RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star UC4-487-021258 with event index number of 342906

Geocentric closest approach at 2019/10/29 12:43:28 UTC

J2000 position of star is 06:20:37.6 +07:21:30
Equinox of date position of star is 06:21:38.7 +07:20:55
Stellar brightness R=13.7, use SENSEUP=64
Star is 138 degrees from the moon. Moon is 3% illuminated.
TNO apparent brightness V=20.2

[RECON map]
TNO is 30.2 AU from the Sun and 29.7 AU from the Earth.
The TNO is moving 12.2 km/sec on the sky relative to the star, or, 2.0 arcsec/hr.
The 1-sigma error in the time of the event is 191 seconds.
The 1-sigma cross-track error in the shadow position is 1494 km.
The sky-plane scale is 21512.5 km/arcsec.

The TNO has an absolute magnitude Hv=5.3
Diameter=524.8 km assuming a 5% albedo -- 43.1 sec chord
Diameter=214.3 km assuming a 30% albedo -- 17.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2019/10/29 12:43UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:14.7 +07:24:33  0.4  6.31 144
Alhena         06:38:51.4 +16:22:51  1.9  9.96 135
PPM 150217     06:18:02.6 +07:02:38  6.4  0.96 139
PPM 150335     06:22:10.5 +07:31:30  7.7  0.21 138
55638          06:21:42.0 +07:20:53 13.7       138
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 4.7 sigma about the mid-time.
The median site spacing is 19.2 km RECON observability=1.0 and success probability=24.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Summerland 12:39:05 -20.5 Dark Down 46.3 198.0 Up 12:24:05 - 12:54:05 -673
Kelowna 12:39:03 -20.2 Dark Down 46.1 198.5 Up 12:24:03 - 12:54:03 -684
Penticton 12:39:05 -20.4 Dark Down 46.5 198.3 Up 12:24:05 - 12:54:05 -706
Okanagan Falls 12:39:06 -20.4 Dark Down 46.7 198.4 Up 12:24:06 - 12:54:06 -719
Oliver 12:39:06 -20.4 Dark Down 46.8 198.5 Up 12:24:06 - 12:54:06 -733
Anarchist Mountain Observatory 12:39:05 -20.3 Dark Down 47.0 198.8 Up 12:24:05 - 12:54:05 -754
Oroville 12:39:06 -20.3 Dark Down 47.1 198.7 Up 12:24:06 - 12:54:06 -757
Tonasket 12:39:07 -20.3 Dark Down 47.3 198.8 Up 12:24:07 - 12:54:07 -776
Okanogan 12:39:09 -20.4 Dark Down 47.6 198.7 Up 12:24:09 - 12:54:09 -796
Brewster 12:39:09 -20.6 Dark Down 47.9 198.5 Up 12:24:09 - 12:54:09 -809
Manson/Chelan 12:39:12 -20.8 Dark Down 48.2 198.1 Up 12:24:12 - 12:54:12 -811
Entiat 12:39:13 -20.9 Dark Down 48.4 198.1 Up 12:24:13 - 12:54:13 -826
Wenatchee 12:39:14 -20.9 Dark Down 48.7 198.0 Up 12:24:14 - 12:54:14 -842
Ellensburg 12:39:16 -21.1 Dark Down 49.1 197.9 Up 12:24:16 - 12:54:16 -865
Yakima 12:39:18 -21.1 Dark Down 49.5 198.0 Up 12:24:18 - 12:54:18 -897
Toppenish/White Swan 12:39:18 -21.0 Dark Down 49.7 198.3 Up 12:24:18 - 12:54:18 -921
Goldendale 12:39:22 -21.3 Dark Down 50.3 197.9 Up 12:24:22 - 12:54:22 -948
The Dalles 12:39:24 -21.6 Dark Down 50.6 197.4 Up 12:24:24 - 12:54:24 -950
Pasco 12:39:11 -20.2 Dark Down 49.5 200.2 Up 12:24:11 - 12:54:11 -984
Maupin 12:39:24 -21.5 Dark Down 51.0 197.8 Up 12:24:24 - 12:54:24 -988
George/Umatilla 12:39:13 -20.3 Dark Down 49.9 200.0 Up 12:24:13 - 12:54:13 -1001
PNWRO 12:39:11 -20.0 Dark Down 49.7 200.7 Up 12:24:11 - 12:54:11 -1013
Madras/Culver 12:39:26 -21.6 Dark Down 51.5 197.9 Up 12:24:26 - 12:54:26 -1031
Sisters 12:39:30 -21.9 Dark Down 51.9 197.4 Up 12:24:30 - 12:54:30 -1038
Redmond 12:39:27 -21.6 Dark Down 51.8 198.0 Up 12:24:27 - 12:54:27 -1057
Bend 12:39:30 -21.7 Dark Down 52.1 197.9 Up 12:24:30 - 12:54:30 -1069
Oregon Observatory 12:39:31 -21.8 Dark Down 52.3 197.7 Up 12:24:31 - 12:54:31 -1077
La Pine/Gilchrist 12:39:31 -21.9 Dark Down 52.5 197.7 Up 12:24:31 - 12:54:31 -1091
North Lake 12:39:29 -21.5 Dark Down 52.7 198.8 Up 12:24:29 - 12:54:29 -1153
Chiloquin 12:39:36 -22.2 Dark Down 53.6 197.6 Up 12:24:36 - 12:54:36 -1166
Klamath Falls 12:39:37 -22.1 Dark Down 53.9 197.9 Up 12:24:37 - 12:54:37 -1198
Paisley 12:39:30 -21.2 Dark Down 53.2 199.7 Up 12:24:30 - 12:54:30 -1214
Tulelake 12:39:36 -21.9 Dark Down 54.1 198.5 Up 12:24:36 - 12:54:36 -1234
Lakeview 12:39:29 -21.1 Dark Down 53.6 200.2 Up 12:24:29 - 12:54:29 -1265
Fall River/Burney 12:39:39 -21.9 Dark Down 54.9 199.1 Up 12:24:39 - 12:54:39 -1313
Cedarville 12:39:30 -21.0 Dark Down 54.2 200.8 Up 12:24:30 - 12:54:30 -1328
Susanville 12:39:37 -21.3 Dark Down 55.3 200.6 Up 12:24:37 - 12:54:37 -1400
Greenville 12:39:40 -21.5 Dark Down 55.7 200.3 Up 12:24:40 - 12:54:40 -1409
Gimple 12:39:39 -21.5 Dark Down 55.7 200.4 Up 12:24:39 - 12:54:39 -1414
Quincy 12:39:40 -21.5 Dark Down 55.9 200.4 Up 12:24:40 - 12:54:40 -1427
Portola 12:39:38 -21.2 Dark Down 55.9 201.3 Up 12:24:38 - 12:54:38 -1460
Reno 12:39:35 -20.7 Dark Down 55.9 202.5 Up 12:24:35 - 12:54:35 -1512
Carson City 12:39:36 -20.6 Dark Down 56.2 202.7 Up 12:24:36 - 12:54:36 -1544
Gardnerville 12:39:37 -20.6 Dark Down 56.5 203.0 Up 12:24:37 - 12:54:37 -1567
Yerington 12:39:33 -20.2 Dark Down 56.2 203.9 Up 12:24:33 - 12:54:33 -1590
Hawthorne 12:39:32 -19.7 Dark Down 56.5 205.1 Up 12:24:32 - 12:54:32 -1655
Lee Vining 12:39:36 -20.1 Dark Down 57.2 204.6 Up 12:24:36 - 12:54:36 -1681
Tonopah 12:39:27 -18.6 Dark Down 56.4 207.7 Up 12:24:27 - 12:54:27 -1761
Bishop 12:39:35 -19.5 Dark Down 57.4 206.3 Up 12:24:35 - 12:54:35 -1767
CPSLO 12:39:55 -21.2 Dark Down 60.1 203.8 Up 12:24:55 - 12:54:55 -1839
Lone Pine 12:39:35 -19.2 Dark Down 58.0 207.4 Up 12:24:35 - 12:54:35 -1850
Beatty 12:39:27 -18.2 Dark Down 57.3 209.4 Up 12:24:27 - 12:54:27 -1885
Indian Springs 12:39:22 -17.3 AT Down 57.1 211.4 Up 12:24:22 - 12:54:22 -1964
Henderson 12:39:19 -16.7 AT Down 57.3 213.0 Up 12:24:19 - 12:54:19 -2045
Wildwood 12:39:47 -19.5 Dark Down 60.4 208.5 Up 12:24:47 - 12:54:47 -2047
Niwot 12:38:15 -9.8 NT Down 49.4 223.4 Up 12:23:15 - 12:53:15 -2092
Searchlight/Boulder City 12:39:20 -16.6 AT Down 57.7 213.6 Up 12:24:20 - 12:54:20 -2100
Laughlin/Bullhead City 12:39:19 -16.3 AT Down 57.8 214.4 Up 12:24:19 - 12:54:19 -2143
Patrick 12:39:14 -15.8 AT Down 57.3 215.3 Up 12:24:14 - 12:54:14 -2153
Kingman/Dolan Springs 12:39:16 -15.9 AT Down 57.6 215.2 Up 12:24:16 - 12:54:16 -2165
Mohave Valley 12:39:20 -16.3 AT Down 58.0 214.7 Up 12:24:20 - 12:54:20 -2168
Idyllwild 12:39:37 -17.9 AT Down 59.9 212.2 Up 12:24:37 - 12:54:37 -2172
DCO 12:39:12 -15.2 AT Down 57.2 216.7 Up 12:24:12 - 12:54:12 -2214
Lake Havasu City 12:39:20 -16.1 AT Down 58.2 215.4 Up 12:24:20 - 12:54:20 -2216
Parker 12:39:20 -16.0 AT Down 58.5 215.8 Up 12:24:20 - 12:54:20 -2250
Blythe 12:39:24 -16.2 AT Down 59.1 215.9 Up 12:24:24 - 12:54:24 -2284
Calipatria 12:39:31 -16.9 AT Down 59.9 214.8 Up 12:24:31 - 12:54:31 -2284
Yuma 12:39:27 -16.1 AT Down 59.8 216.7 Up 12:24:27 - 12:54:27 -2367

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, (2019/10/29 12:43UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  6.31 144
Alhena         06:37:42.8 +16:23:57  1.9  9.96 135
PPM 150217     06:16:58.4 +07:03:09  6.4  0.96 139
PPM 150335     06:21:06.1 +07:32:07  7.7  0.21 138
55638          06:20:37.6 +07:21:30 13.7       138
Positions are for J2000

Event circumstances last updated at 2018/10/25 20:32:11 UT

Marc W. Buie, Southwest Research Institute

RECON