RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star GA1200:08607468 with event index number of 1510133

Geocentric closest approach at 2025/09/08 05:19:03 UTC

J2000 position of star is 19:44:35.1 +30:29:50
Equinox of date position of star is 19:45:22.3 +30:32:47
Stellar brightness G=15.5, use SENSEUP=128
Star is 63 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=21.5

[RECON map]
TNO is 15.8 AU from the Sun and 15.3 AU from the Earth.
The TNO is moving 31.8 km/sec on the sky relative to the star, or, 10.3 arcsec/hr.
The 1-sigma error in the time of the event is 69 seconds.
The 1-sigma cross-track error in the shadow position is 1685 km.
The sky-plane scale is 11113.1 km/arcsec.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 2.6 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 342842, (2025/09/08 05:19UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:48.4 +38:48:30  0.0 16.15  79
37Gam Cyg      20:23:09.1 +40:20:24  2.2 12.40  61
12Phi Cyg      19:40:23.5 +30:12:50  5.8  1.18  64
PPM 083507     19:47:01.9 +30:25:44  8.3  0.34  63
PPM 083450     19:45:04.2 +30:17:13  9.4  0.30  63
342842         19:45:36.0 +30:33:38 15.5        63
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 21.2 km RECON observability=1.0 and success probability=21.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Victoria 05:18:02 -24.0 Dark Up 71.1 200.2 Up 05:11:47 - 05:24:18 -1036
Clarence Fulton 05:17:52 -24.7 Dark Up 68.4 208.0 Up 05:11:36 - 05:24:07 -1138
Kelowna 05:17:53 -24.9 Dark Up 68.8 208.1 Up 05:11:38 - 05:24:09 -1158
Summerland 05:17:54 -25.0 Dark Up 69.1 208.0 Up 05:11:39 - 05:24:10 -1167
Penticton 05:17:54 -25.1 Dark Up 69.1 208.3 Up 05:11:39 - 05:24:10 -1178
Oliver 05:17:55 -25.4 Dark Up 69.5 208.8 Up 05:11:40 - 05:24:11 -1204
Anarchist Mountain Observatory 05:17:55 -25.6 Dark Up 69.5 209.4 Up 05:11:39 - 05:24:10 -1227
Tonasket 05:17:56 -25.8 Dark Up 69.8 209.7 Up 05:11:40 - 05:24:11 -1246
Okanogan 05:17:57 -25.9 Dark Up 70.2 209.8 Up 05:11:41 - 05:24:12 -1262
Manson/Chelan 05:17:59 -26.0 Dark Up 70.8 209.1 Up 05:11:43 - 05:24:14 -1266
Brewster 05:17:58 -26.0 Dark Up 70.5 209.7 Up 05:11:43 - 05:24:14 -1271
Entiat 05:18:00 -26.1 Dark Up 71.0 209.3 Up 05:11:44 - 05:24:15 -1278
Wenatchee 05:18:00 -26.3 Dark Up 71.2 209.4 Up 05:11:45 - 05:24:16 -1291
Ellensburg 05:18:02 -26.4 Dark Up 71.7 209.5 Up 05:11:46 - 05:24:17 -1308
Yakima 05:18:03 -26.7 Dark Up 72.0 210.1 Up 05:11:47 - 05:24:18 -1337
Toppenish/White Swan 05:18:03 -26.9 Dark Up 72.2 210.8 Up 05:11:47 - 05:24:18 -1363
The Dalles 05:18:06 -27.1 Dark Up 73.1 210.0 Up 05:11:51 - 05:24:22 -1373
Goldendale 05:18:05 -27.1 Dark Up 72.8 210.6 Up 05:11:50 - 05:24:21 -1378
Maupin 05:18:07 -27.4 Dark Up 73.4 211.0 Up 05:11:51 - 05:24:22 -1410
Sisters 05:18:10 -27.8 Dark Up 74.4 211.3 Up 05:11:55 - 05:24:26 -1444
Pasco 05:18:01 -27.7 Dark Up 71.8 214.2 Up 05:11:46 - 05:24:17 -1445
Redmond 05:18:09 -28.0 Dark Up 74.2 212.4 Up 05:11:54 - 05:24:25 -1470
PNWRO 05:18:02 -27.9 Dark Up 71.9 215.2 Up 05:11:46 - 05:24:17 -1476
Bend 05:18:10 -28.1 Dark Up 74.5 212.5 Up 05:11:55 - 05:24:26 -1477
Oregon Observatory 05:18:11 -28.1 Dark Up 74.7 212.4 Up 05:11:55 - 05:24:26 -1481
La Pine/Gilchrist 05:18:11 -28.2 Dark Up 74.8 212.7 Up 05:11:55 - 05:24:26 -1493
North Lake 05:18:11 -28.8 Dark Up 75.0 215.3 Up 05:11:56 - 05:24:27 -1561
Klamath Falls 05:18:16 -29.0 Dark Up 76.2 215.0 Up 05:12:00 - 05:24:31 -1581
Paisley 05:18:12 -29.4 Dark Up 75.2 217.6 Up 05:11:57 - 05:24:28 -1624
Lakeview 05:18:13 -29.8 Dark Up 75.6 219.4 Up 05:11:58 - 05:24:29 -1673
Fall River/Burney 05:18:18 -30.0 Dark Up 76.9 219.2 Up 05:12:02 - 05:24:33 -1690
Cedarville 05:18:15 -30.4 Dark Up 76.0 221.6 Up 05:11:59 - 05:24:30 -1732
Susanville 05:18:18 -30.9 Dark Up 77.0 223.4 Up 05:12:02 - 05:24:33 -1783
Greenville 05:18:19 -30.9 Dark Up 77.4 223.3 Up 05:12:04 - 05:24:35 -1785
Gimple 05:18:19 -30.9 Dark Up 77.3 223.6 Up 05:12:03 - 05:24:34 -1790
Quincy 05:18:20 -31.0 Dark Up 77.5 223.9 Up 05:12:05 - 05:24:36 -1800
Portola 05:18:19 -31.4 Dark Up 77.4 225.8 Up 05:12:04 - 05:24:35 -1840
Reno 05:18:19 -31.9 Dark Up 77.2 228.6 Up 05:12:03 - 05:24:34 -1901
Carson City 05:18:20 -32.2 Dark Up 77.4 229.9 Up 05:12:04 - 05:24:35 -1929
Gardnerville 05:18:20 -32.4 Dark Up 77.5 230.8 Up 05:12:05 - 05:24:36 -1950
Yerington 05:18:20 -32.7 Dark Up 77.1 232.3 Up 05:12:04 - 05:24:35 -1984
Hawthorne 05:18:19 -33.3 Dark Up 77.1 235.3 Up 05:12:04 - 05:24:35 -2053
Lee Vining 05:18:22 -33.4 Dark Up 77.7 236.2 Up 05:12:06 - 05:24:37 -2064
Bishop 05:18:22 -34.2 Dark Up 77.5 240.3 Up 05:12:07 - 05:24:38 -2156
CPSLO 05:18:31 -34.2 Dark Up 80.1 243.9 Up 05:12:16 - 05:24:47 -2157
Tonopah 05:18:18 -34.4 Dark Up 76.4 240.4 Up 05:12:03 - 05:24:34 -2179
Beatty 05:18:20 -35.5 Dark Up 76.6 245.7 Up 05:12:04 - 05:24:35 -2296
Wildwood 05:18:30 -36.3 Dark Up 78.9 254.5 Up 05:12:15 - 05:24:46 -2386
Indian Springs 05:18:19 -36.3 Dark Up 75.9 248.9 Up 05:12:03 - 05:24:34 -2391
Henderson 05:18:19 -37.1 Dark Up 75.6 252.0 Up 05:12:03 - 05:24:34 -2476
Searchlight/Boulder City 05:18:21 -37.5 Dark Up 75.7 254.3 Up 05:12:05 - 05:24:36 -2525
Idyllwild 05:18:28 -37.7 Dark Up 77.5 258.9 Up 05:12:12 - 05:24:43 -2541
Laughlin/Bullhead City 05:18:20 -38.0 Dark Up 75.5 255.9 Up 05:12:05 - 05:24:36 -2570
Mohave Valley 05:18:21 -38.2 Dark Up 75.5 256.9 Up 05:12:05 - 05:24:36 -2592
Patrick 05:18:18 -38.2 Dark Up 74.9 255.9 Up 05:12:03 - 05:24:34 -2596
Kingman/Dolan Springs 05:18:19 -38.2 Dark Up 75.1 256.5 Up 05:12:03 - 05:24:34 -2602
Lake Havasu City 05:18:21 -38.6 Dark Up 75.4 258.7 Up 05:12:06 - 05:24:37 -2639
DCO 05:18:18 -38.8 Dark Up 74.4 257.9 Up 05:12:02 - 05:24:33 -2665
Calipatria 05:18:28 -38.8 Dark Up 76.6 262.9 Up 05:12:12 - 05:24:43 -2666
Parker 05:18:23 -38.8 Dark Up 75.5 260.1 Up 05:12:07 - 05:24:38 -2668
Blythe 05:18:24 -39.0 Dark Up 75.8 261.8 Up 05:12:09 - 05:24:40 -2689
Niwot 05:17:51 -38.8 Dark Up 67.1 253.3 Up 05:11:36 - 05:24:07 -2711
SwRI 05:17:51 -38.8 Dark Up 67.2 253.4 Up 05:11:36 - 05:24:07 -2715
Yuma 05:18:26 -39.7 Dark Up 75.9 265.4 Up 05:12:11 - 05:24:42 -2758
George/Scottsdale 05:18:18 -40.6 Dark Up 73.5 264.0 Up 05:12:03 - 05:24:34 -2857

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, (2025/09/08 05:19UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.7 +38:47:07  0.0 16.15  79
37Gam Cyg      20:22:13.7 +40:15:24  2.2 12.40  61
12Phi Cyg      19:39:22.6 +30:09:13  5.8  1.18  64
PPM 083507     19:46:00.9 +30:21:54  8.3  0.34  63
PPM 083450     19:44:03.2 +30:13:26  9.4  0.30  63
342842         19:44:35.1 +30:29:50 15.5        63
Positions are for J2000

Event circumstances last updated at 2019/11/26 22:51:28 UT

Marc W. Buie, Southwest Research Institute

RECON