RECON: TNO occultation with 5145

Event between (5145) Pholus and star GA0740:20517892 with event index number of 1492899

Geocentric closest approach at 2025/08/08 06:58:01 UTC

J2000 position of star is 18:35:34.8 -14:13:20
Equinox of date position of star is 18:36:58.2 -14:12:02
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 27 degrees from the moon. Moon is 99% illuminated.
Apparent brightness V=22.0

[RECON map]
Object is 30.4 AU from the Sun and 29.6 AU from the Earth.
Apparent velocity is 20.4 km/sec on the sky relative to the star, or, 3.4 arcsec/hr.
The 1-sigma error in the time of the event is 141 seconds.
The 1-sigma cross-track error in the shadow position is 1460 km.
The sky-plane scale is 21438.3 km/arcsec.

The object has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 11.4 sec chord
Diameter=93.5 km assuming a 30% albedo -- 4.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 5145, (2025/08/08 06:58UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.9 -26:29:12  0.9 31.88  53
Nunki          18:56:51.0 -26:15:45  2.0 12.92  21
PPM 234707     18:35:06.8 -14:49:57  6.1  0.79  28
PPM 234768     18:37:39.4 -13:48:39  8.3  0.42  27
5145           18:37:02.1 -14:11:59 16.4        27
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 22.1 km RECON observability=1.0 and success probability=28.0%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Kamloops	06:55:36	-21.5	Dark	Up	22.4	202.8	Low	06:43:23 - 07:07:49	-463
Victoria	06:55:44	-22.8	Dark	Up	25.1	200.0	Low	06:43:31 - 07:07:57	-512
Peachland	06:55:33	-22.5	Dark	Up	23.1	203.5	Low	06:43:20 - 07:07:46	-529
Kelowna	06:55:33	-22.4	Dark	Up	22.9	203.8	Low	06:43:20 - 07:07:46	-530
Summerland	06:55:33	-22.6	Dark	Up	23.2	203.7	Low	06:43:20 - 07:07:46	-540
Penticton	06:55:33	-22.7	Dark	Up	23.2	203.8	Low	06:43:20 - 07:07:46	-546
Oliver	06:55:32	-23.0	Dark	Up	23.6	203.8	Low	06:43:19 - 07:07:45	-567
Anarchist Mountain Observatory	06:55:31	-23.2	Dark	Up	23.7	204.1	Low	06:43:18 - 07:07:44	-581
Okanogan	06:55:32	-23.8	Dark	Up	24.3	204.0	Low	06:43:19 - 07:07:45	-614
Brewster	06:55:32	-24.0	Dark	Up	24.6	203.8	Low	06:43:19 - 07:07:45	-625
Manson/Chelan	06:55:33	-24.1	Dark	Up	24.9	203.5	Low	06:43:20 - 07:07:46	-628
Wenatchee	06:55:33	-24.6	Dark	Up	25.4	203.4	Low	06:43:20 - 07:07:46	-652
Ellensburg	06:55:34	-24.9	Dark	Up	25.8	203.2	Low	06:43:21 - 07:07:47	-672
Yakima	06:55:33	-25.3	Dark	Up	26.2	203.3	Low	06:43:20 - 07:07:46	-696
Toppenish/White Swan	06:55:33	-25.5	Dark	Up	26.3	203.5	Low	06:43:20 - 07:07:46	-714
Sleaford	06:54:58	-21.8	Dark	Up	16.8	216.5	Really Low	06:42:45 - 07:07:11	-727
The Dalles	06:55:35	-26.1	Dark	Up	27.3	202.8	Low	06:43:22 - 07:07:48	-742
Maupin	06:55:34	-26.5	Dark	Up	27.6	203.0	Low	06:43:21 - 07:07:47	-771
PNWRO	06:55:28	-26.2	Dark	Up	26.3	205.1	Low	06:43:15 - 07:07:41	-775
Sisters	06:55:35	-27.2	Dark	Up	28.6	202.7	Low	06:43:22 - 07:07:48	-813
Bend	06:55:35	-27.5	Dark	Up	28.7	203.0	Low	06:43:22 - 07:07:48	-836
Oregon Observatory	06:55:35	-27.6	Dark	Up	28.9	202.9	Low	06:43:22 - 07:07:48	-843
Chiloquin	06:55:36	-28.7	Dark	Up	30.3	202.8	Up	06:43:23 - 07:07:49	-919
Klamath Falls	06:55:35	-29.1	Dark	Up	30.6	202.9	Up	06:43:22 - 07:07:48	-944
Fall River/Burney	06:55:34	-30.3	Dark	Up	31.5	203.6	Up	06:43:21 - 07:07:47	-1034
Cedarville	06:55:29	-30.1	Dark	Up	30.7	204.8	Up	06:43:16 - 07:07:42	-1035
Greenville	06:55:32	-31.2	Dark	Up	32.2	204.3	Up	06:43:19 - 07:07:45	-1110
Gimple	06:55:31	-31.3	Dark	Up	32.2	204.4	Up	06:43:18 - 07:07:44	-1112
Quincy	06:55:31	-31.4	Dark	Up	32.4	204.4	Up	06:43:18 - 07:07:44	-1124
Portola	06:55:30	-31.7	Dark	Up	32.4	204.9	Up	06:43:17 - 07:07:43	-1146
Reno	06:55:27	-32.1	Dark	Up	32.4	205.7	Up	06:43:14 - 07:07:40	-1184
Carson City	06:55:27	-32.4	Dark	Up	32.7	205.8	Up	06:43:14 - 07:07:40	-1210
Gardnerville	06:55:27	-32.7	Dark	Up	32.9	205.9	Up	06:43:14 - 07:07:40	-1229
Yerington	06:55:25	-32.8	Dark	Up	32.7	206.5	Up	06:43:12 - 07:07:38	-1243
Hawthorne	06:55:22	-33.4	Dark	Up	32.9	207.2	Up	06:43:09 - 07:07:35	-1292
Lee Vining	06:55:24	-33.8	Dark	Up	33.6	206.9	Up	06:43:11 - 07:07:37	-1319
Bishop	06:55:21	-34.5	Dark	Up	33.8	207.8	Up	06:43:08 - 07:07:34	-1385
Beatty	06:55:15	-35.4	Dark	Up	33.6	209.7	Up	06:43:02 - 07:07:28	-1469
Dunrhomin	06:54:38	-33.6	Dark	Up	25.8	220.0	Low	06:42:25 - 07:06:51	-1562
Nikitin	06:54:39	-33.8	Dark	Up	25.9	220.0	Low	06:42:26 - 07:06:52	-1576
CU-SBO	06:54:39	-33.9	Dark	Up	26.0	220.0	Low	06:42:26 - 07:06:52	-1578
Wildwood	06:55:21	-37.6	Dark	Up	36.8	208.7	Up	06:43:08 - 07:07:34	-1630
Laughlin/Bullhead City	06:55:06	-37.5	Dark	Up	34.2	212.6	Up	06:42:53 - 07:07:19	-1671
Patrick	06:55:04	-37.4	Dark	Up	33.7	213.2	Up	06:42:51 - 07:07:17	-1673
Idyllwild	06:55:13	-38.4	Dark	Up	36.4	210.9	Up	06:43:00 - 07:07:26	-1717
Lake Havasu City	06:55:05	-38.2	Dark	Up	34.7	213.1	Up	06:42:52 - 07:07:18	-1732
Calipatria	06:55:09	-39.3	Dark	Up	36.4	212.4	Up	06:42:56 - 07:07:22	-1804
Yuma	06:55:06	-39.9	Dark	Up	36.3	213.5	Up	06:42:53 - 07:07:19	-1868
George/Scottsdale	06:54:56	-39.4	Dark	Up	34.2	215.9	Up	06:42:43 - 07:07:09	-1873

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 5145, (2025/08/08 06:58UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 31.88  53
Nunki          18:55:15.9 -26:17:49  2.0 12.92  21
PPM 234707     18:33:39.1 -14:51:14  6.1  0.79  28
PPM 234768     18:36:12.4 -13:50:02  8.3  0.42  27
5145           18:35:34.8 -14:13:20 16.4        27
Positions are for J2000

Event circumstances last updated at 2024/06/18 02:52:17 UT

RECON