RECON: TNO occultation with 469442

Event between (469442) 02GG166 and star GA0580:40099303 with event index number of 1386735

Geocentric closest approach at 2025/06/05 09:56:24 UTC

J2000 position of star is 18:37:51.1 -30:33:04
Equinox of date position of star is 18:39:25.3 -30:31:42
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 88 degrees from the moon. Moon is 71% illuminated.
Apparent brightness V=20.0

[RECON map]
Object is 14.9 AU from the Sun and 14.0 AU from the Earth.
Apparent velocity is 17.5 km/sec on the sky relative to the star, or, 6.2 arcsec/hr.
The 1-sigma error in the time of the event is 158 seconds.
The 1-sigma cross-track error in the shadow position is 595 km.
The sky-plane scale is 10153.6 km/arcsec.

The object has an absolute magnitude Hv=8.2
Diameter=136.1 km assuming a 5% albedo -- 7.8 sec chord
Diameter=55.6 km assuming a 30% albedo -- 3.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 469442, (2025/06/05 09:56UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.2 -26:29:10  0.9 28.42  60
38Zet Sgr      19:04:13.6 -29:50:29  2.7  5.39  93
PPM 268632     18:37:37.0 -29:40:35  6.4  0.94  88
PPM 297973     18:40:30.2 -30:29:41  8.0  0.22  88
PPM 297955     18:39:44.8 -30:26:48  9.7  0.10  88
469442         18:39:29.1 -30:31:38 16.9        88
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 28.4 km RECON observability=0.3 and success probability=0.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Victoria 09:55:20 -15.2 AT Down 10.9 180.0 Really Low 09:41:40 - 10:08:59 3859
Kamloops 09:55:07 -12.5 AT Down 8.7 182.6 Really Low 09:41:28 - 10:08:47 3858
Peachland 09:55:05 -13.1 AT Down 9.6 183.2 Really Low 09:41:25 - 10:08:44 3832
Kelowna 09:55:03 -12.9 AT Down 9.5 183.4 Really Low 09:41:24 - 10:08:43 3829
Summerland 09:55:04 -13.2 AT Down 9.8 183.2 Really Low 09:41:24 - 10:08:43 3828
Penticton 09:55:04 -13.2 AT Down 9.8 183.3 Really Low 09:41:24 - 10:08:43 3824
Oliver 09:55:04 -13.5 AT Down 10.2 183.3 Really Low 09:41:24 - 10:08:43 3817
Anarchist Mountain Observatory 09:55:03 -13.6 AT Down 10.4 183.5 Really Low 09:41:24 - 10:08:43 3811
Okanogan 09:55:04 -14.3 AT Down 11.0 183.3 Really Low 09:41:24 - 10:08:43 3800
Manson/Chelan 09:55:06 -14.9 AT Down 11.5 182.8 Really Low 09:41:27 - 10:08:46 3799
Brewster 09:55:04 -14.6 AT Down 11.3 183.2 Really Low 09:41:25 - 10:08:44 3797
Wenatchee 09:55:07 -15.3 AT Down 12.0 182.7 Really Low 09:41:27 - 10:08:46 3790
Ellensburg 09:55:08 -15.8 AT Down 12.4 182.5 Really Low 09:41:28 - 10:08:47 3784
Yakima 09:55:08 -16.1 AT Down 12.8 182.5 Really Low 09:41:29 - 10:08:48 3774
Toppenish/White Swan 09:55:07 -16.3 AT Down 13.0 182.7 Really Low 09:41:28 - 10:08:47 3766
The Dalles 09:55:11 -17.2 AT Down 13.8 182.0 Really Low 09:41:31 - 10:08:50 3758
Maupin 09:55:10 -17.6 AT Down 14.2 182.1 Really Low 09:41:30 - 10:08:49 3745
PNWRO 09:55:01 -16.1 AT Down 13.3 184.0 Really Low 09:41:21 - 10:08:40 3732
Sisters 09:55:12 -18.5 Dark Down 15.1 181.6 Really Low 09:41:33 - 10:08:52 3729
Bend 09:55:11 -18.6 Dark Down 15.4 181.9 Really Low 09:41:32 - 10:08:51 3718
Oregon Observatory 09:55:12 -18.8 Dark Down 15.5 181.8 Really Low 09:41:32 - 10:08:51 3715
Chiloquin 09:55:14 -20.1 Dark Down 16.9 181.4 Really Low 09:41:35 - 10:08:54 3681
Klamath Falls 09:55:14 -20.4 Dark Down 17.2 181.5 Really Low 09:41:34 - 10:08:53 3668
Fall River/Burney 09:55:13 -21.3 Dark Down 18.4 181.8 Really Low 09:41:33 - 10:08:52 3622
Sleaford 09:54:15 -6.4 NT Down 6.0 194.9 Really Low 09:40:35 - 10:07:54 3619
Cedarville 09:55:06 -20.5 Dark Down 17.9 182.9 Really Low 09:41:27 - 10:08:46 3618
Greenville 09:55:11 -22.0 Dark Down 19.3 182.2 Really Low 09:41:31 - 10:08:50 3582
Gimple 09:55:10 -22.0 Dark Down 19.3 182.3 Really Low 09:41:31 - 10:08:50 3580
Quincy 09:55:10 -22.2 Dark Down 19.5 182.3 Really Low 09:41:31 - 10:08:50 3574
Portola 09:55:08 -22.1 Dark Down 19.6 182.7 Really Low 09:41:29 - 10:08:48 3562
Reno 09:55:06 -22.1 Dark Down 19.8 183.3 Really Low 09:41:26 - 10:08:45 3540
Carson City 09:55:06 -22.4 Dark Down 20.2 183.3 Low 09:41:26 - 10:08:45 3526
Gardnerville 09:55:05 -22.6 Dark Down 20.4 183.3 Low 09:41:26 - 10:08:45 3516
Yerington 09:55:02 -22.3 Dark Down 20.3 183.9 Low 09:41:23 - 10:08:42 3507
Hawthorne 09:55:00 -22.5 Dark Down 20.8 184.4 Low 09:41:21 - 10:08:40 3478
Lee Vining 09:55:03 -23.2 Dark Down 21.4 183.9 Low 09:41:23 - 10:08:42 3465
Bishop 09:54:59 -23.4 Dark Down 21.9 184.6 Low 09:41:19 - 10:08:38 3426
Beatty 09:54:51 -23.2 Dark Down 22.3 186.1 Low 09:41:12 - 10:08:31 3373
Wildwood 09:55:01 -26.3 Dark Down 25.2 184.5 Low 09:41:21 - 10:08:40 3282
Laughlin/Bullhead City 09:54:40 -23.6 Dark Down 23.8 188.2 Low 09:41:01 - 10:08:20 3246
Patrick 09:54:37 -23.1 Dark Down 23.4 188.8 Low 09:40:57 - 10:08:16 3241
Dunrhomin 09:53:59 -15.1 AT Down 17.3 196.1 Really Low 09:40:20 - 10:07:39 3233
Idyllwild 09:54:51 -25.8 Dark Down 25.4 186.3 Low 09:41:12 - 10:08:31 3226
Nikitin 09:53:59 -15.3 AT Down 17.4 196.1 Really Low 09:40:19 - 10:07:38 3225
CU-SBO 09:54:00 -15.4 AT Down 17.5 196.1 Really Low 09:40:21 - 10:07:40 3225
Lake Havasu City 09:54:40 -24.1 Dark Down 24.4 188.5 Low 09:41:00 - 10:08:19 3208
Calipatria 09:54:45 -25.8 Dark Down 25.9 187.4 Low 09:41:06 - 10:08:25 3168
Yuma 09:54:41 -25.7 Dark Down 26.2 188.3 Low 09:41:02 - 10:08:21 3126
George/Scottsdale 09:54:27 -23.5 Dark Down 24.8 190.8 Low 09:40:48 - 10:08:07 3110

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 469442, (2025/06/05 09:56UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 28.42  60
38Zet Sgr      19:02:36.7 -29:52:49  2.7  5.39  93
PPM 268632     18:35:59.7 -29:41:57  6.4  0.94  88
PPM 297973     18:38:52.3 -30:31:09  8.0  0.22  88
PPM 297955     18:38:06.9 -30:28:14  9.7  0.10  88
469442         18:37:51.1 -30:33:04 16.9        88
Positions are for J2000

Event circumstances last updated at 2024/06/13 03:52:16 UT

Marc W. Buie, Southwest Research Institute

RECON