RECON: TNO occultation with 447178

Event between (447178) 05RO43 and star GA0740:02242301 with event index number of 2290319

Geocentric closest approach at 2025/02/16 05:27:46 UTC

J2000 position of star is 07:17:31.0 -15:08:51
Equinox of date position of star is 07:18:37.5 -15:11:34
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 78 degrees from the moon. Moon is 88% illuminated.
Apparent brightness V=19.4

[RECON map]
Object is 15.8 AU from the Sun and 15.1 AU from the Earth.
Apparent velocity is 19.6 km/sec on the sky relative to the star, or, 6.4 arcsec/hr.
The 1-sigma error in the time of the event is 37 seconds.
The 1-sigma cross-track error in the shadow position is 733 km.
The sky-plane scale is 10973.9 km/arcsec.

The object has an absolute magnitude Hv=7.2
Diameter=208.9 km assuming a 5% albedo -- 11.4 sec chord
Diameter=85.3 km assuming a 30% albedo -- 4.6 sec chord
Dynamical classification is CENTAURR

Star training set for 447178, (2025/02/16 05:24UT)
Object            RA         Dec     mag  sep  mel
Sirius         06:46:15.4 -16:45:04 -1.5  7.94  85
25Del CMa      07:09:24.8 -26:26:05  1.9 11.45  80
PPM 218414     07:17:22.9 -15:37:55  5.6  0.54  78
PPM 218447     07:18:55.4 -14:54:06  8.5  0.30  78
PPM 218446     07:18:53.5 -15:02:53  8.7  0.16  78
447178         07:18:39.7 -15:11:39 16.7        77
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 11.0 km RECON observability=1.0 and success probability=5.5%

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

Sleaford 05:30:26 -44.7 Dark Up 21.7 194.3 Low 05:26:50 - 05:34:02 2418

Dunrhomin 05:29:53 -53.7 Dark Up 33.0 196.6 Up 05:26:17 - 05:33:29 2118

Nikitin 05:29:53 -53.8 Dark Up 33.2 196.6 Up 05:26:17 - 05:33:29 2111

CU-SBO 05:29:53 -53.8 Dark Up 33.3 196.6 Up 05:26:17 - 05:33:29 2104

Kelowna 05:30:58 -40.0 Dark Up 25.0 180.4 Low 05:27:22 - 05:34:34 1762

Kamloops 05:31:01 -39.1 Dark Up 24.2 179.4 Low 05:27:25 - 05:34:37 1749

Penticton 05:30:57 -40.2 Dark Up 25.3 180.3 Low 05:27:21 - 05:34:33 1746

Peachland 05:30:58 -39.9 Dark Up 25.1 180.1 Low 05:27:22 - 05:34:34 1744

Summerland 05:30:58 -40.1 Dark Up 25.3 180.2 Low 05:27:22 - 05:34:34 1743

Anarchist Mountain Observatory 05:30:57 -40.6 Dark Up 25.8 180.5 Low 05:27:21 - 05:34:33 1737

Oliver 05:30:58 -40.4 Dark Up 25.7 180.3 Low 05:27:22 - 05:34:34 1733

Okanogan 05:30:55 -40.8 Dark Up 26.5 180.3 Low 05:27:19 - 05:34:31 1702

Brewster 05:30:56 -40.8 Dark Up 26.8 180.0 Low 05:27:20 - 05:34:32 1682

Manson/Chelan 05:30:56 -40.7 Dark Up 27.0 179.6 Low 05:27:20 - 05:34:32 1656

PNWRO 05:30:50 -42.4 Dark Up 28.8 181.0 Low 05:27:14 - 05:34:26 1644

Wenatchee 05:30:57 -40.9 Dark Up 27.4 179.5 Low 05:27:21 - 05:34:33 1629

Ellensburg 05:30:57 -41.0 Dark Up 27.9 179.2 Low 05:27:21 - 05:34:33 1601

Yakima 05:30:56 -41.2 Dark Up 28.3 179.2 Low 05:27:20 - 05:34:32 1584

Toppenish/White Swan 05:30:55 -41.4 Dark Up 28.5 179.4 Low 05:27:19 - 05:34:31 1584

Victoria 05:31:07 -38.6 Dark Up 26.3 176.2 Low 05:27:31 - 05:34:43 1521

The Dalles 05:30:55 -41.3 Dark Up 29.2 178.5 Low 05:27:19 - 05:34:31 1511

Maupin 05:30:55 -41.6 Dark Up 29.7 178.6 Low 05:27:19 - 05:34:31 1498

George/Scottsdale 05:29:58 -53.2 Dark Up 40.6 189.8 Up 05:26:22 - 05:33:34 1474

Patrick 05:30:10 -51.0 Dark Up 39.1 187.2 Up 05:26:34 - 05:33:46 1443

Bend 05:30:53 -42.0 Dark Up 30.8 178.3 Up 05:27:17 - 05:34:29 1438

Sisters 05:30:55 -41.7 Dark Up 30.5 178.0 Up 05:27:19 - 05:34:31 1434

Oregon Observatory 05:30:54 -42.0 Dark Up 30.9 178.2 Up 05:27:18 - 05:34:30 1423

Laughlin/Bullhead City 05:30:12 -50.6 Dark Up 39.5 186.3 Up 05:26:36 - 05:33:48 1389

Cedarville 05:30:45 -43.9 Dark Up 33.3 179.5 Up 05:27:09 - 05:34:21 1383

Lake Havasu City 05:30:10 -51.0 Dark Up 40.1 186.7 Up 05:26:34 - 05:33:46 1370

Beatty 05:30:24 -48.2 Dark Up 37.9 183.6 Up 05:26:48 - 05:34:00 1351

Chiloquin 05:30:52 -42.3 Dark Up 32.3 177.6 Up 05:27:16 - 05:34:28 1340

Klamath Falls 05:30:52 -42.5 Dark Up 32.6 177.7 Up 05:27:16 - 05:34:28 1328

Hawthorne 05:30:33 -46.2 Dark Up 36.3 181.3 Up 05:26:57 - 05:34:09 1325

Yerington 05:30:36 -45.7 Dark Up 35.9 180.7 Up 05:27:00 - 05:34:12 1318

Reno 05:30:40 -45.0 Dark Up 35.3 179.9 Up 05:27:04 - 05:34:16 1308

Fall River/Burney 05:30:48 -43.3 Dark Up 33.8 178.1 Up 05:27:12 - 05:34:24 1293

Carson City 05:30:39 -45.1 Dark Up 35.7 179.9 Up 05:27:03 - 05:34:15 1292

Portola 05:30:42 -44.4 Dark Up 35.0 179.2 Up 05:27:06 - 05:34:18 1285

Gardnerville 05:30:38 -45.3 Dark Up 35.9 180.0 Up 05:27:02 - 05:34:14 1282

Bishop 05:30:30 -46.9 Dark Up 37.5 181.6 Up 05:26:54 - 05:34:06 1281

Gimple 05:30:44 -44.0 Dark Up 34.7 178.7 Up 05:27:08 - 05:34:20 1278

Greenville 05:30:45 -43.9 Dark Up 34.7 178.6 Up 05:27:09 - 05:34:21 1274

Lee Vining 05:30:34 -46.1 Dark Up 36.9 180.7 Up 05:26:58 - 05:34:10 1270

Quincy 05:30:44 -44.0 Dark Up 34.9 178.6 Up 05:27:08 - 05:34:20 1264

Yuma 05:30:06 -51.6 Dark Up 41.9 186.5 Up 05:26:30 - 05:33:42 1258

Calipatria 05:30:10 -50.7 Dark Up 41.6 185.3 Up 05:26:34 - 05:33:46 1228

Idyllwild 05:30:16 -49.6 Dark Up 41.0 183.8 Up 05:26:40 - 05:33:52 1191

Wildwood 05:30:23 -48.0 Dark Up 40.7 181.4 Up 05:26:47 - 05:33:59 1097

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 447178, (2025/02/16 05:24UT)
Object            RA         Dec     mag  sep  mel
Sirius         06:45:08.0 -16:43:24 -1.5  7.94  85
25Del CMa      07:08:23.5 -26:23:35  1.9 11.45  80
PPM 218414     07:16:14.5 -15:35:09  5.6  0.54  78
PPM 218447     07:17:46.6 -14:51:17  8.5  0.30  78
PPM 218446     07:17:44.8 -15:00:05  8.7  0.16  78
447178         07:17:31.0 -15:08:51 16.7        78
Positions are for J2000

Event circumstances last updated at 2024/04/18 03:38:51 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	05:30:26	-44.7	Dark	Up	21.7	194.3	Low	05:26:50 - 05:34:02	2418
Dunrhomin	05:29:53	-53.7	Dark	Up	33.0	196.6	Up	05:26:17 - 05:33:29	2118
Nikitin	05:29:53	-53.8	Dark	Up	33.2	196.6	Up	05:26:17 - 05:33:29	2111
CU-SBO	05:29:53	-53.8	Dark	Up	33.3	196.6	Up	05:26:17 - 05:33:29	2104
Kelowna	05:30:58	-40.0	Dark	Up	25.0	180.4	Low	05:27:22 - 05:34:34	1762
Kamloops	05:31:01	-39.1	Dark	Up	24.2	179.4	Low	05:27:25 - 05:34:37	1749
Penticton	05:30:57	-40.2	Dark	Up	25.3	180.3	Low	05:27:21 - 05:34:33	1746
Peachland	05:30:58	-39.9	Dark	Up	25.1	180.1	Low	05:27:22 - 05:34:34	1744
Summerland	05:30:58	-40.1	Dark	Up	25.3	180.2	Low	05:27:22 - 05:34:34	1743
Anarchist Mountain Observatory	05:30:57	-40.6	Dark	Up	25.8	180.5	Low	05:27:21 - 05:34:33	1737
Oliver	05:30:58	-40.4	Dark	Up	25.7	180.3	Low	05:27:22 - 05:34:34	1733
Okanogan	05:30:55	-40.8	Dark	Up	26.5	180.3	Low	05:27:19 - 05:34:31	1702
Brewster	05:30:56	-40.8	Dark	Up	26.8	180.0	Low	05:27:20 - 05:34:32	1682
Manson/Chelan	05:30:56	-40.7	Dark	Up	27.0	179.6	Low	05:27:20 - 05:34:32	1656
PNWRO	05:30:50	-42.4	Dark	Up	28.8	181.0	Low	05:27:14 - 05:34:26	1644
Wenatchee	05:30:57	-40.9	Dark	Up	27.4	179.5	Low	05:27:21 - 05:34:33	1629
Ellensburg	05:30:57	-41.0	Dark	Up	27.9	179.2	Low	05:27:21 - 05:34:33	1601
Yakima	05:30:56	-41.2	Dark	Up	28.3	179.2	Low	05:27:20 - 05:34:32	1584
Toppenish/White Swan	05:30:55	-41.4	Dark	Up	28.5	179.4	Low	05:27:19 - 05:34:31	1584
Victoria	05:31:07	-38.6	Dark	Up	26.3	176.2	Low	05:27:31 - 05:34:43	1521
The Dalles	05:30:55	-41.3	Dark	Up	29.2	178.5	Low	05:27:19 - 05:34:31	1511
Maupin	05:30:55	-41.6	Dark	Up	29.7	178.6	Low	05:27:19 - 05:34:31	1498
George/Scottsdale	05:29:58	-53.2	Dark	Up	40.6	189.8	Up	05:26:22 - 05:33:34	1474
Patrick	05:30:10	-51.0	Dark	Up	39.1	187.2	Up	05:26:34 - 05:33:46	1443
Bend	05:30:53	-42.0	Dark	Up	30.8	178.3	Up	05:27:17 - 05:34:29	1438
Sisters	05:30:55	-41.7	Dark	Up	30.5	178.0	Up	05:27:19 - 05:34:31	1434
Oregon Observatory	05:30:54	-42.0	Dark	Up	30.9	178.2	Up	05:27:18 - 05:34:30	1423
Laughlin/Bullhead City	05:30:12	-50.6	Dark	Up	39.5	186.3	Up	05:26:36 - 05:33:48	1389
Cedarville	05:30:45	-43.9	Dark	Up	33.3	179.5	Up	05:27:09 - 05:34:21	1383
Lake Havasu City	05:30:10	-51.0	Dark	Up	40.1	186.7	Up	05:26:34 - 05:33:46	1370
Beatty	05:30:24	-48.2	Dark	Up	37.9	183.6	Up	05:26:48 - 05:34:00	1351
Chiloquin	05:30:52	-42.3	Dark	Up	32.3	177.6	Up	05:27:16 - 05:34:28	1340
Klamath Falls	05:30:52	-42.5	Dark	Up	32.6	177.7	Up	05:27:16 - 05:34:28	1328
Hawthorne	05:30:33	-46.2	Dark	Up	36.3	181.3	Up	05:26:57 - 05:34:09	1325
Yerington	05:30:36	-45.7	Dark	Up	35.9	180.7	Up	05:27:00 - 05:34:12	1318
Reno	05:30:40	-45.0	Dark	Up	35.3	179.9	Up	05:27:04 - 05:34:16	1308
Fall River/Burney	05:30:48	-43.3	Dark	Up	33.8	178.1	Up	05:27:12 - 05:34:24	1293
Carson City	05:30:39	-45.1	Dark	Up	35.7	179.9	Up	05:27:03 - 05:34:15	1292
Portola	05:30:42	-44.4	Dark	Up	35.0	179.2	Up	05:27:06 - 05:34:18	1285
Gardnerville	05:30:38	-45.3	Dark	Up	35.9	180.0	Up	05:27:02 - 05:34:14	1282
Bishop	05:30:30	-46.9	Dark	Up	37.5	181.6	Up	05:26:54 - 05:34:06	1281
Gimple	05:30:44	-44.0	Dark	Up	34.7	178.7	Up	05:27:08 - 05:34:20	1278
Greenville	05:30:45	-43.9	Dark	Up	34.7	178.6	Up	05:27:09 - 05:34:21	1274
Lee Vining	05:30:34	-46.1	Dark	Up	36.9	180.7	Up	05:26:58 - 05:34:10	1270
Quincy	05:30:44	-44.0	Dark	Up	34.9	178.6	Up	05:27:08 - 05:34:20	1264
Yuma	05:30:06	-51.6	Dark	Up	41.9	186.5	Up	05:26:30 - 05:33:42	1258
Calipatria	05:30:10	-50.7	Dark	Up	41.6	185.3	Up	05:26:34 - 05:33:46	1228
Idyllwild	05:30:16	-49.6	Dark	Up	41.0	183.8	Up	05:26:40 - 05:33:52	1191
Wildwood	05:30:23	-48.0	Dark	Up	40.7	181.4	Up	05:26:47 - 05:33:59	1097