RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star GA1220:09512132 with event index number of 1510008

Geocentric closest approach at 2025/07/20 06:50:10 UTC

J2000 position of star is 19:57:38.1 +32:31:20
Equinox of date position of star is 19:58:24.5 +32:34:36
Stellar brightness G=15.5, use SENSEUP=128
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 30 seconds.
The 1-sigma cross-track error in the shadow position is 2481 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     19:59:30.7 +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 22.0 km RECON observability=1.0 and success probability=20.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Clarence Fulton 06:50:29 -17.3 AT Down 67.9 136.7 Up 06:47:29 - 06:53:28 733
Victoria 06:50:40 -18.1 Dark Down 67.1 126.3 Up 06:47:41 - 06:53:40 714
Kelowna 06:50:30 -17.7 AT Down 68.1 135.7 Up 06:47:30 - 06:53:29 703
Summerland 06:50:31 -17.9 AT Down 68.2 134.9 Up 06:47:31 - 06:53:30 685
Penticton 06:50:31 -18.0 AT Down 68.3 135.0 Up 06:47:31 - 06:53:30 675
Oliver 06:50:31 -18.3 Dark Down 68.6 134.4 Up 06:47:32 - 06:53:31 643
Anarchist Mountain Observatory 06:50:31 -18.5 Dark Down 68.8 134.4 Up 06:47:32 - 06:53:31 621
Tonasket 06:50:32 -18.8 Dark Down 69.0 133.7 Up 06:47:33 - 06:53:32 595
Okanogan 06:50:33 -19.1 Dark Down 69.1 132.8 Up 06:47:33 - 06:53:32 569
Brewster 06:50:34 -19.3 Dark Down 69.2 131.9 Up 06:47:34 - 06:53:33 551
Manson/Chelan 06:50:35 -19.4 Dark Down 69.2 130.8 Up 06:47:35 - 06:53:34 544
Entiat 06:50:36 -19.6 Dark Down 69.3 130.2 Up 06:47:36 - 06:53:35 526
Wenatchee 06:50:36 -19.8 Dark Down 69.4 129.5 Up 06:47:37 - 06:53:36 506
Ellensburg 06:50:37 -20.2 Dark Down 69.5 128.3 Up 06:47:38 - 06:53:37 476
Yakima 06:50:38 -20.5 Dark Down 69.8 127.4 Up 06:47:39 - 06:53:38 439
Toppenish/White Swan 06:50:38 -20.8 Dark Down 70.0 127.2 Up 06:47:39 - 06:53:38 413
Goldendale 06:50:40 -21.2 Dark Down 70.1 125.2 Up 06:47:41 - 06:53:40 377
The Dalles 06:50:41 -21.3 Dark Down 70.0 124.0 Up 06:47:42 - 06:53:41 369
Pasco 06:50:36 -21.2 Dark Down 70.8 129.4 Up 06:47:36 - 06:53:35 358
PNWRO 06:50:36 -21.5 Dark Down 71.1 129.3 Up 06:47:36 - 06:53:35 327
Maupin 06:50:42 -21.7 Dark Down 70.3 123.3 Up 06:47:42 - 06:53:41 326
Sisters 06:50:44 -22.5 Dark Down 70.5 120.3 Up 06:47:45 - 06:53:44 262
Redmond 06:50:44 -22.6 Dark Down 70.8 121.0 Up 06:47:44 - 06:53:43 245
Bend 06:50:44 -22.7 Dark Down 70.8 120.2 Up 06:47:45 - 06:53:44 231
Oregon Observatory 06:50:45 -22.9 Dark Down 70.8 119.5 Up 06:47:45 - 06:53:44 219
La Pine/Gilchrist 06:50:45 -23.0 Dark Down 70.8 118.9 Up 06:47:46 - 06:53:45 202
North Lake 06:50:45 -23.6 Dark Down 71.4 118.8 Up 06:47:45 - 06:53:44 139
Klamath Falls 06:50:49 -24.3 Dark Down 71.3 114.7 Up 06:47:49 - 06:53:48 76
Paisley 06:50:45 -24.2 Dark Down 71.9 118.0 Up 06:47:46 - 06:53:45 74
Lakeview 06:50:46 -24.7 Dark Down 72.3 116.9 Up 06:47:46 - 06:53:45 18
Fall River/Burney 06:50:50 -25.5 Dark Down 72.1 112.0 Up 06:47:51 - 06:53:50 -50
Cedarville 06:50:46 -25.4 Dark Down 72.7 115.4 Up 06:47:47 - 06:53:46 -51
Susanville 06:50:50 -26.3 Dark Down 72.8 111.3 Up 06:47:50 - 06:53:49 -139
Greenville 06:50:51 -26.5 Dark Down 72.7 110.0 Up 06:47:51 - 06:53:50 -154
Gimple 06:50:50 -26.5 Dark Down 72.8 110.2 Up 06:47:51 - 06:53:50 -157
Quincy 06:50:51 -26.7 Dark Down 72.8 109.4 Up 06:47:52 - 06:53:51 -173
Portola 06:50:50 -26.9 Dark Down 73.2 109.8 Up 06:47:51 - 06:53:50 -204
Reno 06:50:49 -27.4 Dark Down 73.7 109.9 Up 06:47:50 - 06:53:49 -255
Carson City 06:50:50 -27.7 Dark Down 73.9 108.8 Up 06:47:50 - 06:53:49 -290
Gardnerville 06:50:50 -28.0 Dark Down 74.0 108.0 Up 06:47:50 - 06:53:49 -316
Yerington 06:50:48 -28.1 Dark Down 74.4 109.1 Up 06:47:49 - 06:53:48 -334
Hawthorne 06:50:48 -28.6 Dark Down 74.9 108.3 Up 06:47:48 - 06:53:47 -399
Lee Vining 06:50:50 -29.0 Dark Down 74.7 105.6 Up 06:47:51 - 06:53:50 -435
Tonopah 06:50:45 -29.4 Dark Down 76.1 108.8 Up 06:47:46 - 06:53:45 -499
Bishop 06:50:49 -29.8 Dark Down 75.4 104.4 Up 06:47:50 - 06:53:49 -522
Beatty 06:50:46 -30.6 Dark Down 76.8 104.9 Up 06:47:47 - 06:53:46 -631
CPSLO 06:50:58 -31.1 Dark Down 74.0 94.6 Up 06:47:59 - 06:53:58 -633
Niwot 06:50:12 -29.2 Dark Down 81.8 157.4 Up 06:47:13 - 06:53:12 -694
SwRI 06:50:12 -29.3 Dark Down 81.9 156.5 Up 06:47:13 - 06:53:12 -702
Indian Springs 06:50:44 -31.2 Dark Down 77.7 105.1 Up 06:47:44 - 06:53:43 -704
Henderson 06:50:43 -31.9 Dark Down 78.4 103.8 Up 06:47:43 - 06:53:42 -783
Wildwood 06:50:55 -32.8 Dark Down 75.7 91.6 Up 06:47:56 - 06:53:55 -836
Searchlight/Boulder City 06:50:44 -32.4 Dark Down 78.6 101.1 Up 06:47:44 - 06:53:43 -843
Laughlin/Bullhead City 06:50:43 -32.8 Dark Down 78.9 100.1 Up 06:47:44 - 06:53:43 -886
Patrick 06:50:41 -32.7 Dark Down 79.4 102.3 Up 06:47:42 - 06:53:41 -888
Kingman/Dolan Springs 06:50:42 -32.9 Dark Down 79.3 100.9 Up 06:47:42 - 06:53:41 -903
Mohave Valley 06:50:43 -33.0 Dark Down 79.0 98.7 Up 06:47:44 - 06:53:43 -914
DCO 06:50:40 -33.1 Dark Down 80.0 101.7 Up 06:47:40 - 06:53:39 -945
Idyllwild 06:50:51 -33.7 Dark Down 77.3 91.3 Up 06:47:51 - 06:53:50 -947
Lake Havasu City 06:50:43 -33.5 Dark Down 79.2 97.0 Up 06:47:44 - 06:53:43 -963
Parker 06:50:44 -33.8 Dark Down 79.3 95.1 Up 06:47:44 - 06:53:43 -1000
Blythe 06:50:45 -34.3 Dark Down 79.1 92.2 Up 06:47:46 - 06:53:45 -1041
Calipatria 06:50:49 -34.5 Dark Down 78.3 89.2 Up 06:47:49 - 06:53:48 -1055
Yuma 06:50:47 -35.2 Dark Down 79.0 87.4 Up 06:47:48 - 06:53:47 -1133
George/Scottsdale 06:50:38 -34.7 Dark Down 81.3 95.0 Up 06:47:39 - 06:53:38 -1133

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 2019/11/26 22:50:48 UT

Marc W. Buie, Southwest Research Institute

RECON