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 02:43:40 UTC

J2000 position of star is 06:05:32.9 +07:21:45
Equinox of date position of star is 06:06:31.8 +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=20.1

[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 74 seconds.
The 1-sigma cross-track error in the shadow position is 1063 km.
The sky-plane scale is 21052.2 km/arcsec.

The TNO has an absolute magnitude Hv=5.3
Diameter=478.6 km assuming a 5% albedo -- 21.6 sec chord
Diameter=195.4 km assuming a 30% albedo -- 8.8 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2018/12/27 02:44UT)
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 33.8 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 02:46:29 -25.1 Dark Down 16.3 97.6 Really Low 02:39:49 - 02:53:09 6188
Tonasket 02:46:30 -25.0 Dark Down 16.3 97.5 Really Low 02:39:50 - 02:53:10 6170
Okanogan 02:46:30 -24.9 Dark Down 16.2 97.3 Really Low 02:39:50 - 02:53:10 6145
Brewster 02:46:32 -24.7 Dark Down 16.1 97.1 Really Low 02:39:52 - 02:53:12 6126
Manson/Chelan 02:46:33 -24.5 Dark Down 15.9 96.7 Really Low 02:39:53 - 02:53:13 6113
Entiat 02:46:33 -24.4 Dark Down 15.9 96.6 Really Low 02:39:53 - 02:53:13 6096
Wenatchee 02:46:34 -24.3 Dark Down 15.9 96.5 Really Low 02:39:54 - 02:53:14 6077
Ellensburg 02:46:36 -24.1 Dark Down 15.8 96.2 Really Low 02:39:56 - 02:53:16 6047
Yakima 02:46:37 -24.0 Dark Down 15.8 96.1 Really Low 02:39:57 - 02:53:17 6015
Toppenish/White Swan 02:46:37 -24.1 Dark Down 15.9 96.1 Really Low 02:39:57 - 02:53:17 5996
Pasco 02:46:37 -24.9 Dark Down 16.8 97.0 Really Low 02:39:57 - 02:53:17 5975
Goldendale 02:46:40 -23.7 Dark Down 15.7 95.7 Really Low 02:40:00 - 02:53:20 5956
PNWRO 02:46:37 -25.1 Dark Down 17.0 97.1 Really Low 02:39:57 - 02:53:17 5953
George/Umatilla 02:46:38 -24.7 Dark Down 16.7 96.8 Really Low 02:39:58 - 02:53:18 5950
The Dalles 02:46:41 -23.4 Dark Down 15.5 95.3 Really Low 02:40:01 - 02:53:21 5941
Maupin 02:46:42 -23.4 Dark Down 15.6 95.3 Really Low 02:40:02 - 02:53:22 5906
Madras/Culver 02:46:44 -23.3 Dark Down 15.6 95.1 Really Low 02:40:04 - 02:53:24 5862
Sisters 02:46:45 -22.9 Dark Down 15.3 94.7 Really Low 02:40:05 - 02:53:25 5839
Redmond 02:46:45 -23.2 Dark Down 15.6 95.0 Really Low 02:40:05 - 02:53:25 5833
Bend 02:46:46 -23.1 Dark Down 15.5 94.8 Really Low 02:40:06 - 02:53:26 5816
Oregon Observatory 02:46:46 -23.0 Dark Down 15.5 94.7 Really Low 02:40:06 - 02:53:26 5803
La Pine/Gilchrist 02:46:47 -22.9 Dark Down 15.4 94.6 Really Low 02:40:07 - 02:53:27 5787
North Lake 02:46:48 -23.2 Dark Down 15.9 94.9 Really Low 02:40:08 - 02:53:28 5745
Chiloquin 02:46:50 -22.4 Dark Down 15.3 94.0 Really Low 02:40:10 - 02:53:30 5697
Paisley 02:46:49 -23.4 Dark Down 16.2 95.0 Really Low 02:40:09 - 02:53:29 5695
Klamath Falls 02:46:51 -22.4 Dark Down 15.4 94.0 Really Low 02:40:11 - 02:53:31 5667
Lakeview 02:46:50 -23.4 Dark Down 16.4 95.0 Really Low 02:40:10 - 02:53:30 5650
Tulelake 02:46:52 -22.6 Dark Down 15.6 94.1 Really Low 02:40:12 - 02:53:32 5641
Cedarville 02:46:52 -23.4 Dark Down 16.6 94.9 Really Low 02:40:12 - 02:53:32 5592
Fall River/Burney 02:46:54 -22.4 Dark Down 15.7 93.9 Really Low 02:40:14 - 02:53:34 5563
Susanville 02:46:55 -22.9 Dark Down 16.3 94.3 Really Low 02:40:15 - 02:53:35 5500
Greenville 02:46:57 -22.6 Dark Down 16.1 94.0 Really Low 02:40:17 - 02:53:37 5479
Gimple 02:46:57 -22.7 Dark Down 16.2 94.0 Really Low 02:40:17 - 02:53:37 5478
Quincy 02:46:57 -22.6 Dark Down 16.2 93.9 Really Low 02:40:17 - 02:53:37 5461
Portola 02:46:57 -22.9 Dark Down 16.5 94.2 Really Low 02:40:17 - 02:53:37 5445
Reno 02:46:57 -23.3 Dark Down 17.1 94.6 Really Low 02:40:17 - 02:53:37 5415
Carson City 02:46:58 -23.3 Dark Down 17.1 94.5 Really Low 02:40:18 - 02:53:38 5383
Gardnerville 02:46:59 -23.3 Dark Down 17.2 94.4 Really Low 02:40:19 - 02:53:39 5361
Yerington 02:46:58 -23.7 Dark Down 17.6 94.8 Really Low 02:40:18 - 02:53:38 5359
Niwot 02:46:35 -34.5 Dark Down 28.0 104.9 Low 02:39:55 - 02:53:15 5325
Hawthorne 02:46:59 -24.0 Dark Down 18.1 95.0 Really Low 02:40:19 - 02:53:39 5312
Lee Vining 02:47:01 -23.5 Dark Down 17.7 94.5 Really Low 02:40:21 - 02:53:41 5267
Tonopah 02:46:59 -25.0 Dark Down 19.2 95.8 Really Low 02:40:19 - 02:53:39 5256
Bishop 02:47:02 -24.0 Dark Down 18.4 94.8 Really Low 02:40:22 - 02:53:42 5205
Beatty 02:47:01 -25.2 Dark Down 19.7 95.7 Really Low 02:40:21 - 02:53:41 5146
Lone Pine 02:47:03 -24.1 Dark Down 18.7 94.8 Really Low 02:40:23 - 02:53:43 5132
Indian Springs 02:47:00 -26.0 Dark Down 20.6 96.2 Low 02:40:20 - 02:53:40 5104
Henderson 02:47:01 -26.4 Dark Down 21.2 96.5 Low 02:40:21 - 02:53:41 5048
CPSLO 02:47:09 -21.8 Dark Down 16.7 92.8 Really Low 02:40:29 - 02:53:49 5040
Searchlight/Boulder City 02:47:02 -26.4 Dark Down 21.3 96.3 Low 02:40:22 - 02:53:42 4994
Patrick 02:47:01 -27.2 Dark Down 22.2 96.9 Low 02:40:21 - 02:53:41 4978
Laughlin/Bullhead City 02:47:02 -26.6 Dark Down 21.6 96.4 Low 02:40:22 - 02:53:42 4962
Kingman/Dolan Springs 02:47:02 -27.0 Dark Down 22.1 96.7 Low 02:40:22 - 02:53:42 4959
DCO 02:47:01 -27.7 Dark Down 22.8 97.2 Low 02:40:21 - 02:53:41 4942
Mohave Valley 02:47:03 -26.5 Dark Down 21.7 96.3 Low 02:40:23 - 02:53:43 4937
Wildwood 02:47:10 -23.1 Dark Down 18.5 93.6 Really Low 02:40:30 - 02:53:50 4904
Lake Havasu City 02:47:03 -26.7 Dark Down 21.9 96.3 Low 02:40:23 - 02:53:43 4896
Parker 02:47:04 -26.6 Dark Down 22.0 96.1 Low 02:40:24 - 02:53:44 4863
Idyllwild 02:47:09 -24.6 Dark Down 20.1 94.6 Low 02:40:29 - 02:53:49 4850
Blythe 02:47:06 -26.3 Dark Down 21.8 95.8 Low 02:40:26 - 02:53:46 4816
Calipatria 02:47:09 -25.4 Dark Down 21.1 95.0 Low 02:40:29 - 02:53:49 4779
Yuma 02:47:08 -26.1 Dark Down 21.9 95.4 Low 02:40:28 - 02:53:48 4728

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 02:44UT)
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 2018/02/14 17:17:50 UT

Marc W. Buie, Southwest Research Institute

RECON