RECON: TNO occultation with 19255

Event between (19255) 94VK8 and star UC4-570-025108 with event index number of 170887

Geocentric closest approach at 2018/12/16 04:42:59 UTC

J2000 position of star is 06:09:53.4 +23:55:59
Equinox of date position of star is 06:10:55.7 +23:55:43
Stellar brightness R=15.4, use SENSEUP=128
Star is 90 degrees from the moon. Moon is 57% illuminated.
TNO apparent brightness V=23.3

[RECON map]
TNO is 42.9 AU from the Sun and 41.9 AU from the Earth.
The TNO is moving 25.4 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 508 seconds.
The 1-sigma cross-track error in the shadow position is 2177 km.
The sky-plane scale is 30395.0 km/arcsec.

The TNO has an absolute magnitude Hv=7.0
Diameter=239.9 km assuming a 5% albedo -- 9.4 sec chord
Diameter=97.9 km assuming a 30% albedo -- 3.9 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 19255, (2018/12/16 04:43UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:11.9 +07:24:33  0.4 16.90  86
Alhena         06:38:48.4 +16:22:54  1.9  9.97  96
3 Gem          06:10:53.1 +23:06:31  5.5  0.82  90
PPM 095455     06:09:20.5 +23:51:26  8.3  0.40  90
PPM 095502     06:10:21.8 +23:53:07  9.4  0.16  90
19255          06:11:02.9 +23:55:42 15.4        91
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 1.8 sigma about the mid-time.
The median site spacing is 23.6 km RECON observability=1.0 and success probability=0.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 04:45:22 -45.2 Dark Up 40.1 99.1 Up 04:30:22 - 05:00:22 9940
Tonasket 04:45:22 -45.3 Dark Up 40.1 98.9 Up 04:30:22 - 05:00:22 9920
Okanogan 04:45:23 -45.3 Dark Up 40.0 98.5 Up 04:30:23 - 05:00:23 9894
Brewster 04:45:24 -45.3 Dark Up 40.0 98.1 Up 04:30:24 - 05:00:24 9874
Manson/Chelan 04:45:25 -45.1 Dark Up 39.7 97.6 Up 04:30:25 - 05:00:25 9865
Entiat 04:45:26 -45.1 Dark Up 39.7 97.4 Up 04:30:26 - 05:00:26 9847
Wenatchee 04:45:27 -45.1 Dark Up 39.7 97.1 Up 04:30:27 - 05:00:27 9827
Ellensburg 04:45:28 -45.1 Dark Up 39.6 96.6 Up 04:30:28 - 05:00:28 9795
Yakima 04:45:29 -45.2 Dark Up 39.6 96.3 Up 04:30:29 - 05:00:29 9759
Toppenish/White Swan 04:45:29 -45.3 Dark Up 39.8 96.2 Up 04:30:29 - 05:00:29 9736
Goldendale 04:45:32 -45.2 Dark Up 39.5 95.4 Up 04:30:32 - 05:00:32 9697
Pasco 04:45:27 -46.2 Dark Up 40.7 97.1 Up 04:30:27 - 05:00:27 9693
The Dalles 04:45:33 -45.0 Dark Up 39.3 95.0 Up 04:30:33 - 05:00:33 9686
George/Umatilla 04:45:29 -46.2 Dark Up 40.5 96.7 Up 04:30:29 - 05:00:29 9668
PNWRO 04:45:27 -46.4 Dark Up 40.8 97.1 Up 04:30:27 - 05:00:27 9665
Maupin 04:45:34 -45.2 Dark Up 39.4 94.7 Up 04:30:34 - 05:00:34 9645
Madras/Culver 04:45:35 -45.3 Dark Up 39.4 94.2 Up 04:30:35 - 05:00:35 9597
Sisters 04:45:37 -45.0 Dark Up 39.1 93.6 Up 04:30:37 - 05:00:37 9578
Redmond 04:45:36 -45.3 Dark Up 39.4 93.9 Up 04:30:36 - 05:00:36 9565
Bend 04:45:37 -45.2 Dark Up 39.4 93.6 Up 04:30:37 - 05:00:37 9549
Oregon Observatory 04:45:38 -45.2 Dark Up 39.3 93.4 Up 04:30:38 - 05:00:38 9537
La Pine/Gilchrist 04:45:38 -45.2 Dark Up 39.2 93.2 Up 04:30:38 - 05:00:38 9520
North Lake 04:45:37 -45.7 Dark Up 39.7 93.3 Up 04:30:37 - 05:00:37 9464
Chiloquin 04:45:41 -45.1 Dark Up 39.0 92.0 Up 04:30:41 - 05:00:41 9427
Paisley 04:45:39 -46.1 Dark Up 40.0 93.1 Up 04:30:39 - 05:00:39 9403
Klamath Falls 04:45:42 -45.2 Dark Up 39.1 91.8 Up 04:30:42 - 05:00:42 9393
Tulelake 04:45:42 -45.5 Dark Up 39.3 91.8 Up 04:30:42 - 05:00:42 9359
Lakeview 04:45:40 -46.3 Dark Up 40.2 92.8 Up 04:30:40 - 05:00:40 9351
Cedarville 04:45:41 -46.5 Dark Up 40.3 92.4 Up 04:30:41 - 05:00:41 9284
Fall River/Burney 04:45:44 -45.7 Dark Up 39.4 91.1 Up 04:30:44 - 05:00:44 9272
Susanville 04:45:44 -46.4 Dark Up 40.0 91.1 Up 04:30:44 - 05:00:44 9192
Greenville 04:45:46 -46.2 Dark Up 39.8 90.7 Up 04:30:46 - 05:00:46 9174
Gimple 04:45:45 -46.2 Dark Up 39.9 90.7 Up 04:30:45 - 05:00:45 9171
Quincy 04:45:45 -46.2 Dark Up 39.8 90.5 Up 04:30:45 - 05:00:45 9154
Portola 04:45:46 -46.6 Dark Up 40.2 90.7 Up 04:30:46 - 05:00:46 9129
Reno 04:45:44 -47.1 Dark Up 40.7 90.9 Up 04:30:44 - 05:00:44 9086
Carson City 04:45:45 -47.2 Dark Up 40.7 90.6 Up 04:30:45 - 05:00:45 9050
Gardnerville 04:45:46 -47.2 Dark Up 40.7 90.4 Up 04:30:46 - 05:00:46 9026
Yerington 04:45:45 -47.7 Dark Up 41.2 90.9 Up 04:30:45 - 05:00:45 9014
Hawthorne 04:45:45 -48.2 Dark Up 41.6 90.8 Up 04:30:45 - 05:00:45 8955
Lee Vining 04:45:47 -47.9 Dark Up 41.2 90.0 Up 04:30:47 - 05:00:47 8913
Tonopah 04:45:43 -49.3 Dark Up 42.7 91.2 Up 04:30:43 - 05:00:43 8870
Bishop 04:45:46 -48.5 Dark Up 41.8 89.9 Up 04:30:46 - 05:00:46 8835
Niwot 04:45:11 -57.8 Dark Up 51.7 102.1 Up 04:30:11 - 05:00:11 8783
Lone Pine 04:45:48 -48.8 Dark Up 42.1 89.4 Up 04:30:48 - 05:00:48 8750
Beatty 04:45:44 -49.8 Dark Up 43.1 90.5 Up 04:30:44 - 05:00:44 8744
CPSLO 04:45:55 -46.9 Dark Up 40.0 86.8 Up 04:30:55 - 05:00:55 8697
Indian Springs 04:45:42 -50.7 Dark Up 44.0 90.8 Up 04:30:42 - 05:00:42 8682
Henderson 04:45:42 -51.4 Dark Up 44.5 90.7 Up 04:30:42 - 05:00:42 8610
Searchlight/Boulder City 04:45:42 -51.5 Dark Up 44.6 90.2 Up 04:30:42 - 05:00:42 8551
Patrick 04:45:40 -52.3 Dark Up 45.4 90.7 Up 04:30:40 - 05:00:40 8517
Wildwood 04:45:54 -48.6 Dark Up 41.6 86.9 Up 04:30:54 - 05:00:54 8516
Laughlin/Bullhead City 04:45:42 -51.8 Dark Up 44.9 90.1 Up 04:30:42 - 05:00:42 8511
Kingman/Dolan Springs 04:45:41 -52.2 Dark Up 45.3 90.4 Up 04:30:41 - 05:00:41 8500
Mohave Valley 04:45:43 -51.8 Dark Up 44.9 89.8 Up 04:30:43 - 05:00:43 8484
DCO 04:45:39 -52.9 Dark Up 46.0 90.8 Up 04:30:39 - 05:00:39 8468
Lake Havasu City 04:45:43 -52.1 Dark Up 45.1 89.5 Up 04:30:43 - 05:00:43 8436
Idyllwild 04:45:50 -50.2 Dark Up 43.1 87.5 Up 04:30:50 - 05:00:50 8426
Parker 04:45:44 -52.1 Dark Up 45.1 89.2 Up 04:30:44 - 05:00:44 8400
Blythe 04:45:45 -51.9 Dark Up 44.9 88.5 Up 04:30:45 - 05:00:45 8355
Calipatria 04:45:48 -51.2 Dark Up 44.1 87.6 Up 04:30:48 - 05:00:48 8331
Yuma 04:45:47 -52.0 Dark Up 44.8 87.6 Up 04:30:47 - 05:00:47 8262

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 19255, (2018/12/16 04:43UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 16.90  86
Alhena         06:37:42.8 +16:23:57  1.9  9.97  96
3 Gem          06:09:44.0 +23:06:48  5.5  0.82  90
PPM 095455     06:08:11.0 +23:51:40  8.3  0.40  90
PPM 095502     06:09:12.3 +23:53:24  9.4  0.16  90
19255          06:09:53.4 +23:55:59 15.4        90
Positions are for J2000

Event circumstances last updated at 2017/01/01 19:04:16 UT

Marc W. Buie, Southwest Research Institute

RECON