RECON: TNO occultation with 523643

Event between (523643) 10TY53 and star GA0880:00305534 with event index number of 2626102

Geocentric closest approach at 2026/12/23 07:38:46 UTC

J2000 position of star is 03:39:05.5 -00:54:29
Equinox of date position of star is 03:40:19.5 -00:49:50
Stellar brightness G=16.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 37 degrees from the moon. Moon is 99% illuminated.
Apparent brightness V=19.7

[RECON map]
Object is 25.4 AU from the Sun and 24.7 AU from the Earth.
Apparent velocity is 18.8 km/sec on the sky relative to the star, or, 3.8 arcsec/hr.
The 1-sigma error in the time of the event is 70 seconds.
The 1-sigma cross-track error in the shadow position is 1038 km.
The sky-plane scale is 17915.5 km/arcsec.

The object has an absolute magnitude Hv=5.5
Diameter=472.1 km assuming a 5% albedo -- 25.9 sec chord
Diameter=192.7 km assuming a 30% albedo -- 10.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523643, (2026/12/23 07:39UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:28.3 +16:33:41  0.8 22.36  15
Menkar         03:03:41.6 +04:11:38  2.5 10.47  40
24 Eri         03:45:52.9 -01:04:47  5.3  1.38  37
PPM 175352     03:41:22.0 -01:02:08  7.2  0.31  37
PPM 175349     03:41:04.6 -00:42:20  9.4  0.19  37
523643         03:40:28.0 -00:49:18 16.5        37
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 22.1 km RECON observability=1.0 and success probability=27.4%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Sleaford	07:37:09	-60.6	Dark	Up	24.7	231.7	Low	07:30:51 - 07:43:27	1900
Kamloops	07:37:45	-62.4	Dark	Up	32.0	217.6	Up	07:31:27 - 07:44:03	1687
Kelowna	07:37:40	-63.3	Dark	Up	32.3	218.9	Up	07:31:22 - 07:43:58	1647
Peachland	07:37:40	-63.4	Dark	Up	32.5	218.6	Up	07:31:22 - 07:43:58	1637
Summerland	07:37:39	-63.5	Dark	Up	32.6	218.7	Up	07:31:21 - 07:43:57	1628
Penticton	07:37:39	-63.6	Dark	Up	32.6	218.9	Up	07:31:21 - 07:43:57	1625
Oliver	07:37:38	-64.0	Dark	Up	32.9	219.0	Up	07:31:20 - 07:43:56	1603
Anarchist Mountain Observatory	07:37:37	-64.2	Dark	Up	32.9	219.3	Up	07:31:19 - 07:43:55	1595
Okanogan	07:37:35	-64.8	Dark	Up	33.5	219.3	Up	07:31:17 - 07:43:53	1551
Brewster	07:37:35	-65.0	Dark	Up	33.8	219.2	Up	07:31:17 - 07:43:53	1532
Victoria	07:37:49	-64.0	Dark	Up	34.9	215.1	Up	07:31:31 - 07:44:07	1520
Manson/Chelan	07:37:36	-65.2	Dark	Up	34.1	218.9	Up	07:31:18 - 07:43:54	1514
Wenatchee	07:37:35	-65.6	Dark	Up	34.6	218.9	Up	07:31:17 - 07:43:53	1481
Ellensburg	07:37:35	-66.0	Dark	Up	35.0	218.9	Up	07:31:17 - 07:43:53	1452
Yakima	07:37:34	-66.4	Dark	Up	35.3	219.0	Up	07:31:16 - 07:43:52	1424
Toppenish/White Swan	07:37:32	-66.6	Dark	Up	35.4	219.3	Up	07:31:14 - 07:43:50	1412
PNWRO	07:37:26	-67.2	Dark	Up	35.0	221.1	Up	07:31:08 - 07:43:44	1403
The Dalles	07:37:33	-67.2	Dark	Up	36.4	218.8	Up	07:31:15 - 07:43:51	1350
Maupin	07:37:31	-67.6	Dark	Up	36.6	219.1	Up	07:31:13 - 07:43:49	1322
Sisters	07:37:31	-68.4	Dark	Up	37.5	218.9	Up	07:31:13 - 07:43:49	1255
Bend	07:37:29	-68.7	Dark	Up	37.6	219.3	Up	07:31:11 - 07:43:47	1242
Oregon Observatory	07:37:29	-68.8	Dark	Up	37.8	219.3	Up	07:31:11 - 07:43:47	1228
Dunrhomin	07:36:23	-71.5	Dark	Up	31.3	237.4	Up	07:30:05 - 07:42:41	1140
Chiloquin	07:37:27	-69.9	Dark	Up	39.0	219.5	Up	07:31:09 - 07:43:45	1128
Nikitin	07:36:23	-71.7	Dark	Up	31.4	237.4	Up	07:30:05 - 07:42:41	1126
CU-SBO	07:36:23	-71.7	Dark	Up	31.5	237.4	Up	07:30:05 - 07:42:41	1121
Klamath Falls	07:37:26	-70.3	Dark	Up	39.2	219.7	Up	07:31:08 - 07:43:44	1104
Cedarville	07:37:18	-71.3	Dark	Up	39.0	221.9	Up	07:31:00 - 07:43:36	1072
Fall River/Burney	07:37:22	-71.5	Dark	Up	40.0	220.8	Up	07:31:04 - 07:43:40	1020
Gimple	07:37:17	-72.5	Dark	Up	40.4	221.9	Up	07:30:59 - 07:43:35	958
Greenville	07:37:17	-72.4	Dark	Up	40.4	221.8	Up	07:30:59 - 07:43:35	957
Quincy	07:37:17	-72.6	Dark	Up	40.6	221.9	Up	07:30:59 - 07:43:35	942
Portola	07:37:15	-72.9	Dark	Up	40.4	222.5	Up	07:30:57 - 07:43:33	938
Reno	07:37:12	-73.3	Dark	Up	40.3	223.3	Up	07:30:54 - 07:43:30	926
Carson City	07:37:11	-73.6	Dark	Up	40.6	223.6	Up	07:30:53 - 07:43:29	898
Yerington	07:37:08	-74.0	Dark	Up	40.4	224.4	Up	07:30:50 - 07:43:26	891
Gardnerville	07:37:10	-73.9	Dark	Up	40.7	223.8	Up	07:30:52 - 07:43:28	880
Hawthorne	07:37:04	-74.5	Dark	Up	40.4	225.2	Up	07:30:46 - 07:43:22	861
Lee Vining	07:37:05	-74.9	Dark	Up	41.1	225.0	Up	07:30:47 - 07:43:23	811
Bishop	07:37:00	-75.7	Dark	Up	41.1	226.2	Up	07:30:42 - 07:43:18	772
Beatty	07:36:53	-76.4	Dark	Up	40.5	228.2	Up	07:30:35 - 07:43:11	755
Patrick	07:36:38	-78.0	Dark	Up	39.7	232.1	Up	07:30:20 - 07:42:56	670
Laughlin/Bullhead City	07:36:40	-78.3	Dark	Up	40.3	231.5	Up	07:30:22 - 07:42:58	641
Lake Havasu City	07:36:37	-78.9	Dark	Up	40.5	232.2	Up	07:30:19 - 07:42:55	589
George/Scottsdale	07:36:25	-79.5	Dark	Up	39.4	235.1	Up	07:30:07 - 07:42:43	554
Wildwood	07:36:53	-78.7	Dark	Up	43.5	228.1	Up	07:30:35 - 07:43:11	502
Idyllwild	07:36:44	-79.5	Dark	Up	42.5	230.3	Up	07:30:26 - 07:43:02	496
Calipatria	07:36:38	-80.3	Dark	Up	42.2	232.0	Up	07:30:20 - 07:42:56	459
Yuma	07:36:33	-80.7	Dark	Up	41.8	233.1	Up	07:30:15 - 07:42:51	434

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 523643, (2026/12/23 07:39UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 22.36  15
Menkar         03:02:16.8 +04:05:21  2.5 10.47  40
24 Eri         03:44:30.5 -01:09:47  5.3  1.38  37
PPM 175352     03:39:59.6 -01:07:17  7.2  0.31  37
PPM 175349     03:39:42.1 -00:47:30  9.4  0.19  37
523643         03:39:05.5 -00:54:29 16.5        37
Positions are for J2000

Event circumstances last updated at 2024/03/05 04:53:19 UT

RECON