin/Bullhead City 04:39:15 -24.2 Dark Up 50.6 270.9 Up 04:25:54 - 04:52:36 -2715
Lake Havasu City 04:39:25 -24.8 Dark Up 50.4 271.9 Up 04:26:04 - 04:52:46 -2723
The Dalles 04:37:06 -13.2 AT Up 54.5 251.6 Up 04:23:45 - 04:50:27 -2774
Maupin 04:37:11 -13.6 AT Up 54.5 252.3 Up 04:23:50 - 04:50:32 -2781
Beatty 04:38:52 -21.7 Dark Up 52.5 267.3 Up 04:25:31 - 04:52:13 -2796
Victoria 04:36:26 -10.1 NT Up 54.9 245.2 Up 04:23:05 - 04:49:47 -2810
Yuma 04:39:44 -25.9 Dark Up 50.5 273.9 Up 04:26:23 - 04:53:05 -2814
Bend 04:37:15 -14.2 AT Up 55.0 253.6 Up 04:23:54 - 04:50:36 -2833
Sisters 04:37:15 -13.9 AT Up 55.1 253.0 Up 04:23:54 - 04:50:36 -2841
Oregon Observatory 04:37:15 -14.2 AT Up 55.2 253.7 Up 04:23:54 - 04:50:36 -2848
Calipatria 04:39:37 -25.0 Dark Up 51.3 273.0 Up 04:26:16 - 04:52:58 -2858
Hawthorne 04:38:31 -19.4 Dark Up 53.9 263.8 Up 04:25:10 - 04:51:52 -2859
Cedarville 04:37:15 -16.4 AT Up 54.8 258.2 Up 04:23:54 - 04:50:36 -2872
Yerington 04:38:22 -18.8 Dark Up 54.3 262.7 Up 04:25:01 - 04:51:43 -2876
Bishop 04:38:45 -20.4 Dark Up 53.8 265.6 Up 04:25:24 - 04:52:06 -2887
Carson City 04:38:22 -18.3 Dark Up 54.7 262.0 Up 04:25:01 - 04:51:43 -2911
Lee Vining 04:38:34 -19.5 Dark Up 54.3 264.2 Up 04:25:13 - 04:51:55 -2912
Idyllwild 04:39:29 -23.9 Dark Up 52.3 271.6 Up 04:26:08 - 04:52:50 -2915
Gardnerville 04:38:24 -18.5 Dark Up 54.7 262.4 Up 04:25:03 - 04:51:45 -2917
Chiloquin 04:37:15 -14.8 AT Up 55.8 255.2 Up 04:23:54 - 04:50:36 -2926
Klamath Falls 04:37:15 -15.0 AT Up 55.8 255.7 Up 04:23:54 - 04:50:36 -2936
Reno 04:37:15 -17.9 AT Up 54.9 261.2 Up 04:23:54 - 04:50:36 -2956
Fall River/Burney 04:37:15 -16.0 AT Up 55.8 257.8 Up 04:23:54 - 04:50:36 -2969
Portola 04:37:15 -17.3 AT Up 55.4 260.3 Up 04:23:54 - 04:50:36 -2979
Gimple 04:37:15 -16.9 AT Up 55.6 259.5 Up 04:23:54 - 04:50:36 -2985
Greenville 04:37:15 -16.8 AT Up 55.7 259.5 Up 04:23:54 - 04:50:36 -2990
Quincy 04:37:15 -17.0 AT Up 55.7 259.8 Up 04:23:54 - 04:50:36 -3001
Wildwood 04:39:18 -22.4 Dark Up 53.9 270.0 Up 04:25:57 - 04:52:39 -3031

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 523655, (2025/05/03 04:37UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 13.26   4
48Iot Cnc      08:46:41.8 +28:45:35  4.0  1.83  12
PPM 099024     08:46:14.3 +27:35:40  8.2  0.69  11
PPM 098996     08:43:55.2 +27:13:26  8.8  0.34  11
PPM 099016     08:45:46.9 +27:07:44 11.8  0.25  11
523655         08:44:55.5 +26:58:05 15.9        11
Positions are for J2000

Event circumstances last updated at 2024/03/19 03:38:38 UT

Marc W. Buie, Southwest Research Institute

RECON