RECON: TNO occultation with 523955

Event between (523955) 98UU43 and star GA1080:00893166 with event index number of 2352485

Geocentric closest approach at 2025/02/15 01:49:13 UTC

J2000 position of star is 05:14:29.6 +18:13:30
Equinox of date position of star is 05:15:54.4 +18:15:04
Stellar brightness G=15.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 96 degrees from the moon. Moon is 94% illuminated.
Apparent brightness V=22.7

[RECON map]
Object is 34.3 AU from the Sun and 33.9 AU from the Earth.
Apparent velocity is 7.1 km/sec on the sky relative to the star, or, 1.0 arcsec/hr.
The 1-sigma error in the time of the event is 683 seconds.
The 1-sigma cross-track error in the shadow position is 1701 km.
The sky-plane scale is 24579.0 km/arcsec.

The object has an absolute magnitude Hv=7.2
Diameter=199.5 km assuming a 5% albedo -- 30.5 sec chord
Diameter=81.5 km assuming a 30% albedo -- 12.5 sec chord
Dynamical classification is 4:3E
 
 
 
 
 
 

Star training set for 523955, (2025/02/15 01:50UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:21.9 +16:33:28  0.8  9.36 105
Alnath         05:27:52.9 +28:37:35  1.6 10.73  92
104 Tau        05:08:56.1 +18:40:36  5.6  1.72  97
PPM 120798     05:18:59.4 +17:41:18  8.5  0.91  95
PPM 120758     05:16:34.2 +18:06:07 10.0  0.21  96
523955         05:15:57.7 +18:15:07 15.1        95
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 1.3 sigma about the mid-time.
The median site spacing is 19.2 km RECON observability=0.1 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	01:52:12	-15.2	AT	Down	55.0	161.3	Up	01:37:12 - 02:07:12	8474
Kamloops	01:54:29	-6.5	NT	Down	51.9	139.3	Up	01:39:29 - 02:09:29	8305
Kelowna	01:54:22	-6.8	NT	Down	52.9	139.8	Up	01:39:22 - 02:09:22	8227
Peachland	01:54:25	-6.6	NT	Down	52.9	139.3	Up	01:39:25 - 02:09:25	8216
Summerland	01:54:25	-6.7	NT	Down	53.0	139.3	Up	01:39:25 - 02:09:25	8202
Penticton	01:54:23	-6.7	NT	Down	53.1	139.4	Up	01:39:23 - 02:09:23	8195
Oliver	01:54:25	-6.7	NT	Down	53.4	139.1	Up	01:39:25 - 02:09:25	8161
Anarchist Mountain Observatory	01:54:22	-6.7	NT	Down	53.6	139.3	Up	01:39:22 - 02:09:22	8145
Victoria	01:55:03	-4.1	CT	Down	52.2	133.4	Up	01:40:03 - 02:10:03	8099
Okanogan	01:54:27	-6.5	NT	Down	54.0	138.4	Up	01:39:27 - 02:09:27	8081
Brewster	01:54:32	-6.3	NT	Down	54.1	137.9	Up	01:39:32 - 02:09:32	8055
Manson/Chelan	01:54:37	-6.0	NT	Down	54.1	137.2	Up	01:39:37 - 02:09:37	8034
Wenatchee	01:54:39	-5.8	CT	Down	54.4	136.5	Up	01:39:39 - 02:09:39	7988
Ellensburg	01:54:39	-5.6	CT	Down	54.6	135.8	Up	01:39:39 - 02:09:39	7947
Yakima	01:54:43	-5.5	CT	Down	54.9	135.4	Up	01:39:43 - 02:09:43	7907
Toppenish/White Swan	01:54:39	-5.6	CT	Down	55.1	135.4	Up	01:39:39 - 02:09:39	7885
PNWRO	01:54:30	-6.5	NT	Down	56.1	137.1	Up	01:39:30 - 02:09:30	7848
The Dalles	01:54:53	-4.9	CT	Down	55.3	133.5	Up	01:39:53 - 02:09:53	7808
Maupin	01:54:52	-4.9	CT	Down	55.6	133.2	Up	01:39:52 - 02:09:52	7766
Sisters	01:54:59	-4.3	CT	Down	56.0	131.6	Up	01:39:59 - 02:09:59	7677
Bend	01:54:59	-4.5	CT	Down	56.3	131.7	Up	01:39:59 - 02:09:59	7653
Oregon Observatory	01:54:59	-4.3	CT	Down	56.3	131.4	Up	01:39:59 - 02:09:59	7636
Chiloquin	01:55:07	-3.7	CT	Down	57.0	129.3	Up	01:40:07 - 02:10:07	7502
Klamath Falls	01:55:06	-3.7	CT	Down	57.2	129.0	Up	01:40:06 - 02:10:06	7466
Cedarville	01:54:50	-4.7	CT	Down	58.5	130.3	Up	01:39:50 - 02:09:50	7394
Fall River/Burney	01:55:07	-3.7	CT	Down	58.2	128.1	Up	01:40:07 - 02:10:07	7344
Dunrhomin	01:52:04	-15.2	AT	Down	66.2	154.8	Up	01:37:04 - 02:07:04	7310
Nikitin	01:52:05	-15.2	AT	Down	66.4	154.5	Up	01:37:05 - 02:07:05	7291
CU-SBO	01:52:08	-15.1	AT	Down	66.4	154.3	Up	01:37:08 - 02:07:08	7284
Greenville	01:55:01	-3.8	CT	Down	59.0	127.5	Up	01:40:01 - 02:10:01	7250
Gimple	01:55:02	-3.9	CT	Down	59.0	127.6	Up	01:40:02 - 02:10:02	7249
Quincy	01:55:04	-3.8	CT	Down	59.1	127.3	Up	01:40:04 - 02:10:04	7229
Portola	01:54:59	-4.1	CT	Down	59.5	127.7	Up	01:39:59 - 02:09:59	7215
Reno	01:54:52	-4.5	CT	Down	60.0	128.3	Up	01:39:52 - 02:09:52	7187
Carson City	01:54:53	-4.5	CT	Down	60.3	127.8	Up	01:39:53 - 02:09:53	7150
Yerington	01:54:47	-4.9	CT	Down	60.7	128.5	Up	01:39:47 - 02:09:47	7129
Gardnerville	01:54:52	-4.4	CT	Down	60.4	127.6	Up	01:39:52 - 02:09:52	7124
Hawthorne	01:54:40	-5.2	CT	Down	61.3	128.6	Up	01:39:40 - 02:09:40	7081
Lee Vining	01:54:48	-4.7	CT	Down	61.4	127.1	Up	01:39:48 - 02:09:48	7021
Bishop	01:54:39	-5.1	CT	Down	62.2	127.2	Up	01:39:39 - 02:09:39	6958
Beatty	01:54:22	-6.2	NT	Down	63.5	128.9	Up	01:39:22 - 02:09:22	6911
Patrick	01:53:49	-8.1	NT	Down	66.1	131.2	Up	01:38:49 - 02:08:49	6758
Laughlin/Bullhead City	01:53:59	-7.6	NT	Down	65.9	129.6	Up	01:38:59 - 02:08:59	6730
Lake Havasu City	01:53:56	-7.6	NT	Down	66.5	128.8	Up	01:38:56 - 02:08:56	6659
Wildwood	01:54:46	-4.3	CT	Down	63.9	121.6	Up	01:39:46 - 02:09:46	6609
George/Scottsdale	01:53:25	-9.4	NT	Down	68.4	131.7	Up	01:38:25 - 02:08:25	6583
Idyllwild	01:54:25	-5.6	CT	Down	65.4	123.7	Up	01:39:25 - 02:09:25	6572
Calipatria	01:54:11	-6.5	NT	Down	66.5	124.4	Up	01:39:11 - 02:09:11	6508
Yuma	01:53:59	-7.1	NT	Down	67.3	124.9	Up	01:38:59 - 02:08:59	6464

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 523955, (2025/02/15 01:50UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  9.36 105
Alnath         05:26:17.6 +28:36:23  1.6 10.73  92
104 Tau        05:07:27.8 +18:38:43  5.6  1.72  97
PPM 120798     05:17:31.6 +17:39:47  8.5  0.91  95
PPM 120758     05:15:06.2 +18:04:31 10.0  0.21  96
523955         05:14:29.6 +18:13:30 15.1        96
Positions are for J2000

Event circumstances last updated at 2024/03/02 06:06:56 UT

RECON