RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star GA1160:09990978 with event index number of 1510264

Geocentric closest approach at 2025/10/26 04:45:02 UTC

J2000 position of star is 19:41:13.6 +27:37:52
Equinox of date position of star is 19:42:02.2 +27:40:43
Stellar brightness G=14.1, use SENSEUP=64
Star is 64 degrees from the moon. Moon is 19% illuminated.
TNO apparent brightness V=21.6

[RECON map]
TNO is 15.9 AU from the Sun and 15.8 AU from the Earth.
The TNO is moving 27.8 km/sec on the sky relative to the star, or, 8.7 arcsec/hr.
The 1-sigma error in the time of the event is 100 seconds.
The 1-sigma cross-track error in the shadow position is 861 km.
The sky-plane scale is 11484.8 km/arcsec.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 3.0 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 342842, (2025/10/26 04:45UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:48.7 +38:48:31  0.0 17.42  69
37Gam Cyg      20:23:09.3 +40:20:26  2.2 15.20  79
PPM 109352     19:38:11.3 +29:23:36  6.1  1.92  65
PPM 109510     19:42:24.5 +27:46:00  8.2  0.08  64
342842         19:42:16.6 +27:41:34 14.1        64
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 11.8 km RECON observability=1.0 and success probability=15.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
SwRI 04:43:56 -51.7 Dark Down 35.6 278.3 Up 04:35:05 - 04:52:48 2406
Niwot 04:43:56 -51.7 Dark Down 35.6 278.2 Up 04:35:04 - 04:52:47 2405
George/Scottsdale 04:44:26 -50.5 Dark Down 39.8 279.8 Up 04:35:35 - 04:53:18 2353
DCO 04:44:22 -48.9 Dark Down 41.0 278.0 Up 04:35:31 - 04:53:14 2233
Yuma 04:44:33 -48.7 Dark Down 41.9 279.5 Up 04:35:41 - 04:53:24 2231
Blythe 04:44:29 -48.4 Dark Down 42.0 278.7 Up 04:35:38 - 04:53:21 2203
Parker 04:44:27 -48.4 Dark Down 41.8 278.3 Up 04:35:35 - 04:53:18 2203
Lake Havasu City 04:44:25 -48.3 Dark Down 41.9 278.0 Up 04:35:34 - 04:53:17 2189
Patrick 04:44:22 -48.2 Dark Down 41.7 277.4 Up 04:35:30 - 04:53:13 2182
Kingman/Dolan Springs 04:44:22 -48.2 Dark Down 41.8 277.5 Up 04:35:30 - 04:53:13 2180
Calipatria 04:44:31 -47.8 Dark Down 42.7 278.7 Up 04:35:40 - 04:53:23 2165
Mohave Valley 04:44:24 -47.9 Dark Down 42.2 277.5 Up 04:35:32 - 04:53:15 2161
Laughlin/Bullhead City 04:44:23 -47.8 Dark Down 42.2 277.3 Up 04:35:31 - 04:53:14 2151
Searchlight/Boulder City 04:44:22 -47.4 Dark Down 42.5 276.9 Up 04:35:31 - 04:53:14 2121
Henderson 04:44:20 -47.2 Dark Down 42.6 276.3 Up 04:35:29 - 04:53:12 2096
Idyllwild 04:44:30 -46.7 Dark Down 43.7 277.6 Up 04:35:39 - 04:53:22 2076
Indian Springs 04:44:18 -46.4 Dark Down 43.3 275.4 Up 04:35:27 - 04:53:10 2038
Beatty 04:44:19 -45.5 Dark Down 44.2 274.6 Up 04:35:27 - 04:53:10 1964
Wildwood 04:44:30 -45.1 Dark Down 45.3 276.4 Up 04:35:39 - 04:53:22 1949
Tonopah 04:44:14 -44.7 Dark Down 44.6 273.2 Up 04:35:22 - 04:53:05 1895
Bishop 04:44:18 -44.1 Dark Down 45.5 273.2 Up 04:35:27 - 04:53:10 1851
Hawthorne 04:44:14 -43.5 Dark Down 45.7 271.9 Up 04:35:22 - 04:53:05 1795
Lee Vining 04:44:16 -43.4 Dark Down 46.1 272.2 Up 04:35:25 - 04:53:08 1787
CPSLO 04:44:28 -43.1 Dark Down 47.1 274.1 Up 04:35:36 - 04:53:19 1781
Yerington 04:44:13 -42.9 Dark Down 46.2 271.1 Up 04:35:21 - 04:53:04 1747
Gardnerville 04:44:13 -42.5 Dark Down 46.6 270.7 Up 04:35:22 - 04:53:05 1714
Carson City 04:44:12 -42.4 Dark Down 46.7 270.5 Up 04:35:21 - 04:53:04 1702
Reno 04:44:11 -42.3 Dark Down 46.7 270.1 Up 04:35:20 - 04:53:03 1687
Portola 04:44:10 -41.7 Dark Down 47.2 269.3 Up 04:35:19 - 04:53:02 1639
Quincy 04:44:10 -41.3 Dark Down 47.6 268.9 Up 04:35:19 - 04:53:02 1605
Susanville 04:44:08 -41.3 Dark Down 47.3 268.6 Up 04:35:17 - 04:53:00 1605
Gimple 04:44:09 -41.3 Dark Down 47.5 268.7 Up 04:35:18 - 04:53:01 1603
Greenville 04:44:10 -41.2 Dark Down 47.6 268.7 Up 04:35:18 - 04:53:01 1598
Cedarville 04:44:04 -41.2 Dark Down 46.9 267.7 Up 04:35:12 - 04:52:55 1590
Lakeview 04:44:01 -40.8 Dark Down 47.1 266.8 Up 04:35:10 - 04:52:53 1554
Fall River/Burney 04:44:07 -40.6 Dark Down 47.9 267.4 Up 04:35:15 - 04:52:58 1537
Paisley 04:43:59 -40.5 Dark Down 47.2 266.2 Up 04:35:08 - 04:52:51 1522
North Lake 04:43:58 -40.0 Dark Down 47.4 265.3 Up 04:35:06 - 04:52:49 1479
Klamath Falls 04:44:02 -39.9 Dark Down 48.1 265.8 Up 04:35:11 - 04:52:54 1469
PNWRO 04:43:46 -40.1 Dark Down 45.7 263.9 Up 04:34:55 - 04:52:38 1469
Pasco 04:43:46 -39.8 Dark Down 45.9 263.5 Up 04:34:54 - 04:52:37 1445
La Pine/Gilchrist 04:43:56 -39.5 Dark Down 47.8 264.4 Up 04:35:05 - 04:52:48 1427
Bend 04:43:55 -39.4 Dark Down 47.6 264.1 Up 04:35:03 - 04:52:46 1422
Oregon Observatory 04:43:56 -39.4 Dark Down 47.7 264.2 Up 04:35:05 - 04:52:48 1422
Redmond 04:43:54 -39.4 Dark Down 47.5 264.0 Up 04:35:03 - 04:52:46 1421
Sisters 04:43:55 -39.2 Dark Down 47.8 263.6 Up 04:35:03 - 04:52:46 1397
Maupin 04:43:51 -39.1 Dark Down 47.3 263.0 Up 04:34:59 - 04:52:42 1387
Goldendale 04:43:49 -39.0 Dark Down 47.1 262.6 Up 04:34:57 - 04:52:40 1374
Toppenish/White Swan 04:43:46 -39.0 Dark Down 46.7 262.3 Up 04:34:55 - 04:52:38 1372
The Dalles 04:43:49 -38.9 Dark Down 47.4 262.5 Up 04:34:58 - 04:52:41 1363
Yakima 04:43:46 -38.8 Dark Down 46.8 261.9 Up 04:34:54 - 04:52:37 1354
Ellensburg 04:43:44 -38.6 Dark Down 46.8 261.5 Up 04:34:53 - 04:52:36 1336
Wenatchee 04:43:42 -38.6 Dark Down 46.5 261.3 Up 04:34:51 - 04:52:34 1329
Brewster 04:43:40 -38.6 Dark Down 46.1 261.0 Up 04:34:48 - 04:52:31 1325
Okanogan 04:43:39 -38.6 Dark Down 45.9 260.9 Up 04:34:47 - 04:52:30 1322
Entiat 04:43:41 -38.5 Dark Down 46.4 261.1 Up 04:34:50 - 04:52:33 1322
Manson/Chelan 04:43:41 -38.5 Dark Down 46.4 260.9 Up 04:34:49 - 04:52:32 1316
Tonasket 04:43:37 -38.5 Dark Down 45.8 260.7 Up 04:34:46 - 04:52:29 1314
Anarchist Mountain Observatory 04:43:36 -38.4 Dark Down 45.7 260.4 Up 04:34:44 - 04:52:27 1303
Oliver 04:43:36 -38.2 Dark Down 45.8 260.1 Up 04:34:44 - 04:52:27 1284
Penticton 04:43:34 -38.0 Dark Down 45.7 259.7 Up 04:34:43 - 04:52:26 1267
Summerland 04:43:34 -37.9 Dark Down 45.8 259.6 Up 04:34:43 - 04:52:26 1258
Kelowna 04:43:33 -37.9 Dark Down 45.6 259.5 Up 04:34:41 - 04:52:24 1254
Clarence Fulton 04:43:31 -37.8 Dark Down 45.4 259.2 Up 04:34:40 - 04:52:23 1243
Victoria 04:43:40 -36.2 Dark Down 48.4 257.4 Up 04:34:48 - 04:52:31 1114

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 342842, (2025/10/26 04:45UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.7 +38:47:07  0.0 17.42  69
37Gam Cyg      20:22:13.7 +40:15:24  2.2 15.20  79
PPM 109352     19:37:09.6 +29:20:02  6.1  1.92  65
PPM 109510     19:41:21.5 +27:42:18  8.2  0.08  64
342842         19:41:13.6 +27:37:52 14.1        64
Positions are for J2000

Event circumstances last updated at 2019/11/26 22:52:38 UT

Marc W. Buie, Southwest Research Institute

RECON