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 06:06:29.4 +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 73 seconds.
The 1-sigma cross-track error in the shadow position is 1062 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 37.1 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 02:39:07 - 02:52:12 5981
Tonasket 02:45:40 -24.9 Dark Down 16.2 97.3 Really Low 02:39:08 - 02:52:13 5963
Okanogan 02:45:41 -24.8 Dark Down 16.1 97.1 Really Low 02:39:09 - 02:52:14 5938
Brewster 02:45:42 -24.6 Dark Down 16.0 96.9 Really Low 02:39:10 - 02:52:15 5919
Manson/Chelan 02:45:43 -24.3 Dark Down 15.8 96.6 Really Low 02:39:11 - 02:52:16 5906
Entiat 02:45:45 -24.3 Dark Down 15.8 96.4 Really Low 02:39:12 - 02:52:17 5890
Wenatchee 02:45:45 -24.2 Dark Down 15.7 96.3 Really Low 02:39:13 - 02:52:18 5871
Ellensburg 02:45:46 -23.9 Dark Down 15.6 96.0 Really Low 02:39:14 - 02:52:19 5840
Yakima 02:45:48 -23.9 Dark Down 15.7 95.9 Really Low 02:39:15 - 02:52:20 5808
Toppenish/White Swan 02:45:48 -24.0 Dark Down 15.8 96.0 Really Low 02:39:16 - 02:52:21 5789
Pasco 02:45:48 -24.8 Dark Down 16.7 96.9 Really Low 02:39:15 - 02:52:20 5768
Goldendale 02:45:50 -23.6 Dark Down 15.6 95.5 Really Low 02:39:18 - 02:52:23 5749
PNWRO 02:45:48 -24.9 Dark Down 16.9 97.0 Really Low 02:39:16 - 02:52:21 5746
George/Umatilla 02:45:49 -24.6 Dark Down 16.6 96.6 Really Low 02:39:17 - 02:52:22 5743
The Dalles 02:45:52 -23.3 Dark Down 15.3 95.2 Really Low 02:39:19 - 02:52:24 5734
Maupin 02:45:53 -23.3 Dark Down 15.5 95.1 Really Low 02:39:20 - 02:52:25 5699
Madras/Culver 02:45:54 -23.2 Dark Down 15.5 95.0 Really Low 02:39:21 - 02:52:26 5655
Sisters 02:45:56 -22.8 Dark Down 15.2 94.6 Really Low 02:39:23 - 02:52:28 5632
Redmond 02:45:55 -23.1 Dark Down 15.5 94.8 Really Low 02:39:22 - 02:52:27 5626
Bend 02:45:56 -22.9 Dark Down 15.4 94.7 Really Low 02:39:23 - 02:52:28 5610
Oregon Observatory 02:45:56 -22.8 Dark Down 15.3 94.5 Really Low 02:39:24 - 02:52:29 5597
La Pine/Gilchrist 02:45:57 -22.7 Dark Down 15.3 94.4 Really Low 02:39:25 - 02:52:30 5581
North Lake 02:45:58 -23.1 Dark Down 15.8 94.7 Really Low 02:39:25 - 02:52:30 5538
Chiloquin 02:46:01 -22.3 Dark Down 15.1 93.9 Really Low 02:39:28 - 02:52:33 5491
Paisley 02:45:59 -23.2 Dark Down 16.1 94.8 Really Low 02:39:27 - 02:52:32 5488
Klamath Falls 02:46:01 -22.2 Dark Down 15.2 93.9 Really Low 02:39:29 - 02:52:34 5461
Lakeview 02:46:01 -23.3 Dark Down 16.3 94.8 Really Low 02:39:28 - 02:52:33 5444
Tulelake 02:46:02 -22.4 Dark Down 15.5 94.0 Really Low 02:39:30 - 02:52:35 5435
Cedarville 02:46:02 -23.3 Dark Down 16.5 94.8 Really Low 02:39:30 - 02:52:35 5386
Fall River/Burney 02:46:05 -22.3 Dark Down 15.6 93.8 Really Low 02:39:32 - 02:52:37 5356
Susanville 02:46:06 -22.7 Dark Down 16.2 94.1 Really Low 02:39:33 - 02:52:38 5294
Greenville 02:46:07 -22.4 Dark Down 16.0 93.9 Really Low 02:39:35 - 02:52:40 5273
Gimple 02:46:07 -22.5 Dark Down 16.1 93.9 Really Low 02:39:34 - 02:52:39 5272
Quincy 02:46:08 -22.4 Dark Down 16.0 93.8 Really Low 02:39:35 - 02:52:40 5255
Portola 02:46:08 -22.7 Dark Down 16.4 94.1 Really Low 02:39:35 - 02:52:40 5239
Reno 02:46:08 -23.2 Dark Down 16.9 94.4 Really Low 02:39:35 - 02:52:40 5209
Carson City 02:46:08 -23.1 Dark Down 16.9 94.3 Really Low 02:39:36 - 02:52:41 5177
Gardnerville 02:46:09 -23.1 Dark Down 17.0 94.3 Really Low 02:39:37 - 02:52:42 5155
Yerington 02:46:08 -23.6 Dark Down 17.5 94.7 Really Low 02:39:36 - 02:52:41 5153
Niwot 02:45:46 -34.3 Dark Down 27.8 104.8 Low 02:39:14 - 02:52:19 5119
Hawthorne 02:46:09 -23.9 Dark Down 17.9 94.9 Really Low 02:39:36 - 02:52:41 5106
Lee Vining 02:46:11 -23.4 Dark Down 17.6 94.4 Really Low 02:39:39 - 02:52:44 5061
Tonopah 02:46:09 -24.9 Dark Down 19.1 95.6 Really Low 02:39:37 - 02:52:42 5050
Bishop 02:46:12 -23.8 Dark Down 18.2 94.7 Really Low 02:39:39 - 02:52:44 4998
Beatty 02:46:11 -25.0 Dark Down 19.5 95.5 Really Low 02:39:39 - 02:52:44 4939
Lone Pine 02:46:14 -23.9 Dark Down 18.5 94.6 Really Low 02:39:41 - 02:52:46 4925
Indian Springs 02:46:11 -25.8 Dark Down 20.4 96.1 Low 02:39:38 - 02:52:43 4898
Henderson 02:46:11 -26.2 Dark Down 21.0 96.3 Low 02:39:39 - 02:52:44 4841
CPSLO 02:46:19 -21.6 Dark Down 16.5 92.7 Really Low 02:39:47 - 02:52:52 4833
Searchlight/Boulder City 02:46:12 -26.2 Dark Down 21.2 96.1 Low 02:39:40 - 02:52:45 4787
Patrick 02:46:11 -27.0 Dark Down 22.0 96.8 Low 02:39:39 - 02:52:44 4771
Laughlin/Bullhead City 02:46:13 -26.4 Dark Down 21.5 96.2 Low 02:39:40 - 02:52:45 4755
Kingman/Dolan Springs 02:46:12 -26.8 Dark Down 21.9 96.6 Low 02:39:39 - 02:52:44 4752
DCO 02:46:11 -27.5 Dark Down 22.6 97.1 Low 02:39:39 - 02:52:44 4735
Mohave Valley 02:46:13 -26.4 Dark Down 21.5 96.1 Low 02:39:41 - 02:52:46 4729
Wildwood 02:46:20 -23.0 Dark Down 18.3 93.5 Really Low 02:39:48 - 02:52:53 4697
Lake Havasu City 02:46:14 -26.5 Dark Down 21.8 96.1 Low 02:39:42 - 02:52:47 4689
Parker 02:46:15 -26.4 Dark Down 21.8 96.0 Low 02:39:43 - 02:52:48 4655
Idyllwild 02:46:19 -24.4 Dark Down 19.9 94.5 Really Low 02:39:46 - 02:52:51 4643
Blythe 02:46:16 -26.1 Dark Down 21.6 95.6 Low 02:39:44 - 02:52:49 4609
Calipatria 02:46:19 -25.2 Dark Down 20.9 94.9 Low 02:39:46 - 02:52:51 4572
Yuma 02:46:19 -25.9 Dark Down 21.7 95.3 Low 02:39:46 - 02:52:51 4521

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 2017/05/20 18:07:29 UT

Marc W. Buie, Southwest Research Institute

RECON