RECON: TNO occultation with 10TT191

Event between 10TT191 and star GA1120:01186763 with event index number of 1496951

Geocentric closest approach at 2025/12/17 02:48:38 UTC

J2000 position of star is 05:27:22.2 +22:12:50
Equinox of date position of star is 05:28:32.7 +22:13:45
Stellar brightness G=11.1, use SENSEUP=8
Star is 150 degrees from the moon. Moon is 8% illuminated.
TNO apparent brightness V=22.8

[RECON map]
TNO is 32.2 AU from the Sun and 31.2 AU from the Earth.
The TNO is moving 25.2 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 1684 seconds.
The 1-sigma cross-track error in the shadow position is 1264 km.
The sky-plane scale is 22639.2 km/arcsec.

The TNO has an absolute magnitude Hv=7.8
Diameter=164.4 km assuming a 5% albedo -- 6.5 sec chord
Diameter=67.1 km assuming a 30% albedo -- 2.7 sec chord
Dynamical classification is 1:1
 
 
 
 
 
 

Star training set for 10TT191, (2025/12/17 02:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.8 +16:33:35  0.8 13.40 161
Alnath         05:27:56.1 +28:37:38  1.6  6.40 151
114 Tau        05:29:11.7 +21:57:25  4.7  0.28 150
PPM 094392     05:29:59.9 +22:45:42  8.1  0.58 150
PPM 094372     05:28:35.3 +22:24:45  9.9  0.20 150
10TT191        05:28:56.0 +22:14:02 11.1       150
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 0.5 sigma about the mid-time.
The median site spacing is 18.0 km RECON observability=1.0 and success probability=32.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 02:51:04 -26.7 Dark Down 28.0 88.0 Low 02:36:04 - 03:06:04 1231
Summerland 02:51:05 -26.5 Dark Down 27.8 87.7 Low 02:36:05 - 03:06:05 1217
Penticton 02:51:05 -26.6 Dark Down 27.8 87.7 Low 02:36:05 - 03:06:05 1209
Okanagan Falls 02:51:06 -26.6 Dark Down 27.8 87.6 Low 02:36:06 - 03:06:06 1197
Oliver 02:51:06 -26.6 Dark Down 27.8 87.5 Low 02:36:06 - 03:06:06 1184
Anarchist Mountain Observatory 02:51:07 -26.7 Dark Down 27.9 87.6 Low 02:36:07 - 03:06:07 1167
Oroville 02:51:07 -26.6 Dark Down 27.9 87.5 Low 02:36:07 - 03:06:07 1163
Tonasket 02:51:08 -26.6 Dark Down 27.9 87.4 Low 02:36:08 - 03:06:08 1147
Okanogan 02:51:09 -26.5 Dark Down 27.8 87.1 Low 02:36:09 - 03:06:09 1126
Brewster 02:51:10 -26.3 Dark Down 27.6 86.8 Low 02:36:10 - 03:06:10 1113
Manson/Chelan 02:51:11 -26.1 Dark Down 27.4 86.4 Low 02:36:11 - 03:06:11 1108
Wenatchee 02:51:13 -25.9 Dark Down 27.2 86.1 Low 02:36:13 - 03:06:13 1078
Ellensburg 02:51:14 -25.7 Dark Down 27.1 85.7 Low 02:36:14 - 03:06:14 1054
Yakima 02:51:16 -25.6 Dark Down 27.0 85.5 Low 02:36:16 - 03:06:16 1024
Toppenish/White Swan 02:51:16 -25.7 Dark Down 27.1 85.5 Low 02:36:16 - 03:06:16 1003
Goldendale 02:51:18 -25.4 Dark Down 26.8 84.9 Low 02:36:18 - 03:06:18 975
The Dalles 02:51:19 -25.1 Dark Down 26.5 84.6 Low 02:36:19 - 03:06:19 969
Pasco 02:51:16 -26.6 Dark Down 28.0 86.3 Low 02:36:16 - 03:06:16 957
George/Umatilla 02:51:17 -26.4 Dark Down 27.8 86.0 Low 02:36:17 - 03:06:17 938
Maupin 02:51:21 -25.1 Dark Down 26.6 84.4 Low 02:36:21 - 03:06:21 934
PNWRO 02:51:16 -26.7 Dark Down 28.1 86.4 Low 02:36:16 - 03:06:16 932
Madras/Culver 02:51:22 -25.0 Dark Down 26.5 84.2 Low 02:36:22 - 03:06:22 894
Sisters 02:51:24 -24.6 Dark Down 26.1 83.7 Low 02:36:24 - 03:06:24 882
Redmond 02:51:24 -24.9 Dark Down 26.4 83.9 Low 02:36:24 - 03:06:24 868
Bend 02:51:25 -24.8 Dark Down 26.3 83.7 Low 02:36:25 - 03:06:25 856
Oregon Observatory 02:51:25 -24.6 Dark Down 26.2 83.6 Low 02:36:25 - 03:06:25 846
La Pine/Gilchrist 02:51:26 -24.6 Dark Down 26.1 83.4 Low 02:36:26 - 03:06:26 832
North Lake 02:51:27 -24.9 Dark Down 26.5 83.6 Low 02:36:27 - 03:06:27 780
Chiloquin 02:51:29 -24.1 Dark Down 25.7 82.7 Low 02:36:29 - 03:06:29 757
Klamath Falls 02:51:30 -24.1 Dark Down 25.7 82.6 Low 02:36:30 - 03:06:30 727
Paisley 02:51:28 -25.1 Dark Down 26.7 83.6 Low 02:36:28 - 03:06:28 726
Tulelake 02:51:31 -24.3 Dark Down 25.9 82.6 Low 02:36:31 - 03:06:31 697
Lakeview 02:51:29 -25.2 Dark Down 26.8 83.5 Low 02:36:29 - 03:06:29 679
Fall River/Burney 02:51:34 -24.2 Dark Down 25.9 82.3 Low 02:36:34 - 03:06:34 622
Cedarville 02:51:31 -25.2 Dark Down 26.8 83.2 Low 02:36:31 - 03:06:31 621
Susanville 02:51:35 -24.7 Dark Down 26.4 82.4 Low 02:36:35 - 03:06:35 547
Greenville 02:51:36 -24.4 Dark Down 26.1 82.1 Low 02:36:36 - 03:06:36 534
Gimple 02:51:36 -24.4 Dark Down 26.2 82.1 Low 02:36:36 - 03:06:36 531
Quincy 02:51:37 -24.3 Dark Down 26.1 82.0 Low 02:36:37 - 03:06:37 517
Portola 02:51:37 -24.7 Dark Down 26.4 82.2 Low 02:36:37 - 03:06:37 491
Reno 02:51:37 -25.1 Dark Down 26.9 82.5 Low 02:36:37 - 03:06:37 448
Carson City 02:51:38 -25.1 Dark Down 26.9 82.3 Low 02:36:38 - 03:06:38 418
Gardnerville 02:51:38 -25.1 Dark Down 26.9 82.2 Low 02:36:38 - 03:06:38 396
Yerington 02:51:38 -25.5 Dark Down 27.3 82.6 Low 02:36:38 - 03:06:38 381
Hawthorne 02:51:39 -25.9 Dark Down 27.7 82.6 Low 02:36:39 - 03:06:39 324
Lee Vining 02:51:41 -25.4 Dark Down 27.2 82.1 Low 02:36:41 - 03:06:41 293
Tonopah 02:51:38 -26.9 Dark Down 28.7 83.2 Low 02:36:38 - 03:06:38 238
Bishop 02:51:42 -25.8 Dark Down 27.7 82.2 Low 02:36:42 - 03:06:42 218
Lone Pine 02:51:43 -26.0 Dark Down 27.9 82.0 Low 02:36:43 - 03:06:43 141
Beatty 02:51:41 -27.0 Dark Down 28.9 82.8 Low 02:36:41 - 03:06:41 123
CPSLO 02:51:49 -23.7 Dark Down 25.6 80.0 Low 02:36:49 - 03:06:49 118
Indian Springs 02:51:41 -27.8 Dark Down 29.8 83.2 Low 02:36:41 - 03:06:41 58
SwRI 02:51:17 -36.2 Dark Down 38.0 91.7 Up 02:36:17 - 03:06:17 27
Henderson 02:51:41 -28.3 Dark Down 30.3 83.3 Up 02:36:41 - 03:06:41 -12
Wildwood 02:51:50 -25.1 Dark Down 27.1 80.4 Low 02:36:50 - 03:06:50 -60
Searchlight/Boulder City 02:51:43 -28.3 Dark Down 30.2 83.0 Up 02:36:43 - 03:06:43 -65
Laughlin/Bullhead City 02:51:43 -28.5 Dark Down 30.5 83.0 Up 02:36:43 - 03:06:43 -103
Patrick 02:51:41 -29.1 Dark Down 31.1 83.5 Up 02:36:41 - 03:06:41 -105
Kingman/Dolan Springs 02:51:42 -28.9 Dark Down 30.9 83.3 Up 02:36:42 - 03:06:42 -119
Mohave Valley 02:51:44 -28.5 Dark Down 30.5 82.9 Up 02:36:44 - 03:06:44 -128
Idyllwild 02:51:49 -26.5 Dark Down 28.6 81.1 Low 02:36:49 - 03:06:49 -158
Lake Havasu City 02:51:44 -28.6 Dark Down 30.6 82.7 Up 02:36:44 - 03:06:44 -172
Parker 02:51:45 -28.6 Dark Down 30.6 82.6 Up 02:36:45 - 03:06:45 -205
Blythe 02:51:47 -28.2 Dark Down 30.3 82.1 Up 02:36:47 - 03:06:47 -242
Calipatria 02:51:49 -27.4 Dark Down 29.5 81.4 Low 02:36:49 - 03:06:49 -254
Yuma 02:51:49 -28.0 Dark Down 30.1 81.6 Up 02:36:49 - 03:06:49 -325

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 10TT191, (2025/12/17 02:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 13.40 161
Alnath         05:26:17.5 +28:36:23  1.6  6.40 151
114 Tau        05:27:38.1 +21:56:13  4.7  0.28 150
PPM 094392     05:28:25.7 +22:44:33  8.1  0.58 150
PPM 094372     05:27:01.3 +22:23:32  9.9  0.20 150
10TT191        05:27:22.2 +22:12:50 11.1       150
Positions are for J2000

Event circumstances last updated at 2019/07/08 22:56:19 UT

Marc W. Buie, Southwest Research Institute

RECON