RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star GA0960:02303330 with event index number of 2249839

Geocentric closest approach at 2024/01/01 06:34:20 UTC

J2000 position of star is 06:52:49.0 +06:03:19
Equinox of date position of star is 06:54:05.9 +06:01:28
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 58 degrees from the moon. Moon is 76% illuminated.
Apparent brightness V=20.5

[RECON map]
Object is 31.2 AU from the Sun and 30.2 AU from the Earth.
Apparent velocity is 24.5 km/sec on the sky relative to the star, or, 4.0 arcsec/hr.
The 1-sigma error in the time of the event is 99 seconds.
The 1-sigma cross-track error in the shadow position is 1137 km.
The sky-plane scale is 21915.8 km/arcsec.

The object has an absolute magnitude Hv=5.6
Diameter=524.8 km assuming a 5% albedo -- 18.8 sec chord
Diameter=214.3 km assuming a 30% albedo -- 7.7 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2024/01/01 06:34UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:28.3 +07:24:34  0.4 14.37  72
Alhena         06:39:05.9 +16:22:36  1.9 10.98  61
PPM 151677     07:00:37.9 +07:16:56  6.1  2.05  57
PPM 151373     06:52:16.5 +05:48:44  7.4  0.50  59
PPM 151447     06:54:11.9 +05:51:47  9.3  0.16  58
55638          06:54:06.1 +06:01:28 16.7        58
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 30.9 km RECON observability=1.0 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	06:35:01	-60.3	Dark	Up	43.2	166.4	Up	06:26:15 - 06:43:46	4283
Kamloops	06:35:41	-57.4	Dark	Up	41.0	147.3	Up	06:26:56 - 06:44:27	4138
Kelowna	06:35:40	-58.4	Dark	Up	42.0	148.0	Up	06:26:54 - 06:44:25	4073
Peachland	06:35:40	-58.4	Dark	Up	42.0	147.6	Up	06:26:55 - 06:44:26	4063
Summerland	06:35:41	-58.5	Dark	Up	42.2	147.6	Up	06:26:55 - 06:44:26	4051
Penticton	06:35:41	-58.6	Dark	Up	42.3	147.7	Up	06:26:55 - 06:44:26	4046
Oliver	06:35:41	-58.9	Dark	Up	42.6	147.6	Up	06:26:55 - 06:44:26	4017
Anarchist Mountain Observatory	06:35:41	-59.1	Dark	Up	42.8	147.7	Up	06:26:55 - 06:44:26	4003
Victoria	06:35:52	-57.6	Dark	Up	41.7	142.5	Up	06:27:07 - 06:44:38	3958
Okanogan	06:35:42	-59.5	Dark	Up	43.2	147.1	Up	06:26:56 - 06:44:27	3949
Brewster	06:35:43	-59.6	Dark	Up	43.4	146.7	Up	06:26:57 - 06:44:28	3926
Manson/Chelan	06:35:44	-59.6	Dark	Up	43.4	146.1	Up	06:26:59 - 06:44:30	3908
Wenatchee	06:35:45	-59.9	Dark	Up	43.8	145.7	Up	06:26:59 - 06:44:30	3868
Ellensburg	06:35:46	-60.0	Dark	Up	44.0	145.2	Up	06:27:00 - 06:44:31	3832
Yakima	06:35:47	-60.3	Dark	Up	44.3	144.9	Up	06:27:01 - 06:44:32	3797
Toppenish/White Swan	06:35:46	-60.6	Dark	Up	44.6	145.0	Up	06:27:01 - 06:44:32	3779
PNWRO	06:35:42	-61.5	Dark	Up	45.5	146.7	Up	06:26:57 - 06:44:28	3750
The Dalles	06:35:49	-60.7	Dark	Up	44.9	143.6	Up	06:27:04 - 06:44:35	3711
Maupin	06:35:50	-61.0	Dark	Up	45.3	143.5	Up	06:27:04 - 06:44:35	3674
Sisters	06:35:52	-61.4	Dark	Up	45.8	142.3	Up	06:27:07 - 06:44:38	3597
Bend	06:35:52	-61.7	Dark	Up	46.1	142.5	Up	06:27:06 - 06:44:37	3576
Oregon Observatory	06:35:52	-61.7	Dark	Up	46.2	142.2	Up	06:27:07 - 06:44:38	3560
Chiloquin	06:35:55	-62.3	Dark	Up	47.0	140.8	Up	06:27:09 - 06:44:40	3442
Klamath Falls	06:35:55	-62.6	Dark	Up	47.3	140.7	Up	06:27:10 - 06:44:41	3411
Cedarville	06:35:50	-63.9	Dark	Up	48.6	142.3	Up	06:27:05 - 06:44:36	3350
Fall River/Burney	06:35:55	-63.5	Dark	Up	48.4	140.4	Up	06:27:10 - 06:44:41	3303
Dunrhomin	06:35:03	-71.7	Dark	Up	54.8	164.0	Up	06:26:18 - 06:43:49	3275
Nikitin	06:35:03	-71.9	Dark	Up	55.0	163.9	Up	06:26:17 - 06:43:48	3258
CU-SBO	06:35:03	-71.9	Dark	Up	55.0	163.7	Up	06:26:18 - 06:43:49	3252
Greenville	06:35:55	-64.3	Dark	Up	49.3	140.3	Up	06:27:09 - 06:44:40	3220
Gimple	06:35:54	-64.3	Dark	Up	49.4	140.4	Up	06:27:09 - 06:44:40	3220
Quincy	06:35:55	-64.4	Dark	Up	49.5	140.2	Up	06:27:09 - 06:44:40	3201
Portola	06:35:53	-64.8	Dark	Up	49.8	140.7	Up	06:27:08 - 06:44:39	3190
Reno	06:35:51	-65.3	Dark	Up	50.3	141.4	Up	06:27:06 - 06:44:37	3166
Carson City	06:35:52	-65.5	Dark	Up	50.6	141.1	Up	06:27:06 - 06:44:37	3133
Yerington	06:35:50	-66.1	Dark	Up	51.1	141.8	Up	06:27:04 - 06:44:35	3115
Gardnerville	06:35:52	-65.7	Dark	Up	50.8	141.0	Up	06:27:06 - 06:44:37	3110
Hawthorne	06:35:49	-66.7	Dark	Up	51.7	142.2	Up	06:27:03 - 06:44:34	3072
Lee Vining	06:35:51	-66.7	Dark	Up	51.9	141.1	Up	06:27:05 - 06:44:36	3018
Bishop	06:35:48	-67.5	Dark	Up	52.7	141.6	Up	06:27:03 - 06:44:34	2962
Beatty	06:35:44	-68.8	Dark	Up	53.9	143.6	Up	06:26:58 - 06:44:29	2921
Patrick	06:35:30	-71.5	Dark	Up	56.4	146.7	Up	06:26:44 - 06:44:15	2787
Laughlin/Bullhead City	06:35:30	-71.2	Dark	Up	56.3	145.4	Up	06:26:44 - 06:44:15	2764
Lake Havasu City	06:35:30	-71.8	Dark	Up	57.0	145.2	Up	06:26:44 - 06:44:15	2698
Wildwood	06:35:52	-69.0	Dark	Up	55.1	138.5	Up	06:27:06 - 06:44:37	2643
George/Scottsdale	06:35:28	-73.9	Dark	Up	58.7	148.7	Up	06:26:43 - 06:44:14	2624
Idyllwild	06:35:46	-70.5	Dark	Up	56.4	140.9	Up	06:27:00 - 06:44:31	2612
Calipatria	06:35:41	-71.7	Dark	Up	57.5	142.1	Up	06:26:56 - 06:44:27	2554
Yuma	06:35:30	-72.5	Dark	Up	58.3	143.1	Up	06:26:44 - 06:44:15	2523

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, (2024/01/01 06:34UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 14.37  72
Alhena         06:37:42.8 +16:23:57  1.9 10.98  61
PPM 151677     06:59:20.1 +07:19:00  6.1  2.05  57
PPM 151373     06:50:59.5 +05:50:32  7.4  0.50  59
PPM 151447     06:52:54.9 +05:53:38  9.3  0.16  58
55638          06:52:49.0 +06:03:19 16.7        58
Positions are for J2000

Event circumstances last updated at 2023/12/06 05:56:08 UT

RECON