RECON: TNO occultation with 307251

Event between (307251) 02KW14 and star GA0620:20054029 with event index number of 2297011

Geocentric closest approach at 2026/07/04 05:44:44 UTC

J2000 position of star is 17:36:41.1 -27:38:51
Equinox of date position of star is 17:38:13.4 -27:39:39
Stellar brightness G=13.7, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 65 degrees from the moon. Moon is 84% illuminated.
Apparent brightness V=21.9

[RECON map]
Object is 43.7 AU from the Sun and 42.7 AU from the Earth.
Apparent velocity is 23.5 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 802 seconds.
The 1-sigma cross-track error in the shadow position is 5331 km.
The sky-plane scale is 30974.9 km/arcsec.

The object has an absolute magnitude Hv=5.5
Diameter=457.1 km assuming a 5% albedo -- 20.3 sec chord
Diameter=186.6 km assuming a 30% albedo -- 8.3 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 307251, (2026/07/04 05:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:02.2 -26:29:18  0.9 15.02  80
34Ups Sco      17:32:34.1 -37:18:51  2.7  9.73  66
PPM 266967     17:33:23.2 -26:17:15  6.3  1.76  66
PPM 267100     17:39:52.3 -28:03:37  6.7  0.52  65
PPM 267038     17:37:05.8 -27:22:47  9.7  0.40  65
307251         17:38:21.1 -27:39:43 13.7        64
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 1.1 sigma about the mid-time.
The median site spacing is 13.7 km RECON observability=0.5 and success probability=2.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 05:44:59 -12.9 AT Up 10.3 178.6 Really Low 05:29:59 - 05:59:59 246
Kamloops 05:45:42 -10.2 NT Down 10.4 165.8 Really Low 05:30:42 - 06:00:42 107
Kelowna 05:45:40 -11.2 NT Down 11.4 166.5 Really Low 05:30:40 - 06:00:40 96
Peachland 05:45:41 -11.2 NT Down 11.4 166.2 Really Low 05:30:41 - 06:00:41 90
Summerland 05:45:41 -11.4 NT Down 11.6 166.3 Really Low 05:30:41 - 06:00:41 87
Penticton 05:45:40 -11.5 NT Down 11.7 166.4 Really Low 05:30:40 - 06:00:40 87
Oliver 05:45:41 -11.8 NT Down 12.0 166.4 Really Low 05:30:41 - 06:00:41 77
Anarchist Mountain Observatory 05:45:40 -12.0 NT Down 12.2 166.6 Really Low 05:30:40 - 06:00:40 75
Okanogan 05:45:42 -12.4 AT Down 12.8 166.3 Really Low 05:30:42 - 06:00:42 54
Brewster 05:45:42 -12.6 AT Down 13.0 166.1 Really Low 05:30:42 - 06:00:42 43
Manson/Chelan 05:45:44 -12.6 AT Down 13.2 165.8 Really Low 05:30:44 - 06:00:44 33
Wenatchee 05:45:45 -13.0 AT Down 13.6 165.6 Really Low 05:30:45 - 06:00:45 16
Victoria 05:45:53 -10.9 NT Down 12.0 163.0 Really Low 05:30:53 - 06:00:53 10
Ellensburg 05:45:46 -13.3 AT Down 14.0 165.4 Really Low 05:30:46 - 06:00:46 1
PNWRO 05:45:41 -14.7 AT Down 15.2 166.8 Really Low 05:30:41 - 06:00:41 -12
Yakima 05:45:46 -13.6 AT Down 14.4 165.4 Really Low 05:30:46 - 06:00:46 -13
Toppenish/White Swan 05:45:46 -13.8 AT Down 14.6 165.5 Really Low 05:30:46 - 06:00:46 -18
The Dalles 05:45:49 -14.2 AT Down 15.2 164.8 Really Low 05:30:49 - 06:00:49 -54
Maupin 05:45:49 -14.6 AT Down 15.6 164.8 Really Low 05:30:49 - 06:00:49 -67
Sisters 05:45:51 -15.1 AT Down 16.4 164.3 Really Low 05:30:51 - 06:00:51 -105
Bend 05:45:51 -15.4 AT Down 16.7 164.5 Really Low 05:30:51 - 06:00:51 -110
Dunrhomin 05:44:58 -24.2 Dark Up 22.1 179.2 Low 05:29:58 - 05:59:58 -116
Oregon Observatory 05:45:51 -15.5 AT Down 16.8 164.4 Really Low 05:30:51 - 06:00:51 -118
Nikitin 05:44:58 -24.3 Dark Up 22.3 179.2 Low 05:29:58 - 05:59:58 -124
CU-SBO 05:44:58 -24.4 Dark Up 22.3 179.1 Low 05:29:58 - 05:59:58 -127
Chiloquin 05:45:53 -16.4 AT Down 18.0 163.9 Really Low 05:30:53 - 06:00:53 -176
Klamath Falls 05:45:53 -16.7 AT Down 18.3 164.0 Really Low 05:30:53 - 06:00:53 -188
Cedarville 05:45:49 -18.0 AT Down 19.3 165.3 Really Low 05:30:49 - 06:00:49 -194
Fall River/Burney 05:45:53 -17.9 AT Down 19.6 164.2 Really Low 05:30:53 - 06:00:53 -231
Gimple 05:45:53 -18.8 Dark Down 20.5 164.6 Low 05:30:53 - 06:00:53 -263
Greenville 05:45:53 -18.8 Dark Down 20.5 164.5 Low 05:30:53 - 06:00:53 -264
Portola 05:45:52 -19.3 Dark Down 20.9 164.9 Low 05:30:52 - 06:00:52 -271
Quincy 05:45:53 -19.0 Dark Down 20.7 164.5 Low 05:30:53 - 06:00:53 -273
Reno 05:45:50 -19.8 Dark Down 21.3 165.5 Low 05:30:50 - 06:00:50 -275
Carson City 05:45:50 -20.1 Dark Down 21.7 165.5 Low 05:30:50 - 06:00:50 -290
Yerington 05:45:48 -20.5 Dark Down 22.0 166.0 Low 05:30:48 - 06:00:48 -291
Gardnerville 05:45:50 -20.3 Dark Down 21.9 165.5 Low 05:30:50 - 06:00:50 -301
Hawthorne 05:45:46 -21.1 Dark Down 22.5 166.5 Low 05:30:46 - 06:00:46 -305
Lee Vining 05:45:48 -21.4 Dark Down 23.0 166.0 Low 05:30:48 - 06:00:48 -338
Bishop 05:45:46 -22.2 Dark Down 23.7 166.6 Low 05:30:46 - 06:00:46 -357
Beatty 05:45:40 -23.3 Dark Up 24.4 168.1 Low 05:30:40 - 06:00:40 -360
Patrick 05:45:30 -25.7 Dark Up 26.3 170.7 Low 05:30:30 - 06:00:30 -402
Laughlin/Bullhead City 05:45:33 -25.7 Dark Up 26.5 170.0 Low 05:30:33 - 06:00:33 -423
Lake Havasu City 05:45:33 -26.4 Dark Up 27.2 170.2 Low 05:30:33 - 06:00:33 -455
George/Scottsdale 05:45:23 -28.0 Dark Up 28.2 172.5 Low 05:30:23 - 06:00:23 -472
Idyllwild 05:45:42 -26.0 Dark Up 27.5 167.8 Low 05:30:42 - 06:00:42 -522
Wildwood 05:45:49 -24.9 Dark Up 26.8 166.0 Low 05:30:49 - 06:00:49 -528
Calipatria 05:45:38 -27.0 Dark Up 28.3 168.9 Low 05:30:38 - 06:00:38 -542
Yuma 05:45:34 -27.8 Dark Up 28.9 169.7 Low 05:30:34 - 06:00:34 -556

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 307251, (2026/07/04 05:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 15.02  80
34Ups Sco      17:30:45.8 -37:17:46  2.7  9.73  66
PPM 266967     17:31:44.4 -26:16:11  6.3  1.76  66
PPM 267100     17:38:12.0 -28:02:49  6.7  0.52  65
PPM 267038     17:35:26.1 -27:21:52  9.7  0.40  65
307251         17:36:41.1 -27:38:51 13.7        65
Positions are for J2000

Event circumstances last updated at 2024/06/19 21:30:00 UT

Marc W. Buie, Southwest Research Institute

RECON