RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star GA0960:01534865 with event index number of 342906

Geocentric closest approach at 2019/10/29 12:41:53 UTC

J2000 position of star is 06:20:37.6 +07:21:30
Equinox of date position of star is 06:21:39.6 +07:20:55
Stellar brightness G=13.5, use SENSEUP=32
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 157 seconds.
The 1-sigma cross-track error in the shadow position is 1452 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 12:42UT)
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 13.5       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 5.0 sigma about the mid-time.
The median site spacing is 19.2 km RECON observability=1.0 and success probability=31.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Summerland 12:37:31 -20.7 Dark Down 46.3 197.4 Up 12:23:58 - 12:51:05 1327
Kelowna 12:37:30 -20.5 Dark Down 46.2 197.9 Up 12:23:57 - 12:51:04 1316
Penticton 12:37:32 -20.6 Dark Down 46.6 197.8 Up 12:23:59 - 12:51:06 1295
Okanagan Falls 12:37:33 -20.6 Dark Down 46.8 197.8 Up 12:23:59 - 12:51:06 1281
Oliver 12:37:33 -20.6 Dark Down 46.9 197.9 Up 12:24:00 - 12:51:07 1268
Anarchist Mountain Observatory 12:37:33 -20.5 Dark Down 47.1 198.3 Up 12:23:59 - 12:51:06 1247
Oroville 12:37:33 -20.6 Dark Down 47.1 198.2 Up 12:24:00 - 12:51:07 1244
Tonasket 12:37:34 -20.6 Dark Down 47.4 198.3 Up 12:24:00 - 12:51:07 1225
Okanogan 12:37:35 -20.7 Dark Down 47.7 198.2 Up 12:24:01 - 12:51:08 1205
Brewster 12:37:37 -20.8 Dark Down 48.0 198.0 Up 12:24:03 - 12:51:10 1192
Manson/Chelan 12:37:40 -21.1 Dark Down 48.3 197.5 Up 12:24:07 - 12:51:14 1190
Entiat 12:37:40 -21.1 Dark Down 48.5 197.5 Up 12:24:07 - 12:51:14 1176
Wenatchee 12:37:40 -21.2 Dark Down 48.8 197.4 Up 12:24:07 - 12:51:14 1160
Ellensburg 12:37:44 -21.4 Dark Down 49.2 197.3 Up 12:24:10 - 12:51:17 1136
Yakima 12:37:45 -21.4 Dark Down 49.6 197.4 Up 12:24:12 - 12:51:19 1105
Toppenish/White Swan 12:37:44 -21.3 Dark Down 49.8 197.7 Up 12:24:11 - 12:51:18 1080
Goldendale 12:37:50 -21.6 Dark Down 50.4 197.3 Up 12:24:16 - 12:51:23 1054
The Dalles 12:37:51 -21.9 Dark Down 50.7 196.8 Up 12:24:17 - 12:51:24 1052
Pasco 12:37:38 -20.4 Dark Down 49.6 199.6 Up 12:24:05 - 12:51:12 1018
Maupin 12:37:52 -21.8 Dark Down 51.0 197.2 Up 12:24:18 - 12:51:25 1014
George/Umatilla 12:37:41 -20.6 Dark Down 50.0 199.5 Up 12:24:07 - 12:51:14 1000
PNWRO 12:37:38 -20.3 Dark Down 49.8 200.1 Up 12:24:05 - 12:51:12 989
Madras/Culver 12:37:53 -21.9 Dark Down 51.6 197.3 Up 12:24:20 - 12:51:27 972
Sisters 12:37:57 -22.2 Dark Down 52.0 196.8 Up 12:24:23 - 12:51:30 964
Redmond 12:37:55 -21.9 Dark Down 51.9 197.4 Up 12:24:22 - 12:51:29 945
Bend 12:37:57 -22.0 Dark Down 52.2 197.3 Up 12:24:23 - 12:51:30 934
Oregon Observatory 12:37:58 -22.1 Dark Down 52.3 197.1 Up 12:24:25 - 12:51:32 926
La Pine/Gilchrist 12:37:59 -22.2 Dark Down 52.6 197.1 Up 12:24:26 - 12:51:33 912
North Lake 12:37:57 -21.7 Dark Down 52.8 198.2 Up 12:24:24 - 12:51:31 850
Chiloquin 12:38:04 -22.5 Dark Down 53.7 197.0 Up 12:24:31 - 12:51:38 837
Klamath Falls 12:38:05 -22.4 Dark Down 54.0 197.3 Up 12:24:31 - 12:51:38 805
Paisley 12:37:58 -21.5 Dark Down 53.3 199.1 Up 12:24:24 - 12:51:31 788
Tulelake 12:38:04 -22.2 Dark Down 54.2 197.9 Up 12:24:31 - 12:51:38 769
Lakeview 12:37:58 -21.4 Dark Down 53.7 199.6 Up 12:24:24 - 12:51:31 738
Fall River/Burney 12:38:07 -22.1 Dark Down 55.0 198.4 Up 12:24:34 - 12:51:41 690
Cedarville 12:37:58 -21.2 Dark Down 54.3 200.2 Up 12:24:25 - 12:51:32 675
Susanville 12:38:05 -21.6 Dark Down 55.4 200.0 Up 12:24:31 - 12:51:38 604
Greenville 12:38:07 -21.8 Dark Down 55.8 199.6 Up 12:24:34 - 12:51:41 594
Gimple 12:38:07 -21.8 Dark Down 55.8 199.8 Up 12:24:33 - 12:51:40 590
Quincy 12:38:09 -21.8 Dark Down 56.0 199.7 Up 12:24:35 - 12:51:42 577
Portola 12:38:06 -21.5 Dark Down 56.0 200.6 Up 12:24:32 - 12:51:39 544
Reno 12:38:03 -21.0 Dark Down 56.0 201.8 Up 12:24:30 - 12:51:37 491
Carson City 12:38:04 -20.9 Dark Down 56.4 202.1 Up 12:24:31 - 12:51:38 460
Gardnerville 12:38:05 -20.9 Dark Down 56.6 202.3 Up 12:24:31 - 12:51:38 437
Yerington 12:38:01 -20.4 Dark Down 56.3 203.3 Up 12:24:28 - 12:51:35 414
Hawthorne 12:38:00 -20.0 Dark Down 56.6 204.4 Up 12:24:27 - 12:51:34 349
Lee Vining 12:38:05 -20.4 Dark Down 57.3 204.0 Up 12:24:31 - 12:51:38 323
Tonopah 12:37:53 -18.9 Dark Down 56.6 207.1 Up 12:24:20 - 12:51:27 242
Bishop 12:38:02 -19.8 Dark Down 57.6 205.6 Up 12:24:29 - 12:51:36 236
CPSLO 12:38:23 -21.5 Dark Down 60.2 203.1 Up 12:24:49 - 12:51:56 165
Lone Pine 12:38:03 -19.5 Dark Down 58.1 206.7 Up 12:24:30 - 12:51:37 154
Beatty 12:37:55 -18.5 Dark Down 57.4 208.7 Up 12:24:21 - 12:51:28 119
Indian Springs 12:37:49 -17.6 AT Down 57.3 210.7 Up 12:24:16 - 12:51:23 39
Henderson 12:37:47 -17.0 AT Down 57.4 212.3 Up 12:24:14 - 12:51:21 -41
Wildwood 12:38:15 -19.8 Dark Down 60.6 207.8 Up 12:24:42 - 12:51:49 -43
Niwot 12:36:41 -10.1 NT Down 49.6 222.9 Up 12:23:08 - 12:50:15 -91
Searchlight/Boulder City 12:37:49 -16.9 AT Down 57.9 212.9 Up 12:24:15 - 12:51:22 -96
SwRI 12:36:42 -10.1 NT Down 49.8 222.9 Up 12:23:09 - 12:50:16 -97
Laughlin/Bullhead City 12:37:47 -16.6 AT Down 58.0 213.8 Up 12:24:14 - 12:51:21 -139
Patrick 12:37:42 -16.1 AT Down 57.5 214.7 Up 12:24:09 - 12:51:16 -150
Kingman/Dolan Springs 12:37:44 -16.2 AT Down 57.7 214.6 Up 12:24:11 - 12:51:18 -161
Mohave Valley 12:37:48 -16.6 AT Down 58.2 214.0 Up 12:24:15 - 12:51:22 -164
Idyllwild 12:38:05 -18.2 Dark Down 60.1 211.5 Up 12:24:31 - 12:51:38 -167
DCO 12:37:39 -15.5 AT Down 57.4 216.1 Up 12:24:06 - 12:51:13 -211
Lake Havasu City 12:37:48 -16.4 AT Down 58.4 214.8 Up 12:24:15 - 12:51:22 -213
Parker 12:37:49 -16.3 AT Down 58.7 215.2 Up 12:24:15 - 12:51:22 -246
Blythe 12:37:53 -16.5 AT Down 59.3 215.2 Up 12:24:19 - 12:51:26 -280
Calipatria 12:38:00 -17.2 AT Down 60.1 214.1 Up 12:24:26 - 12:51:33 -280
Yuma 12:37:56 -16.4 AT Down 60.0 216.1 Up 12:24:23 - 12:51:30 -363

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 12:42UT)
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 13.5       138
Positions are for J2000

Event circumstances last updated at 2019/01/29 21:41:53 UT

Marc W. Buie, Southwest Research Institute

RECON