RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star GA1220:09512132 with event index number of 2204134

Geocentric closest approach at 2025/07/20 06:50:04 UTC

J2000 position of star is 19:57:38.1 +32:31:20
Equinox of date position of star is 19:58:29.1 +32:34:56
Stellar brightness G=15.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 96 degrees from the moon. Moon is 25% illuminated.
TNO apparent brightness V=21.5

[RECON map]
TNO is 15.8 AU from the Sun and 15.2 AU from the Earth.
The TNO is moving 30.8 km/sec on the sky relative to the star, or, 10.1 arcsec/hr.
The 1-sigma error in the time of the event is 24 seconds.
The 1-sigma cross-track error in the shadow position is 1618 km.
The sky-plane scale is 11002.7 km/arcsec.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 2.7 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 342842, (2025/07/20 06:50UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:18.2 +45:22:22  1.3 15.31  82
37Gam Cyg      20:23:08.8 +40:20:23  2.2  9.18  88
PPM 084050     20:02:56.3 +31:11:24  6.5  1.67  96
PPM 083826     19:56:20.9 +32:48:29  8.2  0.53  96
PPM 083933     19:59:30.8 +33:03:05  9.0  0.50  96
PPM 083939     19:59:36.0 +32:35:32 11.2  0.20  96
342842         19:58:37.7 +32:35:32 15.5        96
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 25.9 km RECON observability=1.0 and success probability=32.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kamloops 06:50:25 -16.7 AT Down 67.2 135.4 Up 06:47:56 - 06:52:54 1501
Victoria 06:50:35 -18.0 Dark Down 67.1 126.2 Up 06:48:06 - 06:53:04 1411
Kelowna 06:50:25 -17.7 AT Down 68.1 135.7 Up 06:47:56 - 06:52:54 1399
Peachland 06:50:25 -17.7 AT Down 68.1 135.0 Up 06:47:56 - 06:52:54 1399
Summerland 06:50:26 -17.9 AT Down 68.2 134.9 Up 06:47:57 - 06:52:55 1382
Penticton 06:50:25 -18.0 AT Down 68.3 135.0 Up 06:47:56 - 06:52:54 1372
Oliver 06:50:26 -18.3 Dark Down 68.6 134.3 Up 06:47:57 - 06:52:55 1340
Anarchist Mountain Observatory 06:50:26 -18.5 Dark Down 68.8 134.4 Up 06:47:57 - 06:52:55 1318
Tonasket 06:50:27 -18.8 Dark Down 69.0 133.7 Up 06:47:58 - 06:52:56 1292
Okanogan 06:50:28 -19.1 Dark Down 69.1 132.8 Up 06:47:59 - 06:52:57 1266
Brewster 06:50:28 -19.3 Dark Down 69.2 131.9 Up 06:47:59 - 06:52:57 1248
Manson/Chelan 06:50:30 -19.4 Dark Down 69.2 130.8 Up 06:48:01 - 06:52:59 1241
Sleaford 06:49:54 -17.2 AT Up 70.2 168.6 Up 06:47:25 - 06:52:23 1230
Wenatchee 06:50:31 -19.8 Dark Down 69.4 129.5 Up 06:48:02 - 06:53:00 1203
Ellensburg 06:50:32 -20.2 Dark Down 69.5 128.2 Up 06:48:03 - 06:53:01 1173
Yakima 06:50:33 -20.5 Dark Down 69.8 127.3 Up 06:48:04 - 06:53:02 1136
Toppenish/White Swan 06:50:33 -20.8 Dark Down 70.0 127.2 Up 06:48:04 - 06:53:02 1110
Goldendale 06:50:35 -21.2 Dark Down 70.1 125.2 Up 06:48:06 - 06:53:04 1074
The Dalles 06:50:36 -21.3 Dark Down 70.0 124.0 Up 06:48:07 - 06:53:05 1066
Pasco 06:50:30 -21.2 Dark Down 70.8 129.3 Up 06:48:01 - 06:52:59 1054
PNWRO 06:50:30 -21.5 Dark Down 71.0 129.2 Up 06:48:01 - 06:52:59 1024
Maupin 06:50:37 -21.7 Dark Down 70.3 123.2 Up 06:48:08 - 06:53:06 1023
Sisters 06:50:39 -22.4 Dark Down 70.5 120.3 Up 06:48:10 - 06:53:08 959
Redmond 06:50:38 -22.6 Dark Down 70.7 120.9 Up 06:48:09 - 06:53:07 942
Bend 06:50:39 -22.7 Dark Down 70.8 120.1 Up 06:48:10 - 06:53:08 928
Oregon Observatory 06:50:40 -22.9 Dark Down 70.8 119.5 Up 06:48:11 - 06:53:09 916
La Pine/Gilchrist 06:50:40 -23.0 Dark Down 70.8 118.9 Up 06:48:11 - 06:53:09 899
North Lake 06:50:40 -23.6 Dark Down 71.4 118.8 Up 06:48:11 - 06:53:09 836
Chiloquin 06:50:43 -24.0 Dark Down 71.1 115.4 Up 06:48:14 - 06:53:12 808
Klamath Falls 06:50:44 -24.3 Dark Down 71.3 114.7 Up 06:48:15 - 06:53:13 773
Paisley 06:50:40 -24.2 Dark Down 71.9 118.0 Up 06:48:11 - 06:53:09 771
Lakeview 06:50:40 -24.7 Dark Down 72.3 116.9 Up 06:48:11 - 06:53:09 715
Fall River/Burney 06:50:45 -25.5 Dark Down 72.0 112.0 Up 06:48:16 - 06:53:14 647
Cedarville 06:50:41 -25.4 Dark Down 72.7 115.3 Up 06:48:12 - 06:53:10 646
Susanville 06:50:44 -26.3 Dark Down 72.8 111.3 Up 06:48:15 - 06:53:13 558
Greenville 06:50:45 -26.5 Dark Down 72.7 110.0 Up 06:48:16 - 06:53:14 543
Gimple 06:50:45 -26.5 Dark Down 72.8 110.1 Up 06:48:16 - 06:53:14 540
Quincy 06:50:46 -26.7 Dark Down 72.8 109.4 Up 06:48:17 - 06:53:15 524
Portola 06:50:45 -26.9 Dark Down 73.2 109.7 Up 06:48:16 - 06:53:14 493
Reno 06:50:44 -27.4 Dark Down 73.7 109.9 Up 06:48:15 - 06:53:13 442
Carson City 06:50:44 -27.7 Dark Down 73.8 108.7 Up 06:48:15 - 06:53:13 407
Gardnerville 06:50:45 -27.9 Dark Down 74.0 108.0 Up 06:48:16 - 06:53:14 381
Yerington 06:50:43 -28.1 Dark Down 74.4 109.0 Up 06:48:14 - 06:53:12 363
Hawthorne 06:50:43 -28.6 Dark Down 74.9 108.2 Up 06:48:14 - 06:53:12 298
Lee Vining 06:50:45 -29.0 Dark Down 74.7 105.6 Up 06:48:16 - 06:53:14 262
Tonopah 06:50:40 -29.4 Dark Down 76.1 108.8 Up 06:48:11 - 06:53:09 198
Bishop 06:50:44 -29.8 Dark Down 75.4 104.4 Up 06:48:15 - 06:53:13 175
Beatty 06:50:41 -30.6 Dark Down 76.8 104.9 Up 06:48:12 - 06:53:10 66
CPSLO 06:50:53 -31.1 Dark Down 74.0 94.6 Up 06:48:24 - 06:53:22 64
Dunrhomin 06:50:07 -29.0 Dark Down 81.7 157.6 Up 06:47:38 - 06:52:36 17
Indian Springs 06:50:39 -31.2 Dark Down 77.7 105.1 Up 06:48:10 - 06:53:08 -7
Henderson 06:50:38 -31.9 Dark Down 78.4 103.7 Up 06:48:09 - 06:53:07 -86
Wildwood 06:50:50 -32.8 Dark Down 75.7 91.6 Up 06:48:21 - 06:53:19 -139
Laughlin/Bullhead City 06:50:38 -32.8 Dark Down 78.9 100.1 Up 06:48:09 - 06:53:07 -189
Patrick 06:50:36 -32.7 Dark Down 79.4 102.3 Up 06:48:07 - 06:53:05 -191
Kingman/Dolan Springs 06:50:37 -32.9 Dark Down 79.3 100.9 Up 06:48:08 - 06:53:06 -206
Mohave Valley 06:50:38 -33.0 Dark Down 78.9 98.7 Up 06:48:09 - 06:53:07 -217
Idyllwild 06:50:46 -33.7 Dark Down 77.3 91.3 Up 06:48:17 - 06:53:15 -250
Lake Havasu City 06:50:38 -33.5 Dark Down 79.2 96.9 Up 06:48:09 - 06:53:07 -266
Parker 06:50:39 -33.8 Dark Down 79.3 95.1 Up 06:48:10 - 06:53:08 -303
Blythe 06:50:40 -34.3 Dark Down 79.0 92.1 Up 06:48:11 - 06:53:09 -344
Calipatria 06:50:43 -34.5 Dark Down 78.3 89.1 Up 06:48:14 - 06:53:12 -358
Yuma 06:50:42 -35.2 Dark Down 79.0 87.4 Up 06:48:13 - 06:53:11 -436
George/Scottsdale 06:50:33 -34.7 Dark Down 81.3 95.0 Up 06:48:04 - 06:53:02 -436

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, (2025/07/20 06:50UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 15.31  82
37Gam Cyg      20:22:13.7 +40:15:24  2.2  9.18  88
PPM 084050     20:01:55.5 +31:07:03  6.5  1.67  96
PPM 083826     19:55:21.6 +32:44:21  8.2  0.53  96
PPM 083933     19:58:31.4 +32:58:51  9.0  0.50  96
PPM 083939     19:58:36.4 +32:31:18 11.2  0.20  96
342842         19:57:38.1 +32:31:20 15.5        96
Positions are for J2000

Event circumstances last updated at 2021/11/16 20:47:49 UT

Marc W. Buie, Southwest Research Institute

RECON