RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star GA0960:02204872 with event index number of 2249863

Geocentric closest approach at 2024/02/11 03:30:08 UTC

J2000 position of star is 06:48:49.9 +06:15:06
Equinox of date position of star is 06:50:06.9 +06:13:24
Stellar brightness G=16.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 121 degrees from the moon. Moon is 2% illuminated.
Apparent brightness V=20.6

[RECON map]
Object is 31.2 AU from the Sun and 30.4 AU from the Earth.
Apparent velocity is 18.7 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 114 seconds.
The 1-sigma cross-track error in the shadow position is 1409 km.
The sky-plane scale is 22080.2 km/arcsec.

The object has an absolute magnitude Hv=5.6
Diameter=524.8 km assuming a 5% albedo -- 24.6 sec chord
Diameter=214.3 km assuming a 30% albedo -- 10.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2024/02/11 03:30UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:28.7 +07:24:34  0.4 13.37 108
Alhena         06:39:06.3 +16:22:36  1.9 10.51 120
PPM 151081     06:43:16.9 +06:19:14  6.2  1.70 120
PPM 151280     06:49:41.6 +06:11:04  8.4  0.11 121
55638          06:50:07.5 +06:13:23 16.1       122
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 26.2 km RECON observability=1.0 and success probability=53.3%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Sleaford	03:32:26	-31.6	Dark	Down	42.7	160.5	Up	03:22:27 - 03:42:24	1558
Kamloops	03:33:13	-23.2	Dark	Down	39.6	141.9	Up	03:23:14 - 03:43:11	1143
Kelowna	03:33:10	-23.8	Dark	Down	40.6	142.6	Up	03:23:12 - 03:43:09	1089
Peachland	03:33:11	-23.7	Dark	Down	40.6	142.1	Up	03:23:13 - 03:43:10	1073
Summerland	03:33:11	-23.7	Dark	Down	40.7	142.2	Up	03:23:13 - 03:43:10	1062
Penticton	03:33:11	-23.8	Dark	Down	40.8	142.3	Up	03:23:12 - 03:43:09	1058
Oliver	03:33:11	-23.9	Dark	Down	41.1	142.1	Up	03:23:12 - 03:43:09	1027
Anarchist Mountain Observatory	03:33:11	-24.0	Dark	Down	41.3	142.2	Up	03:23:12 - 03:43:09	1016
Okanogan	03:33:11	-23.9	Dark	Down	41.7	141.6	Up	03:23:13 - 03:43:10	953
Brewster	03:33:12	-23.8	Dark	Down	41.9	141.2	Up	03:23:13 - 03:43:10	924
Manson/Chelan	03:33:13	-23.6	Dark	Down	41.9	140.7	Up	03:23:15 - 03:43:12	898
Victoria	03:33:23	-21.4	Dark	Down	40.0	137.2	Up	03:23:25 - 03:43:22	893
Wenatchee	03:33:14	-23.5	Dark	Down	42.2	140.2	Up	03:23:16 - 03:43:13	852
Ellensburg	03:33:15	-23.4	Dark	Down	42.4	139.7	Up	03:23:17 - 03:43:14	809
Yakima	03:33:15	-23.4	Dark	Down	42.7	139.4	Up	03:23:17 - 03:43:14	772
Toppenish/White Swan	03:33:15	-23.6	Dark	Down	42.9	139.5	Up	03:23:16 - 03:43:13	755
PNWRO	03:33:10	-24.6	Dark	Down	43.9	141.1	Up	03:23:11 - 03:43:08	752
The Dalles	03:33:18	-23.1	Dark	Down	43.2	138.1	Up	03:23:19 - 03:43:16	667
Maupin	03:33:17	-23.2	Dark	Down	43.5	137.9	Up	03:23:18 - 03:43:15	630
Dunrhomin	03:32:15	-35.2	Dark	Down	53.9	156.6	Up	03:22:17 - 03:42:14	557
Nikitin	03:32:15	-35.2	Dark	Down	54.0	156.5	Up	03:22:17 - 03:42:14	539
Sisters	03:33:19	-22.8	Dark	Down	43.9	136.8	Up	03:23:21 - 03:43:18	537
CU-SBO	03:32:16	-35.2	Dark	Down	54.1	156.4	Up	03:22:17 - 03:42:14	531
Bend	03:33:19	-23.0	Dark	Down	44.2	136.9	Up	03:23:20 - 03:43:17	520
Oregon Observatory	03:33:19	-23.0	Dark	Down	44.3	136.7	Up	03:23:20 - 03:43:17	501
Chiloquin	03:33:21	-22.7	Dark	Down	45.0	135.3	Up	03:23:22 - 03:43:19	366
Klamath Falls	03:33:21	-22.8	Dark	Down	45.3	135.1	Up	03:23:22 - 03:43:19	335
Cedarville	03:33:15	-24.0	Dark	Down	46.6	136.6	Up	03:23:16 - 03:43:13	303
Fall River/Burney	03:33:19	-23.1	Dark	Down	46.4	134.7	Up	03:23:21 - 03:43:18	229
Gimple	03:33:18	-23.5	Dark	Down	47.3	134.7	Up	03:23:19 - 03:43:16	153
Greenville	03:33:18	-23.4	Dark	Down	47.2	134.6	Up	03:23:19 - 03:43:16	151
Quincy	03:33:18	-23.4	Dark	Down	47.4	134.4	Up	03:23:19 - 03:43:16	131
Portola	03:33:16	-23.8	Dark	Down	47.7	134.9	Up	03:23:17 - 03:43:14	130
Reno	03:33:13	-24.3	Dark	Down	48.3	135.5	Up	03:23:15 - 03:43:12	119
Carson City	03:33:13	-24.3	Dark	Down	48.5	135.2	Up	03:23:15 - 03:43:12	84
Yerington	03:33:11	-24.8	Dark	Down	49.0	135.9	Up	03:23:12 - 03:43:09	80
Gardnerville	03:33:13	-24.4	Dark	Down	48.7	135.1	Up	03:23:15 - 03:43:12	61
Hawthorne	03:33:09	-25.2	Dark	Down	49.6	136.2	Up	03:23:10 - 03:43:07	46
Lee Vining	03:33:10	-24.9	Dark	Down	49.8	135.1	Up	03:23:12 - 03:43:09	-21
Bishop	03:33:08	-25.4	Dark	Down	50.6	135.5	Up	03:23:09 - 03:43:06	-62
Beatty	03:33:01	-26.7	Dark	Down	51.8	137.2	Up	03:23:02 - 03:42:59	-68
Patrick	03:32:48	-29.1	Dark	Down	54.4	139.9	Up	03:22:50 - 03:42:47	-141
Laughlin/Bullhead City	03:32:51	-28.5	Dark	Down	54.2	138.6	Up	03:22:53 - 03:42:50	-184
Lake Havasu City	03:32:49	-28.8	Dark	Down	54.9	138.4	Up	03:22:51 - 03:42:48	-244
George/Scottsdale	03:32:39	-30.8	Dark	Down	56.8	141.2	Up	03:22:40 - 03:42:37	-254
Idyllwild	03:32:59	-26.8	Dark	Down	54.1	134.3	Up	03:23:01 - 03:42:58	-382
Wildwood	03:33:07	-25.3	Dark	Down	52.7	132.2	Up	03:23:09 - 03:43:06	-395
Calipatria	03:32:53	-27.8	Dark	Down	55.2	135.3	Up	03:22:55 - 03:42:52	-413
Yuma	03:32:50	-28.5	Dark	Down	56.0	136.1	Up	03:22:51 - 03:42:48	-433

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 55638, (2024/02/11 03:30UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 13.37 108
Alhena         06:37:42.8 +16:23:57  1.9 10.51 120
PPM 151081     06:41:59.3 +06:20:44  6.2  1.70 120
PPM 151280     06:48:24.0 +06:12:47  8.4  0.11 121
55638          06:48:49.9 +06:15:06 16.1       121
Positions are for J2000

Event circumstances last updated at 2023/12/06 05:56:58 UT

RECON