RECON: TNO occultation with 554099

Event between (554099) 12KU50 and star GA0700:06076456 with event index number of 2240918

Geocentric closest approach at 2025/06/26 06:39:39 UTC

J2000 position of star is 15:58:19.4 -18:54:51
Equinox of date position of star is 15:59:44.3 -18:58:57
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 135 degrees from the moon. Moon is 1% illuminated.
Apparent brightness V=21.6

[RECON map]
Object is 33.1 AU from the Sun and 32.2 AU from the Earth.
Apparent velocity is 19.4 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 72 seconds.
The 1-sigma cross-track error in the shadow position is 1251 km.
The sky-plane scale is 23364.8 km/arcsec.

The object has an absolute magnitude Hv=6.3
Diameter=320.6 km assuming a 5% albedo -- 16.9 sec chord
Diameter=130.9 km assuming a 30% albedo -- 6.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 554099, (2025/06/26 06:43UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.5 -26:29:11  0.9 10.38 144
8Bet1Sco       16:06:55.4 -19:52:23  2.6  1.90 137
47 Lib         15:56:29.0 -19:27:22  5.9  0.91 134
PPM 230949     15:57:05.8 -18:51:50  8.2  0.65 134
PPM 231041     16:00:35.9 -18:58:44  9.9  0.19 135
554099         15:59:47.8 -18:59:08 15.9       135
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 0.0 km RECON observability=0.9 and success probability=0.0%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Sleaford	06:38:29	-14.3	AT	Down	14.7	208.1	Really Low	06:32:01 - 06:44:56	12189
Kamloops	06:39:13	-13.6	AT	Down	19.2	194.5	Really Low	06:32:45 - 06:45:40	12175
Kelowna	06:39:08	-14.6	AT	Down	19.9	195.5	Really Low	06:32:41 - 06:45:36	12144
Peachland	06:39:10	-14.6	AT	Down	20.0	195.2	Low	06:32:42 - 06:45:37	12140
Summerland	06:39:10	-14.8	AT	Down	20.2	195.3	Low	06:32:42 - 06:45:37	12134
Penticton	06:39:10	-14.9	AT	Down	20.2	195.4	Low	06:32:42 - 06:45:37	12131
Oliver	06:39:08	-15.2	AT	Down	20.6	195.5	Low	06:32:41 - 06:45:36	12117
Anarchist Mountain Observatory	06:39:08	-15.4	AT	Down	20.7	195.7	Low	06:32:41 - 06:45:36	12111
Victoria	06:39:22	-14.9	AT	Down	21.8	191.7	Low	06:32:54 - 06:45:49	12087
Okanogan	06:39:08	-16.0	AT	Down	21.4	195.5	Low	06:32:40 - 06:45:35	12084
Brewster	06:39:08	-16.2	AT	Down	21.6	195.3	Low	06:32:41 - 06:45:36	12072
Manson/Chelan	06:39:08	-16.3	AT	Down	21.9	195.0	Low	06:32:41 - 06:45:36	12063
Wenatchee	06:39:09	-16.7	AT	Down	22.4	194.9	Low	06:32:42 - 06:45:37	12043
Ellensburg	06:39:09	-17.0	AT	Down	22.8	194.7	Low	06:32:42 - 06:45:37	12025
Yakima	06:39:10	-17.4	AT	Down	23.2	194.7	Low	06:32:42 - 06:45:37	12007
Toppenish/White Swan	06:39:08	-17.7	AT	Down	23.4	194.9	Low	06:32:41 - 06:45:36	11997
PNWRO	06:39:02	-18.3	Dark	Down	23.5	196.4	Low	06:32:34 - 06:45:29	11980
The Dalles	06:39:10	-18.2	Dark	Down	24.3	194.2	Low	06:32:43 - 06:45:38	11961
Maupin	06:39:10	-18.6	Dark	Down	24.7	194.4	Low	06:32:42 - 06:45:37	11941
Sisters	06:39:11	-19.3	Dark	Down	25.6	194.0	Low	06:32:43 - 06:45:38	11899
Bend	06:39:10	-19.6	Dark	Down	25.8	194.2	Low	06:32:42 - 06:45:37	11888
Oregon Observatory	06:39:10	-19.7	Dark	Down	26.0	194.1	Low	06:32:42 - 06:45:37	11879
Chiloquin	06:39:10	-20.8	Dark	Down	27.4	193.9	Low	06:32:42 - 06:45:37	11812
Klamath Falls	06:39:09	-21.2	Dark	Down	27.7	194.0	Low	06:32:42 - 06:45:37	11794
Cedarville	06:39:02	-22.2	Dark	Down	28.1	195.7	Low	06:32:34 - 06:45:29	11758
Fall River/Burney	06:39:05	-22.3	Dark	Down	28.8	194.5	Low	06:32:38 - 06:45:33	11731
Greenville	06:39:04	-23.3	Dark	Down	29.5	195.1	Low	06:32:36 - 06:45:31	11681
Gimple	06:39:04	-23.3	Dark	Down	29.5	195.2	Low	06:32:36 - 06:45:31	11681
Quincy	06:39:04	-23.5	Dark	Down	29.7	195.2	Low	06:32:36 - 06:45:31	11670
Portola	06:39:00	-23.7	Dark	Down	29.8	195.7	Low	06:32:33 - 06:45:28	11663
Reno	06:38:58	-24.2	Dark	Down	29.9	196.4	Low	06:32:31 - 06:45:26	11648
Dunrhomin	06:38:00	-26.1	Dark	Down	24.8	210.8	Low	06:31:33 - 06:44:28	11638
Carson City	06:38:58	-24.5	Dark	Down	30.2	196.5	Up	06:32:31 - 06:45:26	11628
Nikitin	06:38:00	-26.3	Dark	Down	25.0	210.8	Low	06:31:33 - 06:44:28	11628
CU-SBO	06:38:00	-26.4	Dark	Down	25.1	210.7	Low	06:31:33 - 06:44:28	11624
Yerington	06:38:55	-24.9	Dark	Down	30.3	197.2	Up	06:32:27 - 06:45:22	11616
Gardnerville	06:38:58	-24.8	Dark	Down	30.5	196.6	Up	06:32:30 - 06:45:25	11614
Hawthorne	06:38:52	-25.4	Dark	Down	30.6	197.8	Up	06:32:25 - 06:45:20	11589
Lee Vining	06:38:53	-25.8	Dark	Down	31.2	197.4	Up	06:32:26 - 06:45:21	11557
Bishop	06:38:49	-26.6	Dark	Down	31.6	198.3	Up	06:32:22 - 06:45:17	11520
Beatty	06:38:42	-27.5	Dark	Down	31.7	200.1	Up	06:32:14 - 06:45:09	11490
Patrick	06:38:27	-29.6	Dark	Down	32.2	203.4	Up	06:32:00 - 06:44:55	11390
Laughlin/Bullhead City	06:38:29	-29.6	Dark	Down	32.6	202.7	Up	06:32:02 - 06:44:57	11376
Lake Havasu City	06:38:28	-30.3	Dark	Down	33.2	203.2	Up	06:32:01 - 06:44:56	11332
Wildwood	06:38:46	-29.6	Dark	Down	34.8	198.7	Up	06:32:19 - 06:45:14	11313
Idyllwild	06:38:38	-30.5	Dark	Down	34.6	200.8	Up	06:32:11 - 06:45:06	11288
George/Scottsdale	06:38:16	-31.6	Dark	Down	33.1	205.9	Up	06:31:49 - 06:44:44	11272
Calipatria	06:38:31	-31.3	Dark	Down	34.8	202.2	Up	06:32:04 - 06:44:59	11244
Yuma	06:38:27	-32.0	Dark	Down	34.9	203.3	Up	06:32:00 - 06:44:55	11212

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 554099, (2025/06/26 06:43UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 10.38 144
8Bet1Sco       16:05:26.2 -19:48:20  2.6  1.90 137
47 Lib         15:55:00.4 -19:22:59  5.9  0.91 134
PPM 230949     15:55:37.4 -18:47:28  8.2  0.65 134
PPM 231041     15:59:07.5 -18:54:29  9.9  0.19 135
554099         15:58:19.4 -18:54:51 15.9       135
Positions are for J2000

Event circumstances last updated at 2024/06/13 03:56:42 UT

RECON