RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star GA1180:09313683 with event index number of 2204439

Geocentric closest approach at 2025/09/30 04:52:36 UTC

J2000 position of star is 19:41:39.7 +29:11:30
Equinox of date position of star is 19:42:32.2 +29:14:40
Stellar brightness G=14.0, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 59 degrees from the moon. Moon is 52% illuminated.
TNO apparent brightness V=21.6

[RECON map]
TNO is 15.9 AU from the Sun and 15.5 AU from the Earth.
The TNO is moving 29.9 km/sec on the sky relative to the star, or, 9.6 arcsec/hr.
The 1-sigma error in the time of the event is 59 seconds.
The 1-sigma cross-track error in the shadow position is 728 km.
The sky-plane scale is 11262.0 km/arcsec.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 2.8 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 342842, (2025/09/30 04:55UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:48.6 +38:48:31  0.0 16.45  67
37Gam Cyg      20:23:09.2 +40:20:25  2.2 13.83  72
PPM 109352     19:38:11.2 +29:23:35  6.1  0.99  59
PPM 109509     19:42:21.7 +29:12:22  8.5  0.09  59
342842         19:42:41.5 +29:15:13 14.0        59
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 22.2 km RECON observability=1.0 and success probability=39.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Victoria 04:51:09 -28.6 Dark Up 63.8 231.0 Up 04:45:44 - 04:56:33 -194
Kamloops 04:50:59 -29.1 Dark Up 60.9 232.3 Up 04:45:35 - 04:56:24 -242
Peachland 04:51:01 -29.9 Dark Up 61.1 234.6 Up 04:45:37 - 04:56:26 -335
Kelowna 04:51:00 -30.0 Dark Up 60.9 234.8 Up 04:45:36 - 04:56:25 -345
Summerland 04:51:01 -30.1 Dark Up 61.2 234.9 Up 04:45:37 - 04:56:26 -350
Penticton 04:51:01 -30.2 Dark Up 61.2 235.2 Up 04:45:37 - 04:56:26 -361
Oliver 04:51:02 -30.4 Dark Up 61.4 235.7 Up 04:45:38 - 04:56:27 -384
Anarchist Mountain Observatory 04:51:03 -30.6 Dark Up 61.3 236.3 Up 04:45:38 - 04:56:27 -406
Tonasket 04:51:04 -30.7 Dark Up 61.6 236.6 Up 04:45:39 - 04:56:28 -422
Manson/Chelan 04:51:07 -30.8 Dark Up 62.4 236.9 Up 04:45:42 - 04:56:31 -431
Okanogan 04:51:05 -30.8 Dark Up 61.8 237.0 Up 04:45:40 - 04:56:29 -435
Brewster 04:51:06 -30.9 Dark Up 62.1 237.1 Up 04:45:41 - 04:56:30 -440
Wenatchee 04:51:08 -31.0 Dark Up 62.7 237.4 Up 04:45:44 - 04:56:33 -451
Ellensburg 04:51:10 -31.1 Dark Up 63.1 237.8 Up 04:45:45 - 04:56:34 -463
Yakima 04:51:11 -31.3 Dark Up 63.3 238.5 Up 04:45:47 - 04:56:36 -488
The Dalles 04:51:15 -31.5 Dark Up 64.2 239.3 Up 04:45:50 - 04:56:39 -510
Toppenish/White Swan 04:51:11 -31.5 Dark Up 63.3 239.1 Up 04:45:47 - 04:56:36 -512
Goldendale 04:51:14 -31.6 Dark Up 63.9 239.5 Up 04:45:49 - 04:56:38 -520
Maupin 04:51:16 -31.8 Dark Up 64.3 240.2 Up 04:45:51 - 04:56:40 -543
Sisters 04:51:19 -32.0 Dark Up 65.1 241.2 Up 04:45:55 - 04:56:44 -565
Redmond 04:51:19 -32.2 Dark Up 64.8 241.8 Up 04:45:54 - 04:56:43 -592
Bend 04:51:20 -32.3 Dark Up 65.0 242.0 Up 04:45:55 - 04:56:44 -596
Pasco 04:51:10 -32.3 Dark Up 62.6 241.1 Up 04:45:46 - 04:56:35 -598
Oregon Observatory 04:51:20 -32.3 Dark Up 65.2 242.1 Up 04:45:56 - 04:56:45 -598
La Pine/Gilchrist 04:51:21 -32.3 Dark Up 65.3 242.5 Up 04:45:57 - 04:56:46 -607
PNWRO 04:51:11 -32.6 Dark Up 62.6 241.8 Up 04:45:46 - 04:56:35 -627
Chiloquin 04:51:25 -32.7 Dark Up 66.0 244.2 Up 04:46:00 - 04:56:49 -650
North Lake 04:51:21 -33.0 Dark Up 65.1 244.1 Up 04:45:57 - 04:56:46 -673
Klamath Falls 04:51:26 -32.9 Dark Up 66.1 245.0 Up 04:46:01 - 04:56:50 -675
Paisley 04:51:23 -33.5 Dark Up 65.1 245.7 Up 04:45:58 - 04:56:47 -730
Fall River/Burney 04:51:29 -33.8 Dark Up 66.3 248.0 Up 04:46:04 - 04:56:53 -771
Lakeview 04:51:24 -33.9 Dark Up 65.2 247.0 Up 04:46:00 - 04:56:49 -773
Cedarville 04:51:26 -34.3 Dark Up 65.3 248.5 Up 04:46:02 - 04:56:51 -825
Greenville 04:51:31 -34.5 Dark Up 66.3 250.5 Up 04:46:07 - 04:56:56 -856
Susanville 04:51:30 -34.6 Dark Up 66.0 250.3 Up 04:46:05 - 04:56:54 -860
Gimple 04:51:31 -34.6 Dark Up 66.3 250.6 Up 04:46:07 - 04:56:56 -862
Quincy 04:51:32 -34.6 Dark Up 66.4 250.9 Up 04:46:07 - 04:56:56 -868
Sleaford 04:50:39 -34.6 Dark Down 52.4 248.5 Up 04:45:14 - 04:56:03 -872
Portola 04:51:32 -35.0 Dark Up 66.1 251.8 Up 04:46:07 - 04:56:56 -909
Reno 04:51:32 -35.6 Dark Up 65.7 253.1 Up 04:46:07 - 04:56:56 -969
Carson City 04:51:33 -35.8 Dark Up 65.8 253.9 Up 04:46:08 - 04:56:57 -992
Gardnerville 04:51:33 -36.0 Dark Up 65.8 254.5 Up 04:46:09 - 04:56:58 -1010
Yerington 04:51:32 -36.3 Dark Up 65.3 255.0 Up 04:46:07 - 04:56:56 -1048
Hawthorne 04:51:33 -36.9 Dark Up 65.0 256.5 Up 04:46:08 - 04:56:57 -1112
Lee Vining 04:51:35 -36.9 Dark Up 65.5 257.2 Up 04:46:11 - 04:57:00 -1113
CPSLO 04:51:46 -37.1 Dark Up 67.2 261.8 Up 04:46:21 - 04:57:10 -1158
Bishop 04:51:36 -37.7 Dark Up 65.1 259.2 Up 04:46:12 - 04:57:01 -1199
Tonopah 04:51:32 -38.1 Dark Up 64.1 258.9 Up 04:46:08 - 04:56:57 -1237
Beatty 04:51:35 -39.0 Dark Up 63.9 261.6 Up 04:46:11 - 04:57:00 -1339
Wildwood 04:51:47 -39.2 Dark Up 65.6 266.2 Up 04:46:22 - 04:57:11 -1378
Indian Springs 04:51:35 -39.9 Dark Up 63.1 263.1 Up 04:46:10 - 04:56:59 -1433
Henderson 04:51:35 -40.7 Dark Up 62.6 264.7 Up 04:46:11 - 04:57:00 -1513
Idyllwild 04:51:45 -40.7 Dark Up 64.1 268.1 Up 04:46:21 - 04:57:10 -1534
Laughlin/Bullhead City 04:51:37 -41.5 Dark Up 62.3 266.6 Up 04:46:13 - 04:57:02 -1595
Mohave Valley 04:51:38 -41.6 Dark Up 62.3 267.2 Up 04:46:14 - 04:57:03 -1612
Patrick 04:51:35 -41.8 Dark Up 61.7 266.7 Up 04:46:11 - 04:57:00 -1627
Kingman/Dolan Springs 04:51:36 -41.8 Dark Up 61.9 266.9 Up 04:46:12 - 04:57:01 -1629
Calipatria 04:51:45 -41.9 Dark Up 63.1 270.0 Up 04:46:21 - 04:57:10 -1654
Lake Havasu City 04:51:39 -42.0 Dark Up 62.1 268.1 Up 04:46:14 - 04:57:03 -1654
Parker 04:51:40 -42.2 Dark Up 62.1 268.8 Up 04:46:16 - 04:57:05 -1677
Blythe 04:51:42 -42.3 Dark Up 62.3 269.6 Up 04:46:18 - 04:57:07 -1689
Yuma 04:51:45 -42.7 Dark Up 62.4 271.4 Up 04:46:21 - 04:57:10 -1742
Dunrhomin 04:51:09 -43.9 Dark Up 54.6 265.0 Up 04:45:44 - 04:56:33 -1822
George/Scottsdale 04:51:38 -44.1 Dark Up 60.1 270.9 Up 04:46:13 - 04:57:02 -1868

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, (2025/09/30 04:55UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.7 +38:47:07  0.0 16.45  67
37Gam Cyg      20:22:13.7 +40:15:24  2.2 13.83  72
PPM 109352     19:37:09.6 +29:20:02  6.1  0.99  59
PPM 109509     19:41:19.9 +29:08:40  8.5  0.09  59
342842         19:41:39.7 +29:11:30 14.0        59
Positions are for J2000

Event circumstances last updated at 2021/11/27 00:27:52 UT

Marc W. Buie, Southwest Research Institute

RECON