RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star GA0940:02218612 with event index number of 1422135

Geocentric closest approach at 2025/02/06 06:01:48 UTC

J2000 position of star is 06:58:14.4 +05:56:35
Equinox of date position of star is 06:59:16.8 +05:54:57
Stellar brightness G=15.9, use SENSEUP=128
Star is 50 degrees from the moon. Moon is 60% illuminated.
TNO apparent brightness V=20.3

[RECON map]
TNO is 31.4 AU from the Sun and 30.6 AU from the Earth.
The TNO is moving 20.5 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 248 seconds.
The 1-sigma cross-track error in the shadow position is 2361 km.
The sky-plane scale is 22221.5 km/arcsec.

The TNO has an absolute magnitude Hv=5.3
Diameter=524.8 km assuming a 5% albedo -- 25.6 sec chord
Diameter=214.3 km assuming a 30% albedo -- 10.5 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2025/02/06 06:02UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:31.9 +07:24:35  0.4 15.73  35
Alhena         06:39:09.7 +16:22:33  1.9 11.60  41
PPM 151776     07:03:15.5 +05:31:10  6.4  0.99  51
PPM 151571     06:57:46.3 +05:58:11  7.6  0.45  49
PPM 151640     06:59:41.3 +05:52:23  9.2  0.04  50
55638          06:59:35.0 +05:54:27 15.9        50
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 3.6 sigma about the mid-time.
The median site spacing is 17.6 km RECON observability=1.0 and success probability=14.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 06:02:45 -46.9 Dark Up 46.0 184.8 Up 05:47:45 - 06:17:45 2084
Summerland 06:02:46 -46.9 Dark Up 46.3 184.5 Up 05:47:46 - 06:17:46 2055
Penticton 06:02:45 -47.0 Dark Up 46.3 184.6 Up 05:47:45 - 06:17:45 2053
Okanagan Falls 06:02:45 -47.1 Dark Up 46.5 184.6 Up 05:47:45 - 06:17:45 2038
Oliver 06:02:45 -47.3 Dark Up 46.7 184.6 Up 05:47:45 - 06:17:45 2026
Anarchist Mountain Observatory 06:02:44 -47.5 Dark Up 46.8 184.9 Up 05:47:44 - 06:17:44 2017
Oroville 06:02:44 -47.5 Dark Up 46.9 184.8 Up 05:47:44 - 06:17:44 2010
Tonasket 06:02:44 -47.6 Dark Up 47.1 184.9 Up 05:47:44 - 06:17:44 1993
Okanogan 06:02:44 -47.8 Dark Up 47.5 184.7 Up 05:47:44 - 06:17:44 1963
Brewster 06:02:44 -47.8 Dark Up 47.8 184.4 Up 05:47:44 - 06:17:44 1938
Manson/Chelan 06:02:45 -47.8 Dark Up 48.0 183.9 Up 05:47:45 - 06:17:45 1913
Entiat 06:02:45 -47.9 Dark Up 48.2 183.8 Up 05:47:45 - 06:17:45 1894
Wenatchee 06:02:45 -48.0 Dark Up 48.5 183.6 Up 05:47:45 - 06:17:45 1872
Ellensburg 06:02:45 -48.1 Dark Up 48.9 183.3 Up 05:47:45 - 06:17:45 1834
Pasco 06:02:39 -49.3 Dark Up 49.6 185.5 Up 05:47:39 - 06:17:39 1810
Yakima 06:02:45 -48.4 Dark Up 49.3 183.3 Up 05:47:45 - 06:17:45 1802
PNWRO 06:02:38 -49.6 Dark Up 49.8 185.9 Up 05:47:38 - 06:17:38 1796
Toppenish/White Swan 06:02:44 -48.6 Dark Up 49.5 183.6 Up 05:47:44 - 06:17:44 1789
George/Umatilla 06:02:39 -49.4 Dark Up 49.9 185.2 Up 05:47:39 - 06:17:39 1778
Goldendale 06:02:45 -48.7 Dark Up 50.1 183.0 Up 05:47:45 - 06:17:45 1734
The Dalles 06:02:46 -48.6 Dark Up 50.3 182.5 Up 05:47:46 - 06:17:46 1707
Niwot 06:01:37 -60.7 Dark Up 52.5 209.1 Up 05:46:37 - 06:16:37 1692
SwRI 06:01:37 -60.8 Dark Up 52.6 209.0 Up 05:46:37 - 06:16:37 1681
Maupin 06:02:45 -48.9 Dark Up 50.7 182.6 Up 05:47:45 - 06:17:45 1676
Madras/Culver 06:02:44 -49.2 Dark Up 51.3 182.6 Up 05:47:44 - 06:17:44 1630
Redmond 06:02:44 -49.4 Dark Up 51.6 182.5 Up 05:47:44 - 06:17:44 1599
Sisters 06:02:45 -49.1 Dark Up 51.6 181.9 Up 05:47:45 - 06:17:45 1591
Bend 06:02:44 -49.4 Dark Up 51.9 182.3 Up 05:47:44 - 06:17:44 1578
Oregon Observatory 06:02:44 -49.4 Dark Up 52.0 182.1 Up 05:47:44 - 06:17:44 1561
La Pine/Gilchrist 06:02:44 -49.5 Dark Up 52.2 182.0 Up 05:47:44 - 06:17:44 1542
North Lake 06:02:41 -50.1 Dark Up 52.7 183.0 Up 05:47:41 - 06:17:41 1521
Paisley 06:02:39 -50.6 Dark Up 53.2 183.6 Up 05:47:39 - 06:17:39 1485
Lakeview 06:02:37 -51.0 Dark Up 53.7 184.0 Up 05:47:37 - 06:17:37 1447
Chiloquin 06:02:44 -49.9 Dark Up 53.4 181.5 Up 05:47:44 - 06:17:44 1440
Klamath Falls 06:02:43 -50.1 Dark Up 53.7 181.6 Up 05:47:43 - 06:17:43 1413
Tulelake 06:02:41 -50.4 Dark Up 54.0 182.1 Up 05:47:41 - 06:17:41 1398
Cedarville 06:02:36 -51.5 Dark Up 54.3 184.3 Up 05:47:36 - 06:17:36 1396
Fall River/Burney 06:02:40 -50.9 Dark Up 54.9 182.3 Up 05:47:40 - 06:17:40 1323
Susanville 06:02:36 -51.7 Dark Up 55.5 183.6 Up 05:47:36 - 06:17:36 1288
Gimple 06:02:37 -51.7 Dark Up 55.8 183.3 Up 05:47:37 - 06:17:37 1259
Greenville 06:02:37 -51.7 Dark Up 55.8 183.1 Up 05:47:37 - 06:17:37 1257
Portola 06:02:34 -52.2 Dark Up 56.1 184.0 Up 05:47:34 - 06:17:34 1241
Quincy 06:02:36 -51.8 Dark Up 56.0 183.2 Up 05:47:36 - 06:17:36 1239
Reno 06:02:32 -52.7 Dark Up 56.3 185.2 Up 05:47:32 - 06:17:32 1236
Yerington 06:02:28 -53.4 Dark Up 56.8 186.4 Up 05:47:28 - 06:17:28 1206
Carson City 06:02:31 -52.9 Dark Up 56.7 185.3 Up 05:47:31 - 06:17:31 1205
Gardnerville 06:02:30 -53.1 Dark Up 56.9 185.4 Up 05:47:30 - 06:17:30 1185
Hawthorne 06:02:25 -54.0 Dark Up 57.2 187.4 Up 05:47:25 - 06:17:25 1180
Tonopah 06:02:19 -55.2 Dark Up 57.5 190.1 Up 05:47:19 - 06:17:19 1179
Lee Vining 06:02:26 -54.0 Dark Up 57.8 186.7 Up 05:47:26 - 06:17:26 1117
Indian Springs 06:02:10 -57.0 Dark Up 58.7 193.4 Up 05:47:10 - 06:17:10 1093
Beatty 06:02:15 -56.1 Dark Up 58.6 191.3 Up 05:47:15 - 06:17:15 1091
Bishop 06:02:22 -54.8 Dark Up 58.3 188.1 Up 05:47:22 - 06:17:22 1085
Henderson 06:02:07 -57.7 Dark Up 59.1 194.9 Up 05:47:07 - 06:17:07 1066
Patrick 06:02:01 -58.8 Dark Up 59.5 197.2 Up 05:47:01 - 06:17:01 1043
DCO 06:01:57 -59.5 Dark Up 59.6 198.7 Up 05:46:57 - 06:16:57 1037
Lone Pine 06:02:20 -55.4 Dark Up 59.1 188.9 Up 05:47:20 - 06:17:20 1027
Kingman/Dolan Springs 06:02:01 -58.8 Dark Up 59.7 197.0 Up 05:47:01 - 06:17:01 1018
Searchlight/Boulder City 06:02:05 -58.1 Dark Up 59.6 195.2 Up 05:47:05 - 06:17:05 1017
Laughlin/Bullhead City 06:02:03 -58.5 Dark Up 59.9 196.0 Up 05:47:03 - 06:17:03 1001
Mohave Valley 06:02:03 -58.6 Dark Up 60.1 196.2 Up 05:47:03 - 06:17:03 976
Lake Havasu City 06:02:00 -59.0 Dark Up 60.4 196.8 Up 05:47:00 - 06:17:00 948
Parker 06:02:00 -59.2 Dark Up 60.8 197.1 Up 05:47:00 - 06:17:00 917
Blythe 06:02:00 -59.2 Dark Up 61.4 196.7 Up 05:47:00 - 06:17:00 861
CPSLO 06:02:28 -54.1 Dark Up 60.6 184.1 Up 05:47:28 - 06:17:28 835
Idyllwild 06:02:09 -57.7 Dark Up 61.7 192.4 Up 05:47:09 - 06:17:09 808
Calipatria 06:02:03 -58.8 Dark Up 62.0 195.1 Up 05:47:03 - 06:17:03 788
Wildwood 06:02:18 -56.1 Dark Up 61.6 188.5 Up 05:47:18 - 06:17:18 784
Yuma 06:01:59 -59.6 Dark Up 62.2 197.2 Up 05:46:59 - 06:16:59 776

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 55638, (2025/02/06 06:02UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 15.73  35
Alhena         06:37:42.8 +16:23:57  1.9 11.60  41
PPM 151776     07:01:55.2 +05:33:25  6.4  0.99  51
PPM 151571     06:56:25.7 +06:00:15  7.6  0.45  49
PPM 151640     06:58:20.8 +05:54:31  9.2  0.04  50
55638          06:58:14.4 +05:56:35 15.9        50
Positions are for J2000

Event circumstances last updated at 2019/06/08 10:03:53 UT

Marc W. Buie, Southwest Research Institute

RECON