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 11:05:15 UTC

J2000 position of star is 04:47:25.4 +23:33:13
Equinox of date position of star is 04:48:52.0 +23:35:41
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 92 degrees from the moon. Moon is 54% illuminated.
Apparent brightness V=23.1

[RECON map]
Object is 44.4 AU from the Sun and 43.4 AU from the Earth.
Apparent velocity is 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 643 seconds.
The 1-sigma cross-track error in the shadow position is 3485 km.
The sky-plane scale is 31495.0 km/arcsec.

The object 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 +16:33:34  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 24.9 km RECON observability=1.0 and success probability=12.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 11:02:38 -35.4 Dark Up 31.6 268.5 Up 10:47:38 - 11:17:38 -3036
Kamloops 11:02:54 -44.4 Dark Up 40.6 257.5 Up 10:47:54 - 11:17:54 -3452
Kelowna 11:02:51 -44.2 Dark Up 40.2 259.0 Up 10:47:51 - 11:17:51 -3511
Peachland 11:02:51 -44.4 Dark Up 40.5 258.8 Up 10:47:51 - 11:17:51 -3527
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
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 -3588
Okanogan 11:02:48 -44.7 Dark Up 40.6 260.1 Up 10:47:48 - 11:17:48 -3654
Brewster 11:02:47 -44.9 Dark Up 40.8 260.1 Up 10:47:47 - 11:17:47 -3683
Victoria 11:02:55 -47.0 Dark Up 43.0 256.7 Up 10:47:55 - 11:17:55 -3708
Manson/Chelan 11:02:48 -45.2 Dark Up 41.1 260.0 Up 10:47:48 - 11:17:48 -3710
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 -3841
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
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
Sisters 11:02:43 -47.1 Dark Up 42.6 262.0 Up 10:47:43 - 11:17:43 -4084
Dunrhomin 11:02:07 -35.6 Dark Up 30.6 276.1 Up 10:47:07 - 11:17:07 -4088
Bend 11:02:42 -47.0 Dark Up 42.5 262.4 Up 10:47:42 - 11:17:42 -4102
Nikitin 11:02:07 -35.6 Dark Up 30.6 276.2 Up 10:47:07 - 11:17:07 -4106
CU-SBO 11:02:07 -35.7 Dark Up 30.7 276.2 Up 10:47:07 - 11:17:07 -4114
Oregon Observatory 11:02:42 -47.1 Dark Up 42.6 262.5 Up 10:47:42 - 11:17:42 -4122
Chiloquin 11:02:40 -47.7 Dark Up 43.0 263.4 Up 10:47:40 - 11:17:40 -4261
Klamath Falls 11:02:40 -47.7 Dark Up 43.0 263.7 Up 10:47:40 - 11:17:40 -4294
Cedarville 11:02:35 -46.7 Dark Up 41.9 265.5 Up 10:47:35 - 11:17:35 -4330
Fall River/Burney 11:02:37 -47.7 Dark Up 42.9 265.1 Up 10:47:37 - 11:17:37 -4404
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 -4486
Quincy 11:02:34 -47.6 Dark Up 42.6 266.4 Up 10:47:34 - 11:17:34 -4507
Portola 11:02:32 -47.2 Dark Up 42.3 266.9 Up 10:47:32 - 11:17:32 -4509
Reno 11:02:31 -46.8 Dark Up 41.8 267.6 Up 10:47:31 - 11:17:31 -4522
Carson City 11:02:30 -46.8 Dark Up 41.8 267.9 Up 10:47:30 - 11:17:30 -4558
Yerington 11:02:28 -46.4 Dark Up 41.3 268.5 Up 10:47:28 - 11:17:28 -4564
Gardnerville 11:02:29 -46.8 Dark Up 41.7 268.1 Up 10:47:29 - 11:17:29 -4582
Hawthorne 11:02:26 -46.0 Dark Up 40.9 269.2 Up 10:47:26 - 11:17:26 -4599
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 -4712
Beatty 11:02:20 -44.7 Dark Up 39.4 271.7 Up 10:47:20 - 11:17:20 -4721
Patrick 11:02:12 -42.4 Dark Up 37.0 274.5 Up 10:47:12 - 11:17:12 -4800
Laughlin/Bullhead City 11:02:13 -43.0 Dark Up 37.6 274.3 Up 10:47:13 - 11:17:13 -4844
Lake Havasu City 11:02:12 -42.8 Dark Up 37.3 274.9 Up 10:47:12 - 11:17:12 -4906
George/Scottsdale 11:02:05 -40.7 Dark Up 35.2 276.7 Up 10:47:05 - 11:17:05 -4920
Idyllwild 11:02:15 -44.7 Dark Up 39.2 274.3 Up 10:47:15 - 11:17:15 -5045
Wildwood 11:02:20 -46.3 Dark Up 40.8 273.0 Up 10:47:20 - 11:17:20 -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 +16:30:29  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 2023/11/15 03:55:35 UT

Marc W. Buie, Southwest Research Institute

RECON