RECON: TNO occultation with 98WY24

Event between 98WY24 and star GA1100:02877143 with event index number of 1489734

Geocentric closest approach at 2026/01/03 04:31:13 UTC

J2000 position of star is 07:38:47.0 +21:50:33
Equinox of date position of star is 07:39:56.2 +21:47:49
Stellar brightness G=13.6, use SENSEUP=64
Star is 14 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=23.0

[RECON map]
TNO is 41.5 AU from the Sun and 40.5 AU from the Earth.
The TNO is moving 25.1 km/sec on the sky relative to the star, or, 3.1 arcsec/hr.
The 1-sigma error in the time of the event is 481 seconds.
The 1-sigma cross-track error in the shadow position is 3225 km.
The sky-plane scale is 29378.5 km/arcsec.

The TNO has an absolute magnitude Hv=6.8
Diameter=267.9 km assuming a 5% albedo -- 10.7 sec chord
Diameter=109.4 km assuming a 30% albedo -- 4.4 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 98WY24, (2026/01/03 04:31UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:54.5 +27:57:41  1.1  6.36  14
PPM 097834     07:42:31.8 +22:57:23  5.9  1.28  14
PPM 097761     07:39:13.1 +22:16:46  7.8  0.56  13
PPM 097780     07:39:59.7 +21:40:01 10.0  0.14  14
98WY24         07:40:19.6 +21:46:53 13.6        14
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 1.9 sigma about the mid-time.
The median site spacing is 22.3 km RECON observability=1.0 and success probability=15.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 04:34:05 -41.5 Dark Up 33.9 95.9 Up 04:19:05 - 04:49:05 2022
Summerland 04:34:06 -41.4 Dark Up 33.8 95.5 Up 04:19:06 - 04:49:06 1999
Penticton 04:34:05 -41.5 Dark Up 33.9 95.5 Up 04:19:05 - 04:49:05 1991
Okanagan Falls 04:34:06 -41.5 Dark Up 33.9 95.4 Up 04:19:06 - 04:49:06 1974
Oliver 04:34:07 -41.6 Dark Up 33.9 95.3 Up 04:19:07 - 04:49:07 1958
Anarchist Mountain Observatory 04:34:07 -41.7 Dark Up 34.1 95.3 Up 04:19:07 - 04:49:07 1938
Oroville 04:34:07 -41.7 Dark Up 34.0 95.2 Up 04:19:07 - 04:49:07 1933
Tonasket 04:34:07 -41.8 Dark Up 34.0 95.1 Up 04:19:07 - 04:49:07 1911
Okanogan 04:34:08 -41.7 Dark Up 34.0 94.7 Up 04:19:08 - 04:49:08 1882
Brewster 04:34:09 -41.7 Dark Up 33.9 94.4 Up 04:19:09 - 04:49:09 1860
Manson/Chelan 04:34:11 -41.5 Dark Up 33.6 94.0 Up 04:19:11 - 04:49:11 1847
Entiat 04:34:11 -41.5 Dark Up 33.6 93.8 Up 04:19:11 - 04:49:11 1827
Wenatchee 04:34:12 -41.5 Dark Up 33.6 93.5 Up 04:19:12 - 04:49:12 1805
Ellensburg 04:34:13 -41.4 Dark Up 33.4 93.1 Up 04:19:13 - 04:49:13 1770
Yakima 04:34:14 -41.5 Dark Up 33.4 92.8 Up 04:19:14 - 04:49:14 1731
Toppenish/White Swan 04:34:14 -41.6 Dark Up 33.6 92.8 Up 04:19:14 - 04:49:14 1708
Pasco 04:34:12 -42.5 Dark Up 34.4 93.7 Up 04:19:12 - 04:49:12 1672
Goldendale 04:34:16 -41.4 Dark Up 33.3 92.1 Up 04:19:16 - 04:49:16 1663
The Dalles 04:34:17 -41.2 Dark Up 33.1 91.7 Up 04:19:17 - 04:49:17 1648
George/Umatilla 04:34:14 -42.4 Dark Up 34.3 93.3 Up 04:19:14 - 04:49:14 1644
PNWRO 04:34:12 -42.7 Dark Up 34.6 93.7 Up 04:19:12 - 04:49:12 1644
Maupin 04:34:18 -41.4 Dark Up 33.1 91.5 Up 04:19:18 - 04:49:18 1606
Madras/Culver 04:34:19 -41.4 Dark Up 33.1 91.1 Up 04:19:19 - 04:49:19 1554
Sisters 04:34:21 -41.1 Dark Up 32.8 90.6 Up 04:19:21 - 04:49:21 1531
Redmond 04:34:19 -41.4 Dark Up 33.1 90.9 Up 04:19:19 - 04:49:19 1520
Bend 04:34:21 -41.4 Dark Up 33.0 90.6 Up 04:19:21 - 04:49:21 1502
Oregon Observatory 04:34:21 -41.3 Dark Up 32.9 90.4 Up 04:19:21 - 04:49:21 1488
La Pine/Gilchrist 04:34:22 -41.3 Dark Up 32.9 90.3 Up 04:19:22 - 04:49:22 1469
North Lake 04:34:22 -41.8 Dark Up 33.3 90.4 Up 04:19:22 - 04:49:22 1414
Chiloquin 04:34:24 -41.1 Dark Up 32.6 89.3 Up 04:19:24 - 04:49:24 1367
Paisley 04:34:22 -42.1 Dark Up 33.6 90.3 Up 04:19:22 - 04:49:22 1352
Klamath Falls 04:34:25 -41.2 Dark Up 32.7 89.2 Up 04:19:25 - 04:49:25 1332
Tulelake 04:34:26 -41.5 Dark Up 32.9 89.2 Up 04:19:26 - 04:49:26 1299
Lakeview 04:34:23 -42.3 Dark Up 33.7 90.1 Up 04:19:23 - 04:49:23 1298
Cedarville 04:34:24 -42.5 Dark Up 33.9 89.8 Up 04:19:24 - 04:49:24 1229
Fall River/Burney 04:34:27 -41.6 Dark Up 32.9 88.7 Up 04:19:27 - 04:49:27 1207
Susanville 04:34:27 -42.3 Dark Up 33.5 88.7 Up 04:19:27 - 04:49:27 1128
Greenville 04:34:28 -42.1 Dark Up 33.3 88.3 Up 04:19:28 - 04:49:28 1107
Gimple 04:34:27 -42.1 Dark Up 33.3 88.4 Up 04:19:27 - 04:49:27 1105
Quincy 04:34:28 -42.1 Dark Up 33.3 88.2 Up 04:19:28 - 04:49:28 1086
Portola 04:34:27 -42.5 Dark Up 33.6 88.4 Up 04:19:27 - 04:49:27 1063
Reno 04:34:27 -43.0 Dark Up 34.1 88.7 Up 04:19:27 - 04:49:27 1023
Carson City 04:34:28 -43.0 Dark Up 34.1 88.4 Up 04:19:28 - 04:49:28 986
Gardnerville 04:34:28 -43.1 Dark Up 34.2 88.3 Up 04:19:28 - 04:49:28 960
Yerington 04:34:27 -43.5 Dark Up 34.6 88.7 Up 04:19:27 - 04:49:27 953
Hawthorne 04:34:27 -44.0 Dark Up 35.0 88.7 Up 04:19:27 - 04:49:27 894
Lee Vining 04:34:28 -43.6 Dark Up 34.6 88.0 Up 04:19:28 - 04:49:28 847
Niwot 04:33:56 -53.8 Dark Up 45.2 99.1 Up 04:18:56 - 04:48:56 825
Tonopah 04:34:25 -45.1 Dark Up 36.1 89.2 Up 04:19:25 - 04:49:25 817
SwRI 04:33:57 -53.8 Dark Up 45.1 98.9 Up 04:18:57 - 04:48:57 816
Bishop 04:34:28 -44.2 Dark Up 35.2 88.0 Up 04:19:28 - 04:49:28 770
Beatty 04:34:26 -45.6 Dark Up 36.5 88.6 Up 04:19:26 - 04:49:26 688
Lone Pine 04:34:29 -44.6 Dark Up 35.4 87.7 Up 04:19:29 - 04:49:29 685
Indian Springs 04:34:24 -46.5 Dark Up 37.3 89.0 Up 04:19:24 - 04:49:24 633
CPSLO 04:34:36 -42.5 Dark Up 33.3 85.4 Up 04:19:36 - 04:49:36 608
Henderson 04:34:24 -47.1 Dark Up 37.9 89.0 Up 04:19:24 - 04:49:24 563
Searchlight/Boulder City 04:34:24 -47.1 Dark Up 37.9 88.6 Up 04:19:24 - 04:49:24 502
Patrick 04:34:22 -48.0 Dark Up 38.8 89.2 Up 04:19:22 - 04:49:22 476
Laughlin/Bullhead City 04:34:24 -47.5 Dark Up 38.2 88.6 Up 04:19:24 - 04:49:24 464
Kingman/Dolan Springs 04:34:23 -47.9 Dark Up 38.6 88.9 Up 04:19:23 - 04:49:23 456
Wildwood 04:34:34 -44.2 Dark Up 34.8 85.6 Up 04:19:34 - 04:49:34 436
Mohave Valley 04:34:25 -47.5 Dark Up 38.2 88.4 Up 04:19:25 - 04:49:25 435
DCO 04:34:21 -48.6 Dark Up 39.3 89.3 Up 04:19:21 - 04:49:21 430
Lake Havasu City 04:34:25 -47.7 Dark Up 38.4 88.2 Up 04:19:25 - 04:49:25 388
Idyllwild 04:34:31 -45.8 Dark Up 36.4 86.3 Up 04:19:31 - 04:49:31 357
Parker 04:34:25 -47.7 Dark Up 38.4 87.9 Up 04:19:25 - 04:49:25 351
Blythe 04:34:27 -47.5 Dark Up 38.1 87.3 Up 04:19:27 - 04:49:27 301
Calipatria 04:34:29 -46.8 Dark Up 37.3 86.5 Up 04:19:29 - 04:49:29 268
Yuma 04:34:28 -47.5 Dark Up 38.0 86.6 Up 04:19:28 - 04:49:28 204

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 98WY24, (2026/01/03 04:31UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.0 +28:01:33  1.1  6.36  14
PPM 097834     07:40:58.5 +23:01:07  5.9  1.28  14
PPM 097761     07:37:40.1 +22:20:23  7.8  0.56  13
PPM 097780     07:38:27.2 +21:43:39 10.0  0.14  14
98WY24         07:38:47.0 +21:50:33 13.6        14
Positions are for J2000

Event circumstances last updated at 2019/06/08 13:21:21 UT

Marc W. Buie, Southwest Research Institute

RECON