RECON: TNO occultation with 69990

Event between (69990) 98WU31 and star GA1080:02372729 with event index number of 1524614

Geocentric closest approach at 2025/11/10 09:35:53 UTC

J2000 position of star is 06:46:23.2 +18:27:24
Equinox of date position of star is 06:47:48.0 +18:25:46
Stellar brightness G=16.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 17 degrees from the moon. Moon is 69% illuminated.
Apparent brightness V=24.0

[RECON map]
Object is 36.8 AU from the Sun and 36.2 AU from the Earth.
Apparent velocity is 13.6 km/sec on the sky relative to the star, or, 1.9 arcsec/hr.
The 1-sigma error in the time of the event is 1202 seconds.
The 1-sigma cross-track error in the shadow position is 2934 km.
The sky-plane scale is 26269.4 km/arcsec.

The object has an absolute magnitude Hv=8.2
Diameter=144.5 km assuming a 5% albedo -- 10.3 sec chord
Diameter=59.0 km assuming a 30% albedo -- 4.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 69990, (2025/11/10 09:36UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:53.9 +27:57:42  1.1 16.55   4
Alhena         06:39:12.3 +16:22:30  1.9  2.92  19
PPM 123009     06:47:52.1 +18:48:30  6.5  0.38  17
PPM 123008     06:47:51.5 +18:10:23  8.1  0.25  17
69990          06:47:54.0 +18:25:38 16.5        16
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 0.7 sigma about the mid-time.
The median site spacing is 33.8 km RECON observability=1.0 and success probability=19.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 09:37:51 -49.8 Dark Up 51.0 135.5 Up 09:22:51 - 09:52:51 1756
Sleaford 09:36:40 -41.9 Dark Up 54.7 157.4 Up 09:21:40 - 09:51:40 1690
Kelowna 09:37:49 -49.9 Dark Up 52.0 136.0 Up 09:22:49 - 09:52:49 1670
Peachland 09:37:51 -50.1 Dark Up 51.9 135.5 Up 09:22:51 - 09:52:51 1665
Summerland 09:37:51 -50.2 Dark Up 52.1 135.5 Up 09:22:51 - 09:52:51 1651
Penticton 09:37:51 -50.2 Dark Up 52.2 135.6 Up 09:22:51 - 09:52:51 1643
Victoria 09:38:12 -52.6 Dark Up 51.0 129.7 Up 09:23:12 - 09:53:12 1616
Oliver 09:37:52 -50.4 Dark Up 52.4 135.3 Up 09:22:52 - 09:52:52 1612
Anarchist Mountain Observatory 09:37:51 -50.5 Dark Up 52.6 135.4 Up 09:22:51 - 09:52:51 1593
Okanogan 09:37:55 -51.0 Dark Up 53.0 134.5 Up 09:22:55 - 09:52:55 1539
Brewster 09:37:57 -51.3 Dark Up 53.1 134.0 Up 09:22:57 - 09:52:57 1518
Manson/Chelan 09:37:59 -51.6 Dark Up 53.1 133.3 Up 09:22:59 - 09:52:59 1505
Wenatchee 09:38:02 -52.0 Dark Up 53.3 132.6 Up 09:23:02 - 09:53:02 1465
Ellensburg 09:38:05 -52.4 Dark Up 53.5 131.9 Up 09:23:05 - 09:53:05 1431
Yakima 09:38:05 -52.7 Dark Up 53.7 131.5 Up 09:23:05 - 09:53:05 1394
Toppenish/White Swan 09:38:06 -52.7 Dark Up 54.0 131.5 Up 09:23:06 - 09:53:06 1371
The Dalles 09:38:12 -53.6 Dark Up 54.1 129.7 Up 09:23:12 - 09:53:12 1313
PNWRO 09:37:59 -52.2 Dark Up 55.0 133.1 Up 09:22:59 - 09:52:59 1312
Maupin 09:38:13 -53.9 Dark Up 54.4 129.4 Up 09:23:13 - 09:53:13 1273
Sisters 09:38:18 -54.7 Dark Up 54.7 127.8 Up 09:23:18 - 09:53:18 1200
Bend 09:38:17 -54.7 Dark Up 55.0 127.8 Up 09:23:17 - 09:53:17 1173
Oregon Observatory 09:38:19 -54.9 Dark Up 55.0 127.5 Up 09:23:19 - 09:53:19 1159
Chiloquin 09:38:25 -56.0 Dark Up 55.6 125.4 Up 09:23:25 - 09:53:25 1042
Klamath Falls 09:38:26 -56.1 Dark Up 55.8 125.1 Up 09:23:26 - 09:53:26 1008
Cedarville 09:38:20 -55.6 Dark Up 57.2 126.4 Up 09:23:20 - 09:53:20 912
Fall River/Burney 09:38:28 -56.6 Dark Up 56.7 124.2 Up 09:23:28 - 09:53:28 887
Greenville 09:38:28 -56.9 Dark Up 57.5 123.6 Up 09:23:28 - 09:53:28 791
Gimple 09:38:27 -56.9 Dark Up 57.6 123.7 Up 09:23:27 - 09:53:27 789
Quincy 09:38:29 -57.0 Dark Up 57.6 123.4 Up 09:23:29 - 09:53:29 771
Portola 09:38:26 -56.8 Dark Up 58.0 123.8 Up 09:23:26 - 09:53:26 750
Reno 09:38:24 -56.5 Dark Up 58.6 124.3 Up 09:23:24 - 09:53:24 712
Carson City 09:38:25 -56.7 Dark Up 58.8 123.8 Up 09:23:25 - 09:53:25 676
Gardnerville 09:38:25 -56.8 Dark Up 58.9 123.6 Up 09:23:25 - 09:53:25 651
Yerington 09:38:22 -56.4 Dark Up 59.3 124.4 Up 09:23:22 - 09:53:22 645
Hawthorne 09:38:20 -56.3 Dark Up 59.9 124.5 Up 09:23:20 - 09:53:20 589
Dunrhomin 09:36:59 -46.4 Dark Up 65.6 149.6 Up 09:21:59 - 09:51:59 550
Lee Vining 09:38:24 -56.9 Dark Up 59.9 123.0 Up 09:23:24 - 09:53:24 543
Nikitin 09:36:59 -46.4 Dark Up 65.8 149.4 Up 09:21:59 - 09:51:59 532
CU-SBO 09:37:00 -46.5 Dark Up 65.8 149.2 Up 09:22:00 - 09:52:00 526
Bishop 09:38:22 -56.7 Dark Up 60.7 123.1 Up 09:23:22 - 09:53:22 469
Beatty 09:38:14 -55.8 Dark Up 62.0 124.7 Up 09:23:14 - 09:53:14 392
Patrick 09:38:00 -54.3 Dark Up 64.7 126.6 Up 09:23:00 - 09:53:00 190
Laughlin/Bullhead City 09:38:05 -54.9 Dark Up 64.4 125.1 Up 09:23:05 - 09:53:05 177
Wildwood 09:38:32 -58.3 Dark Up 62.2 117.7 Up 09:23:32 - 09:53:32 142
Lake Havasu City 09:38:05 -55.0 Dark Up 65.0 124.4 Up 09:23:05 - 09:53:05 103
Idyllwild 09:38:22 -57.0 Dark Up 63.8 119.6 Up 09:23:22 - 09:53:22 69
Calipatria 09:38:16 -56.3 Dark Up 64.9 120.1 Up 09:23:16 - 09:53:16 -16
George/Scottsdale 09:37:52 -53.3 Dark Up 67.1 126.9 Up 09:22:52 - 09:52:52 -20
Yuma 09:38:11 -55.8 Dark Up 65.8 120.6 Up 09:23:11 - 09:53:11 -78

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 69990, (2025/11/10 09:36UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 16.55   4
Alhena         06:37:42.8 +16:23:57  1.9  2.92  19
PPM 123009     06:46:21.1 +18:50:16  6.5  0.38  17
PPM 123008     06:46:20.9 +18:12:08  8.1  0.25  17
69990          06:46:23.2 +18:27:24 16.5        17
Positions are for J2000

Event circumstances last updated at 2024/02/20 04:38:21 UT

Marc W. Buie, Southwest Research Institute

RECON