RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star GA1200:12104805 with event index number of 1419045

Geocentric closest approach at 2025/04/22 09:50:35 UTC

J2000 position of star is 20:14:50.3 +31:15:09
Equinox of date position of star is 20:15:38.9 +31:18:55
Stellar brightness G=15.6, use SENSEUP=128
Star is 53 degrees from the moon. Moon is 36% illuminated.
TNO apparent brightness V=22.3

[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 146 seconds.
The 1-sigma cross-track error in the shadow position is 774 km.
The sky-plane scale is 11495.9 km/arcsec.

The TNO has an absolute magnitude Hv=10.0
Diameter=83.2 km assuming a 5% albedo -- 3.5 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.4 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 342842, (2025/04/22 09:51UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:17.7 +45:22:18  1.3 14.95  64
53Eps Cyg      20:47:14.0 +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 12.5 km RECON observability=1.0 and success probability=18.0%
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 09:53:53 -22.3 Dark Down 39.8 86.9 Up 09:41:11 - 10:06:35 -868
Kelowna 09:53:51 -22.7 Dark Down 39.7 86.4 Up 09:41:09 - 10:06:33 -905
Peachland 09:53:52 -22.9 Dark Down 39.5 86.1 Up 09:41:10 - 10:06:34 -922
Summerland 09:53:51 -23.0 Dark Down 39.5 86.1 Up 09:41:09 - 10:06:33 -932
Penticton 09:53:50 -23.0 Dark Down 39.6 86.1 Up 09:41:08 - 10:06:32 -934
Oliver 09:53:49 -23.3 Dark Down 39.5 85.8 Up 09:41:07 - 10:06:31 -962
Anarchist Mountain Observatory 09:53:48 -23.4 Dark Down 39.7 85.8 Up 09:41:06 - 10:06:30 -970
Tonasket 09:53:46 -23.6 Dark Down 39.6 85.5 Up 09:41:04 - 10:06:28 -997
Niwot 09:52:35 -23.9 Dark Up 49.0 86.3 Up 09:39:53 - 10:05:17 -1019
Okanogan 09:53:45 -24.0 Dark Down 39.5 85.1 Up 09:41:03 - 10:06:27 -1028
SwRI 09:52:34 -24.0 Dark Up 48.9 86.1 Up 09:39:52 - 10:05:16 -1031
Brewster 09:53:45 -24.3 Dark Down 39.3 84.7 Up 09:41:03 - 10:06:27 -1056
Manson/Chelan 09:53:44 -24.6 Dark Down 39.0 84.3 Up 09:41:02 - 10:06:26 -1083
Entiat 09:53:43 -24.8 Dark Down 39.0 84.1 Up 09:41:01 - 10:06:25 -1103
Victoria 09:53:54 -25.1 Dark Down 37.0 82.6 Up 09:41:12 - 10:06:36 -1122
Wenatchee 09:53:42 -25.1 Dark Down 38.9 83.8 Up 09:41:00 - 10:06:24 -1126
Ellensburg 09:53:41 -25.5 Dark Down 38.7 83.3 Up 09:40:59 - 10:06:23 -1165
Pasco 09:53:35 -25.6 Dark Down 39.5 83.6 Up 09:40:53 - 10:06:17 -1179
PNWRO 09:53:33 -25.8 Dark Down 39.7 83.6 Up 09:40:51 - 10:06:15 -1191
Yakima 09:53:39 -25.9 Dark Down 38.6 83.0 Up 09:40:57 - 10:06:21 -1197
Toppenish/White Swan 09:53:38 -26.0 Dark Down 38.7 82.9 Up 09:40:56 - 10:06:20 -1209
Goldendale 09:53:36 -26.6 Dark Down 38.3 82.2 Up 09:40:54 - 10:06:18 -1265
The Dalles 09:53:36 -26.9 Dark Down 38.0 81.8 Up 09:40:54 - 10:06:18 -1293
Maupin 09:53:34 -27.3 Dark Down 38.0 81.5 Up 09:40:52 - 10:06:16 -1322
Redmond 09:53:30 -28.1 Dark Down 37.8 80.8 Up 09:40:48 - 10:06:12 -1394
Sisters 09:53:31 -28.2 Dark Down 37.5 80.5 Up 09:40:49 - 10:06:13 -1404
Bend 09:53:30 -28.3 Dark Down 37.7 80.5 Up 09:40:48 - 10:06:12 -1415
Oregon Observatory 09:53:29 -28.5 Dark Down 37.6 80.3 Up 09:40:47 - 10:06:11 -1432
La Pine/Gilchrist 09:53:28 -28.7 Dark Down 37.5 80.1 Up 09:40:46 - 10:06:10 -1449
North Lake 09:53:25 -28.9 Dark Down 37.8 80.1 Up 09:40:43 - 10:06:07 -1463
Paisley 09:53:21 -29.2 Dark Down 38.0 79.9 Up 09:40:39 - 10:06:03 -1492
Lakeview 09:53:19 -29.6 Dark Down 38.0 79.6 Up 09:40:37 - 10:06:01 -1523
Cedarville 09:53:15 -30.0 Dark Down 38.0 79.2 Up 09:40:33 - 10:05:57 -1565
Klamath Falls 09:53:22 -30.1 Dark Down 37.0 78.8 Up 09:40:40 - 10:06:04 -1565
Fall River/Burney 09:53:16 -30.9 Dark Down 37.0 78.2 Up 09:40:34 - 10:05:58 -1639
Susanville 09:53:11 -31.2 Dark Down 37.4 78.1 Up 09:40:29 - 10:05:53 -1660
Gimple 09:53:11 -31.5 Dark Down 37.2 77.8 Up 09:40:29 - 10:05:53 -1686
Greenville 09:53:10 -31.5 Dark Down 37.1 77.7 Up 09:40:28 - 10:05:52 -1689
Reno 09:53:05 -31.6 Dark Down 37.9 77.9 Up 09:40:23 - 10:05:47 -1693
Portola 09:53:08 -31.6 Dark Down 37.4 77.7 Up 09:40:26 - 10:05:50 -1696
Tonopah 09:52:51 -31.7 Dark Down 39.5 78.0 Up 09:40:09 - 10:05:33 -1699
Quincy 09:53:09 -31.7 Dark Down 37.1 77.6 Up 09:40:27 - 10:05:51 -1703
Yerington 09:53:00 -31.8 Dark Down 38.2 77.8 Up 09:40:18 - 10:05:42 -1708
DCO 09:52:27 -31.9 Dark Down 42.0 77.2 Up 09:39:45 - 10:05:09 -1714
Carson City 09:53:03 -31.9 Dark Down 37.8 77.6 Up 09:40:21 - 10:05:45 -1717
Hawthorne 09:52:57 -31.9 Dark Down 38.5 77.6 Up 09:40:15 - 10:05:39 -1720
Patrick 09:52:30 -32.1 Dark Down 41.5 77.2 Up 09:39:48 - 10:05:12 -1727
Gardnerville 09:53:03 -32.1 Dark Down 37.8 77.4 Up 09:40:21 - 10:05:45 -1732
Indian Springs 09:52:40 -32.1 Dark Down 40.3 77.4 Up 09:39:58 - 10:05:22 -1733
George/Scottsdale 09:52:16 -32.2 Dark Up 42.7 76.5 Up 09:39:34 - 10:04:58 -1735
Henderson 09:52:36 -32.2 Dark Down 40.7 77.3 Up 09:39:54 - 10:05:18 -1737
Kingman/Dolan Springs 09:52:29 -32.3 Dark Down 41.3 76.9 Up 09:39:47 - 10:05:11 -1749
Beatty 09:52:45 -32.4 Dark Down 39.6 77.2 Up 09:40:03 - 10:05:27 -1756
Searchlight/Boulder City 09:52:33 -32.6 Dark Down 40.7 76.8 Up 09:39:51 - 10:05:15 -1770
Laughlin/Bullhead City 09:52:30 -32.6 Dark Down 40.9 76.7 Up 09:39:48 - 10:05:12 -1773
Lee Vining 09:52:56 -32.6 Dark Down 38.0 77.0 Up 09:40:14 - 10:05:38 -1776
Bishop 09:52:51 -32.8 Dark Down 38.4 76.8 Up 09:40:09 - 10:05:33 -1789
Mohave Valley 09:52:29 -32.8 Dark Down 40.8 76.5 Up 09:39:47 - 10:05:11 -1789
Lake Havasu City 09:52:27 -33.0 Dark Down 40.9 76.2 Up 09:39:45 - 10:05:09 -1802
Parker 09:52:24 -33.3 Dark Down 40.8 76.0 Up 09:39:42 - 10:05:06 -1822
Blythe 09:52:22 -33.8 Dark Down 40.4 75.4 Up 09:39:40 - 10:05:04 -1866
Yuma 09:52:18 -34.6 Dark Down 40.2 74.6 Up 09:39:36 - 10:05:00 -1921
Calipatria 09:52:21 -34.7 Dark Down 39.6 74.7 Up 09:39:39 - 10:05:03 -1936
Idyllwild 09:52:29 -34.9 Dark Down 38.8 74.7 Up 09:39:47 - 10:05:11 -1951
CPSLO 09:52:46 -35.5 Dark Down 36.1 74.3 Up 09:40:04 - 10:05:28 -2002
Wildwood 09:52:34 -35.5 Dark Down 37.4 74.3 Up 09:39:52 - 10:05:16 -2003

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 09:51UT)
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 2020/03/26 22:58:47 UT

Marc W. Buie, Southwest Research Institute

RECON