RECON: TNO occultation with 50000

Event between (50000) Quaoar and star GA0740:22459086 with event index number of 2326936

Geocentric closest approach at 2025/06/12 09:51:20 UTC

J2000 position of star is 18:42:29.4 -14:53:03
Equinox of date position of star is 18:43:52.1 -14:51:32
Stellar brightness G=16.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 15 degrees from the moon. Moon is 99% illuminated.
Apparent brightness V=18.7

[RECON map]
Object is 42.6 AU from the Sun and 41.7 AU from the Earth.
Apparent velocity is 23.1 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 104 seconds.
The 1-sigma cross-track error in the shadow position is 1527 km.
The sky-plane scale is 30239.1 km/arcsec.

The object has an absolute magnitude Hv=2.4
Diameter=1905.5 km assuming a 5% albedo -- 85.6 sec chord
Diameter=777.9 km assuming a 30% albedo -- 34.9 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 50000, (2025/06/12 09:51UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.3 -26:29:10  0.9 33.08  24
Nunki          18:56:50.5 -26:15:46  2.0 11.80   8
PPM 234707     18:35:06.3 -14:49:57  6.1  2.14  14
PPM 234902     18:43:09.4 -14:32:17  6.6  0.37  15
PPM 234935     18:44:39.3 -14:39:21  9.2  0.27  15
50000          18:43:56.5 -14:51:27 16.1        15
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 21.0 km RECON observability=0.8 and success probability=41.7%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Kamloops	09:50:53	-12.3	AT	Up	24.1	188.2	Low	09:41:45 - 10:00:00	1200
Sleaford	09:50:13	-6.4	NT	Up	20.4	202.7	Low	09:41:05 - 09:59:20	1185
Kelowna	09:50:50	-12.8	AT	Up	24.8	189.2	Low	09:41:43 - 09:59:58	1158
Peachland	09:50:51	-13.0	AT	Up	25.0	188.9	Low	09:41:43 - 09:59:58	1154
Summerland	09:50:50	-13.1	AT	Up	25.1	189.0	Low	09:41:43 - 09:59:58	1147
Penticton	09:50:50	-13.1	AT	Up	25.1	189.1	Low	09:41:43 - 09:59:58	1143
Oliver	09:50:50	-13.4	AT	Up	25.5	189.1	Low	09:41:42 - 09:59:57	1126
Anarchist Mountain Observatory	09:50:49	-13.5	AT	Up	25.6	189.3	Low	09:41:42 - 09:59:57	1117
Victoria	09:51:02	-15.1	AT	Up	26.5	185.1	Low	09:41:54 - 10:00:09	1106
Okanogan	09:50:50	-14.1	AT	Up	26.3	189.1	Low	09:41:42 - 09:59:57	1085
Brewster	09:50:50	-14.4	AT	Up	26.6	189.0	Low	09:41:43 - 09:59:58	1072
Manson/Chelan	09:50:51	-14.7	AT	Up	26.8	188.6	Low	09:41:43 - 09:59:58	1063
Wenatchee	09:50:52	-15.2	AT	Up	27.3	188.4	Low	09:41:44 - 09:59:59	1039
Ellensburg	09:50:52	-15.7	AT	Up	27.8	188.2	Low	09:41:45 - 10:00:00	1018
Yakima	09:50:52	-16.0	AT	Up	28.2	188.2	Low	09:41:44 - 09:59:59	997
Toppenish/White Swan	09:50:51	-16.2	AT	Up	28.4	188.4	Low	09:41:44 - 09:59:59	984
PNWRO	09:50:46	-16.0	AT	Up	28.6	190.1	Low	09:41:39 - 09:59:54	959
The Dalles	09:50:54	-17.1	AT	Up	29.2	187.6	Low	09:41:46 - 10:00:01	945
Maupin	09:50:53	-17.5	AT	Up	29.6	187.8	Low	09:41:46 - 10:00:01	922
Sisters	09:50:54	-18.4	Dark	Up	30.5	187.3	Up	09:41:47 - 10:00:02	874
Bend	09:50:54	-18.5	Dark	Up	30.7	187.6	Up	09:41:46 - 10:00:01	860
Oregon Observatory	09:50:54	-18.7	Dark	Up	30.9	187.5	Up	09:41:46 - 10:00:01	850
Chiloquin	09:50:55	-20.0	Dark	Up	32.3	187.1	Up	09:41:47 - 10:00:02	774
Klamath Falls	09:50:55	-20.3	Dark	Up	32.6	187.2	Up	09:41:47 - 10:00:02	753
Cedarville	09:50:49	-20.4	Dark	Up	33.1	189.1	Up	09:41:41 - 09:59:56	704
Fall River/Burney	09:50:53	-21.3	Dark	Up	33.7	187.8	Up	09:41:45 - 10:00:00	679
Greenville	09:50:51	-21.9	Dark	Up	34.6	188.4	Up	09:41:43 - 09:59:58	620
Gimple	09:50:51	-21.9	Dark	Up	34.6	188.5	Up	09:41:43 - 09:59:58	619
Quincy	09:50:51	-22.1	Dark	Up	34.8	188.4	Up	09:41:43 - 09:59:58	607
Portola	09:50:49	-22.1	Dark	Up	34.8	188.9	Up	09:41:41 - 09:59:56	597
Reno	09:50:47	-22.1	Dark	Up	35.0	189.7	Up	09:41:39 - 09:59:54	577
Carson City	09:50:46	-22.4	Dark	Up	35.4	189.8	Up	09:41:39 - 09:59:54	553
Yerington	09:50:44	-22.3	Dark	Up	35.5	190.6	Up	09:41:37 - 09:59:52	538
Gardnerville	09:50:46	-22.6	Dark	Up	35.6	189.9	Up	09:41:39 - 09:59:54	537
Dunrhomin	09:49:56	-15.3	AT	Up	31.0	205.8	Up	09:40:48 - 09:59:03	520
Nikitin	09:49:56	-15.5	AT	Up	31.1	205.8	Up	09:40:48 - 09:59:03	508
CU-SBO	09:49:56	-15.6	AT	Up	31.2	205.7	Up	09:40:48 - 09:59:03	505
Hawthorne	09:50:42	-22.5	Dark	Up	35.9	191.2	Up	09:41:35 - 09:59:50	504
Lee Vining	09:50:44	-23.2	Dark	Up	36.5	190.7	Up	09:41:36 - 09:59:51	469
Bishop	09:50:41	-23.5	Dark	Up	37.0	191.7	Up	09:41:33 - 09:59:48	425
Beatty	09:50:34	-23.2	Dark	Up	37.1	193.7	Up	09:41:27 - 09:59:42	384
Patrick	09:50:23	-23.3	Dark	Up	38.0	197.4	Up	09:41:15 - 09:59:30	260
Laughlin/Bullhead City	09:50:25	-23.8	Dark	Up	38.4	196.6	Up	09:41:18 - 09:59:33	247
Lake Havasu City	09:50:24	-24.2	Dark	Up	38.9	197.0	Up	09:41:16 - 09:59:31	197
Wildwood	09:50:40	-26.4	Dark	Up	40.2	192.0	Up	09:41:33 - 09:59:48	194
Idyllwild	09:50:33	-25.9	Dark	Up	40.2	194.3	Up	09:41:25 - 09:59:40	157
George/Scottsdale	09:50:14	-23.7	Dark	Up	39.0	200.1	Up	09:41:06 - 09:59:21	122
Calipatria	09:50:28	-25.9	Dark	Up	40.5	195.9	Up	09:41:20 - 09:59:35	103
Yuma	09:50:24	-25.9	Dark	Up	40.7	197.1	Up	09:41:17 - 09:59:32	65

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, (2025/06/12 09:51UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 33.08  24
Nunki          18:55:15.9 -26:17:49  2.0 11.80   8
PPM 234707     18:33:39.1 -14:51:14  6.1  2.14  14
PPM 234902     18:41:42.5 -14:33:51  6.6  0.37  15
PPM 234935     18:43:12.4 -14:40:58  9.2  0.27  15
50000          18:42:29.4 -14:53:03 16.1        14
Positions are for J2000

Event circumstances last updated at 2024/03/02 06:19:18 UT

RECON