RECON: TNO occultation with 09JZ18

Event between 09JZ18 and star GA0740:05165577 with event index number of 2072775

Geocentric closest approach at 2025/06/02 07:27:12 UTC

J2000 position of star is 14:19:49.5 -14:39:54
Equinox of date position of star is 14:21:08.1 -14:46:27
Stellar brightness G=14.2, 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 42% illuminated.
Apparent brightness V=22.5

[RECON map]
Object is 29.6 AU from the Sun and 28.8 AU from the Earth.
Apparent velocity is 19.0 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 102 seconds.
The 1-sigma cross-track error in the shadow position is 1880 km.
The sky-plane scale is 20856.8 km/arcsec.

The object has an absolute magnitude Hv=7.7
Diameter=174.6 km assuming a 5% albedo -- 9.4 sec chord
Diameter=71.3 km assuming a 30% albedo -- 3.8 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 09JZ18, (2025/06/02 07:28UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:32.2 -11:17:35  1.0 13.76  52
PPM 228402     14:12:14.1 -16:25:16  4.2  2.71  64
PPM 228613     14:20:28.2 -14:38:43  8.5  0.23  65
09JZ18         14:21:12.8 -14:46:51 14.2        66
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 18.0 km RECON observability=1.0 and success probability=17.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 07:26:00 -15.5 AT Up 14.2 221.5 Really Low 07:16:59 - 07:35:01 582
Kamloops 07:26:39 -16.7 AT Up 20.4 208.3 Low 07:17:38 - 07:35:40 497
Kelowna 07:26:34 -17.6 AT Up 20.8 209.3 Low 07:17:33 - 07:35:35 468
Peachland 07:26:35 -17.7 AT Up 21.0 209.1 Low 07:17:34 - 07:35:36 462
Summerland 07:26:34 -17.9 AT Up 21.1 209.2 Low 07:17:33 - 07:35:35 457
Penticton 07:26:34 -17.9 AT Up 21.2 209.3 Low 07:17:33 - 07:35:35 454
Oliver 07:26:33 -18.3 Dark Up 21.5 209.4 Low 07:17:32 - 07:35:34 440
Anarchist Mountain Observatory 07:26:32 -18.5 Dark Up 21.6 209.6 Low 07:17:31 - 07:35:33 434
Okanogan 07:26:31 -19.1 Dark Up 22.2 209.5 Low 07:17:30 - 07:35:32 405
Brewster 07:26:31 -19.3 Dark Up 22.5 209.3 Low 07:17:30 - 07:35:32 392
Victoria 07:26:44 -18.5 Dark Up 23.2 205.7 Low 07:17:43 - 07:35:45 389
Manson/Chelan 07:26:31 -19.5 Dark Up 22.8 209.0 Low 07:17:30 - 07:35:32 381
Wenatchee 07:26:31 -20.0 Dark Up 23.3 209.0 Low 07:17:30 - 07:35:32 358
Ellensburg 07:26:31 -20.4 Dark Up 23.7 208.8 Low 07:17:30 - 07:35:32 339
Yakima 07:26:30 -20.8 Dark Up 24.1 208.9 Low 07:17:29 - 07:35:31 319
Toppenish/White Swan 07:26:29 -21.0 Dark Up 24.2 209.1 Low 07:17:28 - 07:35:30 310
PNWRO 07:26:22 -21.5 Dark Up 24.0 210.6 Low 07:17:21 - 07:35:23 301
The Dalles 07:26:30 -21.7 Dark Up 25.1 208.5 Low 07:17:29 - 07:35:31 268
Maupin 07:26:28 -22.1 Dark Up 25.5 208.7 Low 07:17:27 - 07:35:29 249
Sisters 07:26:28 -22.9 Dark Up 26.4 208.4 Low 07:17:27 - 07:35:29 202
Bend 07:26:26 -23.2 Dark Up 26.5 208.7 Low 07:17:25 - 07:35:27 192
Oregon Observatory 07:26:26 -23.3 Dark Up 26.7 208.6 Low 07:17:25 - 07:35:27 182
Chiloquin 07:26:25 -24.6 Dark Up 28.0 208.5 Low 07:17:24 - 07:35:26 110
Klamath Falls 07:26:24 -24.9 Dark Up 28.3 208.7 Low 07:17:23 - 07:35:25 92
Cedarville 07:26:16 -25.8 Dark Up 28.3 210.5 Low 07:17:15 - 07:35:17 64
Dunrhomin 07:25:18 -27.2 Dark Down 22.5 224.7 Low 07:16:17 - 07:34:19 31
Fall River/Burney 07:26:20 -26.1 Dark Up 29.2 209.4 Low 07:17:19 - 07:35:21 29
Nikitin 07:25:17 -27.4 Dark Down 22.7 224.8 Low 07:16:16 - 07:34:18 21
CU-SBO 07:25:17 -27.5 Dark Down 22.8 224.7 Low 07:16:16 - 07:34:18 17
Gimple 07:26:16 -27.1 Dark Up 29.8 210.1 Low 07:17:15 - 07:35:17 -19
Greenville 07:26:16 -27.1 Dark Up 29.8 210.1 Low 07:17:15 - 07:35:17 -19
Quincy 07:26:15 -27.3 Dark Up 30.0 210.1 Up 07:17:14 - 07:35:16 -31
Portola 07:26:13 -27.5 Dark Up 29.9 210.6 Low 07:17:12 - 07:35:14 -35
Reno 07:26:10 -27.8 Dark Up 29.9 211.4 Low 07:17:09 - 07:35:11 -47
Carson City 07:26:09 -28.2 Dark Up 30.2 211.5 Up 07:17:08 - 07:35:10 -68
Yerington 07:26:06 -28.4 Dark Up 30.1 212.2 Up 07:17:05 - 07:35:07 -75
Gardnerville 07:26:08 -28.4 Dark Up 30.4 211.6 Up 07:17:07 - 07:35:09 -82
Hawthorne 07:26:03 -28.9 Dark Up 30.3 212.8 Up 07:17:02 - 07:35:04 -100
Lee Vining 07:26:03 -29.4 Dark Up 31.0 212.5 Up 07:17:02 - 07:35:04 -137
Bishop 07:25:59 -30.1 Dark Up 31.2 213.4 Up 07:16:58 - 07:35:00 -170
Beatty 07:25:51 -30.7 Dark Up 30.8 215.2 Up 07:16:50 - 07:34:52 -191
Patrick 07:25:36 -32.3 Dark Up 30.7 218.5 Up 07:16:35 - 07:34:37 -274
Laughlin/Bullhead City 07:25:38 -32.5 Dark Up 31.2 217.9 Up 07:16:37 - 07:34:39 -293
Lake Havasu City 07:25:35 -33.2 Dark Up 31.6 218.4 Up 07:16:34 - 07:34:36 -336
George/Scottsdale 07:25:23 -34.1 Dark Up 30.9 221.0 Up 07:16:22 - 07:34:24 -380
Wildwood 07:25:52 -33.3 Dark Up 34.0 214.4 Up 07:16:51 - 07:34:53 -383
Idyllwild 07:25:43 -33.8 Dark Up 33.4 216.4 Up 07:16:42 - 07:34:44 -396
Calipatria 07:25:37 -34.5 Dark Up 33.3 217.8 Up 07:16:36 - 07:34:38 -433
Yuma 07:25:32 -35.0 Dark Up 33.2 218.8 Up 07:16:31 - 07:34:33 -459

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 09JZ18, (2025/06/02 07:28UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 13.76  52
PPM 228402     14:10:50.5 -16:18:08  4.2  2.71  64
PPM 228613     14:19:05.0 -14:31:46  8.5  0.23  65
09JZ18         14:19:49.5 -14:39:54 14.2        65
Positions are for J2000

Event circumstances last updated at 2023/12/22 05:55:05 UT

Marc W. Buie, Southwest Research Institute

RECON