RECON: TNO occultation with 50000

Event between (50000) Quaoar and star GA0740:21237812 with event index number of 2327135

Geocentric closest approach at 2025/11/01 02:12:28 UTC

J2000 position of star is 18:38:00.5 -15:14:02
Equinox of date position of star is 18:39:23.5 -15:12:41
Stellar brightness G=15.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 59 degrees from the moon. Moon is 74% illuminated.
Apparent brightness V=18.9

[RECON map]
Object is 42.6 AU from the Sun and 43.1 AU from the Earth.
Apparent velocity is 20.0 km/sec on the sky relative to the star, or, 2.3 arcsec/hr.
The 1-sigma error in the time of the event is 111 seconds.
The 1-sigma cross-track error in the shadow position is 1570 km.
The sky-plane scale is 31262.6 km/arcsec.

The object has an absolute magnitude Hv=2.4
Diameter=1905.5 km assuming a 5% albedo -- 98.9 sec chord
Diameter=777.9 km assuming a 30% albedo -- 40.4 sec chord
Dynamical classification is CLASSICAL

Star training set for 50000, (2025/11/01 02:13UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:59.7 -26:29:13  0.9 31.95  88
Nunki          18:56:51.9 -26:15:44  2.0 11.77  56
PPM 234707     18:35:07.6 -14:49:56  6.1  1.12  60
PPM 234797     18:38:37.7 -15:00:10  7.9  0.29  60
PPM 234811     18:39:12.5 -15:24:12  8.9  0.20  59
50000          18:39:29.2 -15:12:35 15.6        59
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 32.6 km RECON observability=0.4 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 02:13:49 -15.7 AT Up 17.6 214.7 Really Low 02:04:03 - 02:23:36 -621

Sleaford 02:14:24 -24.7 Dark Up 10.6 227.6 Really Low 02:04:37 - 02:24:10 -649

Kelowna 02:13:54 -16.2 AT Up 17.9 215.7 Really Low 02:04:08 - 02:23:41 -661

Peachland 02:13:54 -16.0 AT Up 18.1 215.4 Really Low 02:04:07 - 02:23:40 -664

Summerland 02:13:55 -16.1 AT Up 18.2 215.6 Really Low 02:04:08 - 02:23:41 -672

Penticton 02:13:55 -16.1 AT Up 18.2 215.7 Really Low 02:04:08 - 02:23:41 -675

Oliver 02:13:56 -16.1 AT Up 18.5 215.8 Really Low 02:04:09 - 02:23:42 -691

Anarchist Mountain Observatory 02:13:57 -16.2 AT Up 18.6 216.0 Really Low 02:04:10 - 02:23:43 -700

Victoria 02:13:45 -13.5 AT Up 20.5 212.2 Low 02:03:59 - 02:23:32 -709

Okanogan 02:13:58 -16.0 AT Up 19.2 215.9 Really Low 02:04:11 - 02:23:44 -730

Brewster 02:13:58 -15.9 AT Up 19.5 215.8 Really Low 02:04:11 - 02:23:44 -742

Manson/Chelan 02:13:57 -15.6 AT Up 19.8 215.5 Really Low 02:04:11 - 02:23:44 -750

Wenatchee 02:13:58 -15.5 AT Up 20.2 215.4 Low 02:04:11 - 02:23:44 -773

Ellensburg 02:13:58 -15.3 AT Up 20.7 215.3 Low 02:04:12 - 02:23:45 -793

Yakima 02:13:59 -15.2 AT Up 21.0 215.4 Low 02:04:13 - 02:23:46 -813

Toppenish/White Swan 02:14:00 -15.3 AT Up 21.1 215.6 Low 02:04:14 - 02:23:47 -825

PNWRO 02:14:07 -16.4 AT Up 20.8 217.1 Low 02:04:20 - 02:23:53 -851

The Dalles 02:14:00 -14.7 AT Up 22.1 215.0 Low 02:04:13 - 02:23:46 -862

Maupin 02:14:01 -14.8 AT Up 22.4 215.2 Low 02:04:15 - 02:23:48 -885

Sisters 02:14:02 -14.3 AT Up 23.3 215.0 Low 02:04:15 - 02:23:48 -930

Bend 02:14:03 -14.5 AT Up 23.4 215.3 Low 02:04:17 - 02:23:50 -944

Oregon Observatory 02:14:03 -14.4 AT Up 23.6 215.2 Low 02:04:17 - 02:23:50 -953

Chiloquin 02:14:05 -13.9 AT Up 24.8 215.1 Low 02:04:19 - 02:23:52 -1025

Klamath Falls 02:14:06 -13.9 AT Up 25.1 215.3 Low 02:04:19 - 02:23:52 -1045

Cedarville 02:14:13 -15.1 AT Up 24.9 217.1 Low 02:04:27 - 02:24:00 -1093

Fall River/Burney 02:14:10 -14.1 AT Up 25.8 216.0 Low 02:04:24 - 02:23:57 -1117

Greenville 02:14:14 -14.3 AT Up 26.4 216.7 Low 02:04:28 - 02:24:01 -1174

Gimple 02:14:14 -14.4 AT Up 26.3 216.8 Low 02:04:28 - 02:24:01 -1174

Quincy 02:14:14 -14.3 AT Up 26.5 216.8 Low 02:04:28 - 02:24:01 -1186

Portola 02:14:16 -14.7 AT Up 26.4 217.3 Low 02:04:30 - 02:24:03 -1196

Reno 02:14:20 -15.1 AT Up 26.3 218.0 Low 02:04:33 - 02:24:06 -1216

Carson City 02:14:21 -15.1 AT Up 26.6 218.1 Low 02:04:34 - 02:24:07 -1238

Yerington 02:14:23 -15.6 AT Up 26.4 218.8 Low 02:04:37 - 02:24:10 -1254

Gardnerville 02:14:21 -15.1 AT Up 26.7 218.3 Low 02:04:35 - 02:24:08 -1254

Hawthorne 02:14:26 -16.0 AT Up 26.5 219.4 Low 02:04:40 - 02:24:13 -1287

Dunrhomin 02:15:05 -26.5 Dark Up 17.8 230.7 Really Low 02:05:19 - 02:24:52 -1288

Nikitin 02:15:06 -26.5 Dark Up 18.0 230.7 Really Low 02:05:19 - 02:24:52 -1300

CU-SBO 02:15:06 -26.5 Dark Up 18.0 230.6 Really Low 02:05:19 - 02:24:52 -1303

Lee Vining 02:14:26 -15.5 AT Up 27.2 219.2 Low 02:04:39 - 02:24:12 -1320

Bishop 02:14:30 -16.0 AT Up 27.3 220.1 Low 02:04:43 - 02:24:16 -1364

Beatty 02:14:37 -17.3 AT Up 26.7 221.7 Low 02:04:51 - 02:24:24 -1405

Patrick 02:14:51 -19.6 Dark Up 26.2 224.8 Low 02:05:05 - 02:24:38 -1527

Laughlin/Bullhead City 02:14:49 -19.0 Dark Up 26.8 224.3 Low 02:05:03 - 02:24:36 -1539

Wildwood 02:14:36 -15.5 AT Up 29.8 221.0 Low 02:04:50 - 02:24:23 -1587

Lake Havasu City 02:14:52 -19.1 Dark Up 27.1 224.8 Low 02:05:05 - 02:24:38 -1589

Idyllwild 02:14:44 -17.1 AT Up 29.0 222.9 Low 02:04:58 - 02:24:31 -1624

George/Scottsdale 02:15:02 -21.2 Dark Up 26.2 227.2 Low 02:05:16 - 02:24:49 -1665

Calipatria 02:14:51 -18.0 Dark Up 28.8 224.2 Low 02:05:04 - 02:24:37 -1678

Yuma 02:14:55 -18.7 Dark Up 28.6 225.2 Low 02:05:09 - 02:24:42 -1716

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 50000, (2025/11/01 02:13UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 31.95  88
Nunki          18:55:15.9 -26:17:49  2.0 11.77  56
PPM 234707     18:33:39.1 -14:51:14  6.1  1.12  60
PPM 234797     18:37:09.2 -15:01:35  7.9  0.29  60
PPM 234811     18:37:43.7 -15:25:38  8.9  0.20  59
50000          18:38:00.5 -15:14:02 15.6        59
Positions are for J2000

Event circumstances last updated at 2024/03/03 06:05:25 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)
Kamloops	02:13:49	-15.7	AT	Up	17.6	214.7	Really Low	02:04:03 - 02:23:36	-621
Sleaford	02:14:24	-24.7	Dark	Up	10.6	227.6	Really Low	02:04:37 - 02:24:10	-649
Kelowna	02:13:54	-16.2	AT	Up	17.9	215.7	Really Low	02:04:08 - 02:23:41	-661
Peachland	02:13:54	-16.0	AT	Up	18.1	215.4	Really Low	02:04:07 - 02:23:40	-664
Summerland	02:13:55	-16.1	AT	Up	18.2	215.6	Really Low	02:04:08 - 02:23:41	-672
Penticton	02:13:55	-16.1	AT	Up	18.2	215.7	Really Low	02:04:08 - 02:23:41	-675
Oliver	02:13:56	-16.1	AT	Up	18.5	215.8	Really Low	02:04:09 - 02:23:42	-691
Anarchist Mountain Observatory	02:13:57	-16.2	AT	Up	18.6	216.0	Really Low	02:04:10 - 02:23:43	-700
Victoria	02:13:45	-13.5	AT	Up	20.5	212.2	Low	02:03:59 - 02:23:32	-709
Okanogan	02:13:58	-16.0	AT	Up	19.2	215.9	Really Low	02:04:11 - 02:23:44	-730
Brewster	02:13:58	-15.9	AT	Up	19.5	215.8	Really Low	02:04:11 - 02:23:44	-742
Manson/Chelan	02:13:57	-15.6	AT	Up	19.8	215.5	Really Low	02:04:11 - 02:23:44	-750
Wenatchee	02:13:58	-15.5	AT	Up	20.2	215.4	Low	02:04:11 - 02:23:44	-773
Ellensburg	02:13:58	-15.3	AT	Up	20.7	215.3	Low	02:04:12 - 02:23:45	-793
Yakima	02:13:59	-15.2	AT	Up	21.0	215.4	Low	02:04:13 - 02:23:46	-813
Toppenish/White Swan	02:14:00	-15.3	AT	Up	21.1	215.6	Low	02:04:14 - 02:23:47	-825
PNWRO	02:14:07	-16.4	AT	Up	20.8	217.1	Low	02:04:20 - 02:23:53	-851
The Dalles	02:14:00	-14.7	AT	Up	22.1	215.0	Low	02:04:13 - 02:23:46	-862
Maupin	02:14:01	-14.8	AT	Up	22.4	215.2	Low	02:04:15 - 02:23:48	-885
Sisters	02:14:02	-14.3	AT	Up	23.3	215.0	Low	02:04:15 - 02:23:48	-930
Bend	02:14:03	-14.5	AT	Up	23.4	215.3	Low	02:04:17 - 02:23:50	-944
Oregon Observatory	02:14:03	-14.4	AT	Up	23.6	215.2	Low	02:04:17 - 02:23:50	-953
Chiloquin	02:14:05	-13.9	AT	Up	24.8	215.1	Low	02:04:19 - 02:23:52	-1025
Klamath Falls	02:14:06	-13.9	AT	Up	25.1	215.3	Low	02:04:19 - 02:23:52	-1045
Cedarville	02:14:13	-15.1	AT	Up	24.9	217.1	Low	02:04:27 - 02:24:00	-1093
Fall River/Burney	02:14:10	-14.1	AT	Up	25.8	216.0	Low	02:04:24 - 02:23:57	-1117
Greenville	02:14:14	-14.3	AT	Up	26.4	216.7	Low	02:04:28 - 02:24:01	-1174
Gimple	02:14:14	-14.4	AT	Up	26.3	216.8	Low	02:04:28 - 02:24:01	-1174
Quincy	02:14:14	-14.3	AT	Up	26.5	216.8	Low	02:04:28 - 02:24:01	-1186
Portola	02:14:16	-14.7	AT	Up	26.4	217.3	Low	02:04:30 - 02:24:03	-1196
Reno	02:14:20	-15.1	AT	Up	26.3	218.0	Low	02:04:33 - 02:24:06	-1216
Carson City	02:14:21	-15.1	AT	Up	26.6	218.1	Low	02:04:34 - 02:24:07	-1238
Yerington	02:14:23	-15.6	AT	Up	26.4	218.8	Low	02:04:37 - 02:24:10	-1254
Gardnerville	02:14:21	-15.1	AT	Up	26.7	218.3	Low	02:04:35 - 02:24:08	-1254
Hawthorne	02:14:26	-16.0	AT	Up	26.5	219.4	Low	02:04:40 - 02:24:13	-1287
Dunrhomin	02:15:05	-26.5	Dark	Up	17.8	230.7	Really Low	02:05:19 - 02:24:52	-1288
Nikitin	02:15:06	-26.5	Dark	Up	18.0	230.7	Really Low	02:05:19 - 02:24:52	-1300
CU-SBO	02:15:06	-26.5	Dark	Up	18.0	230.6	Really Low	02:05:19 - 02:24:52	-1303
Lee Vining	02:14:26	-15.5	AT	Up	27.2	219.2	Low	02:04:39 - 02:24:12	-1320
Bishop	02:14:30	-16.0	AT	Up	27.3	220.1	Low	02:04:43 - 02:24:16	-1364
Beatty	02:14:37	-17.3	AT	Up	26.7	221.7	Low	02:04:51 - 02:24:24	-1405
Patrick	02:14:51	-19.6	Dark	Up	26.2	224.8	Low	02:05:05 - 02:24:38	-1527
Laughlin/Bullhead City	02:14:49	-19.0	Dark	Up	26.8	224.3	Low	02:05:03 - 02:24:36	-1539
Wildwood	02:14:36	-15.5	AT	Up	29.8	221.0	Low	02:04:50 - 02:24:23	-1587
Lake Havasu City	02:14:52	-19.1	Dark	Up	27.1	224.8	Low	02:05:05 - 02:24:38	-1589
Idyllwild	02:14:44	-17.1	AT	Up	29.0	222.9	Low	02:04:58 - 02:24:31	-1624
George/Scottsdale	02:15:02	-21.2	Dark	Up	26.2	227.2	Low	02:05:16 - 02:24:49	-1665
Calipatria	02:14:51	-18.0	Dark	Up	28.8	224.2	Low	02:05:04 - 02:24:37	-1678
Yuma	02:14:55	-18.7	Dark	Up	28.6	225.2	Low	02:05:09 - 02:24:42	-1716