RECON: TNO occultation with 143707

Event between (143707) 03UY117 and star GA1120:00550260 with event index number of 1475744

Geocentric closest approach at 2025/11/28 08:49:13 UTC

J2000 position of star is 04:04:25.3 +23:41:10
Equinox of date position of star is 04:05:37.9 +23:44:26
Stellar brightness G=12.5, use SENSEUP=16
Star is 86 degrees from the moon. Moon is 51% illuminated.
TNO apparent brightness V=25.5

[RECON map]
TNO is 35.7 AU from the Sun and 34.7 AU from the Earth.
The TNO is moving 24.5 km/sec on the sky relative to the star, or, 3.5 arcsec/hr.
The 1-sigma error in the time of the event is 291 seconds.
The 1-sigma cross-track error in the shadow position is 2574 km.
The sky-plane scale is 25157.9 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=436.5 km assuming a 5% albedo -- 2.5 sec chord
Diameter=178.2 km assuming a 30% albedo -- 1.0 sec chord
Dynamical classification is 5:2EEE
 
 
 
 
 
 

Star training set for 143707, (2025/11/28 08:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.6 +16:33:34  0.8 10.30  92
44Zet Per      03:55:46.0 +31:57:30  2.8  8.51  86
36 Tau         04:05:55.0 +24:10:31  6.1  0.42  87
PPM 093207     04:05:44.0 +23:28:34  8.5  0.28  86
PPM 093197     04:05:17.8 +23:41:26  9.7  0.17  86
PPM 093206     04:05:40.5 +23:48:09 11.2  0.08  86
143707         04:05:58.3 +23:45:20 12.5        87
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 3.1 sigma about the mid-time.
The median site spacing is 22.2 km RECON observability=1.0 and success probability=8.3%
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 08:47:54 -58.6 Dark Down 59.6 216.2 Up 08:32:54 - 09:02:54 5901
Kelowna 08:47:56 -59.0 Dark Down 59.9 216.4 Up 08:32:56 - 09:02:56 5863
Peachland 08:47:56 -59.2 Dark Down 60.1 216.0 Up 08:32:56 - 09:02:56 5853
Summerland 08:47:56 -59.3 Dark Down 60.2 216.3 Up 08:32:56 - 09:02:56 5838
Penticton 08:47:56 -59.3 Dark Down 60.2 216.6 Up 08:32:56 - 09:02:56 5830
Oliver 08:47:55 -59.6 Dark Down 60.5 216.9 Up 08:32:55 - 09:02:55 5794
Anarchist Mountain Observatory 08:47:55 -59.7 Dark Down 60.6 217.4 Up 08:32:55 - 09:02:55 5776
Victoria 08:48:07 -61.3 Dark Down 62.5 210.9 Up 08:33:07 - 09:03:07 5754
Tonasket 08:47:55 -60.0 Dark Down 60.9 217.6 Up 08:32:55 - 09:02:55 5744
Okanogan 08:47:56 -60.3 Dark Down 61.2 217.8 Up 08:32:56 - 09:02:56 5711
Brewster 08:47:56 -60.6 Dark Down 61.5 217.7 Up 08:32:56 - 09:02:56 5684
Manson/Chelan 08:47:56 -60.9 Dark Down 61.8 217.3 Up 08:32:56 - 09:02:56 5665
Entiat 08:47:57 -61.1 Dark Down 62.0 217.5 Up 08:32:57 - 09:02:57 5643
Wenatchee 08:47:58 -61.4 Dark Down 62.2 217.6 Up 08:32:58 - 09:02:58 5617
Ellensburg 08:47:59 -61.8 Dark Down 62.7 217.7 Up 08:32:59 - 09:02:59 5576
Yakima 08:47:58 -62.2 Dark Down 63.0 218.1 Up 08:32:58 - 09:02:58 5534
Toppenish/White Swan 08:47:57 -62.3 Dark Down 63.1 218.7 Up 08:32:57 - 09:02:57 5510
Pasco 08:47:54 -62.0 Dark Down 62.6 221.1 Up 08:32:54 - 09:02:54 5489
PNWRO 08:47:53 -62.1 Dark Down 62.7 221.8 Up 08:32:53 - 09:02:53 5462
Goldendale 08:47:59 -62.9 Dark Down 63.7 218.6 Up 08:32:59 - 09:02:59 5456
The Dalles 08:48:00 -63.3 Dark Down 64.0 218.2 Up 08:33:00 - 09:03:00 5435
Maupin 08:48:00 -63.6 Dark Down 64.3 219.0 Up 08:33:00 - 09:03:00 5390
Sisters 08:48:01 -64.5 Dark Down 65.2 219.2 Up 08:33:01 - 09:03:01 5302
Redmond 08:48:00 -64.4 Dark Down 65.1 220.0 Up 08:33:00 - 09:03:00 5296
Bend 08:48:00 -64.6 Dark Down 65.3 220.1 Up 08:33:00 - 09:03:00 5275
Oregon Observatory 08:48:01 -64.8 Dark Down 65.5 220.1 Up 08:33:01 - 09:03:01 5258
La Pine/Gilchrist 08:48:01 -65.0 Dark Down 65.7 220.2 Up 08:33:01 - 09:03:01 5237
North Lake 08:47:59 -65.2 Dark Down 65.7 222.0 Up 08:32:59 - 09:02:59 5186
Paisley 08:47:58 -65.5 Dark Down 65.9 223.5 Up 08:32:58 - 09:02:58 5125
Klamath Falls 08:48:02 -66.4 Dark Down 66.9 221.9 Up 08:33:02 - 09:03:02 5085
Lakeview 08:47:57 -65.8 Dark Down 66.2 224.7 Up 08:32:57 - 09:02:57 5069
Cedarville 08:47:57 -66.3 Dark Down 66.6 226.1 Up 08:32:57 - 09:02:57 4998
Fall River/Burney 08:48:01 -67.2 Dark Down 67.6 224.6 Up 08:33:01 - 09:03:01 4956
Susanville 08:47:58 -67.4 Dark Down 67.6 227.1 Up 08:32:58 - 09:02:58 4882
Greenville 08:47:59 -67.7 Dark Down 67.9 227.0 Up 08:32:59 - 09:02:59 4855
Gimple 08:47:59 -67.7 Dark Down 67.9 227.2 Up 08:32:59 - 09:02:59 4854
Quincy 08:47:59 -67.9 Dark Down 68.1 227.4 Up 08:32:59 - 09:02:59 4834
Portola 08:47:58 -67.8 Dark Down 67.9 228.5 Up 08:32:58 - 09:02:58 4816
Niwot 08:47:09 -58.6 Dark Down 57.8 249.4 Up 08:32:09 - 09:02:09 4806
SwRI 08:47:10 -58.8 Dark Down 57.9 249.5 Up 08:32:10 - 09:02:10 4794
Reno 08:47:56 -67.7 Dark Down 67.7 230.2 Up 08:32:56 - 09:02:56 4783
Carson City 08:47:55 -67.9 Dark Down 67.9 230.9 Up 08:32:55 - 09:02:55 4744
Yerington 08:47:54 -67.8 Dark Down 67.6 232.4 Up 08:32:54 - 09:02:54 4718
Gardnerville 08:47:56 -68.1 Dark Down 68.0 231.5 Up 08:32:56 - 09:02:56 4717
Hawthorne 08:47:52 -67.8 Dark Down 67.6 234.3 Up 08:32:52 - 09:02:52 4664
Lee Vining 08:47:54 -68.5 Dark Down 68.2 234.5 Up 08:32:54 - 09:02:54 4607
Tonopah 08:47:47 -67.4 Dark Down 67.0 237.5 Up 08:32:47 - 09:02:47 4605
Bishop 08:47:51 -68.5 Dark Down 68.1 237.0 Up 08:32:51 - 09:02:51 4537
Beatty 08:47:45 -67.9 Dark Down 67.2 240.6 Up 08:32:45 - 09:02:45 4476
Indian Springs 08:47:42 -67.4 Dark Down 66.6 242.8 Up 08:32:42 - 09:02:42 4435
Henderson 08:47:39 -67.3 Dark Down 66.4 244.9 Up 08:32:39 - 09:02:39 4373
CPSLO 08:47:59 -71.2 Dark Down 70.7 237.7 Up 08:32:59 - 09:02:59 4329
Searchlight/Boulder City 08:47:40 -67.5 Dark Down 66.6 246.2 Up 08:32:40 - 09:02:40 4310
Patrick 08:47:36 -66.9 Dark Down 65.8 247.7 Up 08:32:36 - 09:02:36 4300
Kingman/Dolan Springs 08:47:37 -67.1 Dark Down 66.0 247.9 Up 08:32:37 - 09:02:37 4276
Laughlin/Bullhead City 08:47:38 -67.5 Dark Down 66.4 247.3 Up 08:32:38 - 09:02:38 4276
DCO 08:47:34 -66.5 Dark Down 65.4 249.2 Up 08:32:34 - 09:02:34 4264
Mohave Valley 08:47:38 -67.6 Dark Down 66.5 247.9 Up 08:32:38 - 09:02:38 4246
Lake Havasu City 08:47:37 -67.6 Dark Down 66.5 249.0 Up 08:32:37 - 09:02:37 4201
Wildwood 08:47:52 -70.8 Dark Down 69.9 244.1 Up 08:32:52 - 09:02:52 4181
Parker 08:47:37 -67.8 Dark Down 66.6 249.8 Up 08:32:37 - 09:02:37 4162
Idyllwild 08:47:45 -69.7 Dark Down 68.6 247.7 Up 08:32:45 - 09:02:45 4129
George/Scottsdale 08:47:29 -66.2 Dark Down 64.8 253.5 Up 08:32:29 - 09:02:29 4107
Blythe 08:47:38 -68.3 Dark Down 67.0 250.6 Up 08:32:38 - 09:02:38 4106
Calipatria 08:47:42 -69.2 Dark Down 67.9 250.6 Up 08:32:42 - 09:02:42 4056
Yuma 08:47:38 -68.7 Dark Down 67.3 252.7 Up 08:32:38 - 09:02:38 4004

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 143707, (2025/11/28 08:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 10.30  92
44Zet Per      03:54:07.9 +31:53:01  2.8  8.51  86
36 Tau         04:04:21.7 +24:06:21  6.1  0.42  87
PPM 093207     04:04:11.1 +23:24:25  8.5  0.28  86
PPM 093197     04:03:44.8 +23:37:15  9.7  0.17  86
PPM 093206     04:04:07.5 +23:43:59 11.2  0.08  86
143707         04:04:25.3 +23:41:10 12.5        86
Positions are for J2000

Event circumstances last updated at 2020/03/29 21:14:33 UT

Marc W. Buie, Southwest Research Institute

RECON