RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star UC4-487-017154 with event index number of 171972

Geocentric closest approach at 2018/12/27 02:42:50 UTC

J2000 position of star is 06:05:32.9 +07:21:45
Equinox of date position of star is 06:06:31.2 +07:21:36
Stellar brightness R=15.4, use SENSEUP=128
Star is 66 degrees from the moon. Moon is 75% illuminated.
TNO apparent brightness V=20.3

[RECON map]
TNO is 30.0 AU from the Sun and 29.0 AU from the Earth.
The TNO is moving 24.3 km/sec on the sky relative to the star, or, 4.2 arcsec/hr.
The 1-sigma error in the time of the event is 91 seconds.
The 1-sigma cross-track error in the shadow position is 1070 km.
The sky-plane scale is 21052.3 km/arcsec.

The TNO has an absolute magnitude Hv=5.5
Diameter=478.6 km assuming a 5% albedo -- 19.7 sec chord
Diameter=195.4 km assuming a 30% albedo -- 8.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2018/12/27 02:43UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:12.0 +07:24:33  0.4  2.57  69
Bellatrix      05:26:09.0 +06:21:55  1.6 10.08  76
63 Ori         06:05:58.9 +05:25:03  6.4  1.95  67
PPM 149872     06:06:11.3 +07:07:31  7.7  0.25  66
PPM 149882     06:06:43.9 +07:13:50 10.0  0.13  66
55638          06:06:34.6 +07:21:35 15.4        66
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 37.0 km RECON observability=0.2 and success probability=0.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 02:45:39 -24.9 Dark Down 16.1 97.4 Really Low 02:37:34 - 02:53:44 5983
Tonasket 02:45:40 -24.9 Dark Down 16.2 97.3 Really Low 02:37:35 - 02:53:45 5965
Okanogan 02:45:42 -24.8 Dark Down 16.1 97.1 Really Low 02:37:37 - 02:53:47 5941
Brewster 02:45:42 -24.6 Dark Down 16.0 96.9 Really Low 02:37:37 - 02:53:47 5921
Manson/Chelan 02:45:43 -24.3 Dark Down 15.8 96.6 Really Low 02:37:38 - 02:53:48 5908
Entiat 02:45:44 -24.3 Dark Down 15.8 96.4 Really Low 02:37:39 - 02:53:49 5892
Wenatchee 02:45:46 -24.2 Dark Down 15.7 96.3 Really Low 02:37:41 - 02:53:51 5873
Ellensburg 02:45:46 -23.9 Dark Down 15.6 96.0 Really Low 02:37:41 - 02:53:51 5842
Yakima 02:45:48 -23.9 Dark Down 15.7 95.9 Really Low 02:37:43 - 02:53:53 5810
Toppenish/White Swan 02:45:48 -24.0 Dark Down 15.8 96.0 Really Low 02:37:43 - 02:53:53 5791
Pasco 02:45:48 -24.8 Dark Down 16.7 96.9 Really Low 02:37:43 - 02:53:53 5770
Goldendale 02:45:50 -23.6 Dark Down 15.6 95.5 Really Low 02:37:45 - 02:53:55 5751
PNWRO 02:45:48 -24.9 Dark Down 16.9 97.0 Really Low 02:37:43 - 02:53:53 5748
George/Umatilla 02:45:49 -24.6 Dark Down 16.6 96.6 Really Low 02:37:44 - 02:53:54 5745
The Dalles 02:45:51 -23.3 Dark Down 15.3 95.2 Really Low 02:37:46 - 02:53:56 5736
Maupin 02:45:53 -23.3 Dark Down 15.5 95.1 Really Low 02:37:48 - 02:53:58 5701
Madras/Culver 02:45:54 -23.2 Dark Down 15.5 95.0 Really Low 02:37:49 - 02:53:59 5657
Sisters 02:45:56 -22.8 Dark Down 15.2 94.6 Really Low 02:37:51 - 02:54:01 5634
Redmond 02:45:55 -23.1 Dark Down 15.5 94.8 Really Low 02:37:50 - 02:54:00 5628
Bend 02:45:56 -22.9 Dark Down 15.4 94.7 Really Low 02:37:51 - 02:54:01 5612
Oregon Observatory 02:45:57 -22.8 Dark Down 15.3 94.5 Really Low 02:37:52 - 02:54:02 5599
La Pine/Gilchrist 02:45:57 -22.7 Dark Down 15.3 94.4 Really Low 02:37:52 - 02:54:02 5582
North Lake 02:45:58 -23.1 Dark Down 15.8 94.7 Really Low 02:37:53 - 02:54:03 5540
Chiloquin 02:46:01 -22.3 Dark Down 15.1 93.9 Really Low 02:37:56 - 02:54:06 5493
Paisley 02:46:00 -23.2 Dark Down 16.1 94.8 Really Low 02:37:55 - 02:54:05 5490
Klamath Falls 02:46:02 -22.3 Dark Down 15.2 93.9 Really Low 02:37:57 - 02:54:07 5463
Lakeview 02:46:01 -23.3 Dark Down 16.3 94.8 Really Low 02:37:56 - 02:54:06 5445
Tulelake 02:46:03 -22.4 Dark Down 15.5 94.0 Really Low 02:37:58 - 02:54:08 5437
Cedarville 02:46:03 -23.3 Dark Down 16.5 94.8 Really Low 02:37:58 - 02:54:08 5387
Fall River/Burney 02:46:05 -22.3 Dark Down 15.6 93.8 Really Low 02:38:00 - 02:54:10 5358
Susanville 02:46:06 -22.7 Dark Down 16.2 94.1 Really Low 02:38:01 - 02:54:11 5296
Greenville 02:46:08 -22.4 Dark Down 16.0 93.9 Really Low 02:38:03 - 02:54:13 5275
Gimple 02:46:07 -22.5 Dark Down 16.1 93.9 Really Low 02:38:02 - 02:54:12 5274
Quincy 02:46:08 -22.4 Dark Down 16.0 93.8 Really Low 02:38:03 - 02:54:13 5257
Portola 02:46:08 -22.7 Dark Down 16.4 94.1 Really Low 02:38:03 - 02:54:13 5241
Reno 02:46:08 -23.2 Dark Down 16.9 94.4 Really Low 02:38:03 - 02:54:13 5211
Carson City 02:46:09 -23.1 Dark Down 17.0 94.3 Really Low 02:38:04 - 02:54:14 5179
Gardnerville 02:46:10 -23.1 Dark Down 17.0 94.3 Really Low 02:38:05 - 02:54:15 5157
Yerington 02:46:09 -23.6 Dark Down 17.5 94.7 Really Low 02:38:04 - 02:54:14 5155
Niwot 02:45:46 -34.3 Dark Down 27.8 104.8 Low 02:37:41 - 02:53:51 5120
Hawthorne 02:46:10 -23.9 Dark Down 17.9 94.9 Really Low 02:38:05 - 02:54:15 5108
Lee Vining 02:46:11 -23.4 Dark Down 17.6 94.4 Really Low 02:38:06 - 02:54:16 5062
Tonopah 02:46:09 -24.9 Dark Down 19.1 95.6 Really Low 02:38:04 - 02:54:14 5051
Bishop 02:46:12 -23.8 Dark Down 18.2 94.7 Really Low 02:38:07 - 02:54:17 5001
Beatty 02:46:11 -25.0 Dark Down 19.5 95.5 Really Low 02:38:06 - 02:54:16 4941
Lone Pine 02:46:14 -23.9 Dark Down 18.5 94.6 Really Low 02:38:09 - 02:54:19 4928
Indian Springs 02:46:11 -25.8 Dark Down 20.4 96.1 Low 02:38:06 - 02:54:16 4900
Henderson 02:46:12 -26.2 Dark Down 21.1 96.3 Low 02:38:07 - 02:54:17 4843
CPSLO 02:46:20 -21.6 Dark Down 16.5 92.7 Really Low 02:38:15 - 02:54:25 4836
Searchlight/Boulder City 02:46:13 -26.2 Dark Down 21.2 96.1 Low 02:38:08 - 02:54:18 4789
Patrick 02:46:12 -27.0 Dark Down 22.0 96.8 Low 02:38:07 - 02:54:17 4773
Laughlin/Bullhead City 02:46:13 -26.4 Dark Down 21.5 96.2 Low 02:38:08 - 02:54:18 4758
Kingman/Dolan Springs 02:46:13 -26.8 Dark Down 21.9 96.6 Low 02:38:08 - 02:54:18 4754
DCO 02:46:12 -27.5 Dark Down 22.6 97.1 Low 02:38:07 - 02:54:17 4737
Mohave Valley 02:46:14 -26.4 Dark Down 21.5 96.1 Low 02:38:09 - 02:54:19 4732
Wildwood 02:46:21 -23.0 Dark Down 18.3 93.5 Really Low 02:38:16 - 02:54:26 4700
Lake Havasu City 02:46:15 -26.5 Dark Down 21.8 96.1 Low 02:38:10 - 02:54:20 4692
Parker 02:46:15 -26.4 Dark Down 21.8 96.0 Low 02:38:10 - 02:54:20 4658
Idyllwild 02:46:19 -24.4 Dark Down 19.9 94.5 Really Low 02:38:14 - 02:54:24 4645
Blythe 02:46:17 -26.1 Dark Down 21.6 95.6 Low 02:38:12 - 02:54:22 4612
Calipatria 02:46:19 -25.2 Dark Down 20.9 94.9 Low 02:38:14 - 02:54:24 4575
Yuma 02:46:19 -25.9 Dark Down 21.7 95.3 Low 02:38:14 - 02:54:24 4523

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, (2018/12/27 02:43UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  2.57  69
Bellatrix      05:25:07.8 +06:20:58  1.6 10.08  76
63 Ori         06:04:58.1 +05:25:12  6.4  1.95  67
PPM 149872     06:05:09.7 +07:07:40  7.7  0.25  66
PPM 149882     06:05:42.3 +07:14:00 10.0  0.13  66
55638          06:05:32.9 +07:21:45 15.4        66
Positions are for J2000

Event circumstances last updated at 2017/12/05 19:08:58 UT

Marc W. Buie, Southwest Research Institute

RECON