RECON: TNO occultation with 523678

Event between (523678) 13XB26 and star GA0840:04114508 with event index number of 2624843

Geocentric closest approach at 2026/05/23 04:28:43 UTC

J2000 position of star is 12:07:51.1 -04:37:25
Equinox of date position of star is 12:09:06.0 -04:45:32
Stellar brightness G=15.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 35 degrees from the moon. Moon is 47% illuminated.
Apparent brightness V=22.1

[RECON map]
Object is 45.3 AU from the Sun and 44.7 AU from the Earth.
Apparent velocity is 11.5 km/sec on the sky relative to the star, or, 1.3 arcsec/hr.
The 1-sigma error in the time of the event is 186 seconds.
The 1-sigma cross-track error in the shadow position is 2049 km.
The sky-plane scale is 32449.6 km/arcsec.

The object has an absolute magnitude Hv=5.4
Diameter=503.5 km assuming a 5% albedo -- 44.3 sec chord
Diameter=205.6 km assuming a 30% albedo -- 18.1 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 523678, (2026/05/23 04:24UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:35.2 -11:17:54  1.0 20.22  55
4Gam Crv       12:17:10.1 -17:41:18  2.6 13.06  44
PPM 178683     12:07:21.0 -03:16:43  6.4  1.56  34
PPM 195179     12:09:49.0 -04:29:06  8.4  0.32  35
PPM 195158     12:08:34.6 -04:33:18  9.8  0.27  35
523678         12:09:12.4 -04:46:14 15.3        36
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 4.9 sigma about the mid-time.
The median site spacing is 18.4 km RECON observability=0.3 and success probability=20.2%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Sleaford	04:30:56	-10.4	NT	Up	30.6	204.1	Up	04:15:56 - 04:45:56	1501
Dunrhomin	04:29:50	-20.1	Dark	Up	41.1	208.5	Up	04:14:50 - 04:44:50	971
Kamloops	04:32:01	-5.6	CT	Up	34.4	187.8	Up	04:17:01 - 04:47:01	969
Nikitin	04:29:49	-20.3	Dark	Up	41.3	208.5	Up	04:14:49 - 04:44:49	960
Kelowna	04:31:55	-6.5	NT	Up	35.1	189.0	Up	04:16:55 - 04:46:55	959
CU-SBO	04:29:49	-20.3	Dark	Up	41.4	208.5	Up	04:14:49 - 04:44:49	953
Peachland	04:31:55	-6.5	NT	Up	35.3	188.6	Up	04:16:55 - 04:46:55	943
Penticton	04:31:53	-6.7	NT	Up	35.5	188.9	Up	04:16:53 - 04:46:53	939
Summerland	04:31:55	-6.6	NT	Up	35.4	188.8	Up	04:16:55 - 04:46:55	939
Oliver	04:31:52	-7.0	NT	Up	35.8	188.9	Up	04:16:52 - 04:46:52	921
Anarchist Mountain Observatory	04:31:52	-7.2	NT	Up	36.0	189.2	Up	04:16:52 - 04:46:52	920
Okanogan	04:31:49	-7.5	NT	Up	36.6	189.0	Up	04:16:49 - 04:46:49	877
Brewster	04:31:49	-7.6	NT	Up	36.9	188.8	Up	04:16:49 - 04:46:49	856
Manson/Chelan	04:31:50	-7.5	NT	Up	37.2	188.3	Up	04:16:50 - 04:46:50	831
Wenatchee	04:31:49	-7.8	NT	Up	37.7	188.2	Up	04:16:49 - 04:46:49	799
PNWRO	04:31:36	-9.4	NT	Up	38.9	190.1	Up	04:16:36 - 04:46:36	774
Ellensburg	04:31:50	-7.9	NT	Up	38.1	187.9	Up	04:16:50 - 04:46:50	768
Victoria	04:32:11	-5.5	CT	Up	36.8	184.3	Up	04:17:11 - 04:47:11	747
Yakima	04:31:48	-8.2	NT	Up	38.5	187.9	Up	04:16:48 - 04:46:48	745
Toppenish/White Swan	04:31:46	-8.4	NT	Up	38.7	188.2	Up	04:16:46 - 04:46:46	739
The Dalles	04:31:48	-8.5	NT	Up	39.5	187.3	Up	04:16:48 - 04:46:48	664
Maupin	04:31:47	-8.9	NT	Up	39.9	187.4	Up	04:16:47 - 04:46:47	644
Sisters	04:31:46	-9.2	NT	Up	40.9	186.9	Up	04:16:46 - 04:46:46	573
Bend	04:31:44	-9.5	NT	Up	41.1	187.2	Up	04:16:44 - 04:46:44	569
Oregon Observatory	04:31:44	-9.5	NT	Up	41.3	187.1	Up	04:16:44 - 04:46:44	554
Cedarville	04:31:27	-11.7	NT	Up	43.5	189.0	Up	04:16:27 - 04:46:27	460
Chiloquin	04:31:42	-10.1	NT	Up	42.6	186.7	Up	04:16:42 - 04:46:42	456
Klamath Falls	04:31:40	-10.4	NT	Up	42.9	186.8	Up	04:16:40 - 04:46:40	438
Fall River/Burney	04:31:33	-11.4	NT	Up	44.1	187.4	Up	04:16:33 - 04:46:33	379
Reno	04:31:17	-13.2	AT	Up	45.4	189.7	Up	04:16:17 - 04:46:17	347
Gimple	04:31:26	-12.3	AT	Up	44.9	188.2	Up	04:16:26 - 04:46:26	342
Greenville	04:31:26	-12.2	AT	Up	44.9	188.1	Up	04:16:26 - 04:46:26	339
Yerington	04:31:11	-14.0	AT	Up	45.8	190.7	Up	04:16:11 - 04:46:11	338
Portola	04:31:22	-12.7	AT	Up	45.2	188.8	Up	04:16:22 - 04:46:22	337
Hawthorne	04:31:06	-14.6	AT	Up	46.2	191.5	Up	04:16:06 - 04:46:06	330
Quincy	04:31:26	-12.3	AT	Up	45.1	188.1	Up	04:16:26 - 04:46:26	326
Carson City	04:31:17	-13.5	AT	Up	45.7	189.8	Up	04:16:17 - 04:46:17	325
Patrick	04:30:21	-19.4	Dark	Up	48.3	199.0	Up	04:15:21 - 04:45:21	325
Gardnerville	04:31:15	-13.7	AT	Up	46.0	189.9	Up	04:16:15 - 04:46:15	311
Beatty	04:30:46	-16.7	AT	Up	47.5	194.5	Up	04:15:46 - 04:45:46	301
George/Scottsdale	04:29:59	-21.7	Dark	Up	49.3	202.5	Up	04:14:59 - 04:44:59	296
Laughlin/Bullhead City	04:30:25	-19.1	Dark	Up	48.7	198.1	Up	04:15:25 - 04:45:25	277
Lee Vining	04:31:06	-14.7	AT	Up	46.8	191.0	Up	04:16:06 - 04:46:06	273
Bishop	04:30:59	-15.5	AT	Up	47.3	192.1	Up	04:15:59 - 04:45:59	263
Lake Havasu City	04:30:20	-19.7	Dark	Up	49.3	198.7	Up	04:15:20 - 04:45:20	242
Yuma	04:30:14	-20.8	Dark	Up	51.0	198.9	Up	04:15:14 - 04:45:14	104
Calipatria	04:30:22	-20.0	Dark	Up	50.9	197.4	Up	04:15:22 - 04:45:22	95
Idyllwild	04:30:33	-18.9	Dark	Up	50.5	195.4	Up	04:15:33 - 04:45:33	86
Wildwood	04:30:47	-17.5	AT	Up	50.6	192.5	Up	04:15:47 - 04:45:47	28

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 523678, (2026/05/23 04:24UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 20.22  55
4Gam Crv       12:15:48.1 -17:32:30  2.6 13.06  44
PPM 178683     12:05:59.8 -03:07:54  6.4  1.56  34
PPM 195179     12:08:27.7 -04:20:17  8.4  0.32  35
PPM 195158     12:07:13.4 -04:24:29  9.8  0.27  35
523678         12:07:51.1 -04:37:25 15.3        35
Positions are for J2000

Event circumstances last updated at 2024/04/18 03:44:03 UT

RECON