RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star GA1200:12104805 with event index number of 2204014

Geocentric closest approach at 2025/04/22 09:51:17 UTC

J2000 position of star is 20:14:50.3 +31:15:09
Equinox of date position of star is 20:15:42.8 +31:19:13
Stellar brightness G=15.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 53 degrees from the moon. Moon is 36% illuminated.
TNO apparent brightness V=21.6

[RECON map]
TNO is 15.7 AU from the Sun and 15.9 AU from the Earth.
The TNO is moving 17.3 km/sec on the sky relative to the star, or, 5.4 arcsec/hr.
The 1-sigma error in the time of the event is 96 seconds.
The 1-sigma cross-track error in the shadow position is 661 km.
The sky-plane scale is 11495.9 km/arcsec.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 4.8 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 342842, (2025/04/22 09:47UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:17.7 +45:22:18  1.3 14.95  64
53Eps Cyg      20:47:14.1 +34:03:57  2.5  7.14  53
39 Cyg         20:24:52.3 +32:16:23  4.4  2.14  53
PPM 084571     20:16:42.7 +30:49:14  8.3  0.54  52
PPM 084543     20:15:57.1 +31:18:01  8.7  0.04  53
342842         20:15:51.1 +31:19:51 15.6        53
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 13.5 km RECON observability=1.0 and success probability=36.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 09:54:18 -15.7 AT Down 48.1 99.6 Up 09:45:48 - 10:02:48 -285
Kamloops 09:54:38 -22.2 Dark Down 39.3 86.6 Up 09:46:08 - 10:03:08 -903
Kelowna 09:54:33 -22.6 Dark Down 39.8 86.6 Up 09:46:03 - 10:03:03 -944
Peachland 09:54:33 -22.8 Dark Down 39.6 86.2 Up 09:46:03 - 10:03:03 -962
Summerland 09:54:32 -22.9 Dark Down 39.6 86.2 Up 09:46:02 - 10:03:02 -971
Penticton 09:54:32 -22.9 Dark Down 39.7 86.2 Up 09:46:02 - 10:03:02 -973
Oliver 09:54:30 -23.2 Dark Down 39.7 85.9 Up 09:46:00 - 10:03:00 -1001
Anarchist Mountain Observatory 09:54:29 -23.3 Dark Down 39.8 85.9 Up 09:45:59 - 10:02:59 -1009
Tonasket 09:54:28 -23.6 Dark Down 39.7 85.6 Up 09:45:58 - 10:02:58 -1036
Dunrhomin 09:53:16 -23.7 Dark Up 49.1 86.5 Up 09:44:46 - 10:01:46 -1045
Okanogan 09:54:26 -23.9 Dark Down 39.6 85.2 Up 09:45:56 - 10:02:56 -1067
Brewster 09:54:26 -24.2 Dark Down 39.4 84.8 Up 09:45:56 - 10:02:56 -1095
Manson/Chelan 09:54:26 -24.5 Dark Down 39.1 84.4 Up 09:45:56 - 10:02:56 -1122
Victoria 09:54:35 -25.0 Dark Down 37.1 82.7 Up 09:46:05 - 10:03:05 -1161
Wenatchee 09:54:24 -25.0 Dark Down 39.0 83.9 Up 09:45:54 - 10:02:54 -1165
Ellensburg 09:54:23 -25.4 Dark Down 38.8 83.4 Up 09:45:53 - 10:02:53 -1204
Pasco 09:54:16 -25.6 Dark Down 39.6 83.8 Up 09:45:46 - 10:02:46 -1218
PNWRO 09:54:14 -25.7 Dark Down 39.8 83.7 Up 09:45:44 - 10:02:44 -1229
Yakima 09:54:21 -25.8 Dark Down 38.7 83.1 Up 09:45:51 - 10:02:51 -1236
Toppenish/White Swan 09:54:19 -25.9 Dark Down 38.8 83.0 Up 09:45:49 - 10:02:49 -1248
Goldendale 09:54:18 -26.5 Dark Down 38.4 82.3 Up 09:45:48 - 10:02:48 -1304
The Dalles 09:54:18 -26.9 Dark Down 38.1 81.9 Up 09:45:48 - 10:02:48 -1332
Maupin 09:54:15 -27.2 Dark Down 38.2 81.6 Up 09:45:45 - 10:02:45 -1361
Redmond 09:54:12 -28.0 Dark Down 37.9 80.9 Up 09:45:42 - 10:02:42 -1433
Sisters 09:54:13 -28.1 Dark Down 37.7 80.6 Up 09:45:43 - 10:02:43 -1443
Bend 09:54:11 -28.3 Dark Down 37.8 80.6 Up 09:45:41 - 10:02:41 -1454
Oregon Observatory 09:54:10 -28.4 Dark Down 37.7 80.4 Up 09:45:40 - 10:02:40 -1471
La Pine/Gilchrist 09:54:09 -28.6 Dark Down 37.6 80.2 Up 09:45:39 - 10:02:39 -1488
North Lake 09:54:06 -28.8 Dark Down 37.9 80.2 Up 09:45:36 - 10:02:36 -1502
Paisley 09:54:03 -29.1 Dark Down 38.1 80.0 Up 09:45:33 - 10:02:33 -1531
Lakeview 09:54:01 -29.5 Dark Down 38.1 79.7 Up 09:45:31 - 10:02:31 -1562
Chiloquin 09:54:05 -29.7 Dark Down 37.1 79.2 Up 09:45:35 - 10:02:35 -1581
Cedarville 09:53:57 -30.0 Dark Down 38.1 79.3 Up 09:45:27 - 10:02:27 -1604
Klamath Falls 09:54:04 -30.0 Dark Down 37.1 78.9 Up 09:45:34 - 10:02:34 -1604
Fall River/Burney 09:53:57 -30.9 Dark Down 37.1 78.3 Up 09:45:27 - 10:02:27 -1677
Susanville 09:53:52 -31.1 Dark Down 37.6 78.2 Up 09:45:22 - 10:02:22 -1698
Gimple 09:53:51 -31.4 Dark Down 37.3 77.9 Up 09:45:21 - 10:02:21 -1725
Greenville 09:53:52 -31.5 Dark Down 37.3 77.8 Up 09:45:22 - 10:02:22 -1727
Reno 09:53:46 -31.5 Dark Down 38.0 77.9 Up 09:45:16 - 10:02:16 -1731
Portola 09:53:49 -31.6 Dark Down 37.6 77.8 Up 09:45:19 - 10:02:19 -1735
Tonopah 09:53:32 -31.6 Dark Down 39.6 78.0 Up 09:45:02 - 10:02:02 -1736
Quincy 09:53:51 -31.6 Dark Down 37.2 77.7 Up 09:45:21 - 10:02:21 -1741
Yerington 09:53:42 -31.7 Dark Down 38.4 77.8 Up 09:45:12 - 10:02:12 -1746
Carson City 09:53:44 -31.8 Dark Down 37.9 77.7 Up 09:45:14 - 10:02:14 -1755
Hawthorne 09:53:38 -31.8 Dark Down 38.6 77.7 Up 09:45:08 - 10:02:08 -1758
Patrick 09:53:10 -32.0 Dark Down 41.6 77.3 Up 09:44:40 - 10:01:40 -1764
Indian Springs 09:53:21 -32.0 Dark Down 40.5 77.5 Up 09:44:51 - 10:01:51 -1770
Gardnerville 09:53:43 -32.0 Dark Down 37.9 77.5 Up 09:45:13 - 10:02:13 -1770
George/Scottsdale 09:52:57 -32.2 Dark Up 42.8 76.6 Up 09:44:27 - 10:01:27 -1771
Henderson 09:53:17 -32.1 Dark Down 40.9 77.4 Up 09:44:47 - 10:01:47 -1774
Kingman/Dolan Springs 09:53:10 -32.3 Dark Down 41.4 77.0 Up 09:44:40 - 10:01:40 -1786
Beatty 09:53:25 -32.3 Dark Down 39.7 77.3 Up 09:44:55 - 10:01:55 -1793
Laughlin/Bullhead City 09:53:12 -32.5 Dark Down 41.0 76.8 Up 09:44:42 - 10:01:42 -1809
Lee Vining 09:53:37 -32.5 Dark Down 38.1 77.1 Up 09:45:07 - 10:02:07 -1814
Mohave Valley 09:53:11 -32.8 Dark Down 40.9 76.6 Up 09:44:41 - 10:01:41 -1826
Bishop 09:53:33 -32.7 Dark Down 38.6 76.9 Up 09:45:03 - 10:02:03 -1826
Lake Havasu City 09:53:07 -32.9 Dark Down 41.0 76.3 Up 09:44:37 - 10:01:37 -1839
Parker 09:53:05 -33.2 Dark Down 41.0 76.0 Up 09:44:35 - 10:01:35 -1858
Blythe 09:53:04 -33.7 Dark Down 40.6 75.5 Up 09:44:34 - 10:01:34 -1903
Yuma 09:52:59 -34.5 Dark Down 40.3 74.7 Up 09:44:29 - 10:01:29 -1958
Calipatria 09:53:03 -34.6 Dark Down 39.7 74.7 Up 09:44:33 - 10:01:33 -1972
Idyllwild 09:53:09 -34.8 Dark Down 38.9 74.8 Up 09:44:39 - 10:01:39 -1988
CPSLO 09:53:27 -35.4 Dark Down 36.3 74.4 Up 09:44:57 - 10:01:57 -2041
Wildwood 09:53:16 -35.4 Dark Down 37.5 74.3 Up 09:44:46 - 10:01:46 -2041

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, (2025/04/22 09:47UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 14.95  64
53Eps Cyg      20:46:13.3 +33:58:20  2.5  7.14  53
39 Cyg         20:23:51.7 +32:11:24  4.4  2.14  53
PPM 084571     20:15:41.6 +30:44:30  8.3  0.54  52
PPM 084543     20:14:56.3 +31:13:19  8.7  0.04  53
342842         20:14:50.3 +31:15:09 15.6        53
Positions are for J2000

Event circumstances last updated at 2021/11/16 01:10:32 UT

Marc W. Buie, Southwest Research Institute

RECON