RECON: TNO occultation with 09JZ18

Event between 09JZ18 and star GA0740:05165577 with event index number of 1428360

Geocentric closest approach at 2025/06/02 07:34:57 UTC

J2000 position of star is 14:19:49.5 -14:39:54
Equinox of date position of star is 14:20:53.2 -14:45:13
Stellar brightness G=14.2, use SENSEUP=64
Star is 65 degrees from the moon. Moon is 42% illuminated.
TNO apparent brightness V=22.6

[RECON map]
TNO is 29.6 AU from the Sun and 28.8 AU from the Earth.
The TNO is moving 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 225 seconds.
The 1-sigma cross-track error in the shadow position is 4051 km.
The sky-plane scale is 20856.7 km/arcsec.

The TNO has an absolute magnitude Hv=7.8
Diameter=169.0 km assuming a 5% albedo -- 8.9 sec chord
Diameter=69.0 km assuming a 30% albedo -- 3.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 09JZ18, (2025/06/02 07:35UT)
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 -16:25:15  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 4.0 sigma about the mid-time.
The median site spacing is 12.7 km RECON observability=1.0 and success probability=5.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 07:34:13 -17.7 AT Up 20.2 211.3 Low 07:19:13 - 07:49:13 4499
Summerland 07:34:13 -18.0 AT Up 20.5 211.1 Low 07:19:13 - 07:49:13 4486
Penticton 07:34:12 -18.1 Dark Up 20.5 211.2 Low 07:19:12 - 07:49:12 4483
Okanagan Falls 07:34:13 -18.3 Dark Up 20.7 211.2 Low 07:19:13 - 07:49:13 4475
Oliver 07:34:12 -18.4 Dark Up 20.8 211.2 Low 07:19:12 - 07:49:12 4469
Anarchist Mountain Observatory 07:34:11 -18.6 Dark Up 20.9 211.5 Low 07:19:11 - 07:49:11 4462
Oroville 07:34:11 -18.7 Dark Up 21.0 211.4 Low 07:19:11 - 07:49:11 4459
Tonasket 07:34:10 -18.9 Dark Up 21.2 211.4 Low 07:19:10 - 07:49:10 4449
Okanogan 07:34:09 -19.2 Dark Up 21.5 211.4 Low 07:19:09 - 07:49:09 4434
Brewster 07:34:10 -19.5 Dark Up 21.8 211.2 Low 07:19:10 - 07:49:10 4421
Manson/Chelan 07:34:10 -19.7 Dark Up 22.2 210.9 Low 07:19:10 - 07:49:10 4410
Entiat 07:34:10 -19.9 Dark Up 22.4 210.9 Low 07:19:10 - 07:49:10 4400
Wenatchee 07:34:10 -20.1 Dark Up 22.6 210.8 Low 07:19:10 - 07:49:10 4388
Ellensburg 07:34:09 -20.5 Dark Up 23.1 210.7 Low 07:19:09 - 07:49:09 4369
Yakima 07:34:09 -20.9 Dark Up 23.4 210.8 Low 07:19:09 - 07:49:09 4350
Toppenish/White Swan 07:34:07 -21.2 Dark Up 23.5 211.0 Low 07:19:07 - 07:49:07 4340
Pasco 07:34:02 -21.4 Dark Up 23.2 212.2 Low 07:19:02 - 07:49:02 4340
PNWRO 07:34:01 -21.6 Dark Up 23.3 212.5 Low 07:19:01 - 07:49:01 4330
George/Umatilla 07:34:03 -21.7 Dark Up 23.6 212.1 Low 07:19:03 - 07:49:03 4324
Goldendale 07:34:08 -21.7 Dark Up 24.2 210.7 Low 07:19:08 - 07:49:08 4312
The Dalles 07:34:08 -21.9 Dark Up 24.5 210.4 Low 07:19:08 - 07:49:08 4299
Maupin 07:34:06 -22.3 Dark Up 24.8 210.6 Low 07:19:06 - 07:49:06 4280
Madras/Culver 07:34:06 -22.8 Dark Up 25.3 210.7 Low 07:19:06 - 07:49:06 4252
Redmond 07:34:04 -23.2 Dark Up 25.6 210.7 Low 07:19:04 - 07:49:04 4234
Sisters 07:34:07 -23.1 Dark Up 25.7 210.3 Low 07:19:07 - 07:49:07 4233
Bend 07:34:04 -23.4 Dark Up 25.9 210.6 Low 07:19:04 - 07:49:04 4222
Oregon Observatory 07:34:05 -23.5 Dark Up 26.1 210.5 Low 07:19:05 - 07:49:05 4213
La Pine/Gilchrist 07:34:05 -23.7 Dark Up 26.3 210.5 Low 07:19:05 - 07:49:05 4202
North Lake 07:34:01 -24.2 Dark Up 26.4 211.2 Low 07:19:01 - 07:49:01 4183
Paisley 07:33:58 -24.8 Dark Up 26.8 211.7 Low 07:18:58 - 07:48:58 4155
Chiloquin 07:34:03 -24.8 Dark Up 27.4 210.4 Low 07:19:03 - 07:49:03 4141
Lakeview 07:33:56 -25.3 Dark Up 27.1 212.0 Low 07:18:56 - 07:48:56 4129
Klamath Falls 07:34:02 -25.1 Dark Up 27.6 210.6 Low 07:19:02 - 07:49:02 4124
Tulelake 07:34:00 -25.4 Dark Up 27.7 211.0 Low 07:19:00 - 07:49:00 4111
Cedarville 07:33:54 -26.0 Dark Up 27.6 212.4 Low 07:18:54 - 07:48:54 4094
Fall River/Burney 07:33:57 -26.3 Dark Up 28.5 211.3 Low 07:18:57 - 07:48:57 4061
Niwot 07:32:57 -27.2 Dark Down 21.6 226.4 Low 07:17:57 - 07:47:57 4039
SwRI 07:32:57 -27.3 Dark Down 21.7 226.4 Low 07:17:57 - 07:47:57 4033
Susanville 07:33:54 -27.0 Dark Up 28.7 212.2 Low 07:18:54 - 07:48:54 4029
Gimple 07:33:53 -27.3 Dark Up 29.1 212.1 Low 07:18:53 - 07:48:53 4012
Greenville 07:33:54 -27.3 Dark Up 29.1 212.0 Low 07:18:54 - 07:48:54 4012
Quincy 07:33:54 -27.5 Dark Up 29.3 212.1 Low 07:18:54 - 07:48:54 4000
Portola 07:33:51 -27.7 Dark Up 29.2 212.6 Low 07:18:51 - 07:48:51 3995
Reno 07:33:48 -28.0 Dark Up 29.1 213.3 Low 07:18:48 - 07:48:48 3983
Carson City 07:33:47 -28.3 Dark Up 29.4 213.4 Low 07:18:47 - 07:48:47 3962
Yerington 07:33:44 -28.6 Dark Up 29.3 214.1 Low 07:18:44 - 07:48:44 3954
Gardnerville 07:33:47 -28.6 Dark Up 29.6 213.5 Low 07:18:47 - 07:48:47 3948
Hawthorne 07:33:41 -29.1 Dark Up 29.5 214.8 Low 07:18:41 - 07:48:41 3929
Tonopah 07:33:33 -29.6 Dark Up 29.2 216.3 Low 07:18:33 - 07:48:33 3906
Lee Vining 07:33:41 -29.6 Dark Up 30.2 214.4 Up 07:18:41 - 07:48:41 3892
Bishop 07:33:38 -30.3 Dark Up 30.3 215.4 Up 07:18:38 - 07:48:38 3859
Beatty 07:33:29 -30.8 Dark Up 29.9 217.1 Low 07:18:29 - 07:48:29 3837
Indian Springs 07:33:24 -31.2 Dark Up 29.7 218.2 Low 07:18:24 - 07:48:24 3820
Lone Pine 07:33:34 -31.0 Dark Up 30.8 215.9 Up 07:18:34 - 07:48:34 3813
Henderson 07:33:20 -31.7 Dark Up 29.8 219.0 Low 07:18:20 - 07:48:20 3789
Searchlight/Boulder City 07:33:18 -32.3 Dark Up 30.2 219.3 Up 07:18:18 - 07:48:18 3752
Patrick 07:33:14 -32.4 Dark Up 29.7 220.3 Low 07:18:14 - 07:48:14 3751
Kingman/Dolan Springs 07:33:14 -32.6 Dark Up 29.9 220.2 Low 07:18:14 - 07:48:14 3736
Laughlin/Bullhead City 07:33:16 -32.6 Dark Up 30.2 219.7 Up 07:18:16 - 07:48:16 3734
DCO 07:33:11 -32.7 Dark Up 29.5 221.1 Low 07:18:11 - 07:48:11 3733
CPSLO 07:33:41 -32.1 Dark Up 33.0 213.8 Up 07:18:41 - 07:48:41 3716
Mohave Valley 07:33:15 -32.9 Dark Up 30.4 219.8 Up 07:18:15 - 07:48:15 3716
Lake Havasu City 07:33:13 -33.3 Dark Up 30.6 220.2 Up 07:18:13 - 07:48:13 3690
Parker 07:33:12 -33.6 Dark Up 30.9 220.4 Up 07:18:12 - 07:48:12 3667
Wildwood 07:33:30 -33.5 Dark Up 33.1 216.3 Up 07:18:30 - 07:48:30 3647
Idyllwild 07:33:21 -34.0 Dark Up 32.4 218.3 Up 07:18:21 - 07:48:21 3631
Blythe 07:33:12 -34.1 Dark Up 31.4 220.3 Up 07:18:12 - 07:48:12 3631
Calipatria 07:33:15 -34.6 Dark Up 32.3 219.6 Up 07:18:15 - 07:48:15 3594
Yuma 07:33:10 -35.1 Dark Up 32.2 220.6 Up 07:18:10 - 07:48:10 3567

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 07:35UT)
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 -14:31:45  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 2019/06/08 11:53:50 UT

Marc W. Buie, Southwest Research Institute

RECON