RECON: TNO occultation with 531142

Event between (531142) 12FL84 and star GA0720:05453560 with event index number of 2432336

Geocentric closest approach at 2025/07/07 06:00:33 UTC

J2000 position of star is 15:16:05.8 -17:52:09
Equinox of date position of star is 15:17:29.0 -17:57:29
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 14 degrees from the moon. Moon is 87% illuminated.
Apparent brightness V=23.1

[RECON map]
Object is 42.0 AU from the Sun and 41.4 AU from the Earth.
Apparent velocity is 12.5 km/sec on the sky relative to the star, or, 1.5 arcsec/hr.
The 1-sigma error in the time of the event is 330 seconds.
The 1-sigma cross-track error in the shadow position is 3829 km.
The sky-plane scale is 30008.1 km/arcsec.

The object has an absolute magnitude Hv=6.8
Diameter=263.0 km assuming a 5% albedo -- 21.1 sec chord
Diameter=107.4 km assuming a 30% albedo -- 8.6 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 531142, (2025/07/07 06:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.6 -26:29:11  0.9 18.98   6
27Bet Lib      15:18:23.0 -09:28:32  2.6  8.49  20
28 Lib         15:22:20.8 -18:14:58  6.4  1.18  12
26 Lib         15:16:00.4 -17:51:44  6.6  0.38  14
531142         15:17:32.6 -17:57:43 16.6        13
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 2.7 sigma about the mid-time.
The median site spacing is 20.5 km RECON observability=0.7 and success probability=6.9%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Kamloops	05:58:40	-11.5	NT	Up	17.8	205.7	Really Low	05:43:40 - 06:13:40	129
Kelowna	05:58:33	-12.5	AT	Up	18.3	206.7	Really Low	05:43:33 - 06:13:33	90
Peachland	05:58:34	-12.5	AT	Up	18.5	206.4	Really Low	05:43:34 - 06:13:34	87
Summerland	05:58:33	-12.7	AT	Up	18.6	206.5	Really Low	05:43:33 - 06:13:33	80
Penticton	05:58:32	-12.8	AT	Up	18.6	206.6	Really Low	05:43:32 - 06:13:32	77
Sleaford	05:57:39	-13.8	AT	Up	11.9	218.6	Really Low	05:42:39 - 06:12:39	71
Oliver	05:58:31	-13.1	AT	Up	18.9	206.7	Really Low	05:43:31 - 06:13:31	61
Anarchist Mountain Observatory	05:58:30	-13.3	AT	Up	19.0	206.9	Really Low	05:43:30 - 06:13:30	53
Victoria	05:58:50	-12.4	AT	Up	20.6	203.1	Low	05:43:50 - 06:13:50	53
Okanogan	05:58:29	-13.8	AT	Up	19.7	206.8	Really Low	05:43:29 - 06:13:29	25
Brewster	05:58:29	-13.9	AT	Up	20.0	206.6	Really Low	05:43:29 - 06:13:29	14
Manson/Chelan	05:58:31	-14.0	AT	Up	20.3	206.3	Low	05:43:31 - 06:13:31	7
Wenatchee	05:58:30	-14.4	AT	Up	20.8	206.2	Low	05:43:30 - 06:13:30	-14
Ellensburg	05:58:30	-14.6	AT	Up	21.2	206.1	Low	05:43:30 - 06:13:30	-32
Yakima	05:58:29	-15.0	AT	Up	21.6	206.1	Low	05:43:29 - 06:13:29	-51
Toppenish/White Swan	05:58:27	-15.2	AT	Up	21.7	206.3	Low	05:43:27 - 06:13:27	-63
PNWRO	05:58:18	-16.1	AT	Up	21.6	207.8	Low	05:43:18 - 06:13:18	-90
The Dalles	05:58:30	-15.6	AT	Up	22.6	205.7	Low	05:43:30 - 06:13:30	-96
Maupin	05:58:28	-16.0	AT	Up	23.0	205.9	Low	05:43:28 - 06:13:28	-118
Sisters	05:58:28	-16.6	AT	Up	23.9	205.6	Low	05:43:28 - 06:13:28	-159
Bend	05:58:26	-16.9	AT	Up	24.1	205.9	Low	05:43:26 - 06:13:26	-173
Oregon Observatory	05:58:26	-17.0	AT	Up	24.3	205.8	Low	05:43:26 - 06:13:26	-181
Chiloquin	05:58:25	-17.9	AT	Up	25.6	205.6	Low	05:43:25 - 06:13:25	-250
Klamath Falls	05:58:24	-18.2	Dark	Up	25.9	205.8	Low	05:43:24 - 06:13:24	-269
Cedarville	05:58:13	-19.4	Dark	Up	26.0	207.5	Low	05:43:13 - 06:13:13	-318
Fall River/Burney	05:58:18	-19.4	Dark	Up	26.8	206.4	Low	05:43:18 - 06:13:18	-338
Greenville	05:58:14	-20.3	Dark	Up	27.5	207.0	Low	05:43:14 - 06:13:14	-393
Gimple	05:58:13	-20.4	Dark	Up	27.5	207.1	Low	05:43:13 - 06:13:13	-394
Quincy	05:58:13	-20.5	Dark	Up	27.7	207.1	Low	05:43:13 - 06:13:13	-405
Portola	05:58:10	-20.8	Dark	Up	27.6	207.5	Low	05:43:10 - 06:13:10	-416
Reno	05:58:05	-21.3	Dark	Up	27.6	208.2	Low	05:43:05 - 06:13:05	-436
Carson City	05:58:04	-21.6	Dark	Up	27.9	208.3	Low	05:43:04 - 06:13:04	-458
Gardnerville	05:58:03	-21.8	Dark	Up	28.1	208.5	Low	05:43:03 - 06:13:03	-473
Yerington	05:58:00	-22.0	Dark	Up	27.9	209.0	Low	05:43:00 - 06:13:00	-474
Hawthorne	05:57:55	-22.6	Dark	Up	28.1	209.6	Low	05:42:55 - 06:12:55	-507
Lee Vining	05:57:56	-22.9	Dark	Up	28.8	209.3	Low	05:42:56 - 06:12:56	-538
Dunrhomin	05:56:45	-25.2	Dark	Up	20.8	221.3	Low	05:41:45 - 06:11:45	-541
Nikitin	05:56:44	-25.3	Dark	Up	20.9	221.4	Low	05:41:44 - 06:11:44	-552
CU-SBO	05:56:44	-25.4	Dark	Up	21.0	221.3	Low	05:41:44 - 06:11:44	-555
Bishop	05:57:51	-23.7	Dark	Up	29.0	210.2	Low	05:42:51 - 06:12:51	-582
Beatty	05:57:39	-24.7	Dark	Up	28.7	211.9	Low	05:42:39 - 06:12:39	-625
Patrick	05:57:17	-27.1	Dark	Up	28.7	215.0	Low	05:42:17 - 06:12:17	-750
Laughlin/Bullhead City	05:57:21	-27.1	Dark	Up	29.3	214.4	Low	05:42:21 - 06:12:21	-760
Wildwood	05:57:43	-26.4	Dark	Up	31.9	210.9	Up	05:42:43 - 06:12:43	-796
Lake Havasu City	05:57:17	-27.7	Dark	Up	29.7	214.9	Low	05:42:17 - 06:12:17	-808
Idyllwild	05:57:30	-27.5	Dark	Up	31.4	212.8	Up	05:42:30 - 06:12:30	-836
George/Scottsdale	05:56:59	-29.3	Dark	Up	29.2	217.4	Low	05:41:59 - 06:11:59	-887
Calipatria	05:57:21	-28.5	Dark	Up	31.4	214.2	Up	05:42:21 - 06:12:21	-891
Yuma	05:57:14	-29.2	Dark	Up	31.3	215.2	Up	05:42:14 - 06:12:14	-931

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 531142, (2025/07/07 06:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 18.98   6
27Bet Lib      15:17:00.3 -09:22:59  2.6  8.49  20
28 Lib         15:20:53.7 -18:09:32  6.4  1.18  12
26 Lib         15:14:33.7 -17:46:07  6.6  0.38  14
531142         15:16:05.8 -17:52:09 16.6        14
Positions are for J2000

Event circumstances last updated at 2024/06/13 03:57:48 UT

RECON