RECON: TNO occultation with 523686

Event between (523686) 14DB143 and star GA0860:09087358 with event index number of 2622641

Geocentric closest approach at 2025/10/05 02:10:46 UTC

J2000 position of star is 18:41:39.7 -02:13:57
Equinox of date position of star is 18:42:56.2 -02:12:27
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 65 degrees from the moon. Moon is 94% illuminated.
Apparent brightness V=22.4

[RECON map]
Object is 20.3 AU from the Sun and 20.3 AU from the Earth.
Apparent velocity is 12.3 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 150 seconds.
The 1-sigma cross-track error in the shadow position is 2569 km.
The sky-plane scale is 14718.1 km/arcsec.

The object has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 7.3 sec chord
Diameter=37.2 km assuming a 30% albedo -- 3.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523686, (2025/10/05 02:11UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:59.5 -26:29:13  0.9 39.89  94
60Bet Oph      17:44:44.8 +04:33:30  2.8 16.05  80
5 Aql          18:47:48.4 -00:55:56  6.2  1.75  64
PPM 180390     18:40:33.6 -01:55:39  8.4  0.67  66
PPM 202043     18:43:35.8 -02:18:06  9.6  0.18  65
523686         18:43:00.2 -02:12:22 16.4        65
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 7.6 km RECON observability=0.1 and success probability=0.4%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Sleaford	02:06:28	-15.1	AT	Up	33.3	203.3	Up	01:53:29 - 02:19:28	7200
Dunrhomin	02:07:42	-18.0	Dark	Up	43.6	208.7	Up	01:54:42 - 02:20:41	6920
Nikitin	02:07:43	-18.1	Dark	Up	43.8	208.8	Up	01:54:44 - 02:20:43	6913
CU-SBO	02:07:43	-18.0	Dark	Up	43.9	208.7	Up	01:54:43 - 02:20:42	6906
Kelowna	02:05:49	-6.8	NT	Up	37.7	187.1	Up	01:52:50 - 02:18:49	6430
Penticton	02:05:50	-6.7	NT	Up	38.0	187.0	Up	01:52:50 - 02:18:49	6413
Kamloops	02:05:42	-6.2	NT	Up	36.9	185.8	Up	01:52:42 - 02:18:41	6413
Peachland	02:05:49	-6.6	NT	Up	37.8	186.7	Up	01:52:49 - 02:18:48	6410
Summerland	02:05:49	-6.7	NT	Up	38.0	186.8	Up	01:52:50 - 02:18:49	6409
Anarchist Mountain Observatory	02:05:53	-6.9	NT	Up	38.5	187.3	Up	01:52:54 - 02:18:53	6403
Oliver	02:05:52	-6.7	NT	Up	38.4	187.0	Up	01:52:53 - 02:18:52	6399
Okanogan	02:05:59	-6.8	NT	Up	39.2	187.1	Up	01:53:00 - 02:18:59	6365
Brewster	02:05:56	-6.6	NT	Up	39.5	186.9	Up	01:52:57 - 02:18:56	6343
Manson/Chelan	02:05:56	-6.4	NT	Up	39.7	186.4	Up	01:52:57 - 02:18:56	6314
PNWRO	02:06:06	-7.3	NT	Up	41.4	188.3	Up	01:53:07 - 02:19:06	6310
Wenatchee	02:05:57	-6.3	NT	Up	40.2	186.2	Up	01:52:58 - 02:18:57	6284
Ellensburg	02:05:59	-6.1	NT	Up	40.6	186.0	Up	01:52:59 - 02:18:58	6254
Toppenish/White Swan	02:06:02	-6.2	NT	Up	41.2	186.3	Up	01:53:03 - 02:19:02	6237
Yakima	02:06:00	-6.1	NT	Up	41.0	186.0	Up	01:53:01 - 02:19:00	6236
George/Scottsdale	02:07:54	-13.5	AT	Up	51.8	202.5	Up	01:54:54 - 02:20:53	6222
Patrick	02:07:34	-11.7	NT	Up	50.8	198.6	Up	01:54:35 - 02:20:34	6164
The Dalles	02:05:59	-5.6	CT	Up	42.0	185.3	Up	01:53:00 - 02:18:59	6156
Victoria	02:05:41	-4.2	CT	Up	39.2	182.1	Up	01:52:41 - 02:18:40	6156
Maupin	02:06:05	-5.7	CT	Up	42.5	185.5	Up	01:53:06 - 02:19:05	6144
Laughlin/Bullhead City	02:07:29	-11.1	NT	Up	51.2	197.6	Up	01:54:29 - 02:20:28	6104
Lake Havasu City	02:07:38	-11.3	NT	Up	51.8	198.3	Up	01:54:38 - 02:20:37	6089
Bend	02:06:08	-5.6	CT	Up	43.6	185.3	Up	01:53:08 - 02:19:07	6080
Sisters	02:06:08	-5.4	CT	Up	43.4	184.9	Up	01:53:08 - 02:19:07	6075
Oregon Observatory	02:06:10	-5.5	CT	Up	43.8	185.1	Up	01:53:10 - 02:19:09	6064
Beatty	02:07:09	-9.2	NT	Up	50.1	193.5	Up	01:54:10 - 02:20:09	6038
Cedarville	02:06:27	-6.4	NT	Up	46.0	187.3	Up	01:53:28 - 02:19:27	6034
Hawthorne	02:06:50	-7.6	NT	Up	48.8	190.2	Up	01:53:51 - 02:19:50	5991
Yuma	02:07:44	-11.1	NT	Up	53.6	198.6	Up	01:54:44 - 02:20:43	5979
Yerington	02:06:45	-7.2	NT	Up	48.4	189.2	Up	01:53:45 - 02:19:44	5979
Chiloquin	02:06:15	-5.1	CT	Up	45.1	184.7	Up	01:53:16 - 02:19:15	5976
Klamath Falls	02:06:18	-5.2	CT	Up	45.4	184.8	Up	01:53:19 - 02:19:18	5965
Reno	02:06:38	-6.7	NT	Up	47.9	188.1	Up	01:53:38 - 02:19:37	5962
Bishop	02:06:58	-7.8	NT	Up	49.9	190.8	Up	01:53:59 - 02:19:58	5951
Carson City	02:06:41	-6.7	NT	Up	48.3	188.2	Up	01:53:42 - 02:19:41	5946
Calipatria	02:07:38	-10.4	NT	Up	53.4	196.9	Up	01:54:38 - 02:20:37	5938
Gardnerville	02:06:44	-6.7	NT	Up	48.5	188.4	Up	01:53:44 - 02:19:43	5938
Portola	02:06:34	-6.2	NT	Up	47.7	187.1	Up	01:53:35 - 02:19:34	5933
Fall River/Burney	02:06:24	-5.5	CT	Up	46.6	185.5	Up	01:53:24 - 02:19:23	5932
Lee Vining	02:06:51	-7.3	NT	Up	49.4	189.5	Up	01:53:52 - 02:19:51	5932
Gimple	02:06:33	-5.9	CT	Up	47.4	186.5	Up	01:53:33 - 02:19:32	5922
Greenville	02:06:33	-5.8	CT	Up	47.4	186.3	Up	01:53:33 - 02:19:32	5917
Quincy	02:06:31	-5.8	CT	Up	47.6	186.3	Up	01:53:31 - 02:19:30	5907
Idyllwild	02:07:31	-9.3	NT	Up	53.1	194.7	Up	01:54:31 - 02:20:30	5886
Wildwood	02:07:17	-7.7	NT	Up	53.1	191.4	Up	01:54:17 - 02:20:16	5771

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, (2025/10/05 02:11UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 39.89  94
60Bet Oph      17:43:28.3 +04:34:06  2.8 16.05  80
5 Aql          18:46:28.6 -00:57:42  6.2  1.75  64
PPM 180390     18:39:13.3 -01:57:09  8.4  0.67  66
PPM 202043     18:42:15.2 -02:19:42  9.6  0.18  65
523686         18:41:39.7 -02:13:57 16.4        65
Positions are for J2000

Event circumstances last updated at 2024/06/18 02:54:42 UT

RECON