RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star GA1200:08607468 with event index number of 2204334

Geocentric closest approach at 2025/09/08 05:18:44 UTC

J2000 position of star is 19:44:35.1 +30:29:50
Equinox of date position of star is 19:45:26.9 +30:33:04
Stellar brightness G=15.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
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 46 seconds.
The 1-sigma cross-track error in the shadow position is 1142 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           18:37:48.5 +38:48:31  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 21.1 km RECON observability=1.0 and success probability=29.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Victoria 05:17:43 -23.9 Dark Up 71.1 200.0 Up 05:13:23 - 05:22:03 -575
Kamloops 05:17:34 -23.9 Dark Up 68.4 205.0 Up 05:13:14 - 05:21:54 -591
Peachland 05:17:35 -24.8 Dark Up 69.0 207.4 Up 05:13:15 - 05:21:55 -690
Kelowna 05:17:35 -24.9 Dark Up 68.9 207.9 Up 05:13:15 - 05:21:55 -698
Summerland 05:17:35 -25.0 Dark Up 69.1 207.8 Up 05:13:15 - 05:21:55 -706
Penticton 05:17:35 -25.1 Dark Up 69.2 208.1 Up 05:13:15 - 05:21:55 -717
Oliver 05:17:36 -25.3 Dark Up 69.5 208.6 Up 05:13:16 - 05:21:56 -743
Anarchist Mountain Observatory 05:17:36 -25.5 Dark Up 69.6 209.3 Up 05:13:16 - 05:21:56 -766
Tonasket 05:17:37 -25.7 Dark Up 69.9 209.5 Up 05:13:17 - 05:21:57 -785
Okanogan 05:17:39 -25.9 Dark Up 70.2 209.6 Up 05:13:19 - 05:21:59 -802
Manson/Chelan 05:17:40 -26.0 Dark Up 70.8 208.9 Up 05:13:20 - 05:22:00 -805
Brewster 05:17:40 -26.0 Dark Up 70.5 209.5 Up 05:13:20 - 05:22:00 -810
Wenatchee 05:17:42 -26.2 Dark Up 71.3 209.2 Up 05:13:22 - 05:22:02 -830
Ellensburg 05:17:43 -26.4 Dark Up 71.7 209.3 Up 05:13:23 - 05:22:03 -848
Yakima 05:17:44 -26.7 Dark Up 72.1 209.9 Up 05:13:24 - 05:22:04 -876
Toppenish/White Swan 05:17:45 -26.9 Dark Up 72.2 210.6 Up 05:13:25 - 05:22:05 -902
The Dalles 05:17:47 -27.0 Dark Up 73.1 209.8 Up 05:13:27 - 05:22:07 -912
Goldendale 05:17:46 -27.1 Dark Up 72.8 210.4 Up 05:13:26 - 05:22:06 -917
Maupin 05:17:48 -27.4 Dark Up 73.5 210.8 Up 05:13:28 - 05:22:08 -949
Sisters 05:17:51 -27.7 Dark Up 74.4 211.0 Up 05:13:31 - 05:22:11 -983
Pasco 05:17:43 -27.6 Dark Up 71.8 214.0 Up 05:13:23 - 05:22:03 -984
Redmond 05:17:51 -28.0 Dark Up 74.3 212.2 Up 05:13:31 - 05:22:11 -1009
PNWRO 05:17:43 -27.9 Dark Up 71.9 215.0 Up 05:13:23 - 05:22:03 -1016
Bend 05:17:52 -28.0 Dark Up 74.5 212.2 Up 05:13:32 - 05:22:12 -1016
Oregon Observatory 05:17:52 -28.1 Dark Up 74.7 212.2 Up 05:13:32 - 05:22:12 -1020
La Pine/Gilchrist 05:17:53 -28.2 Dark Up 74.9 212.4 Up 05:13:33 - 05:22:13 -1031
Chiloquin 05:17:56 -28.7 Dark Up 75.9 213.7 Up 05:13:36 - 05:22:16 -1090
North Lake 05:17:53 -28.8 Dark Up 75.0 215.1 Up 05:13:33 - 05:22:13 -1100
Klamath Falls 05:17:57 -29.0 Dark Up 76.2 214.8 Up 05:13:37 - 05:22:17 -1119
Paisley 05:17:54 -29.4 Dark Up 75.3 217.4 Up 05:13:34 - 05:22:14 -1162
Sleaford 05:17:10 -28.2 Dark Up 61.8 229.7 Up 05:12:50 - 05:21:30 -1172
Lakeview 05:17:55 -29.8 Dark Up 75.6 219.2 Up 05:13:35 - 05:22:15 -1211
Fall River/Burney 05:17:59 -30.0 Dark Up 77.0 219.0 Up 05:13:39 - 05:22:19 -1229
Cedarville 05:17:56 -30.3 Dark Up 76.0 221.4 Up 05:13:36 - 05:22:16 -1271
Susanville 05:17:59 -30.8 Dark Up 77.1 223.1 Up 05:13:39 - 05:22:19 -1322
Greenville 05:18:01 -30.8 Dark Up 77.4 223.0 Up 05:13:41 - 05:22:21 -1323
Gimple 05:18:01 -30.9 Dark Up 77.4 223.3 Up 05:13:41 - 05:22:21 -1329
Quincy 05:18:01 -31.0 Dark Up 77.6 223.7 Up 05:13:41 - 05:22:21 -1338
Portola 05:18:01 -31.3 Dark Up 77.4 225.6 Up 05:13:41 - 05:22:21 -1378
Reno 05:18:01 -31.9 Dark Up 77.2 228.4 Up 05:13:41 - 05:22:21 -1440
Carson City 05:18:01 -32.1 Dark Up 77.4 229.6 Up 05:13:41 - 05:22:21 -1468
Gardnerville 05:18:02 -32.3 Dark Up 77.6 230.6 Up 05:13:42 - 05:22:22 -1489
Yerington 05:18:01 -32.6 Dark Up 77.2 232.1 Up 05:13:41 - 05:22:21 -1523
Hawthorne 05:18:01 -33.2 Dark Up 77.1 235.1 Up 05:13:41 - 05:22:21 -1592
Lee Vining 05:18:03 -33.3 Dark Up 77.8 236.0 Up 05:13:43 - 05:22:23 -1602
Bishop 05:18:03 -34.2 Dark Up 77.6 240.1 Up 05:13:43 - 05:22:23 -1694
CPSLO 05:18:13 -34.1 Dark Up 80.1 243.7 Up 05:13:53 - 05:22:33 -1695
Tonopah 05:17:59 -34.4 Dark Up 76.4 240.2 Up 05:13:39 - 05:22:19 -1718
Beatty 05:18:02 -35.4 Dark Up 76.6 245.5 Up 05:13:42 - 05:22:22 -1835
Wildwood 05:18:12 -36.2 Dark Up 79.0 254.3 Up 05:13:52 - 05:22:32 -1925
Indian Springs 05:18:00 -36.3 Dark Up 76.0 248.8 Up 05:13:40 - 05:22:20 -1929
Henderson 05:18:01 -37.1 Dark Up 75.6 251.9 Up 05:13:41 - 05:22:21 -2015
Idyllwild 05:18:09 -37.6 Dark Up 77.5 258.8 Up 05:13:49 - 05:22:29 -2079
Laughlin/Bullhead City 05:18:02 -37.9 Dark Up 75.5 255.8 Up 05:13:42 - 05:22:22 -2109
Mohave Valley 05:18:02 -38.1 Dark Up 75.6 256.8 Up 05:13:42 - 05:22:22 -2130
Patrick 05:18:00 -38.1 Dark Up 74.9 255.8 Up 05:13:40 - 05:22:20 -2135
Kingman/Dolan Springs 05:18:01 -38.2 Dark Up 75.1 256.4 Up 05:13:41 - 05:22:21 -2140
Lake Havasu City 05:18:03 -38.5 Dark Up 75.5 258.6 Up 05:13:43 - 05:22:23 -2177
Calipatria 05:18:09 -38.8 Dark Up 76.7 262.8 Up 05:13:49 - 05:22:29 -2204
Parker 05:18:04 -38.8 Dark Up 75.5 260.0 Up 05:13:44 - 05:22:24 -2206
Blythe 05:18:06 -39.0 Dark Up 75.8 261.7 Up 05:13:46 - 05:22:26 -2228
Dunrhomin 05:17:32 -38.6 Dark Up 67.1 252.9 Up 05:13:12 - 05:21:52 -2238
Yuma 05:18:08 -39.6 Dark Up 76.0 265.4 Up 05:13:48 - 05:22:28 -2296
George/Scottsdale 05:18:00 -40.5 Dark Up 73.6 263.9 Up 05:13:40 - 05:22:20 -2395

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 2021/11/16 20:50:50 UT

Marc W. Buie, Southwest Research Institute

RECON