RECON: TNO occultation with 04UD10

Event between 04UD10 and star GA1120:00788085 with event index number of 1453057

Geocentric closest approach at 2025/12/11 11:05:16 UTC

J2000 position of star is 04:47:25.4 +23:33:13
Equinox of date position of star is 04:48:35.9 +23:35:14
Stellar brightness G=16.0, use SENSEUP=128
Star is 92 degrees from the moon. Moon is 54% illuminated.
TNO apparent brightness V=23.1

[RECON map]
TNO is 44.4 AU from the Sun and 43.4 AU from the Earth.
The TNO is moving 25.7 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 642 seconds.
The 1-sigma cross-track error in the shadow position is 3490 km.
The sky-plane scale is 31495.0 km/arcsec.

The TNO has an absolute magnitude Hv=6.7
Diameter=280.6 km assuming a 5% albedo -- 10.9 sec chord
Diameter=114.5 km assuming a 30% albedo -- 4.5 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 04UD10, (2025/12/11 11:05UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.7 +16:33:35  0.8  7.54  95
3Iot Aur       04:58:41.2 +33:12:17  2.7  9.84  88
PPM 093742     04:47:16.7 +23:40:25  6.1  0.40  92
PPM 093751     04:47:56.9 +23:43:13  9.6  0.27  92
04UD10         04:48:59.6 +23:35:54 16.0        91
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 1.4 sigma about the mid-time.
The median site spacing is 21.3 km RECON observability=1.0 and success probability=8.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 11:02:51 -44.1 Dark Up 40.2 259.0 Up 10:47:51 - 11:17:51 -3506
Summerland 11:02:51 -44.4 Dark Up 40.4 259.0 Up 10:47:51 - 11:17:51 -3539
Penticton 11:02:50 -44.3 Dark Up 40.4 259.1 Up 10:47:50 - 11:17:50 -3543
Okanagan Falls 11:02:50 -44.4 Dark Up 40.4 259.3 Up 10:47:50 - 11:17:50 -3562
Oliver 11:02:49 -44.4 Dark Up 40.4 259.4 Up 10:47:49 - 11:17:49 -3576
Anarchist Mountain Observatory 11:02:49 -44.4 Dark Up 40.3 259.7 Up 10:47:49 - 11:17:49 -3589
Oroville 11:02:49 -44.4 Dark Up 40.4 259.7 Up 10:47:49 - 11:17:49 -3597
Tonasket 11:02:48 -44.5 Dark Up 40.4 259.9 Up 10:47:48 - 11:17:48 -3619
Okanogan 11:02:47 -44.7 Dark Up 40.6 260.1 Up 10:47:47 - 11:17:47 -3654
Brewster 11:02:48 -44.9 Dark Up 40.8 260.1 Up 10:47:48 - 11:17:48 -3683
Manson/Chelan 11:02:48 -45.2 Dark Up 41.1 260.0 Up 10:47:48 - 11:17:48 -3710
Entiat 11:02:47 -45.3 Dark Up 41.1 260.1 Up 10:47:47 - 11:17:47 -3732
Wenatchee 11:02:47 -45.4 Dark Up 41.3 260.3 Up 10:47:47 - 11:17:47 -3758
Ellensburg 11:02:46 -45.7 Dark Up 41.5 260.5 Up 10:47:46 - 11:17:46 -3802
Yakima 11:02:46 -45.8 Dark Up 41.6 260.8 Up 10:47:46 - 11:17:46 -3842
Pasco 11:02:42 -45.0 Dark Up 40.6 262.2 Up 10:47:42 - 11:17:42 -3846
Toppenish/White Swan 11:02:45 -45.8 Dark Up 41.5 261.1 Up 10:47:45 - 11:17:45 -3859
PNWRO 11:02:41 -44.9 Dark Up 40.5 262.6 Up 10:47:41 - 11:17:41 -3865
George/Umatilla 11:02:42 -45.2 Dark Up 40.8 262.4 Up 10:47:42 - 11:17:42 -3883
Goldendale 11:02:45 -46.2 Dark Up 41.9 261.3 Up 10:47:45 - 11:17:45 -3921
The Dalles 11:02:45 -46.5 Dark Up 42.1 261.2 Up 10:47:45 - 11:17:45 -3950
Maupin 11:02:44 -46.5 Dark Up 42.1 261.6 Up 10:47:44 - 11:17:44 -3988
Madras/Culver 11:02:43 -46.7 Dark Up 42.2 262.1 Up 10:47:43 - 11:17:43 -4043
Redmond 11:02:42 -46.8 Dark Up 42.3 262.3 Up 10:47:42 - 11:17:42 -4079
Sisters 11:02:43 -47.1 Dark Up 42.6 262.0 Up 10:47:43 - 11:17:43 -4084
Niwot 11:02:07 -35.6 Dark Up 30.6 276.2 Up 10:47:07 - 11:17:07 -4102
Bend 11:02:42 -47.0 Dark Up 42.5 262.4 Up 10:47:42 - 11:17:42 -4103
SwRI 11:02:07 -35.7 Dark Up 30.7 276.2 Up 10:47:07 - 11:17:07 -4115
Oregon Observatory 11:02:42 -47.1 Dark Up 42.6 262.5 Up 10:47:42 - 11:17:42 -4123
La Pine/Gilchrist 11:02:42 -47.2 Dark Up 42.6 262.6 Up 10:47:42 - 11:17:42 -4144
North Lake 11:02:40 -46.9 Dark Up 42.3 263.5 Up 10:47:40 - 11:17:40 -4175
Paisley 11:02:38 -46.8 Dark Up 42.1 264.2 Up 10:47:38 - 11:17:38 -4222
Chiloquin 11:02:40 -47.7 Dark Up 43.0 263.4 Up 10:47:40 - 11:17:40 -4261
Lakeview 11:02:36 -46.7 Dark Up 42.0 264.8 Up 10:47:36 - 11:17:36 -4269
Klamath Falls 11:02:40 -47.7 Dark Up 43.0 263.7 Up 10:47:40 - 11:17:40 -4294
Tulelake 11:02:38 -47.6 Dark Up 42.8 264.2 Up 10:47:38 - 11:17:38 -4315
Cedarville 11:02:35 -46.7 Dark Up 41.9 265.5 Up 10:47:35 - 11:17:35 -4331
Fall River/Burney 11:02:37 -47.7 Dark Up 42.9 265.1 Up 10:47:37 - 11:17:37 -4405
Susanville 11:02:34 -47.3 Dark Up 42.4 266.2 Up 10:47:34 - 11:17:34 -4453
Gimple 11:02:34 -47.5 Dark Up 42.5 266.3 Up 10:47:34 - 11:17:34 -4485
Greenville 11:02:34 -47.5 Dark Up 42.6 266.3 Up 10:47:34 - 11:17:34 -4487
Quincy 11:02:35 -47.6 Dark Up 42.6 266.4 Up 10:47:35 - 11:17:35 -4507
Portola 11:02:33 -47.2 Dark Up 42.3 266.9 Up 10:47:33 - 11:17:33 -4510
Reno 11:02:31 -46.8 Dark Up 41.8 267.6 Up 10:47:31 - 11:17:31 -4523
Carson City 11:02:30 -46.8 Dark Up 41.8 267.9 Up 10:47:30 - 11:17:30 -4559
Yerington 11:02:29 -46.4 Dark Up 41.3 268.5 Up 10:47:29 - 11:17:29 -4564
Gardnerville 11:02:30 -46.8 Dark Up 41.7 268.1 Up 10:47:30 - 11:17:30 -4582
Hawthorne 11:02:26 -46.0 Dark Up 40.9 269.2 Up 10:47:26 - 11:17:26 -4600
Tonopah 11:02:23 -44.9 Dark Up 39.8 270.5 Up 10:47:23 - 11:17:23 -4614
Lee Vining 11:02:26 -46.4 Dark Up 41.3 269.4 Up 10:47:26 - 11:17:26 -4668
Bishop 11:02:24 -45.9 Dark Up 40.7 270.4 Up 10:47:24 - 11:17:24 -4713
Beatty 11:02:20 -44.7 Dark Up 39.4 271.7 Up 10:47:20 - 11:17:20 -4721
Indian Springs 11:02:17 -43.8 Dark Up 38.6 272.6 Up 10:47:17 - 11:17:17 -4728
Henderson 11:02:15 -43.3 Dark Up 38.0 273.4 Up 10:47:15 - 11:17:15 -4765
Lone Pine 11:02:22 -45.7 Dark Up 40.5 271.2 Up 10:47:22 - 11:17:22 -4783
Patrick 11:02:12 -42.4 Dark Up 37.0 274.5 Up 10:47:12 - 11:17:12 -4801
DCO 11:02:10 -41.8 Dark Up 36.4 275.1 Up 10:47:10 - 11:17:10 -4813
Searchlight/Boulder City 11:02:14 -43.3 Dark Up 37.9 273.9 Up 10:47:14 - 11:17:14 -4822
Kingman/Dolan Springs 11:02:12 -42.6 Dark Up 37.2 274.5 Up 10:47:12 - 11:17:12 -4828
Laughlin/Bullhead City 11:02:13 -43.0 Dark Up 37.6 274.3 Up 10:47:13 - 11:17:13 -4844
Mohave Valley 11:02:12 -43.0 Dark Up 37.6 274.5 Up 10:47:12 - 11:17:12 -4871
Lake Havasu City 11:02:12 -42.8 Dark Up 37.3 274.9 Up 10:47:12 - 11:17:12 -4906
Parker 11:02:11 -42.7 Dark Up 37.3 275.2 Up 10:47:11 - 11:17:11 -4941
CPSLO 11:02:26 -47.9 Dark Up 42.5 270.9 Up 10:47:26 - 11:17:26 -4976
Blythe 11:02:11 -43.0 Dark Up 37.5 275.4 Up 10:47:11 - 11:17:11 -5003
Idyllwild 11:02:15 -44.7 Dark Up 39.2 274.3 Up 10:47:15 - 11:17:15 -5045
Wildwood 11:02:19 -46.3 Dark Up 40.8 273.0 Up 10:47:19 - 11:17:19 -5054
Calipatria 11:02:11 -43.8 Dark Up 38.2 275.4 Up 10:47:11 - 11:17:11 -5078
Yuma 11:02:09 -43.0 Dark Up 37.4 276.1 Up 10:47:09 - 11:17:09 -5099

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 04UD10, (2025/12/11 11:05UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8  7.54  95
3Iot Aur       04:56:59.6 +33:09:58  2.7  9.84  88
PPM 093742     04:45:42.5 +23:37:41  6.1  0.40  92
PPM 093751     04:46:22.7 +23:40:30  9.6  0.27  92
04UD10         04:47:25.4 +23:33:13 16.0        92
Positions are for J2000

Event circumstances last updated at 2019/06/08 13:16:31 UT

Marc W. Buie, Southwest Research Institute

RECON