RECON: TNO occultation with 524217

Event between (524217) 01RZ143 and star GA1080:00350720 with event index number of 1591885

Geocentric closest approach at 2025/11/15 09:02:12 UTC

J2000 position of star is 03:17:21.8 +19:45:55
Equinox of date position of star is 03:18:46.0 +19:51:14
Stellar brightness G=14.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 128 degrees from the moon. Moon is 20% illuminated.
Apparent brightness V=22.8

[RECON map]
Object is 41.3 AU from the Sun and 40.3 AU from the Earth.
Apparent velocity is 25.3 km/sec on the sky relative to the star, or, 3.1 arcsec/hr.
The 1-sigma error in the time of the event is 198 seconds.
The 1-sigma cross-track error in the shadow position is 2092 km.
The sky-plane scale is 29247.2 km/arcsec.

The object has an absolute magnitude Hv=6.7
Diameter=279.3 km assuming a 5% albedo -- 10.9 sec chord
Diameter=114.0 km assuming a 30% albedo -- 4.5 sec chord
Dynamical classification is CLASSICAL

Star training set for 524217, (2025/11/15 09:02UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.5 +16:33:34  0.8 18.93 110
44Zet Per      03:55:45.9 +31:57:30  2.8 14.66 116
57Del Ari      03:13:06.8 +19:49:22  4.3  1.35 129
PPM 118961     03:17:48.2 +19:25:54  8.5  0.49 128
PPM 118966     03:18:11.4 +19:29:03  9.9  0.41 128
PPM 118980     03:19:29.8 +19:38:47 10.5  0.26 127
524217         03:18:50.9 +19:51:32 14.9       127
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 4.5 sigma about the mid-time.
The median site spacing is 36.5 km RECON observability=1.0 and success probability=0.6%

Site Site mid-time
(UT) Sun alt
(deg) Sky Moon Star alt
(deg) Star az
(deg) Target Observing Time
(UT) X-track
(km)

Sleaford 09:00:11 -47.7 Dark Down 48.0 232.8 Up 08:45:11 - 09:15:11 -5272

Kamloops 09:00:46 -54.6 Dark Down 55.2 214.7 Up 08:45:46 - 09:15:46 -5335

Kelowna 09:00:43 -55.0 Dark Down 55.5 216.7 Up 08:45:43 - 09:15:43 -5423

Peachland 09:00:44 -55.2 Dark Down 55.8 216.4 Up 08:45:44 - 09:15:44 -5432

Summerland 09:00:43 -55.3 Dark Down 55.8 216.7 Up 08:45:43 - 09:15:43 -5447

Penticton 09:00:43 -55.3 Dark Down 55.8 216.9 Up 08:45:43 - 09:15:43 -5455

Oliver 09:00:43 -55.6 Dark Down 56.1 217.2 Up 08:45:43 - 09:15:43 -5490

Anarchist Mountain Observatory 09:00:43 -55.7 Dark Down 56.2 217.7 Up 08:45:43 - 09:15:43 -5508

Victoria 09:00:53 -57.5 Dark Down 58.1 211.7 Up 08:45:53 - 09:15:53 -5518

Okanogan 09:00:43 -56.3 Dark Down 56.8 217.9 Up 08:45:43 - 09:15:43 -5571

Brewster 09:00:43 -56.6 Dark Down 57.1 217.9 Up 08:45:43 - 09:15:43 -5597

Manson/Chelan 09:00:45 -56.9 Dark Down 57.4 217.5 Up 08:45:45 - 09:15:45 -5614

Wenatchee 09:00:45 -57.4 Dark Down 57.8 217.7 Up 08:45:45 - 09:15:45 -5660

Ellensburg 09:00:45 -57.8 Dark Down 58.3 217.7 Up 08:45:45 - 09:15:45 -5700

Yakima 09:00:46 -58.1 Dark Down 58.6 218.1 Up 08:45:46 - 09:15:46 -5741

Toppenish/White Swan 09:00:45 -58.3 Dark Down 58.7 218.6 Up 08:45:45 - 09:15:45 -5765

PNWRO 09:00:41 -57.9 Dark Down 58.3 221.3 Up 08:45:41 - 09:15:41 -5816

The Dalles 09:00:48 -59.2 Dark Down 59.6 218.1 Up 08:45:48 - 09:15:48 -5836

Maupin 09:00:47 -59.5 Dark Down 59.9 218.8 Up 08:45:47 - 09:15:47 -5880

Sisters 09:00:48 -60.4 Dark Down 60.8 218.9 Up 08:45:48 - 09:15:48 -5965

Bend 09:00:48 -60.5 Dark Down 60.9 219.6 Up 08:45:48 - 09:15:48 -5992

Oregon Observatory 09:00:48 -60.7 Dark Down 61.1 219.6 Up 08:45:48 - 09:15:48 -6008

Chiloquin 09:00:49 -61.9 Dark Down 62.3 220.5 Up 08:45:49 - 09:15:49 -6140

Klamath Falls 09:00:49 -62.2 Dark Down 62.5 221.0 Up 08:45:49 - 09:15:49 -6177

Cedarville 09:00:45 -62.0 Dark Down 62.2 224.6 Up 08:45:45 - 09:15:45 -6267

Fall River/Burney 09:00:48 -62.9 Dark Down 63.2 223.2 Up 08:45:48 - 09:15:48 -6304

Greenville 09:00:47 -63.4 Dark Down 63.6 225.3 Up 08:45:47 - 09:15:47 -6404

Gimple 09:00:46 -63.4 Dark Down 63.6 225.4 Up 08:45:46 - 09:15:46 -6406

Quincy 09:00:47 -63.6 Dark Down 63.7 225.6 Up 08:45:47 - 09:15:47 -6426

Portola 09:00:46 -63.4 Dark Down 63.6 226.6 Up 08:45:46 - 09:15:46 -6444

Reno 09:00:44 -63.3 Dark Down 63.4 228.0 Up 08:45:44 - 09:15:44 -6479

Dunrhomin 09:00:00 -53.9 Dark Down 53.6 246.2 Up 08:45:00 - 09:15:00 -6493

Nikitin 09:00:00 -54.0 Dark Down 53.7 246.4 Up 08:45:00 - 09:15:00 -6513

Carson City 09:00:44 -63.5 Dark Down 63.6 228.6 Up 08:45:44 - 09:15:44 -6518

CU-SBO 09:00:01 -54.1 Dark Down 53.8 246.4 Up 08:45:01 - 09:15:01 -6520

Gardnerville 09:00:43 -63.7 Dark Down 63.7 229.1 Up 08:45:43 - 09:15:43 -6544

Yerington 09:00:41 -63.3 Dark Down 63.4 229.9 Up 08:45:41 - 09:15:41 -6545

Hawthorne 09:00:40 -63.3 Dark Down 63.3 231.5 Up 08:45:40 - 09:15:40 -6600

Lee Vining 09:00:41 -64.0 Dark Down 64.0 231.6 Up 08:45:41 - 09:15:41 -6655

Bishop 09:00:40 -64.0 Dark Down 63.9 233.7 Up 08:45:40 - 09:15:40 -6726

Beatty 09:00:34 -63.3 Dark Down 63.1 236.9 Up 08:45:34 - 09:15:34 -6791

Patrick 09:00:25 -62.2 Dark Down 61.9 243.3 Up 08:45:25 - 09:15:25 -6976

Laughlin/Bullhead City 09:00:28 -62.8 Dark Down 62.5 242.8 Up 08:45:28 - 09:15:28 -6997

Lake Havasu City 09:00:26 -62.9 Dark Down 62.6 244.3 Up 08:45:26 - 09:15:26 -7072

Wildwood 09:00:40 -66.1 Dark Down 65.9 239.2 Up 08:45:40 - 09:15:40 -7077

Idyllwild 09:00:34 -65.0 Dark Down 64.7 242.6 Up 08:45:34 - 09:15:34 -7134

George/Scottsdale 09:00:19 -61.5 Dark Down 61.1 248.5 Up 08:45:19 - 09:15:19 -7174

Calipatria 09:00:30 -64.5 Dark Down 64.1 245.3 Up 08:45:30 - 09:15:30 -7212

Yuma 09:00:27 -64.0 Dark Down 63.6 247.2 Up 08:45:27 - 09:15:27 -7266

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 524217, (2025/11/15 09:02UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 18.93 110
44Zet Per      03:54:07.9 +31:53:01  2.8 14.66 116
57Del Ari      03:11:38.0 +19:43:36  4.3  1.35 129
PPM 118961     03:16:19.4 +19:20:15  8.5  0.49 128
PPM 118966     03:16:42.5 +19:23:26  9.9  0.41 128
PPM 118980     03:18:00.8 +19:33:12 10.5  0.26 127
524217         03:17:21.8 +19:45:55 14.9       127
Positions are for J2000

Event circumstances last updated at 2024/06/18 02:55:56 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	09:00:11	-47.7	Dark	Down	48.0	232.8	Up	08:45:11 - 09:15:11	-5272
Kamloops	09:00:46	-54.6	Dark	Down	55.2	214.7	Up	08:45:46 - 09:15:46	-5335
Kelowna	09:00:43	-55.0	Dark	Down	55.5	216.7	Up	08:45:43 - 09:15:43	-5423
Peachland	09:00:44	-55.2	Dark	Down	55.8	216.4	Up	08:45:44 - 09:15:44	-5432
Summerland	09:00:43	-55.3	Dark	Down	55.8	216.7	Up	08:45:43 - 09:15:43	-5447
Penticton	09:00:43	-55.3	Dark	Down	55.8	216.9	Up	08:45:43 - 09:15:43	-5455
Oliver	09:00:43	-55.6	Dark	Down	56.1	217.2	Up	08:45:43 - 09:15:43	-5490
Anarchist Mountain Observatory	09:00:43	-55.7	Dark	Down	56.2	217.7	Up	08:45:43 - 09:15:43	-5508
Victoria	09:00:53	-57.5	Dark	Down	58.1	211.7	Up	08:45:53 - 09:15:53	-5518
Okanogan	09:00:43	-56.3	Dark	Down	56.8	217.9	Up	08:45:43 - 09:15:43	-5571
Brewster	09:00:43	-56.6	Dark	Down	57.1	217.9	Up	08:45:43 - 09:15:43	-5597
Manson/Chelan	09:00:45	-56.9	Dark	Down	57.4	217.5	Up	08:45:45 - 09:15:45	-5614
Wenatchee	09:00:45	-57.4	Dark	Down	57.8	217.7	Up	08:45:45 - 09:15:45	-5660
Ellensburg	09:00:45	-57.8	Dark	Down	58.3	217.7	Up	08:45:45 - 09:15:45	-5700
Yakima	09:00:46	-58.1	Dark	Down	58.6	218.1	Up	08:45:46 - 09:15:46	-5741
Toppenish/White Swan	09:00:45	-58.3	Dark	Down	58.7	218.6	Up	08:45:45 - 09:15:45	-5765
PNWRO	09:00:41	-57.9	Dark	Down	58.3	221.3	Up	08:45:41 - 09:15:41	-5816
The Dalles	09:00:48	-59.2	Dark	Down	59.6	218.1	Up	08:45:48 - 09:15:48	-5836
Maupin	09:00:47	-59.5	Dark	Down	59.9	218.8	Up	08:45:47 - 09:15:47	-5880
Sisters	09:00:48	-60.4	Dark	Down	60.8	218.9	Up	08:45:48 - 09:15:48	-5965
Bend	09:00:48	-60.5	Dark	Down	60.9	219.6	Up	08:45:48 - 09:15:48	-5992
Oregon Observatory	09:00:48	-60.7	Dark	Down	61.1	219.6	Up	08:45:48 - 09:15:48	-6008
Chiloquin	09:00:49	-61.9	Dark	Down	62.3	220.5	Up	08:45:49 - 09:15:49	-6140
Klamath Falls	09:00:49	-62.2	Dark	Down	62.5	221.0	Up	08:45:49 - 09:15:49	-6177
Cedarville	09:00:45	-62.0	Dark	Down	62.2	224.6	Up	08:45:45 - 09:15:45	-6267
Fall River/Burney	09:00:48	-62.9	Dark	Down	63.2	223.2	Up	08:45:48 - 09:15:48	-6304
Greenville	09:00:47	-63.4	Dark	Down	63.6	225.3	Up	08:45:47 - 09:15:47	-6404
Gimple	09:00:46	-63.4	Dark	Down	63.6	225.4	Up	08:45:46 - 09:15:46	-6406
Quincy	09:00:47	-63.6	Dark	Down	63.7	225.6	Up	08:45:47 - 09:15:47	-6426
Portola	09:00:46	-63.4	Dark	Down	63.6	226.6	Up	08:45:46 - 09:15:46	-6444
Reno	09:00:44	-63.3	Dark	Down	63.4	228.0	Up	08:45:44 - 09:15:44	-6479
Dunrhomin	09:00:00	-53.9	Dark	Down	53.6	246.2	Up	08:45:00 - 09:15:00	-6493
Nikitin	09:00:00	-54.0	Dark	Down	53.7	246.4	Up	08:45:00 - 09:15:00	-6513
Carson City	09:00:44	-63.5	Dark	Down	63.6	228.6	Up	08:45:44 - 09:15:44	-6518
CU-SBO	09:00:01	-54.1	Dark	Down	53.8	246.4	Up	08:45:01 - 09:15:01	-6520
Gardnerville	09:00:43	-63.7	Dark	Down	63.7	229.1	Up	08:45:43 - 09:15:43	-6544
Yerington	09:00:41	-63.3	Dark	Down	63.4	229.9	Up	08:45:41 - 09:15:41	-6545
Hawthorne	09:00:40	-63.3	Dark	Down	63.3	231.5	Up	08:45:40 - 09:15:40	-6600
Lee Vining	09:00:41	-64.0	Dark	Down	64.0	231.6	Up	08:45:41 - 09:15:41	-6655
Bishop	09:00:40	-64.0	Dark	Down	63.9	233.7	Up	08:45:40 - 09:15:40	-6726
Beatty	09:00:34	-63.3	Dark	Down	63.1	236.9	Up	08:45:34 - 09:15:34	-6791
Patrick	09:00:25	-62.2	Dark	Down	61.9	243.3	Up	08:45:25 - 09:15:25	-6976
Laughlin/Bullhead City	09:00:28	-62.8	Dark	Down	62.5	242.8	Up	08:45:28 - 09:15:28	-6997
Lake Havasu City	09:00:26	-62.9	Dark	Down	62.6	244.3	Up	08:45:26 - 09:15:26	-7072
Wildwood	09:00:40	-66.1	Dark	Down	65.9	239.2	Up	08:45:40 - 09:15:40	-7077
Idyllwild	09:00:34	-65.0	Dark	Down	64.7	242.6	Up	08:45:34 - 09:15:34	-7134
George/Scottsdale	09:00:19	-61.5	Dark	Down	61.1	248.5	Up	08:45:19 - 09:15:19	-7174
Calipatria	09:00:30	-64.5	Dark	Down	64.1	245.3	Up	08:45:30 - 09:15:30	-7212
Yuma	09:00:27	-64.0	Dark	Down	63.6	247.2	Up	08:45:27 - 09:15:27	-7266