RECON: TNO occultation with 523642

Event between (523642) 10SS43 and star GA1300:00434221 with event index number of 2382887

Geocentric closest approach at 2025/09/23 05:07:07 UTC

J2000 position of star is 01:30:21.6 +41:57:52
Equinox of date position of star is 01:31:42.6 +42:04:54
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 146 degrees from the moon. Moon is 2% illuminated.
TNO apparent brightness V=21.6

[RECON map]
TNO is 38.0 AU from the Sun and 37.3 AU from the Earth.
The TNO is moving 21.6 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 103 seconds.
The 1-sigma cross-track error in the shadow position is 2193 km.
The sky-plane scale is 27051.3 km/arcsec.

The TNO has an absolute magnitude Hv=5.7
Diameter=424.6 km assuming a 5% albedo -- 19.9 sec chord
Diameter=173.4 km assuming a 30% albedo -- 8.1 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 523642, (2025/09/23 05:08UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.0 +16:33:33  0.8 47.02 126
57Gam1And      02:05:29.4 +42:27:07  2.3  6.23 143
PPM 044004     01:28:57.1 +41:14:02  6.5  1.02 147
PPM 044045     01:30:57.9 +42:24:50  7.5  0.36 145
PPM 044053     01:31:29.9 +42:07:56  9.0  0.08 146
523642         01:31:52.7 +42:05:47 16.6       145
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 30.0 km RECON observability=1.0 and success probability=23.2%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Kamloops	05:10:03	-28.8	Dark	Down	46.9	76.1	Up	05:00:56 - 05:19:09	1891
Victoria	05:10:14	-28.6	Dark	Down	44.4	72.3	Up	05:01:08 - 05:19:21	1839
Peachland	05:10:04	-29.7	Dark	Down	47.1	75.5	Up	05:00:58 - 05:19:11	1790
Kelowna	05:10:04	-29.7	Dark	Down	47.3	75.8	Up	05:00:57 - 05:19:10	1787
Summerland	05:10:05	-29.8	Dark	Down	47.1	75.4	Up	05:00:59 - 05:19:12	1773
Penticton	05:10:05	-29.9	Dark	Down	47.1	75.4	Up	05:00:59 - 05:19:12	1763
Oliver	05:10:06	-30.1	Dark	Down	47.0	75.1	Up	05:01:00 - 05:19:13	1733
Anarchist Mountain Observatory	05:10:07	-30.4	Dark	Down	47.1	75.0	Up	05:01:00 - 05:19:13	1710
Okanogan	05:10:09	-30.7	Dark	Down	46.8	74.2	Up	05:01:02 - 05:19:15	1664
Brewster	05:10:10	-30.8	Dark	Down	46.6	73.8	Up	05:01:03 - 05:19:16	1649
Manson/Chelan	05:10:11	-30.7	Dark	Down	46.3	73.4	Up	05:01:05 - 05:19:18	1647
Wenatchee	05:10:13	-30.9	Dark	Down	46.1	72.9	Up	05:01:06 - 05:19:19	1613
Ellensburg	05:10:14	-31.1	Dark	Down	45.8	72.3	Up	05:01:08 - 05:19:21	1587
Yakima	05:10:16	-31.3	Dark	Down	45.7	71.9	Up	05:01:09 - 05:19:22	1553
Toppenish/White Swan	05:10:16	-31.6	Dark	Down	45.7	71.8	Up	05:01:10 - 05:19:23	1527
Sleaford	05:09:31	-33.5	Dark	Down	55.9	87.5	Up	05:00:24 - 05:18:37	1500
The Dalles	05:10:20	-31.6	Dark	Down	45.0	70.7	Up	05:01:14 - 05:19:27	1495
Maupin	05:10:21	-32.0	Dark	Down	44.9	70.3	Up	05:01:14 - 05:19:27	1454
PNWRO	05:10:15	-32.6	Dark	Down	46.6	72.2	Up	05:01:08 - 05:19:21	1430
Sisters	05:10:24	-32.2	Dark	Down	44.3	69.3	Up	05:01:18 - 05:19:31	1400
Bend	05:10:25	-32.5	Dark	Down	44.4	69.2	Up	05:01:18 - 05:19:31	1368
Oregon Observatory	05:10:25	-32.6	Dark	Down	44.2	69.0	Up	05:01:19 - 05:19:32	1359
Chiloquin	05:10:30	-33.1	Dark	Down	43.5	67.6	Up	05:01:24 - 05:19:37	1264
Klamath Falls	05:10:31	-33.4	Dark	Down	43.4	67.4	Up	05:01:25 - 05:19:38	1230
Fall River/Burney	05:10:34	-34.3	Dark	Down	43.2	66.5	Up	05:01:27 - 05:19:40	1108
Cedarville	05:10:30	-34.8	Dark	Down	44.2	67.4	Up	05:01:23 - 05:19:36	1093
Greenville	05:10:35	-35.1	Dark	Down	43.2	65.9	Up	05:01:28 - 05:19:41	1007
Gimple	05:10:35	-35.2	Dark	Down	43.2	65.9	Up	05:01:28 - 05:19:41	1002
Quincy	05:10:35	-35.3	Dark	Down	43.1	65.7	Up	05:01:29 - 05:19:42	988
Portola	05:10:35	-35.6	Dark	Down	43.4	65.8	Up	05:01:29 - 05:19:42	954
Reno	05:10:34	-36.2	Dark	Down	43.7	65.8	Up	05:01:28 - 05:19:41	899
Carson City	05:10:35	-36.4	Dark	Down	43.6	65.5	Up	05:01:29 - 05:19:42	866
Gardnerville	05:10:36	-36.6	Dark	Down	43.5	65.3	Up	05:01:29 - 05:19:42	841
Yerington	05:10:34	-36.9	Dark	Down	43.9	65.5	Up	05:01:28 - 05:19:41	817
Hawthorne	05:10:35	-37.5	Dark	Down	44.1	65.3	Up	05:01:28 - 05:19:41	750
Lee Vining	05:10:37	-37.6	Dark	Down	43.5	64.6	Up	05:01:30 - 05:19:43	722
Bishop	05:10:37	-38.4	Dark	Down	43.8	64.3	Up	05:01:30 - 05:19:43	632
Beatty	05:10:34	-39.7	Dark	Down	44.8	64.3	Up	05:01:28 - 05:19:41	511
Wildwood	05:10:45	-40.2	Dark	Down	42.2	61.6	Up	05:01:38 - 05:19:51	342
Dunrhomin	05:09:58	-43.6	Dark	Down	54.3	71.1	Up	05:00:51 - 05:19:04	330
CU-SBO	05:09:59	-43.7	Dark	Down	54.2	70.8	Up	05:00:52 - 05:19:05	310
Laughlin/Bullhead City	05:10:33	-42.2	Dark	Down	45.6	63.3	Up	05:01:27 - 05:19:40	244
Patrick	05:10:31	-42.4	Dark	Down	46.2	63.6	Up	05:01:25 - 05:19:38	234
Idyllwild	05:10:41	-41.7	Dark	Down	43.4	61.6	Up	05:01:35 - 05:19:48	214
Lake Havasu City	05:10:34	-42.7	Dark	Down	45.5	62.7	Up	05:01:27 - 05:19:40	169
Calipatria	05:10:40	-42.8	Dark	Down	44.0	61.3	Up	05:01:33 - 05:19:46	98
Yuma	05:10:38	-43.7	Dark	Down	44.4	61.1	Up	05:01:32 - 05:19:45	13
George/Scottsdale	05:10:29	-44.8	Dark	Down	46.9	62.4	Up	05:01:23 - 05:19:36	-22

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 523642, (2025/09/23 05:08UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 47.02 126
57Gam1And      02:03:54.1 +42:19:46  2.3  6.23 143
PPM 044004     01:27:26.7 +41:06:04  6.5  1.02 147
PPM 044045     01:29:26.7 +42:16:54  7.5  0.36 145
PPM 044053     01:29:58.8 +42:00:00  9.0  0.08 146
523642         01:30:21.6 +41:57:52 16.6       146
Positions are for J2000

Event circumstances last updated at 2022/11/14 02:44:04 UT

RECON