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 04:43:00 UTC

J2000 position of star is 06:09:53.4 +23:55:59
Equinox of date position of star is 06:10:59.1 +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 659 seconds.
The 1-sigma cross-track error in the shadow position is 2533 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 1.4 sigma about the mid-time.
The median site spacing is 23.6 km RECON observability=1.0 and success probability=0.8%
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 9947
Tonasket 04:45:22 -45.3 Dark Up 40.1 98.9 Up 04:30:22 - 05:00:22 9926
Okanogan 04:45:24 -45.3 Dark Up 40.0 98.5 Up 04:30:24 - 05:00:24 9900
Brewster 04:45:24 -45.3 Dark Up 40.0 98.1 Up 04:30:24 - 05:00:24 9881
Manson/Chelan 04:45:25 -45.1 Dark Up 39.7 97.6 Up 04:30:25 - 05:00:25 9871
Entiat 04:45:26 -45.1 Dark Up 39.7 97.4 Up 04:30:26 - 05:00:26 9854
Wenatchee 04:45:27 -45.1 Dark Up 39.7 97.1 Up 04:30:27 - 05:00:27 9834
Ellensburg 04:45:29 -45.1 Dark Up 39.6 96.6 Up 04:30:29 - 05:00:29 9802
Yakima 04:45:30 -45.2 Dark Up 39.6 96.3 Up 04:30:30 - 05:00:30 9766
Toppenish/White Swan 04:45:30 -45.3 Dark Up 39.8 96.2 Up 04:30:30 - 05:00:30 9743
Goldendale 04:45:33 -45.2 Dark Up 39.5 95.4 Up 04:30:33 - 05:00:33 9704
Pasco 04:45:28 -46.2 Dark Up 40.7 97.1 Up 04:30:28 - 05:00:28 9700
The Dalles 04:45:33 -45.0 Dark Up 39.3 95.0 Up 04:30:33 - 05:00:33 9693
George/Umatilla 04:45:29 -46.2 Dark Up 40.5 96.7 Up 04:30:29 - 05:00:29 9675
PNWRO 04:45:29 -46.4 Dark Up 40.8 97.1 Up 04:30:29 - 05:00:29 9672
Maupin 04:45:34 -45.2 Dark Up 39.4 94.7 Up 04:30:34 - 05:00:34 9652
Madras/Culver 04:45:36 -45.3 Dark Up 39.4 94.2 Up 04:30:36 - 05:00:36 9603
Sisters 04:45:37 -45.0 Dark Up 39.2 93.6 Up 04:30:37 - 05:00:37 9585
Redmond 04:45:37 -45.3 Dark Up 39.4 93.9 Up 04:30:37 - 05:00:37 9572
Bend 04:45:38 -45.2 Dark Up 39.4 93.6 Up 04:30:38 - 05:00:38 9556
Oregon Observatory 04:45:38 -45.2 Dark Up 39.3 93.4 Up 04:30:38 - 05:00:38 9544
La Pine/Gilchrist 04:45:39 -45.2 Dark Up 39.2 93.2 Up 04:30:39 - 05:00:39 9527
North Lake 04:45:39 -45.7 Dark Up 39.7 93.3 Up 04:30:39 - 05:00:39 9471
Chiloquin 04:45:42 -45.1 Dark Up 39.0 92.0 Up 04:30:42 - 05:00:42 9434
Paisley 04:45:39 -46.1 Dark Up 40.0 93.1 Up 04:30:39 - 05:00:39 9410
Klamath Falls 04:45:43 -45.2 Dark Up 39.1 91.8 Up 04:30:43 - 05:00:43 9400
Tulelake 04:45:43 -45.5 Dark Up 39.4 91.8 Up 04:30:43 - 05:00:43 9366
Lakeview 04:45:40 -46.3 Dark Up 40.2 92.8 Up 04:30:40 - 05:00:40 9357
Cedarville 04:45:42 -46.5 Dark Up 40.3 92.4 Up 04:30:42 - 05:00:42 9291
Fall River/Burney 04:45:45 -45.7 Dark Up 39.4 91.1 Up 04:30:45 - 05:00:45 9279
Susanville 04:45:44 -46.4 Dark Up 40.0 91.1 Up 04:30:44 - 05:00:44 9199
Greenville 04:45:46 -46.2 Dark Up 39.8 90.7 Up 04:30:46 - 05:00:46 9181
Gimple 04:45:46 -46.2 Dark Up 39.9 90.7 Up 04:30:46 - 05:00:46 9178
Quincy 04:45:46 -46.2 Dark Up 39.8 90.5 Up 04:30:46 - 05:00:46 9162
Portola 04:45:46 -46.6 Dark Up 40.2 90.7 Up 04:30:46 - 05:00:46 9136
Reno 04:45:45 -47.1 Dark Up 40.7 90.9 Up 04:30:45 - 05:00:45 9093
Carson City 04:45:46 -47.2 Dark Up 40.7 90.6 Up 04:30:46 - 05:00:46 9058
Gardnerville 04:45:47 -47.3 Dark Up 40.7 90.4 Up 04:30:47 - 05:00:47 9033
Yerington 04:45:45 -47.7 Dark Up 41.2 90.9 Up 04:30:45 - 05:00:45 9021
Hawthorne 04:45:45 -48.2 Dark Up 41.6 90.8 Up 04:30:45 - 05:00:45 8962
Lee Vining 04:45:47 -47.9 Dark Up 41.2 90.0 Up 04:30:47 - 05:00:47 8921
Tonopah 04:45:43 -49.3 Dark Up 42.7 91.2 Up 04:30:43 - 05:00:43 8877
Bishop 04:45:46 -48.5 Dark Up 41.8 89.9 Up 04:30:46 - 05:00:46 8842
Niwot 04:45:11 -57.8 Dark Up 51.7 102.1 Up 04:30:11 - 05:00:11 8788
Lone Pine 04:45:48 -48.8 Dark Up 42.1 89.4 Up 04:30:48 - 05:00:48 8758
Beatty 04:45:44 -49.8 Dark Up 43.1 90.5 Up 04:30:44 - 05:00:44 8751
CPSLO 04:45:56 -46.9 Dark Up 40.0 86.8 Up 04:30:56 - 05:00:56 8705
Indian Springs 04:45:43 -50.7 Dark Up 44.0 90.8 Up 04:30:43 - 05:00:43 8689
Henderson 04:45:43 -51.4 Dark Up 44.5 90.7 Up 04:30:43 - 05:00:43 8617
Searchlight/Boulder City 04:45:44 -51.5 Dark Up 44.6 90.2 Up 04:30:44 - 05:00:44 8558
Wildwood 04:45:54 -48.6 Dark Up 41.6 86.9 Up 04:30:54 - 05:00:54 8524
Patrick 04:45:41 -52.3 Dark Up 45.4 90.7 Up 04:30:41 - 05:00:41 8524
Laughlin/Bullhead City 04:45:43 -51.8 Dark Up 44.9 90.1 Up 04:30:43 - 05:00:43 8519
Kingman/Dolan Springs 04:45:41 -52.2 Dark Up 45.3 90.4 Up 04:30:41 - 05:00:41 8507
Mohave Valley 04:45:44 -51.8 Dark Up 44.9 89.8 Up 04:30:44 - 05:00:44 8491
DCO 04:45:40 -52.9 Dark Up 46.0 90.8 Up 04:30:40 - 05:00:40 8475
Lake Havasu City 04:45:44 -52.1 Dark Up 45.1 89.5 Up 04:30:44 - 05:00:44 8444
Idyllwild 04:45:51 -50.2 Dark Up 43.1 87.5 Up 04:30:51 - 05:00:51 8434
Parker 04:45:44 -52.1 Dark Up 45.1 89.2 Up 04:30:44 - 05:00:44 8408
Blythe 04:45:46 -51.9 Dark Up 44.9 88.5 Up 04:30:46 - 05:00:46 8363
Calipatria 04:45:49 -51.2 Dark Up 44.1 87.6 Up 04:30:49 - 05:00:49 8339
Yuma 04:45:48 -52.0 Dark Up 44.8 87.6 Up 04:30:48 - 05:00:48 8270

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 2017/12/05 19:07:01 UT

Marc W. Buie, Southwest Research Institute

RECON