RECON: TNO occultation with 03UN284

Event between 03UN284 and star GA1140:01306348 with event index number of 1637622

Geocentric closest approach at 2026/12/03 05:05:32 UTC

J2000 position of star is 05:35:18.4 +25:39:31
Equinox of date position of star is 05:36:32.2 +25:40:12
Stellar brightness G=15.3, use SENSEUP=128
Star is 101 degrees from the moon. Moon is 30% illuminated.
TNO apparent brightness V=23.7

[RECON map]
TNO is 42.5 AU from the Sun and 41.6 AU from the Earth.
The TNO is moving 24.8 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 912 seconds.
The 1-sigma cross-track error in the shadow position is 2409 km.
The sky-plane scale is 30155.7 km/arcsec.

The TNO has an absolute magnitude Hv=7.4
Diameter=197.7 km assuming a 5% albedo -- 8.0 sec chord
Diameter=80.7 km assuming a 30% albedo -- 3.3 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 03UN284, (2026/12/03 05:06UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:28.1 +16:33:41  0.8 16.58 115
Alnath         05:27:59.8 +28:37:40  1.6  3.57 103
125 Tau        05:41:24.4 +25:54:35  5.2  1.03 100
PPM 094544     05:37:43.2 +26:17:00  8.3  0.63 100
PPM 094532     05:37:14.9 +25:53:10  9.9  0.22 100
03UN284        05:36:58.4 +25:40:27 15.3       100
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 1.0 sigma about the mid-time.
The median site spacing is 22.5 km RECON observability=1.0 and success probability=19.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Clarence Fulton 05:07:44 -48.1 Dark Down 42.1 100.0 Up 04:52:44 - 05:22:44 2190
Kelowna 05:07:46 -48.2 Dark Down 42.1 99.5 Up 04:52:46 - 05:22:46 2162
Victoria 05:07:56 -46.4 Dark Down 39.7 95.1 Up 04:52:56 - 05:22:56 2155
Summerland 05:07:47 -48.2 Dark Down 42.0 99.1 Up 04:52:47 - 05:22:47 2145
Penticton 05:07:47 -48.3 Dark Down 42.1 99.2 Up 04:52:47 - 05:22:47 2136
Oliver 05:07:48 -48.5 Dark Down 42.1 98.9 Up 04:52:48 - 05:22:48 2106
Anarchist Mountain Observatory 05:07:48 -48.6 Dark Down 42.3 98.9 Up 04:52:48 - 05:22:48 2087
Tonasket 05:07:49 -48.7 Dark Down 42.3 98.5 Up 04:52:49 - 05:22:49 2062
Okanogan 05:07:50 -48.8 Dark Down 42.2 98.1 Up 04:52:50 - 05:22:50 2037
Brewster 05:07:51 -48.8 Dark Down 42.1 97.7 Up 04:52:51 - 05:22:51 2019
Manson/Chelan 05:07:52 -48.7 Dark Down 41.9 97.2 Up 04:52:52 - 05:22:52 2011
Entiat 05:07:53 -48.7 Dark Down 41.9 97.0 Up 04:52:53 - 05:22:53 1994
Wenatchee 05:07:54 -48.7 Dark Down 41.9 96.7 Up 04:52:54 - 05:22:54 1975
Ellensburg 05:07:56 -48.8 Dark Down 41.8 96.1 Up 04:52:56 - 05:22:56 1945
Yakima 05:07:56 -48.9 Dark Down 41.8 95.7 Up 04:52:56 - 05:22:56 1910
Toppenish/White Swan 05:07:57 -49.1 Dark Down 42.0 95.7 Up 04:52:57 - 05:22:57 1886
Goldendale 05:07:59 -49.1 Dark Down 41.7 94.9 Up 04:52:59 - 05:22:59 1850
The Dalles 05:08:00 -48.9 Dark Down 41.5 94.4 Up 04:53:00 - 05:23:00 1840
Pasco 05:07:55 -50.0 Dark Down 42.8 96.6 Up 04:52:55 - 05:22:55 1840
PNWRO 05:07:55 -50.2 Dark Down 43.0 96.5 Up 04:52:55 - 05:22:55 1811
Maupin 05:08:01 -49.1 Dark Down 41.6 94.1 Up 04:53:01 - 05:23:01 1800
Sisters 05:08:05 -49.1 Dark Down 41.3 93.0 Up 04:53:05 - 05:23:05 1737
Redmond 05:08:04 -49.4 Dark Down 41.6 93.3 Up 04:53:04 - 05:23:04 1723
Bend 05:08:05 -49.3 Dark Down 41.5 93.0 Up 04:53:05 - 05:23:05 1708
Oregon Observatory 05:08:05 -49.3 Dark Down 41.4 92.7 Up 04:53:05 - 05:23:05 1697
La Pine/Gilchrist 05:08:06 -49.3 Dark Down 41.4 92.5 Up 04:53:06 - 05:23:06 1680
North Lake 05:08:06 -49.9 Dark Down 41.8 92.5 Up 04:53:06 - 05:23:06 1623
Paisley 05:08:07 -50.3 Dark Down 42.1 92.3 Up 04:53:07 - 05:23:07 1562
Klamath Falls 05:08:10 -49.6 Dark Down 41.2 91.0 Up 04:53:10 - 05:23:10 1557
Lakeview 05:08:08 -50.6 Dark Down 42.3 92.0 Up 04:53:08 - 05:23:08 1510
Cedarville 05:08:09 -50.9 Dark Down 42.5 91.5 Up 04:53:09 - 05:23:09 1445
Fall River/Burney 05:08:13 -50.2 Dark Down 41.6 90.3 Up 04:53:13 - 05:23:13 1438
Susanville 05:08:13 -50.9 Dark Down 42.1 90.2 Up 04:53:13 - 05:23:13 1356
Greenville 05:08:14 -50.8 Dark Down 41.9 89.7 Up 04:53:14 - 05:23:14 1340
Gimple 05:08:14 -50.8 Dark Down 42.0 89.8 Up 04:53:14 - 05:23:14 1337
Quincy 05:08:14 -50.8 Dark Down 41.9 89.6 Up 04:53:14 - 05:23:14 1321
Portola 05:08:14 -51.2 Dark Down 42.3 89.8 Up 04:53:14 - 05:23:14 1294
Reno 05:08:13 -51.8 Dark Down 42.8 89.9 Up 04:53:13 - 05:23:13 1249
Carson City 05:08:14 -51.9 Dark Down 42.8 89.6 Up 04:53:14 - 05:23:14 1215
Gardnerville 05:08:14 -52.0 Dark Down 42.8 89.4 Up 04:53:14 - 05:23:14 1190
Yerington 05:08:13 -52.4 Dark Down 43.3 89.8 Up 04:53:13 - 05:23:13 1176
Hawthorne 05:08:13 -52.9 Dark Down 43.7 89.7 Up 04:53:13 - 05:23:13 1116
Lee Vining 05:08:16 -52.7 Dark Down 43.3 88.9 Up 04:53:16 - 05:23:16 1078
Tonopah 05:08:11 -54.1 Dark Down 44.8 90.1 Up 04:53:11 - 05:23:11 1027
Bishop 05:08:15 -53.4 Dark Down 43.9 88.7 Up 04:53:15 - 05:23:15 997
Beatty 05:08:13 -54.8 Dark Down 45.1 89.3 Up 04:53:13 - 05:23:13 901
Niwot 05:07:39 -61.8 Dark Down 53.8 101.1 Up 04:52:39 - 05:22:39 888
SwRI 05:07:39 -61.8 Dark Down 53.7 100.9 Up 04:52:39 - 05:22:39 880
CPSLO 05:08:25 -52.0 Dark Down 42.0 85.6 Up 04:53:25 - 05:23:25 873
Indian Springs 05:08:11 -55.7 Dark Down 46.0 89.6 Up 04:53:11 - 05:23:11 835
Henderson 05:08:11 -56.3 Dark Down 46.6 89.4 Up 04:53:11 - 05:23:11 761
Searchlight/Boulder City 05:08:12 -56.5 Dark Down 46.6 88.8 Up 04:53:12 - 05:23:12 703
Wildwood 05:08:23 -53.9 Dark Down 43.6 85.5 Up 04:53:23 - 05:23:23 687
Patrick 05:08:09 -57.4 Dark Down 47.5 89.4 Up 04:53:09 - 05:23:09 665
Laughlin/Bullhead City 05:08:12 -56.9 Dark Down 46.9 88.7 Up 04:53:12 - 05:23:12 663
Kingman/Dolan Springs 05:08:10 -57.3 Dark Down 47.3 89.0 Up 04:53:10 - 05:23:10 649
Mohave Valley 05:08:12 -57.0 Dark Down 46.9 88.4 Up 04:53:12 - 05:23:12 636
DCO 05:08:08 -58.0 Dark Down 48.0 89.4 Up 04:53:08 - 05:23:08 613
Idyllwild 05:08:19 -55.5 Dark Down 45.1 86.1 Up 04:53:19 - 05:23:19 589
Lake Havasu City 05:08:12 -57.2 Dark Down 47.1 88.1 Up 04:53:12 - 05:23:12 588
Parker 05:08:13 -57.3 Dark Down 47.1 87.8 Up 04:53:13 - 05:23:13 552
Blythe 05:08:15 -57.2 Dark Down 46.8 87.1 Up 04:53:15 - 05:23:15 509
Calipatria 05:08:18 -56.6 Dark Down 46.0 86.1 Up 04:53:18 - 05:23:18 490
George/Scottsdale 05:08:08 -59.4 Dark Down 49.1 88.6 Up 04:53:08 - 05:23:08 434
Yuma 05:08:17 -57.4 Dark Down 46.7 86.1 Up 04:53:17 - 05:23:17 418

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 03UN284, (2026/12/03 05:06UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 16.58 115
Alnath         05:26:17.5 +28:36:23  1.6  3.57 103
125 Tau        05:39:44.2 +25:53:49  5.2  1.03 100
PPM 094544     05:36:02.7 +26:16:05  8.3  0.63 100
PPM 094532     05:35:34.8 +25:52:15  9.9  0.22 100
03UN284        05:35:18.4 +25:39:31 15.3       101
Positions are for J2000

Event circumstances last updated at 2019/11/13 22:01:53 UT

Marc W. Buie, Southwest Research Institute

RECON