RECON: TNO occultation with 523634

Event between (523634) 10AH2 and star GA1080:03268113 with event index number of 2263015

Geocentric closest approach at 2025/06/06 04:54:36 UTC

J2000 position of star is 10:00:07.9 +18:43:51
Equinox of date position of star is 10:01:28.5 +18:36:46
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 54 degrees from the moon. Moon is 78% illuminated.
Apparent brightness V=21.9

[RECON map]
Object is 39.0 AU from the Sun and 39.3 AU from the Earth.
Apparent velocity is 14.5 km/sec on the sky relative to the star, or, 1.8 arcsec/hr.
The 1-sigma error in the time of the event is 135 seconds.
The 1-sigma cross-track error in the shadow position is 1538 km.
The sky-plane scale is 28499.4 km/arcsec.

The object has an absolute magnitude Hv=5.8
Diameter=409.3 km assuming a 5% albedo -- 28.6 sec chord
Diameter=167.1 km assuming a 30% albedo -- 11.7 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 523634, (2025/06/06 04:53UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:43.5 +11:50:31  1.3  7.05  50
30Eta Leo      10:08:42.9 +16:38:16  3.5  2.61  52
PPM 127074     10:05:16.5 +18:49:37  8.0  0.91  54
PPM 127035     10:03:03.6 +18:29:33  9.8  0.38  54
PPM 126992     10:00:27.3 +18:53:22 10.5  0.38  55
523634         10:01:31.8 +18:36:29 16.0        54
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 9.2 km RECON observability=0.4 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	04:56:14	-10.3	NT	Up	25.1	268.6	Low	04:44:32 - 05:07:57	4300
Dunrhomin	04:57:39	-21.0	Dark	Up	23.9	274.8	Low	04:45:57 - 05:09:22	3888
Nikitin	04:57:39	-21.1	Dark	Up	23.9	274.9	Low	04:45:56 - 05:09:21	3879
CU-SBO	04:57:39	-21.2	Dark	Up	24.0	274.9	Low	04:45:56 - 05:09:21	3873
Kamloops	04:56:06	-6.2	NT	Up	34.2	257.5	Up	04:44:24 - 05:07:49	3804
Kelowna	04:56:13	-7.2	NT	Up	33.8	258.8	Up	04:44:30 - 05:07:55	3803
Peachland	04:56:12	-7.2	NT	Up	34.0	258.6	Up	04:44:29 - 05:07:54	3788
Penticton	04:56:14	-7.4	NT	Up	33.9	259.0	Up	04:44:32 - 05:07:57	3786
Summerland	04:56:14	-7.3	NT	Up	34.0	258.8	Up	04:44:32 - 05:07:57	3785
Anarchist Mountain Observatory	04:56:18	-7.9	NT	Up	33.9	259.5	Up	04:44:35 - 05:08:00	3772
Oliver	04:56:18	-7.7	NT	Up	34.0	259.2	Up	04:44:35 - 05:08:00	3772
Okanogan	04:56:23	-8.3	NT	Up	34.1	259.7	Up	04:44:41 - 05:08:06	3737
Brewster	04:56:25	-8.4	NT	Up	34.3	259.8	Up	04:44:42 - 05:08:07	3718
Manson/Chelan	04:56:25	-8.4	NT	Up	34.6	259.6	Up	04:44:42 - 05:08:07	3696
Wenatchee	04:56:28	-8.7	NT	Up	34.8	259.8	Up	04:44:46 - 05:08:11	3669
PNWRO	04:56:41	-10.4	NT	Up	34.0	261.9	Up	04:44:58 - 05:08:23	3659
Ellensburg	04:56:31	-8.9	NT	Up	35.0	259.9	Up	04:44:49 - 05:08:14	3643
Yakima	04:56:35	-9.2	NT	Up	35.0	260.2	Up	04:44:52 - 05:08:17	3623
Toppenish/White Swan	04:56:36	-9.4	NT	Up	35.0	260.5	Up	04:44:53 - 05:08:18	3620
Victoria	04:56:14	-6.4	NT	Up	36.6	256.4	Up	04:44:32 - 05:07:57	3606
The Dalles	04:56:39	-9.6	NT	Up	35.6	260.4	Up	04:44:57 - 05:08:22	3554
Maupin	04:56:43	-10.0	NT	Up	35.6	260.8	Up	04:45:00 - 05:08:25	3538
Sisters	04:56:47	-10.4	NT	Up	36.1	261.0	Up	04:45:04 - 05:08:29	3477
Bend	04:56:50	-10.7	NT	Up	35.9	261.4	Up	04:45:07 - 05:08:32	3475
Oregon Observatory	04:56:50	-10.8	NT	Up	36.0	261.4	Up	04:45:08 - 05:08:33	3461
Cedarville	04:57:09	-13.2	AT	Up	35.4	264.1	Up	04:45:26 - 05:08:51	3391
Chiloquin	04:56:59	-11.5	NT	Up	36.5	262.1	Up	04:45:17 - 05:08:42	3378
Klamath Falls	04:57:02	-11.8	NT	Up	36.5	262.4	Up	04:45:19 - 05:08:44	3363
Fall River/Burney	04:57:09	-12.9	AT	Up	36.3	263.6	Up	04:45:26 - 05:08:51	3316
Patrick	04:58:01	-21.1	Dark	Up	30.4	272.3	Up	04:46:19 - 05:09:44	3310
Reno	04:57:23	-14.9	AT	Up	35.2	265.8	Up	04:45:40 - 05:09:05	3299
Yerington	04:57:28	-15.6	AT	Up	34.7	266.7	Up	04:45:46 - 05:09:11	3295
George/Scottsdale	04:58:15	-23.5	Dark	Up	28.6	274.3	Low	04:46:33 - 05:09:58	3294
Hawthorne	04:57:32	-16.2	AT	Up	34.3	267.3	Up	04:45:49 - 05:09:14	3291
Gimple	04:57:17	-13.9	AT	Up	36.0	264.7	Up	04:45:34 - 05:08:59	3288
Portola	04:57:21	-14.3	AT	Up	35.7	265.2	Up	04:45:38 - 05:09:03	3287
Greenville	04:57:16	-13.8	AT	Up	36.1	264.6	Up	04:45:34 - 05:08:59	3285
Carson City	04:57:25	-15.1	AT	Up	35.2	266.1	Up	04:45:43 - 05:09:08	3280
Beatty	04:57:46	-18.5	Dark	Up	32.8	269.6	Up	04:46:03 - 05:09:28	3277
Quincy	04:57:18	-14.0	AT	Up	36.1	264.7	Up	04:45:35 - 05:09:00	3273
Gardnerville	04:57:27	-15.3	AT	Up	35.2	266.3	Up	04:45:45 - 05:09:10	3268
Laughlin/Bullhead City	04:58:01	-21.0	Dark	Up	31.0	272.0	Up	04:46:19 - 05:09:44	3266
Lee Vining	04:57:35	-16.4	AT	Up	34.7	267.4	Up	04:45:53 - 05:09:18	3239
Lake Havasu City	04:58:08	-21.6	Dark	Up	30.7	272.6	Up	04:46:25 - 05:09:50	3238
Bishop	04:57:41	-17.3	AT	Up	34.2	268.3	Up	04:45:59 - 05:09:24	3235
Yuma	04:58:17	-22.9	Dark	Up	30.9	273.5	Up	04:46:35 - 05:10:00	3116
Calipatria	04:58:12	-22.1	Dark	Up	31.7	272.8	Up	04:46:30 - 05:09:55	3104
Idyllwild	04:58:08	-20.9	Dark	Up	32.7	271.7	Up	04:46:25 - 05:09:50	3092
Wildwood	04:58:03	-19.6	Dark	Up	34.3	270.4	Up	04:46:20 - 05:09:45	3032

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 523634, (2025/06/06 04:53UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3  7.05  50
30Eta Leo      10:07:19.9 +16:45:46  3.5  2.61  52
PPM 127074     10:03:52.7 +18:57:03  8.0  0.91  54
PPM 127035     10:01:39.8 +18:36:56  9.8  0.38  54
PPM 126992     09:59:03.2 +19:00:43 10.5  0.38  55
523634         10:00:07.9 +18:43:51 16.0        54
Positions are for J2000

Event circumstances last updated at 2024/06/13 03:54:15 UT

RECON