RECON: TNO occultation with 148780

Event between (148780) Altjira and star GA1180:01371569 with event index number of 1467907

Geocentric closest approach at 2025/10/30 05:10:42 UTC

J2000 position of star is 05:20:40.3 +28:19:10
Equinox of date position of star is 05:21:55.8 +28:20:17
Stellar brightness G=13.7, use SENSEUP=64
Star is 128 degrees from the moon. Moon is 56% illuminated.
TNO apparent brightness V=22.5

[RECON map]
TNO is 46.2 AU from the Sun and 45.5 AU from the Earth.
The TNO is moving 17.5 km/sec on the sky relative to the star, or, 1.9 arcsec/hr.
The 1-sigma error in the time of the event is 962 seconds.
The 1-sigma cross-track error in the shadow position is 2358 km.
The sky-plane scale is 33026.5 km/arcsec.

The TNO has an absolute magnitude Hv=5.8
Diameter=416.9 km assuming a 5% albedo -- 23.8 sec chord
Diameter=170.2 km assuming a 30% albedo -- 9.7 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 148780, (2025/10/30 05:11UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.3 +16:33:34  0.8 15.68 116
Alnath         05:27:55.6 +28:37:37  1.6  1.27 129
PPM 094294     05:22:36.8 +27:58:51  6.3  0.37 128
PPM 094295     05:22:39.6 +28:09:23  9.6  0.20 128
148780         05:22:18.1 +28:20:36 13.7       128
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 0.9 sigma about the mid-time.
The median site spacing is 20.8 km RECON observability=1.0 and success probability=13.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Victoria 05:14:56 -41.9 Dark Up 23.3 73.0 Low 04:59:56 - 05:29:56 3771
Clarence Fulton 05:14:46 -43.1 Dark Up 26.3 76.5 Low 04:59:46 - 05:29:46 3757
Kelowna 05:14:48 -43.2 Dark Up 26.1 76.2 Low 04:59:48 - 05:29:48 3734
Summerland 05:14:50 -43.3 Dark Up 25.9 76.0 Low 04:59:50 - 05:29:50 3722
Penticton 05:14:49 -43.4 Dark Up 26.0 76.0 Low 04:59:49 - 05:29:49 3713
Oliver 05:14:51 -43.6 Dark Up 25.9 75.8 Low 04:59:51 - 05:29:51 3687
Anarchist Mountain Observatory 05:14:52 -43.8 Dark Up 26.0 75.9 Low 04:59:52 - 05:29:52 3668
Tonasket 05:14:53 -44.0 Dark Up 25.9 75.7 Low 04:59:53 - 05:29:53 3647
Okanogan 05:14:55 -44.1 Dark Up 25.7 75.5 Low 04:59:55 - 05:29:55 3628
Brewster 05:14:56 -44.1 Dark Up 25.5 75.2 Low 04:59:56 - 05:29:56 3614
Manson/Chelan 05:14:58 -44.1 Dark Up 25.2 74.9 Low 04:59:58 - 05:29:58 3612
Entiat 05:14:58 -44.1 Dark Up 25.1 74.7 Low 04:59:58 - 05:29:58 3598
Wenatchee 05:15:00 -44.2 Dark Up 25.0 74.5 Low 05:00:00 - 05:30:00 3582
Ellensburg 05:15:01 -44.4 Dark Up 24.7 74.2 Low 05:00:01 - 05:30:01 3559
Yakima 05:15:03 -44.6 Dark Up 24.6 74.0 Low 05:00:03 - 05:30:03 3529
Toppenish/White Swan 05:15:04 -44.8 Dark Up 24.7 74.0 Low 05:00:04 - 05:30:04 3506
Goldendale 05:15:07 -44.9 Dark Up 24.2 73.5 Low 05:00:07 - 05:30:07 3479
The Dalles 05:15:08 -44.8 Dark Up 23.9 73.2 Low 05:00:08 - 05:30:08 3475
Pasco 05:15:04 -45.6 Dark Up 25.5 74.8 Low 05:00:04 - 05:30:04 3451
Maupin 05:15:10 -45.0 Dark Up 23.9 73.1 Low 05:00:10 - 05:30:10 3439
PNWRO 05:15:05 -45.9 Dark Up 25.6 74.8 Low 05:00:05 - 05:30:05 3424
Sisters 05:15:14 -45.2 Dark Up 23.3 72.5 Low 05:00:14 - 05:30:14 3390
Redmond 05:15:13 -45.5 Dark Up 23.6 72.7 Low 05:00:13 - 05:30:13 3373
Bend 05:15:14 -45.5 Dark Up 23.4 72.5 Low 05:00:14 - 05:30:14 3362
Oregon Observatory 05:15:15 -45.5 Dark Up 23.3 72.4 Low 05:00:15 - 05:30:15 3353
La Pine/Gilchrist 05:15:16 -45.6 Dark Up 23.2 72.2 Low 05:00:16 - 05:30:16 3339
North Lake 05:15:18 -46.2 Dark Up 23.5 72.4 Low 05:00:18 - 05:30:18 3282
Klamath Falls 05:15:22 -46.1 Dark Up 22.5 71.5 Low 05:00:22 - 05:30:22 3235
Paisley 05:15:19 -46.7 Dark Up 23.5 72.4 Low 05:00:19 - 05:30:19 3225
Lakeview 05:15:22 -47.1 Dark Up 23.5 72.3 Low 05:00:22 - 05:30:22 3177
Fall River/Burney 05:15:27 -46.9 Dark Up 22.4 71.3 Low 05:00:27 - 05:30:27 3125
Cedarville 05:15:24 -47.5 Dark Up 23.5 72.2 Low 05:00:24 - 05:30:24 3117
Susanville 05:15:29 -47.7 Dark Up 22.8 71.4 Low 05:00:29 - 05:30:29 3045
Greenville 05:15:30 -47.7 Dark Up 22.5 71.2 Low 05:00:30 - 05:30:30 3034
Gimple 05:15:30 -47.7 Dark Up 22.5 71.2 Low 05:00:30 - 05:30:30 3030
Quincy 05:15:31 -47.8 Dark Up 22.4 71.1 Low 05:00:31 - 05:30:31 3017
Portola 05:15:31 -48.2 Dark Up 22.7 71.3 Low 05:00:31 - 05:30:31 2988
Reno 05:15:31 -48.7 Dark Up 23.1 71.6 Low 05:00:31 - 05:30:31 2940
Carson City 05:15:33 -48.9 Dark Up 23.0 71.4 Low 05:00:33 - 05:30:33 2909
Gardnerville 05:15:34 -49.1 Dark Up 23.0 71.4 Low 05:00:34 - 05:30:34 2886
Yerington 05:15:33 -49.4 Dark Up 23.4 71.7 Low 05:00:33 - 05:30:33 2867
Hawthorne 05:15:34 -50.0 Dark Up 23.7 71.8 Low 05:00:34 - 05:30:34 2806
Lee Vining 05:15:37 -50.0 Dark Up 23.1 71.3 Low 05:00:37 - 05:30:37 2778
Tonopah 05:15:34 -51.2 Dark Up 24.6 72.3 Low 05:00:34 - 05:30:34 2710
Bishop 05:15:38 -50.7 Dark Up 23.5 71.4 Low 05:00:38 - 05:30:38 2697
CPSLO 05:15:47 -50.0 Dark Up 21.1 69.5 Low 05:00:47 - 05:30:47 2613
Beatty 05:15:38 -52.1 Dark Up 24.6 72.0 Low 05:00:38 - 05:30:38 2590
Indian Springs 05:15:38 -53.0 Dark Up 25.3 72.4 Low 05:00:38 - 05:30:38 2518
Henderson 05:15:39 -53.8 Dark Up 25.7 72.5 Low 05:00:39 - 05:30:39 2442
Niwot 05:15:10 -57.3 Dark Up 34.1 79.7 Up 05:00:10 - 05:30:10 2432
SwRI 05:15:10 -57.3 Dark Up 34.0 79.6 Up 05:00:10 - 05:30:10 2426
Wildwood 05:15:49 -52.0 Dark Up 22.3 70.0 Low 05:00:49 - 05:30:49 2420
Searchlight/Boulder City 05:15:41 -54.1 Dark Up 25.6 72.3 Low 05:00:41 - 05:30:41 2388
Laughlin/Bullhead City 05:15:42 -54.5 Dark Up 25.8 72.3 Low 05:00:42 - 05:30:42 2347
Patrick 05:15:40 -54.9 Dark Up 26.4 72.7 Low 05:00:40 - 05:30:40 2340
Kingman/Dolan Springs 05:15:41 -54.9 Dark Up 26.2 72.5 Low 05:00:41 - 05:30:41 2328
Mohave Valley 05:15:42 -54.6 Dark Up 25.7 72.2 Low 05:00:42 - 05:30:42 2322
Idyllwild 05:15:49 -53.6 Dark Up 23.7 70.7 Low 05:00:49 - 05:30:49 2308
DCO 05:15:39 -55.5 Dark Up 26.8 72.9 Low 05:00:39 - 05:30:39 2284
Lake Havasu City 05:15:43 -55.0 Dark Up 25.8 72.1 Low 05:00:43 - 05:30:43 2276
Parker 05:15:44 -55.2 Dark Up 25.7 71.9 Low 05:00:44 - 05:30:44 2243
Blythe 05:15:46 -55.2 Dark Up 25.3 71.6 Low 05:00:46 - 05:30:46 2208
Calipatria 05:15:49 -54.8 Dark Up 24.4 71.0 Low 05:00:49 - 05:30:49 2202
Yuma 05:15:49 -55.6 Dark Up 25.0 71.2 Low 05:00:49 - 05:30:49 2125
George/Scottsdale 05:15:43 -57.2 Dark Up 27.5 72.8 Low 05:00:43 - 05:30:43 2104

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 148780, (2025/10/30 05:11UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 15.68 116
Alnath         05:26:17.5 +28:36:23  1.6  1.27 129
PPM 094294     05:20:59.3 +27:57:25  6.3  0.37 128
PPM 094295     05:21:02.0 +28:07:57  9.6  0.20 128
148780         05:20:40.3 +28:19:10 13.7       128
Positions are for J2000

Event circumstances last updated at 2019/12/10 23:14:49 UT

Marc W. Buie, Southwest Research Institute

RECON