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 08:49:43 UTC

J2000 position of star is 04:04:25.3 +23:41:10
Equinox of date position of star is 04:05:40.2 +23:44:32
Stellar brightness G=12.5, use SENSEUP=16
Star is 86 degrees from the moon. Moon is 51% illuminated.
TNO apparent brightness V=21.5

[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 90 seconds.
The 1-sigma cross-track error in the shadow position is 1434 km.
The sky-plane scale is 25157.7 km/arcsec.

The TNO has an absolute magnitude Hv=6.0
Diameter=376.7 km assuming a 5% albedo -- 15.4 sec chord
Diameter=153.8 km assuming a 30% albedo -- 6.3 sec chord
Dynamical classification is 5:2EEE
 
 
 
 
 
 

Star training set for 143707, (2025/11/28 08:50UT)
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 5.0 sigma about the mid-time.
The median site spacing is 22.2 km RECON observability=1.0 and success probability=0.1%
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 08:48:25 -58.6 Dark Down 59.5 216.4 Up 08:40:24 - 08:56:26 8314
Kelowna 08:48:26 -58.9 Dark Down 59.9 216.6 Up 08:40:25 - 08:56:27 8275
Peachland 08:48:27 -59.1 Dark Down 60.1 216.2 Up 08:40:26 - 08:56:28 8266
Summerland 08:48:27 -59.2 Dark Down 60.2 216.5 Up 08:40:26 - 08:56:28 8250
Penticton 08:48:26 -59.3 Dark Down 60.2 216.8 Up 08:40:25 - 08:56:27 8242
Oliver 08:48:26 -59.6 Dark Down 60.5 217.1 Up 08:40:25 - 08:56:27 8206
Anarchist Mountain Observatory 08:48:25 -59.7 Dark Down 60.5 217.6 Up 08:40:24 - 08:56:26 8188
Victoria 08:48:37 -61.3 Dark Down 62.4 211.1 Up 08:40:36 - 08:56:38 8167
Tonasket 08:48:25 -59.9 Dark Down 60.8 217.9 Up 08:40:24 - 08:56:26 8157
Okanogan 08:48:26 -60.3 Dark Down 61.1 218.0 Up 08:40:25 - 08:56:27 8123
Brewster 08:48:27 -60.6 Dark Down 61.4 217.9 Up 08:40:26 - 08:56:28 8096
Manson/Chelan 08:48:27 -60.9 Dark Down 61.7 217.5 Up 08:40:26 - 08:56:28 8077
Entiat 08:48:27 -61.1 Dark Down 61.9 217.7 Up 08:40:26 - 08:56:28 8055
Wenatchee 08:48:28 -61.4 Dark Down 62.2 217.8 Up 08:40:27 - 08:56:29 8029
Ellensburg 08:48:28 -61.8 Dark Down 62.6 217.9 Up 08:40:27 - 08:56:29 7988
Yakima 08:48:28 -62.1 Dark Down 62.9 218.4 Up 08:40:27 - 08:56:29 7946
Toppenish/White Swan 08:48:28 -62.3 Dark Down 63.0 218.9 Up 08:40:27 - 08:56:29 7922
Pasco 08:48:25 -61.9 Dark Down 62.6 221.3 Up 08:40:24 - 08:56:26 7901
PNWRO 08:48:24 -62.0 Dark Down 62.6 222.0 Up 08:40:23 - 08:56:25 7874
Goldendale 08:48:29 -62.9 Dark Down 63.6 218.9 Up 08:40:28 - 08:56:30 7868
The Dalles 08:48:30 -63.2 Dark Down 64.0 218.5 Up 08:40:29 - 08:56:31 7847
Maupin 08:48:30 -63.5 Dark Down 64.3 219.2 Up 08:40:29 - 08:56:31 7802
Sisters 08:48:32 -64.5 Dark Down 65.2 219.5 Up 08:40:31 - 08:56:33 7714
Redmond 08:48:30 -64.4 Dark Down 65.0 220.3 Up 08:40:29 - 08:56:31 7708
Bend 08:48:31 -64.6 Dark Down 65.2 220.3 Up 08:40:30 - 08:56:32 7687
Oregon Observatory 08:48:31 -64.8 Dark Down 65.4 220.3 Up 08:40:30 - 08:56:32 7670
La Pine/Gilchrist 08:48:31 -65.0 Dark Down 65.6 220.5 Up 08:40:30 - 08:56:32 7649
North Lake 08:48:30 -65.1 Dark Down 65.6 222.2 Up 08:40:29 - 08:56:31 7598
Paisley 08:48:28 -65.4 Dark Down 65.9 223.7 Up 08:40:27 - 08:56:29 7537
Klamath Falls 08:48:32 -66.3 Dark Down 66.8 222.1 Up 08:40:31 - 08:56:33 7497
Lakeview 08:48:28 -65.8 Dark Down 66.1 224.9 Up 08:40:27 - 08:56:29 7482
Cedarville 08:48:27 -66.2 Dark Down 66.5 226.3 Up 08:40:26 - 08:56:28 7410
Fall River/Burney 08:48:31 -67.2 Dark Down 67.5 224.8 Up 08:40:30 - 08:56:32 7368
Susanville 08:48:28 -67.3 Dark Down 67.5 227.3 Up 08:40:27 - 08:56:29 7295
Greenville 08:48:30 -67.7 Dark Down 67.9 227.2 Up 08:40:29 - 08:56:31 7267
Gimple 08:48:30 -67.7 Dark Down 67.8 227.4 Up 08:40:29 - 08:56:31 7267
Quincy 08:48:30 -67.9 Dark Down 68.0 227.6 Up 08:40:29 - 08:56:31 7246
Portola 08:48:28 -67.7 Dark Down 67.8 228.8 Up 08:40:27 - 08:56:29 7228
Niwot 08:47:40 -58.6 Dark Down 57.7 249.6 Up 08:39:39 - 08:55:41 7219
SwRI 08:47:40 -58.7 Dark Down 57.8 249.6 Up 08:39:39 - 08:55:41 7207
Reno 08:48:27 -67.6 Dark Down 67.6 230.4 Up 08:40:26 - 08:56:28 7195
Carson City 08:48:25 -67.9 Dark Down 67.8 231.2 Up 08:40:24 - 08:56:26 7156
Yerington 08:48:24 -67.7 Dark Down 67.6 232.7 Up 08:40:23 - 08:56:25 7130
Gardnerville 08:48:26 -68.0 Dark Down 68.0 231.7 Up 08:40:25 - 08:56:27 7129
Hawthorne 08:48:22 -67.8 Dark Down 67.5 234.5 Up 08:40:21 - 08:56:23 7077
Lee Vining 08:48:24 -68.4 Dark Down 68.2 234.8 Up 08:40:23 - 08:56:25 7019
Tonopah 08:48:18 -67.3 Dark Down 66.9 237.7 Up 08:40:17 - 08:56:19 7017
Bishop 08:48:21 -68.5 Dark Down 68.0 237.2 Up 08:40:20 - 08:56:22 6949
Beatty 08:48:15 -67.8 Dark Down 67.2 240.8 Up 08:40:14 - 08:56:16 6889
Indian Springs 08:48:12 -67.3 Dark Down 66.6 243.0 Up 08:40:11 - 08:56:13 6847
Henderson 08:48:09 -67.2 Dark Down 66.3 245.1 Up 08:40:08 - 08:56:10 6786
CPSLO 08:48:30 -71.2 Dark Down 70.6 238.0 Up 08:40:29 - 08:56:31 6741
Searchlight/Boulder City 08:48:10 -67.5 Dark Down 66.5 246.4 Up 08:40:09 - 08:56:11 6723
Patrick 08:48:06 -66.8 Dark Down 65.7 247.8 Up 08:40:05 - 08:56:07 6713
Kingman/Dolan Springs 08:48:07 -67.0 Dark Down 65.9 248.0 Up 08:40:06 - 08:56:08 6689
Laughlin/Bullhead City 08:48:08 -67.4 Dark Down 66.3 247.4 Up 08:40:07 - 08:56:09 6688
DCO 08:48:03 -66.4 Dark Down 65.3 249.3 Up 08:40:02 - 08:56:04 6677
Mohave Valley 08:48:08 -67.5 Dark Down 66.4 248.0 Up 08:40:07 - 08:56:09 6659
Lake Havasu City 08:48:08 -67.6 Dark Down 66.4 249.2 Up 08:40:07 - 08:56:09 6614
Wildwood 08:48:22 -70.7 Dark Down 69.8 244.3 Up 08:40:21 - 08:56:23 6593
Parker 08:48:07 -67.7 Dark Down 66.5 250.0 Up 08:40:06 - 08:56:08 6575
Idyllwild 08:48:14 -69.6 Dark Down 68.5 247.8 Up 08:40:13 - 08:56:15 6542
George/Scottsdale 08:47:59 -66.1 Dark Down 64.7 253.6 Up 08:39:58 - 08:56:00 6520
Blythe 08:48:09 -68.2 Dark Down 66.9 250.8 Up 08:40:08 - 08:56:10 6518
Calipatria 08:48:12 -69.1 Dark Down 67.8 250.8 Up 08:40:11 - 08:56:13 6468
Yuma 08:48:07 -68.6 Dark Down 67.2 252.8 Up 08:40:06 - 08:56:08 6417

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 08:50UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  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 +23:24:24  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 2020/11/20 02:22:20 UT

Marc W. Buie, Southwest Research Institute

RECON