RECON: TNO occultation with 559176

Event between (559176) 15BE518 and star GA0760:04777489 with event index number of 2643824

Geocentric closest approach at 2026/03/21 08:16:34 UTC

J2000 position of star is 13:17:54.6 -12:32:12
Equinox of date position of star is 13:19:12.3 -12:39:54
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 172 degrees from the moon. Moon is 7% illuminated.
Apparent brightness V=20.8

[RECON map]
Object is 16.8 AU from the Sun and 15.9 AU from the Earth.
Apparent velocity is 19.4 km/sec on the sky relative to the star, or, 6.1 arcsec/hr.
The 1-sigma error in the time of the event is 49 seconds.
The 1-sigma cross-track error in the shadow position is 845 km.
The sky-plane scale is 11541.6 km/arcsec.

The object has an absolute magnitude Hv=8.5
Diameter=119.1 km assuming a 5% albedo -- 6.3 sec chord
Diameter=48.6 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is CENTAURR

Star training set for 559176, (2026/03/21 08:18UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:34.7 -11:17:50  1.0  2.25 173
68 Vir         13:28:06.6 -12:50:36  5.3  2.16 174
PPM 227063     13:18:35.2 -12:39:50  8.3  0.17 172
559176         13:19:17.9 -12:40:27 16.4       172
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 17.5 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)

Sleaford 08:17:46 -35.8 Dark Down 25.4 177.7 Low 08:13:09 - 08:22:23 6970

Kamloops 08:18:35 -39.0 Dark Down 25.2 162.3 Low 08:13:58 - 08:23:12 6652

Kelowna 08:18:32 -39.8 Dark Down 26.1 163.2 Low 08:13:55 - 08:23:09 6624

Peachland 08:18:33 -39.9 Dark Down 26.2 162.8 Low 08:13:56 - 08:23:10 6612

Summerland 08:18:32 -40.0 Dark Down 26.4 162.9 Low 08:13:55 - 08:23:09 6606

Penticton 08:18:32 -40.1 Dark Down 26.4 163.0 Low 08:13:55 - 08:23:09 6604

Oliver 08:18:32 -40.4 Dark Down 26.8 163.0 Low 08:13:55 - 08:23:09 6584

Anarchist Mountain Observatory 08:18:32 -40.6 Dark Down 27.0 163.2 Low 08:13:55 - 08:23:09 6578

Okanogan 08:18:33 -41.3 Dark Down 27.6 162.8 Low 08:13:56 - 08:23:10 6536

Brewster 08:18:34 -41.5 Dark Down 27.8 162.6 Low 08:13:57 - 08:23:11 6517

Manson/Chelan 08:18:35 -41.8 Dark Down 27.9 162.1 Low 08:13:58 - 08:23:12 6497

Victoria 08:18:46 -41.2 Dark Down 26.6 158.8 Low 08:14:09 - 08:23:23 6470

Wenatchee 08:18:36 -42.3 Dark Down 28.3 161.9 Low 08:13:59 - 08:23:13 6465

Ellensburg 08:18:37 -42.7 Dark Down 28.7 161.6 Low 08:14:00 - 08:23:14 6436

Yakima 08:18:38 -43.1 Dark Down 29.0 161.5 Low 08:14:01 - 08:23:15 6411

PNWRO 08:18:31 -43.6 Dark Down 29.9 163.2 Low 08:13:54 - 08:23:08 6409

Toppenish/White Swan 08:18:37 -43.3 Dark Down 29.3 161.6 Low 08:14:00 - 08:23:14 6401

The Dalles 08:18:40 -44.1 Dark Down 29.8 160.6 Low 08:14:03 - 08:23:17 6336

Dunrhomin 08:17:37 -46.5 Dark Down 37.2 178.3 Up 08:13:00 - 08:22:14 6312

Maupin 08:18:40 -44.5 Dark Down 30.3 160.7 Up 08:14:03 - 08:23:17 6312

Nikitin 08:17:36 -46.6 Dark Down 37.4 178.3 Up 08:12:59 - 08:22:13 6300

CU-SBO 08:17:38 -46.7 Dark Down 37.4 178.2 Up 08:13:01 - 08:22:15 6294

Sisters 08:18:42 -45.4 Dark Down 31.0 160.0 Up 08:14:05 - 08:23:19 6246

Bend 08:18:41 -45.6 Dark Down 31.3 160.2 Up 08:14:04 - 08:23:18 6236

Oregon Observatory 08:18:42 -45.8 Dark Down 31.4 160.0 Up 08:14:05 - 08:23:19 6222

Chiloquin 08:18:44 -47.1 Dark Down 32.5 159.3 Up 08:14:07 - 08:23:21 6125

Klamath Falls 08:18:44 -47.5 Dark Down 32.9 159.3 Up 08:14:07 - 08:23:21 6103

Cedarville 08:18:38 -48.1 Dark Down 33.9 160.9 Up 08:14:01 - 08:23:15 6091

Fall River/Burney 08:18:43 -48.6 Dark Down 34.1 159.5 Up 08:14:06 - 08:23:20 6031

Gimple 08:18:41 -49.5 Dark Down 35.1 159.8 Up 08:14:04 - 08:23:18 5979

Greenville 08:18:41 -49.5 Dark Down 35.0 159.7 Up 08:14:04 - 08:23:18 5977

Portola 08:18:40 -49.8 Dark Down 35.5 160.2 Up 08:14:03 - 08:23:17 5965

Quincy 08:18:42 -49.7 Dark Down 35.2 159.7 Up 08:14:05 - 08:23:19 5963

Reno 08:18:37 -50.1 Dark Down 35.9 160.9 Up 08:14:00 - 08:23:14 5961

Yerington 08:18:34 -50.6 Dark Down 36.6 161.5 Up 08:13:57 - 08:23:11 5936

Carson City 08:18:37 -50.4 Dark Down 36.2 160.8 Up 08:14:00 - 08:23:14 5936

Gardnerville 08:18:38 -50.7 Dark Down 36.5 160.8 Up 08:14:01 - 08:23:15 5919

Hawthorne 08:18:32 -51.0 Dark Down 37.1 162.0 Up 08:13:55 - 08:23:09 5914

Lee Vining 08:18:34 -51.6 Dark Down 37.6 161.3 Up 08:13:57 - 08:23:11 5863

Beatty 08:18:25 -52.4 Dark Down 39.1 163.9 Up 08:13:48 - 08:23:02 5838

Bishop 08:18:31 -52.1 Dark Down 38.3 162.0 Up 08:13:54 - 08:23:08 5835

Patrick 08:18:12 -53.3 Dark Down 41.1 167.1 Up 08:13:35 - 08:22:49 5792

Laughlin/Bullhead City 08:18:15 -53.7 Dark Down 41.2 166.2 Up 08:13:38 - 08:22:52 5757

Lake Havasu City 08:18:14 -54.3 Dark Down 41.9 166.3 Up 08:13:37 - 08:22:51 5712

George/Scottsdale 08:18:02 -54.5 Dark Down 43.1 169.3 Up 08:13:25 - 08:22:39 5708

Idyllwild 08:18:24 -55.5 Dark Down 42.2 163.1 Up 08:13:47 - 08:23:01 5599

Wildwood 08:18:32 -55.4 Dark Down 41.4 160.9 Up 08:13:55 - 08:23:09 5581

Calipatria 08:18:18 -55.9 Dark Down 43.0 164.5 Up 08:13:41 - 08:22:55 5578

Yuma 08:18:15 -56.1 Dark Down 43.6 165.5 Up 08:13:38 - 08:22:52 5565

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 559176, (2026/03/21 08:18UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0  2.25 173
68 Vir         13:26:43.0 -12:42:28  5.3  2.16 174
PPM 227063     13:17:12.0 -12:31:35  8.3  0.17 172
559176         13:17:54.6 -12:32:12 16.4       172
Positions are for J2000

Event circumstances last updated at 2024/06/18 21:25:54 UT

Marc W. Buie, Southwest Research Institute

RECON

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Sleaford	08:17:46	-35.8	Dark	Down	25.4	177.7	Low	08:13:09 - 08:22:23	6970
Kamloops	08:18:35	-39.0	Dark	Down	25.2	162.3	Low	08:13:58 - 08:23:12	6652
Kelowna	08:18:32	-39.8	Dark	Down	26.1	163.2	Low	08:13:55 - 08:23:09	6624
Peachland	08:18:33	-39.9	Dark	Down	26.2	162.8	Low	08:13:56 - 08:23:10	6612
Summerland	08:18:32	-40.0	Dark	Down	26.4	162.9	Low	08:13:55 - 08:23:09	6606
Penticton	08:18:32	-40.1	Dark	Down	26.4	163.0	Low	08:13:55 - 08:23:09	6604
Oliver	08:18:32	-40.4	Dark	Down	26.8	163.0	Low	08:13:55 - 08:23:09	6584
Anarchist Mountain Observatory	08:18:32	-40.6	Dark	Down	27.0	163.2	Low	08:13:55 - 08:23:09	6578
Okanogan	08:18:33	-41.3	Dark	Down	27.6	162.8	Low	08:13:56 - 08:23:10	6536
Brewster	08:18:34	-41.5	Dark	Down	27.8	162.6	Low	08:13:57 - 08:23:11	6517
Manson/Chelan	08:18:35	-41.8	Dark	Down	27.9	162.1	Low	08:13:58 - 08:23:12	6497
Victoria	08:18:46	-41.2	Dark	Down	26.6	158.8	Low	08:14:09 - 08:23:23	6470
Wenatchee	08:18:36	-42.3	Dark	Down	28.3	161.9	Low	08:13:59 - 08:23:13	6465
Ellensburg	08:18:37	-42.7	Dark	Down	28.7	161.6	Low	08:14:00 - 08:23:14	6436
Yakima	08:18:38	-43.1	Dark	Down	29.0	161.5	Low	08:14:01 - 08:23:15	6411
PNWRO	08:18:31	-43.6	Dark	Down	29.9	163.2	Low	08:13:54 - 08:23:08	6409
Toppenish/White Swan	08:18:37	-43.3	Dark	Down	29.3	161.6	Low	08:14:00 - 08:23:14	6401
The Dalles	08:18:40	-44.1	Dark	Down	29.8	160.6	Low	08:14:03 - 08:23:17	6336
Dunrhomin	08:17:37	-46.5	Dark	Down	37.2	178.3	Up	08:13:00 - 08:22:14	6312
Maupin	08:18:40	-44.5	Dark	Down	30.3	160.7	Up	08:14:03 - 08:23:17	6312
Nikitin	08:17:36	-46.6	Dark	Down	37.4	178.3	Up	08:12:59 - 08:22:13	6300
CU-SBO	08:17:38	-46.7	Dark	Down	37.4	178.2	Up	08:13:01 - 08:22:15	6294
Sisters	08:18:42	-45.4	Dark	Down	31.0	160.0	Up	08:14:05 - 08:23:19	6246
Bend	08:18:41	-45.6	Dark	Down	31.3	160.2	Up	08:14:04 - 08:23:18	6236
Oregon Observatory	08:18:42	-45.8	Dark	Down	31.4	160.0	Up	08:14:05 - 08:23:19	6222
Chiloquin	08:18:44	-47.1	Dark	Down	32.5	159.3	Up	08:14:07 - 08:23:21	6125
Klamath Falls	08:18:44	-47.5	Dark	Down	32.9	159.3	Up	08:14:07 - 08:23:21	6103
Cedarville	08:18:38	-48.1	Dark	Down	33.9	160.9	Up	08:14:01 - 08:23:15	6091
Fall River/Burney	08:18:43	-48.6	Dark	Down	34.1	159.5	Up	08:14:06 - 08:23:20	6031
Gimple	08:18:41	-49.5	Dark	Down	35.1	159.8	Up	08:14:04 - 08:23:18	5979
Greenville	08:18:41	-49.5	Dark	Down	35.0	159.7	Up	08:14:04 - 08:23:18	5977
Portola	08:18:40	-49.8	Dark	Down	35.5	160.2	Up	08:14:03 - 08:23:17	5965
Quincy	08:18:42	-49.7	Dark	Down	35.2	159.7	Up	08:14:05 - 08:23:19	5963
Reno	08:18:37	-50.1	Dark	Down	35.9	160.9	Up	08:14:00 - 08:23:14	5961
Yerington	08:18:34	-50.6	Dark	Down	36.6	161.5	Up	08:13:57 - 08:23:11	5936
Carson City	08:18:37	-50.4	Dark	Down	36.2	160.8	Up	08:14:00 - 08:23:14	5936
Gardnerville	08:18:38	-50.7	Dark	Down	36.5	160.8	Up	08:14:01 - 08:23:15	5919
Hawthorne	08:18:32	-51.0	Dark	Down	37.1	162.0	Up	08:13:55 - 08:23:09	5914
Lee Vining	08:18:34	-51.6	Dark	Down	37.6	161.3	Up	08:13:57 - 08:23:11	5863
Beatty	08:18:25	-52.4	Dark	Down	39.1	163.9	Up	08:13:48 - 08:23:02	5838
Bishop	08:18:31	-52.1	Dark	Down	38.3	162.0	Up	08:13:54 - 08:23:08	5835
Patrick	08:18:12	-53.3	Dark	Down	41.1	167.1	Up	08:13:35 - 08:22:49	5792
Laughlin/Bullhead City	08:18:15	-53.7	Dark	Down	41.2	166.2	Up	08:13:38 - 08:22:52	5757
Lake Havasu City	08:18:14	-54.3	Dark	Down	41.9	166.3	Up	08:13:37 - 08:22:51	5712
George/Scottsdale	08:18:02	-54.5	Dark	Down	43.1	169.3	Up	08:13:25 - 08:22:39	5708
Idyllwild	08:18:24	-55.5	Dark	Down	42.2	163.1	Up	08:13:47 - 08:23:01	5599
Wildwood	08:18:32	-55.4	Dark	Down	41.4	160.9	Up	08:13:55 - 08:23:09	5581
Calipatria	08:18:18	-55.9	Dark	Down	43.0	164.5	Up	08:13:41 - 08:22:55	5578
Yuma	08:18:15	-56.1	Dark	Down	43.6	165.5	Up	08:13:38 - 08:22:52	5565