RECON: TNO occultation with 14UU228

Event between 14UU228 and star GA1100:00489411 with event index number of 1976174

Geocentric closest approach at 2026/12/15 08:37:34 UTC

J2000 position of star is 03:59:21.3 +21:18:02
Equinox of date position of star is 04:00:45.6 +21:22:02
Stellar brightness G=14.2, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 90 degrees from the moon. Moon is 32% illuminated.
Apparent brightness V=24.2

[RECON map]
Object is 27.9 AU from the Sun and 27.0 AU from the Earth.
Apparent velocity is 21.8 km/sec on the sky relative to the star, or, 4.0 arcsec/hr.
The 1-sigma error in the time of the event is 701 seconds.
The 1-sigma cross-track error in the shadow position is 3452 km.
The sky-plane scale is 19596.6 km/arcsec.

The object has an absolute magnitude Hv=9.7
Diameter=68.6 km assuming a 5% albedo -- 3.1 sec chord
Diameter=28.0 km assuming a 30% albedo -- 1.3 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 14UU228, (2026/12/15 08:38UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:28.2 +16:33:41  0.8  9.88  98
44Zet Per      03:55:50.0 +31:57:41  2.8 10.65  91
32 Tau         03:58:27.9 +22:33:13  5.6  1.31  90
PPM 093159     04:02:15.2 +20:29:14  8.4  0.94  90
PPM 093127     04:00:11.2 +21:13:25 10.0  0.23  90
14UU228        04:00:56.4 +21:22:32 14.2        90
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 1.3 sigma about the mid-time.
The median site spacing is 37.6 km RECON observability=1.0 and success probability=17.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 08:34:48 -55.8 Dark Down 42.6 247.8 Up 08:19:48 - 08:49:48 514
Kamloops 08:35:22 -61.6 Dark Down 51.1 233.2 Up 08:20:22 - 08:50:22 322
Kelowna 08:35:19 -62.1 Dark Down 51.1 235.1 Up 08:20:19 - 08:50:19 241
Peachland 08:35:19 -62.3 Dark Down 51.3 234.8 Up 08:20:19 - 08:50:19 229
Summerland 08:35:19 -62.4 Dark Down 51.4 235.1 Up 08:20:19 - 08:50:19 214
Penticton 08:35:19 -62.5 Dark Down 51.3 235.3 Up 08:20:19 - 08:50:19 208
Oliver 08:35:18 -62.8 Dark Down 51.5 235.7 Up 08:20:18 - 08:50:18 172
Anarchist Mountain Observatory 08:35:17 -62.9 Dark Down 51.5 236.1 Up 08:20:17 - 08:50:17 155
Victoria 08:35:29 -64.2 Dark Down 54.0 231.5 Up 08:20:29 - 08:50:29 107
Okanogan 08:35:17 -63.6 Dark Down 52.0 236.5 Up 08:20:17 - 08:50:17 89
Brewster 08:35:18 -63.9 Dark Down 52.3 236.5 Up 08:20:18 - 08:50:18 61
Manson/Chelan 08:35:19 -64.2 Dark Down 52.6 236.3 Up 08:20:19 - 08:50:19 40
Wenatchee 08:35:19 -64.6 Dark Down 53.0 236.6 Up 08:20:19 - 08:50:19 -9
Ellensburg 08:35:19 -65.1 Dark Down 53.3 236.8 Up 08:20:19 - 08:50:19 -51
Yakima 08:35:19 -65.5 Dark Down 53.5 237.2 Up 08:20:19 - 08:50:19 -93
Toppenish/White Swan 08:35:18 -65.6 Dark Down 53.6 237.7 Up 08:20:18 - 08:50:18 -116
PNWRO 08:35:13 -65.5 Dark Down 52.9 239.9 Up 08:20:13 - 08:50:13 -153
The Dalles 08:35:20 -66.5 Dark Down 54.4 237.6 Up 08:20:20 - 08:50:20 -196
Maupin 08:35:19 -66.9 Dark Down 54.6 238.3 Up 08:20:19 - 08:50:19 -240
Sisters 08:35:20 -67.9 Dark Down 55.4 238.7 Up 08:20:20 - 08:50:20 -331
Bend 08:35:19 -68.0 Dark Down 55.3 239.3 Up 08:20:19 - 08:50:19 -356
Oregon Observatory 08:35:19 -68.2 Dark Down 55.5 239.4 Up 08:20:19 - 08:50:19 -374
Chiloquin 08:35:19 -69.5 Dark Down 56.4 240.6 Up 08:20:19 - 08:50:19 -513
Klamath Falls 08:35:19 -69.8 Dark Down 56.5 241.1 Up 08:20:19 - 08:50:19 -549
Cedarville 08:35:13 -70.0 Dark Down 55.8 243.9 Up 08:20:13 - 08:50:13 -624
Fall River/Burney 08:35:17 -70.8 Dark Down 56.8 243.2 Up 08:20:17 - 08:50:17 -675
Dunrhomin 08:34:26 -63.2 Dark Down 45.6 259.4 Up 08:19:26 - 08:49:26 -691
Nikitin 08:34:26 -63.3 Dark Down 45.6 259.6 Up 08:19:26 - 08:49:26 -711
CU-SBO 08:34:26 -63.4 Dark Down 45.7 259.6 Up 08:19:26 - 08:49:26 -718
Greenville 08:35:15 -71.5 Dark Down 56.9 244.9 Up 08:20:15 - 08:50:15 -772
Gimple 08:35:15 -71.4 Dark Down 56.9 245.0 Up 08:20:15 - 08:50:15 -772
Quincy 08:35:15 -71.6 Dark Down 57.0 245.2 Up 08:20:15 - 08:50:15 -794
Portola 08:35:13 -71.6 Dark Down 56.7 245.9 Up 08:20:13 - 08:50:13 -807
Reno 08:35:11 -71.6 Dark Down 56.4 247.0 Up 08:20:11 - 08:50:11 -836
Carson City 08:35:10 -71.9 Dark Down 56.5 247.5 Up 08:20:10 - 08:50:10 -874
Yerington 08:35:08 -71.8 Dark Down 56.1 248.4 Up 08:20:08 - 08:50:08 -895
Gardnerville 08:35:10 -72.1 Dark Down 56.6 247.9 Up 08:20:10 - 08:50:10 -901
Hawthorne 08:35:06 -71.9 Dark Down 55.9 249.6 Up 08:20:06 - 08:50:06 -945
Lee Vining 08:35:07 -72.6 Dark Down 56.5 249.9 Up 08:20:07 - 08:50:07 -1006
Bishop 08:35:05 -72.7 Dark Down 56.1 251.5 Up 08:20:05 - 08:50:05 -1070
Beatty 08:34:59 -72.2 Dark Down 55.0 253.7 Up 08:19:59 - 08:49:59 -1118
Patrick 08:34:48 -71.5 Dark Down 53.2 258.1 Up 08:19:48 - 08:49:48 -1270
Laughlin/Bullhead City 08:34:50 -72.1 Dark Down 53.8 257.9 Up 08:19:50 - 08:49:50 -1300
Lake Havasu City 08:34:49 -72.3 Dark Down 53.7 259.0 Up 08:19:49 - 08:49:49 -1372
Wildwood 08:35:04 -75.3 Dark Down 57.2 256.1 Up 08:20:04 - 08:50:04 -1427
George/Scottsdale 08:34:40 -71.1 Dark Down 51.9 261.8 Up 08:19:40 - 08:49:40 -1446
Idyllwild 08:34:56 -74.4 Dark Down 55.8 258.2 Up 08:19:56 - 08:49:56 -1463
Calipatria 08:34:52 -73.9 Dark Down 54.9 259.9 Up 08:19:52 - 08:49:52 -1527
Yuma 08:34:49 -73.6 Dark Down 54.3 261.2 Up 08:19:49 - 08:49:49 -1571

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 14UU228, (2026/12/15 08:38UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  9.88  98
44Zet Per      03:54:07.9 +31:53:01  2.8 10.65  91
32 Tau         03:56:52.2 +22:28:38  5.6  1.31  90
PPM 093159     04:00:40.7 +20:24:47  8.4  0.94  90
PPM 093127     03:58:36.3 +21:08:53 10.0  0.23  90
14UU228        03:59:21.3 +21:18:02 14.2        90
Positions are for J2000

Event circumstances last updated at 2023/11/22 04:21:01 UT

Marc W. Buie, Southwest Research Institute

RECON