RECON: TNO occultation with 506439

Event between (506439) 00YB2 and star GA1100:02017145 with event index number of 2258422

Geocentric closest approach at 2026/12/17 03:41:24 UTC

J2000 position of star is 06:23:56.5 +20:47:22
Equinox of date position of star is 06:25:24.1 +20:46:30
Stellar brightness G=16.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 102 degrees from the moon. Moon is 49% illuminated.
Apparent brightness V=23.0

[RECON map]
Object is 39.2 AU from the Sun and 38.3 AU from the Earth.
Apparent velocity is 25.0 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 749 seconds.
The 1-sigma cross-track error in the shadow position is 1474 km.
The sky-plane scale is 27745.6 km/arcsec.

The object has an absolute magnitude Hv=7.1
Diameter=275.4 km assuming a 5% albedo -- 9.0 sec chord
Diameter=112.4 km assuming a 30% albedo -- 3.7 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 506439, (2026/12/17 03:41UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:37.9 +07:24:35  0.4 15.08  95
Alhena         06:39:16.1 +16:22:26  1.9  5.47 105
16 Gem         06:29:32.9 +20:28:39  6.1  0.98 102
PPM 122405     06:25:37.6 +19:53:33  8.5  0.88 102
PPM 095854     06:23:59.7 +20:51:41  9.4  0.37 101
506439         06:25:33.0 +20:46:24 16.3       102
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 1.2 sigma about the mid-time.
The median site spacing is 24.5 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)
Kamloops	03:44:09	-34.6	Dark	Up	25.6	88.0	Low	03:29:09 - 03:59:09	4861
Kelowna	03:44:11	-35.3	Dark	Up	26.2	88.3	Low	03:29:11 - 03:59:11	4776
Peachland	03:44:11	-35.1	Dark	Up	26.0	88.0	Low	03:29:11 - 03:59:11	4775
Victoria	03:44:18	-32.8	Dark	Up	23.6	84.7	Low	03:29:18 - 03:59:18	4766
Summerland	03:44:12	-35.1	Dark	Up	26.1	88.0	Low	03:29:12 - 03:59:12	4761
Penticton	03:44:12	-35.2	Dark	Up	26.1	88.0	Low	03:29:12 - 03:59:12	4753
Oliver	03:44:13	-35.3	Dark	Up	26.1	87.9	Low	03:29:13 - 03:59:13	4725
Anarchist Mountain Observatory	03:44:13	-35.4	Dark	Up	26.2	87.9	Low	03:29:13 - 03:59:13	4706
Sleaford	03:43:49	-43.1	Dark	Up	34.5	100.4	Up	03:28:49 - 03:58:49	4664
Okanogan	03:44:16	-35.3	Dark	Up	26.1	87.5	Low	03:29:16 - 03:59:16	4659
Brewster	03:44:17	-35.2	Dark	Up	25.9	87.2	Low	03:29:17 - 03:59:17	4642
Manson/Chelan	03:44:17	-35.0	Dark	Up	25.7	86.8	Low	03:29:17 - 03:59:17	4635
Wenatchee	03:44:19	-34.9	Dark	Up	25.5	86.5	Low	03:29:19 - 03:59:19	4600
Ellensburg	03:44:21	-34.7	Dark	Up	25.4	86.1	Low	03:29:21 - 03:59:21	4572
Yakima	03:44:22	-34.7	Dark	Up	25.3	85.9	Low	03:29:22 - 03:59:22	4539
Toppenish/White Swan	03:44:22	-34.9	Dark	Up	25.4	85.9	Low	03:29:22 - 03:59:22	4516
The Dalles	03:44:25	-34.3	Dark	Up	24.8	85.0	Low	03:29:25 - 03:59:25	4472
PNWRO	03:44:22	-35.9	Dark	Up	26.4	86.8	Low	03:29:22 - 03:59:22	4448
Maupin	03:44:26	-34.4	Dark	Up	24.9	84.9	Low	03:29:26 - 03:59:26	4434
Sisters	03:44:29	-34.1	Dark	Up	24.4	84.2	Low	03:29:29 - 03:59:29	4374
Bend	03:44:29	-34.3	Dark	Up	24.6	84.3	Low	03:29:29 - 03:59:29	4347
Oregon Observatory	03:44:30	-34.2	Dark	Up	24.5	84.1	Low	03:29:30 - 03:59:30	4335
Chiloquin	03:44:34	-33.9	Dark	Up	24.1	83.2	Low	03:29:34 - 03:59:34	4234
Klamath Falls	03:44:35	-33.9	Dark	Up	24.1	83.1	Low	03:29:35 - 03:59:35	4202
Cedarville	03:44:36	-35.1	Dark	Up	25.2	83.8	Low	03:29:36 - 03:59:36	4097
Fall River/Burney	03:44:38	-34.2	Dark	Up	24.2	82.9	Low	03:29:38 - 03:59:38	4088
Greenville	03:44:39	-34.5	Dark	Up	24.5	82.7	Low	03:29:39 - 03:59:39	3996
Gimple	03:44:40	-34.5	Dark	Up	24.5	82.8	Low	03:29:40 - 03:59:40	3993
Quincy	03:44:40	-34.4	Dark	Up	24.4	82.6	Low	03:29:40 - 03:59:40	3977
Portola	03:44:40	-34.8	Dark	Up	24.8	82.9	Low	03:29:40 - 03:59:40	3953
Reno	03:44:40	-35.3	Dark	Up	25.2	83.1	Low	03:29:40 - 03:59:40	3910
Carson City	03:44:41	-35.3	Dark	Up	25.2	83.0	Low	03:29:41 - 03:59:41	3877
Gardnerville	03:44:42	-35.3	Dark	Up	25.2	82.9	Low	03:29:42 - 03:59:42	3854
Yerington	03:44:41	-35.8	Dark	Up	25.7	83.3	Low	03:29:41 - 03:59:41	3842
Hawthorne	03:44:42	-36.2	Dark	Up	26.1	83.4	Low	03:29:42 - 03:59:42	3784
Lee Vining	03:44:43	-35.8	Dark	Up	25.6	82.8	Low	03:29:43 - 03:59:43	3747
Bishop	03:44:44	-36.3	Dark	Up	26.1	82.9	Low	03:29:44 - 03:59:44	3671
Dunrhomin	03:44:19	-46.4	Dark	Up	36.4	92.7	Up	03:29:19 - 03:59:19	3592
Beatty	03:44:43	-37.6	Dark	Up	27.3	83.6	Low	03:29:43 - 03:59:43	3581
Nikitin	03:44:19	-46.4	Dark	Up	36.4	92.5	Up	03:29:19 - 03:59:19	3575
CU-SBO	03:44:19	-46.4	Dark	Up	36.4	92.4	Up	03:29:19 - 03:59:19	3571
Wildwood	03:44:52	-35.9	Dark	Up	25.5	81.3	Low	03:29:52 - 03:59:52	3369
Patrick	03:44:43	-39.9	Dark	Up	29.5	84.4	Low	03:29:43 - 03:59:43	3357
Laughlin/Bullhead City	03:44:44	-39.3	Dark	Up	28.9	83.9	Low	03:29:44 - 03:59:44	3354
Lake Havasu City	03:44:46	-39.4	Dark	Up	29.1	83.6	Low	03:29:46 - 03:59:46	3282
Idyllwild	03:44:50	-37.4	Dark	Up	27.0	82.0	Low	03:29:50 - 03:59:50	3279
Calipatria	03:44:50	-38.4	Dark	Up	27.9	82.3	Low	03:29:50 - 03:59:50	3185
George/Scottsdale	03:44:44	-41.4	Dark	Up	31.0	84.4	Up	03:29:44 - 03:59:44	3136
Yuma	03:44:50	-39.1	Dark	Up	28.6	82.5	Low	03:29:50 - 03:59:50	3116

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 506439, (2026/12/17 03:41UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 15.08  95
Alhena         06:37:42.8 +16:23:57  1.9  5.47 105
16 Gem         06:27:56.7 +20:29:46  6.1  0.98 102
PPM 122405     06:24:01.8 +19:54:32  8.5  0.88 102
PPM 095854     06:22:23.1 +20:52:35  9.4  0.37 101
506439         06:23:56.5 +20:47:22 16.3       101
Positions are for J2000

Event circumstances last updated at 2024/06/20 21:26:02 UT

RECON