RECON: TNO occultation with 552678

Event between (552678) 10JG210 and star GA0820:11786917 with event index number of 2223820

Geocentric closest approach at 2026/07/09 04:47:44 UTC

J2000 position of star is 18:43:42.9 -07:55:18
Equinox of date position of star is 18:44:57.3 -07:53:50
Stellar brightness G=16.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 111 degrees from the moon. Moon is 35% illuminated.
TNO apparent brightness V=20.9

[RECON map]
TNO is 17.6 AU from the Sun and 16.6 AU from the Earth.
The TNO is moving 21.8 km/sec on the sky relative to the star, or, 6.5 arcsec/hr.
The 1-sigma error in the time of the event is 113 seconds.
The 1-sigma cross-track error in the shadow position is 1170 km.
The sky-plane scale is 12063.6 km/arcsec.

The TNO has an absolute magnitude Hv=8.5
Diameter=114.3 km assuming a 5% albedo -- 5.4 sec chord
Diameter=46.7 km assuming a 30% albedo -- 2.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 552678, (2026/07/09 04:46UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:02.3 -26:29:18  0.9 36.84 145
Nunki          18:56:54.5 -26:15:41  2.0 18.58 113
Eps Sct        18:44:57.9 -08:14:49  4.9  0.36 111
PPM 202078     18:45:09.8 -07:42:10  8.5  0.19 111
552678         18:45:09.3 -07:53:36 16.8       111
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 25.1 km RECON observability=0.2 and success probability=0.3%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Kamloops	04:48:41	-5.0	CT	Down	21.1	134.8	Low	04:38:48 - 04:58:33	5253
Kelowna	04:48:42	-5.9	CT	Down	22.1	135.4	Low	04:38:49 - 04:58:34	5210
Peachland	04:48:43	-5.9	CT	Down	22.0	135.1	Low	04:38:50 - 04:58:35	5207
Summerland	04:48:43	-6.0	NT	Down	22.2	135.1	Low	04:38:50 - 04:58:35	5200
Penticton	04:48:42	-6.1	NT	Down	22.3	135.2	Low	04:38:50 - 04:58:35	5196
Oliver	04:48:44	-6.4	NT	Down	22.5	135.1	Low	04:38:52 - 04:58:37	5179
Sleaford	04:48:00	-9.5	NT	Down	25.5	149.3	Low	04:38:08 - 04:57:53	5177
Victoria	04:48:55	-5.1	CT	Down	21.2	131.4	Low	04:39:03 - 04:58:48	5177
Anarchist Mountain Observatory	04:48:44	-6.6	NT	Down	22.7	135.2	Low	04:38:51 - 04:58:36	5171
Okanogan	04:48:46	-7.0	NT	Down	23.1	134.9	Low	04:38:54 - 04:58:39	5141
Brewster	04:48:47	-7.1	NT	Down	23.2	134.6	Low	04:38:55 - 04:58:40	5130
Manson/Chelan	04:48:49	-7.0	NT	Down	23.2	134.2	Low	04:38:57 - 04:58:42	5122
Wenatchee	04:48:51	-7.3	NT	Down	23.4	133.9	Low	04:38:59 - 04:58:44	5100
Ellensburg	04:48:53	-7.5	NT	Down	23.6	133.6	Low	04:39:01 - 04:58:46	5082
Yakima	04:48:55	-7.8	NT	Down	23.9	133.4	Low	04:39:02 - 04:58:47	5061
Toppenish/White Swan	04:48:55	-8.0	NT	Down	24.1	133.5	Low	04:39:02 - 04:58:47	5049
PNWRO	04:48:52	-9.0	NT	Down	25.1	134.8	Low	04:39:00 - 04:58:45	5017
The Dalles	04:48:59	-8.2	NT	Down	24.2	132.5	Low	04:39:07 - 04:58:52	5015
Maupin	04:49:00	-8.5	NT	Down	24.6	132.5	Low	04:39:08 - 04:58:53	4992
Sisters	04:49:04	-8.9	NT	Down	24.9	131.7	Low	04:39:11 - 04:58:56	4949
Bend	04:49:04	-9.2	NT	Down	25.2	131.9	Low	04:39:11 - 04:58:56	4934
Oregon Observatory	04:49:05	-9.2	NT	Down	25.3	131.7	Low	04:39:13 - 04:58:58	4926
Chiloquin	04:49:10	-9.9	NT	Down	25.9	130.9	Low	04:39:18 - 04:59:03	4855
Klamath Falls	04:49:12	-10.2	NT	Down	26.2	130.8	Low	04:39:19 - 04:59:04	4834
Cedarville	04:49:09	-11.6	NT	Down	27.6	132.0	Low	04:39:17 - 04:59:02	4780
Fall River/Burney	04:49:14	-11.2	NT	Down	27.2	130.7	Low	04:39:22 - 04:59:07	4761
Greenville	04:49:16	-12.1	AT	Down	28.0	130.8	Low	04:39:23 - 04:59:08	4703
Gimple	04:49:15	-12.2	AT	Down	28.1	130.9	Low	04:39:23 - 04:59:08	4702
Quincy	04:49:16	-12.3	AT	Down	28.2	130.7	Low	04:39:24 - 04:59:09	4690
Portola	04:49:15	-12.6	AT	Down	28.5	131.1	Low	04:39:23 - 04:59:08	4678
Reno	04:49:14	-13.1	AT	Down	29.1	131.6	Low	04:39:22 - 04:59:07	4656
Carson City	04:49:15	-13.4	AT	Down	29.3	131.5	Low	04:39:23 - 04:59:08	4633
Gardnerville	04:49:16	-13.6	AT	Down	29.5	131.4	Low	04:39:24 - 04:59:09	4617
Yerington	04:49:14	-13.9	AT	Down	29.8	132.0	Low	04:39:21 - 04:59:06	4615
Hawthorne	04:49:14	-14.5	AT	Down	30.5	132.3	Up	04:39:21 - 04:59:06	4580
Lee Vining	04:49:17	-14.7	AT	Down	30.6	131.6	Up	04:39:25 - 04:59:10	4549
Dunrhomin	04:48:26	-19.7	Dark	Down	35.8	146.5	Up	04:38:34 - 04:58:19	4525
CU-SBO	04:48:27	-19.9	Dark	Down	36.0	146.3	Up	04:38:35 - 04:58:20	4510
Bishop	04:49:16	-15.5	AT	Down	31.4	132.0	Up	04:39:24 - 04:59:09	4502
Beatty	04:49:13	-16.7	AT	Down	32.6	133.3	Up	04:39:20 - 04:59:05	4453
Patrick	04:49:07	-19.4	Dark	Down	35.3	135.4	Up	04:39:15 - 04:59:00	4318
Laughlin/Bullhead City	04:49:10	-19.2	Dark	Down	35.1	134.5	Up	04:39:18 - 04:59:03	4309
Wildwood	04:49:26	-17.7	AT	Down	33.4	130.3	Up	04:39:34 - 04:59:19	4279
Lake Havasu City	04:49:11	-19.8	Dark	Down	35.7	134.5	Up	04:39:19 - 04:59:04	4259
Idyllwild	04:49:21	-19.0	Dark	Down	34.8	131.8	Up	04:39:29 - 04:59:14	4234
Calipatria	04:49:19	-20.2	Dark	Down	36.0	132.6	Up	04:39:26 - 04:59:11	4174
George/Scottsdale	04:49:05	-21.7	Dark	Down	37.7	136.5	Up	04:39:13 - 04:58:58	4172
Yuma	04:49:18	-21.0	Dark	Down	36.8	133.2	Up	04:39:25 - 04:59:10	4132

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 552678, (2026/07/09 04:46UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 36.84 145
Nunki          18:55:15.9 -26:17:49  2.0 18.58 113
Eps Sct        18:43:31.3 -08:16:31  4.9  0.36 111
PPM 202078     18:43:43.5 -07:43:52  8.5  0.19 111
552678         18:43:42.9 -07:55:18 16.8       111
Positions are for J2000

Event circumstances last updated at 2022/11/04 03:55:49 UT

RECON