RECON: TNO occultation with 601690

Event between (601690) 13KZ18 and star GA1340:00274502 with event index number of 2733130

Geocentric closest approach at 2025/09/23 12:38:44 UTC

J2000 position of star is 00:43:40.8 +44:01:19
Equinox of date position of star is 00:44:59.5 +44:09:04
Stellar brightness G=16.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 146 degrees from the moon. Moon is 3% illuminated.
Apparent brightness V=22.3

[RECON map]
Object is 21.0 AU from the Sun and 20.3 AU from the Earth.
Apparent velocity is 21.1 km/sec on the sky relative to the star, or, 5.2 arcsec/hr.
The 1-sigma error in the time of the event is 82 seconds.
The 1-sigma cross-track error in the shadow position is 1454 km.
The sky-plane scale is 14713.6 km/arcsec.

The object has an absolute magnitude Hv=8.9
Diameter=100.5 km assuming a 5% albedo -- 4.9 sec chord
Diameter=41.0 km assuming a 30% albedo -- 2.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 601690, (2025/09/23 12:41UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:18.6 +45:22:24  1.3 42.06 114
57Gam1And      02:05:29.4 +42:27:07  2.3 14.69 146
PPM 043369     00:51:45.1 +45:08:31  6.1  1.54 145
PPM 043219     00:43:47.1 +44:04:41  8.1  0.25 146
PPM 043239     00:44:52.2 +43:59:51 10.1  0.17 146
601690         00:45:06.3 +44:09:45 16.3       146
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 26.8 km RECON observability=0.1 and success probability=1.5%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Sleaford	12:35:37	-3.4	CT	Down	41.7	291.8	Up	12:28:20 - 12:42:55	4141
Kamloops	12:35:52	-12.4	AT	Down	49.8	284.8	Up	12:28:35 - 12:43:10	3409
Kelowna	12:35:48	-12.1	AT	Down	49.0	286.2	Up	12:28:31 - 12:43:06	3378
Peachland	12:35:48	-12.3	AT	Down	49.2	286.2	Up	12:28:30 - 12:43:05	3356
Summerland	12:35:47	-12.3	AT	Down	49.1	286.4	Up	12:28:30 - 12:43:05	3347
Penticton	12:35:47	-12.2	AT	Down	49.0	286.5	Up	12:28:29 - 12:43:04	3346
Oliver	12:35:46	-12.3	AT	Down	48.9	286.9	Up	12:28:28 - 12:43:03	3317
Anarchist Mountain Observatory	12:35:45	-12.2	AT	Down	48.7	287.2	Up	12:28:27 - 12:43:02	3311
Dunrhomin	12:34:55	-3.6	CT	Down	36.1	300.7	Up	12:27:37 - 12:42:12	3307
Nikitin	12:34:54	-3.7	CT	Down	36.0	300.8	Up	12:27:37 - 12:42:12	3292
CU-SBO	12:34:54	-3.7	CT	Down	36.0	300.8	Up	12:27:37 - 12:42:12	3282
Okanogan	12:35:43	-12.5	AT	Down	48.7	287.8	Up	12:28:26 - 12:43:01	3246
Brewster	12:35:43	-12.7	AT	Down	48.7	287.9	Up	12:28:26 - 12:43:01	3215
Manson/Chelan	12:35:43	-13.0	AT	Down	48.9	288.0	Up	12:28:25 - 12:43:00	3181
Wenatchee	12:35:42	-13.3	AT	Down	48.8	288.4	Up	12:28:24 - 12:42:59	3133
Victoria	12:35:51	-14.9	AT	Down	51.1	285.6	Up	12:28:33 - 12:43:08	3098
Ellensburg	12:35:41	-13.5	AT	Down	48.8	288.8	Up	12:28:23 - 12:42:58	3088
PNWRO	12:35:34	-12.7	AT	Down	47.5	290.6	Up	12:28:17 - 12:42:52	3076
Yakima	12:35:39	-13.6	AT	Down	48.7	289.2	Up	12:28:22 - 12:42:57	3052
Toppenish/White Swan	12:35:38	-13.6	AT	Down	48.5	289.5	Up	12:28:21 - 12:42:56	3040
The Dalles	12:35:38	-14.3	AT	Down	48.8	290.0	Up	12:28:20 - 12:42:55	2937
Maupin	12:35:36	-14.3	AT	Down	48.6	290.5	Up	12:28:19 - 12:42:54	2905
Sisters	12:35:35	-14.9	AT	Down	48.6	291.2	Up	12:28:17 - 12:42:52	2806
Bend	12:35:33	-14.8	AT	Down	48.4	291.5	Up	12:28:16 - 12:42:51	2797
Oregon Observatory	12:35:33	-14.9	AT	Down	48.4	291.7	Up	12:28:15 - 12:42:50	2775
Chiloquin	12:35:30	-15.6	AT	Down	48.2	292.9	Up	12:28:12 - 12:42:47	2639
Cedarville	12:35:23	-14.6	AT	Down	46.6	294.5	Up	12:28:06 - 12:42:41	2627
Klamath Falls	12:35:29	-15.6	AT	Down	48.0	293.2	Up	12:28:11 - 12:42:46	2612
Fall River/Burney	12:35:25	-15.6	AT	Down	47.3	294.5	Up	12:28:07 - 12:42:42	2525
Gimple	12:35:21	-15.4	AT	Down	46.5	295.6	Up	12:28:04 - 12:42:39	2469
Reno	12:35:17	-14.8	AT	Down	45.5	296.4	Up	12:28:00 - 12:42:35	2468
Greenville	12:35:21	-15.5	AT	Down	46.6	295.6	Up	12:28:04 - 12:42:39	2465
Portola	12:35:19	-15.2	AT	Down	46.1	296.0	Up	12:28:02 - 12:42:37	2460
Yerington	12:35:15	-14.4	AT	Down	44.9	297.1	Up	12:27:57 - 12:42:32	2452
Quincy	12:35:21	-15.5	AT	Down	46.5	295.8	Up	12:28:03 - 12:42:38	2447
Hawthorne	12:35:12	-14.1	AT	Down	44.3	297.7	Up	12:27:55 - 12:42:30	2438
Carson City	12:35:16	-14.8	AT	Down	45.4	296.8	Up	12:27:59 - 12:42:34	2437
Patrick	12:34:54	-10.9	NT	Down	39.5	301.3	Up	12:27:37 - 12:42:12	2422
Gardnerville	12:35:16	-14.9	AT	Down	45.2	297.0	Up	12:27:58 - 12:42:33	2418
Beatty	12:35:04	-13.0	AT	Down	42.2	299.5	Up	12:27:47 - 12:42:22	2393
George/Scottsdale	12:34:47	-9.5	NT	Down	37.2	302.8	Up	12:27:29 - 12:42:04	2392
Lee Vining	12:35:12	-14.6	AT	Down	44.4	298.0	Up	12:27:54 - 12:42:29	2363
Laughlin/Bullhead City	12:34:55	-11.5	NT	Down	39.8	301.3	Up	12:27:38 - 12:42:13	2361
Bishop	12:35:09	-14.2	AT	Down	43.6	298.7	Up	12:27:51 - 12:42:26	2347
Lake Havasu City	12:34:53	-11.4	NT	Down	39.3	301.8	Up	12:27:36 - 12:42:11	2317
Yuma	12:34:49	-11.9	NT	Down	38.6	303.0	Up	12:27:32 - 12:42:07	2144
Calipatria	12:34:52	-12.6	AT	Down	39.4	302.5	Up	12:27:35 - 12:42:10	2130
Idyllwild	12:34:56	-13.5	AT	Down	40.6	301.9	Up	12:27:39 - 12:42:14	2117
Wildwood	12:35:01	-14.9	AT	Down	42.1	301.3	Up	12:27:44 - 12:42:19	2046

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 601690, (2025/09/23 12:41UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 42.06 114
57Gam1And      02:03:54.1 +42:19:46  2.3 14.69 146
PPM 043369     00:50:18.4 +45:00:08  6.1  1.54 145
PPM 043219     00:42:21.8 +43:56:15  8.1  0.25 146
PPM 043239     00:43:26.7 +43:51:25 10.1  0.17 146
601690         00:43:40.8 +44:01:19 16.3       146
Positions are for J2000

Event circumstances last updated at 2023/09/03 03:29:10 UT

RECON