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 05:36:27 UTC

J2000 position of star is 05:35:18.4 +25:39:31
Equinox of date position of star is 05:36:33.6 +25:40:13
Stellar brightness G=15.3, use SENSEUP=128
Star is 101 degrees from the moon. Moon is 30% illuminated.
TNO apparent brightness V=26.3

[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 813 seconds.
The 1-sigma cross-track error in the shadow position is 3714 km.
The sky-plane scale is 30154.7 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=197.7 km assuming a 5% albedo -- 2.4 sec chord
Diameter=80.7 km assuming a 30% albedo -- 1.0 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 03UN284, (2026/12/03 05:36UT)
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  0.63 101
PPM 094532     05:37:14.9 +25:53:10  9.9  0.22 101
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 1.1 sigma about the mid-time.
The median site spacing is 24.1 km RECON observability=1.0 and success probability=4.6%
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 05:38:26 -52.3 Dark Down 46.9 107.1 Up 05:23:26 - 05:53:26 8685
Kelowna 05:38:26 -52.4 Dark Down 46.9 106.5 Up 05:23:26 - 05:53:26 8654
Peachland 05:38:27 -52.3 Dark Down 46.8 106.1 Up 05:23:27 - 05:53:27 8652
Summerland 05:38:27 -52.5 Dark Down 46.9 106.1 Up 05:23:27 - 05:53:27 8636
Victoria 05:38:37 -51.0 Dark Down 44.8 101.6 Up 05:23:37 - 05:53:37 8633
Penticton 05:38:28 -52.6 Dark Down 46.9 106.1 Up 05:23:28 - 05:53:28 8627
Oliver 05:38:29 -52.8 Dark Down 47.0 105.7 Up 05:23:29 - 05:53:29 8596
Anarchist Mountain Observatory 05:38:28 -53.0 Dark Down 47.2 105.7 Up 05:23:28 - 05:53:28 8576
Tonasket 05:38:29 -53.1 Dark Down 47.2 105.4 Up 05:23:29 - 05:53:29 8550
Okanogan 05:38:30 -53.2 Dark Down 47.2 104.9 Up 05:23:30 - 05:53:30 8524
Brewster 05:38:32 -53.3 Dark Down 47.2 104.4 Up 05:23:32 - 05:53:32 8504
Manson/Chelan 05:38:33 -53.2 Dark Down 47.0 103.9 Up 05:23:33 - 05:53:33 8494
Entiat 05:38:33 -53.3 Dark Down 47.0 103.6 Up 05:23:33 - 05:53:33 8476
Wenatchee 05:38:34 -53.3 Dark Down 47.0 103.2 Up 05:23:34 - 05:53:34 8456
Ellensburg 05:38:36 -53.4 Dark Down 47.0 102.6 Up 05:23:36 - 05:53:36 8424
Yakima 05:38:37 -53.6 Dark Down 47.0 102.1 Up 05:23:37 - 05:53:37 8387
Toppenish/White Swan 05:38:37 -53.9 Dark Down 47.2 102.1 Up 05:23:37 - 05:53:37 8363
Goldendale 05:38:40 -53.9 Dark Down 47.0 101.1 Up 05:23:40 - 05:53:40 8324
Pasco 05:38:35 -54.7 Dark Down 48.1 103.1 Up 05:23:35 - 05:53:35 8320
The Dalles 05:38:41 -53.8 Dark Down 46.8 100.6 Up 05:23:41 - 05:53:41 8313
PNWRO 05:38:35 -54.9 Dark Down 48.3 103.0 Up 05:23:35 - 05:53:35 8291
Maupin 05:38:42 -54.0 Dark Down 47.0 100.2 Up 05:23:42 - 05:53:42 8271
Sisters 05:38:45 -54.1 Dark Down 46.8 98.9 Up 05:23:45 - 05:53:45 8203
Redmond 05:38:44 -54.4 Dark Down 47.1 99.2 Up 05:23:44 - 05:53:44 8190
Bend 05:38:45 -54.4 Dark Down 47.0 98.9 Up 05:23:45 - 05:53:45 8174
Oregon Observatory 05:38:45 -54.4 Dark Down 46.9 98.6 Up 05:23:45 - 05:53:45 8162
La Pine/Gilchrist 05:38:46 -54.5 Dark Down 46.9 98.3 Up 05:23:46 - 05:53:46 8144
North Lake 05:38:46 -55.1 Dark Down 47.4 98.3 Up 05:23:46 - 05:53:46 8087
Paisley 05:38:46 -55.5 Dark Down 47.8 98.0 Up 05:23:46 - 05:53:46 8025
Klamath Falls 05:38:50 -54.9 Dark Down 46.9 96.6 Up 05:23:50 - 05:53:50 8016
Lakeview 05:38:47 -55.9 Dark Down 48.0 97.6 Up 05:23:47 - 05:53:47 7972
Cedarville 05:38:48 -56.3 Dark Down 48.2 97.0 Up 05:23:48 - 05:53:48 7905
Fall River/Burney 05:38:52 -55.7 Dark Down 47.3 95.6 Up 05:23:52 - 05:53:52 7893
Susanville 05:38:52 -56.4 Dark Down 48.0 95.5 Up 05:23:52 - 05:53:52 7811
Greenville 05:38:53 -56.3 Dark Down 47.8 94.9 Up 05:23:53 - 05:53:53 7793
Gimple 05:38:52 -56.4 Dark Down 47.8 95.0 Up 05:23:52 - 05:53:52 7791
Quincy 05:38:53 -56.4 Dark Down 47.8 94.7 Up 05:23:53 - 05:53:53 7774
Portola 05:38:53 -56.8 Dark Down 48.2 94.9 Up 05:23:53 - 05:53:53 7748
Reno 05:38:52 -57.3 Dark Down 48.7 95.1 Up 05:23:52 - 05:53:52 7704
Carson City 05:38:53 -57.5 Dark Down 48.7 94.7 Up 05:23:53 - 05:53:53 7668
Gardnerville 05:38:53 -57.6 Dark Down 48.8 94.5 Up 05:23:53 - 05:53:53 7643
Yerington 05:38:52 -58.0 Dark Down 49.2 94.9 Up 05:23:52 - 05:53:52 7631
Hawthorne 05:38:51 -58.6 Dark Down 49.7 94.7 Up 05:23:51 - 05:53:51 7571
Lee Vining 05:38:54 -58.4 Dark Down 49.3 93.8 Up 05:23:54 - 05:53:54 7529
Tonopah 05:38:49 -59.8 Dark Down 50.8 95.2 Up 05:23:49 - 05:53:49 7485
Bishop 05:38:53 -59.2 Dark Down 50.0 93.5 Up 05:23:53 - 05:53:53 7449
Niwot 05:38:12 -66.4 Dark Down 59.5 108.3 Up 05:23:12 - 05:53:12 7394
SwRI 05:38:14 -66.4 Dark Down 59.4 108.0 Up 05:23:14 - 05:53:14 7386
Beatty 05:38:50 -60.6 Dark Down 51.3 94.1 Up 05:23:50 - 05:53:50 7357
CPSLO 05:39:03 -58.1 Dark Down 48.2 89.8 Up 05:24:03 - 05:54:03 7312
Indian Springs 05:38:48 -61.5 Dark Down 52.2 94.4 Up 05:23:48 - 05:53:48 7294
Henderson 05:38:47 -62.2 Dark Down 52.8 94.1 Up 05:23:47 - 05:53:47 7221
Searchlight/Boulder City 05:38:48 -62.5 Dark Down 52.8 93.4 Up 05:23:48 - 05:53:48 7161
Wildwood 05:39:00 -60.1 Dark Down 49.9 89.5 Up 05:24:00 - 05:54:00 7128
Patrick 05:38:45 -63.3 Dark Down 53.7 94.0 Up 05:23:45 - 05:53:45 7127
Laughlin/Bullhead City 05:38:47 -62.8 Dark Down 53.1 93.3 Up 05:23:47 - 05:53:47 7121
Kingman/Dolan Springs 05:38:46 -63.2 Dark Down 53.6 93.6 Up 05:23:46 - 05:53:46 7109
Mohave Valley 05:38:48 -62.9 Dark Down 53.2 92.9 Up 05:23:48 - 05:53:48 7093
DCO 05:38:43 -63.9 Dark Down 54.3 94.1 Up 05:23:43 - 05:53:43 7076
Lake Havasu City 05:38:48 -63.3 Dark Down 53.4 92.5 Up 05:23:48 - 05:53:48 7046
Idyllwild 05:38:55 -61.7 Dark Down 51.5 90.1 Up 05:23:55 - 05:53:55 7037
Parker 05:38:49 -63.4 Dark Down 53.4 92.1 Up 05:23:49 - 05:53:49 7009
Blythe 05:38:50 -63.4 Dark Down 53.2 91.2 Up 05:23:50 - 05:53:50 6964
Calipatria 05:38:53 -62.8 Dark Down 52.4 90.0 Up 05:23:53 - 05:53:53 6940
George/Scottsdale 05:38:42 -65.4 Dark Down 55.4 92.9 Up 05:23:42 - 05:53:42 6899
Yuma 05:38:51 -63.6 Dark Down 53.2 89.9 Up 05:23:51 - 05:53:51 6870

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 05:36UT)
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  0.63 101
PPM 094532     05:35:34.8 +25:52:15  9.9  0.22 101
03UN284        05:35:18.4 +25:39:31 15.3       101
Positions are for J2000

Event circumstances last updated at 2020/04/03 21:38:38 UT

Marc W. Buie, Southwest Research Institute

RECON