RECON: TNO occultation with 456826

Event between (456826) 07TH422 and star UC4-521-011992 with event index number of 104254

Geocentric closest approach at 2017/12/09 05:23:06 UTC

J2000 position of star is 05:20:26.7 +14:11:51
Equinox of date position of star is 05:21:22.0 +14:12:46
Stellar brightness R=14.9
Star is 74 degrees from the moon. Moon is 62% illuminated.
TNO apparent brightness V=22.2

[RECON map]
TNO is 29.2 AU from the Sun and 28.3 AU from the Earth.
The TNO is moving 24.9 km/sec on the sky relative to the star, or, 4.4 arcsec/hr.
The 1-sigma error in the time of the event is 107 seconds.
The 1-sigma cross-track error in the shadow position is 1853 km.

The TNO has an absolute magnitude Hv=7.6
Diameter=182.0 km assuming a 5% albedo -- 7.3 sec chord
Diameter=74.3 km assuming a 30% albedo -- 3.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 456826, (2017/12/09 05:23UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:08.6 +07:24:32  0.4 10.90  66
Bellatrix      05:26:05.6 +06:21:52  1.6  7.93  74
PPM 120962     05:28:15.5 +15:16:18  6.1  1.95  72
PPM 120823     05:20:08.9 +14:30:37  8.4  0.43  74
PPM 120838     05:21:14.7 +14:13:52  9.2  0.06  74
456826         05:21:27.9 +14:12:51 14.9        73
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 23.9 km RECON observability=1.0 and success probability=18.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 05:25:01 -51.3 Dark Down 42.2 122.5 Up 05:15:37 - 05:34:25 -1228
Tonasket 05:25:01 -51.4 Dark Down 42.3 122.3 Up 05:15:37 - 05:34:25 -1249
Okanogan 05:25:02 -51.5 Dark Down 42.4 121.9 Up 05:15:38 - 05:34:26 -1278
Brewster 05:25:03 -51.5 Dark Down 42.5 121.5 Up 05:15:39 - 05:34:27 -1300
Manson/Chelan 05:25:05 -51.4 Dark Down 42.4 120.9 Up 05:15:41 - 05:34:29 -1315
Entiat 05:25:05 -51.5 Dark Down 42.4 120.7 Up 05:15:41 - 05:34:29 -1334
Wenatchee 05:25:06 -51.5 Dark Down 42.5 120.4 Up 05:15:42 - 05:34:30 -1356
Ellensburg 05:25:07 -51.6 Dark Down 42.6 119.8 Up 05:15:43 - 05:34:31 -1391
Yakima 05:25:08 -51.8 Dark Down 42.8 119.5 Up 05:15:44 - 05:34:32 -1428
Toppenish/White Swan 05:25:08 -52.0 Dark Down 43.0 119.5 Up 05:15:44 - 05:34:32 -1449
Pasco 05:25:05 -52.8 Dark Down 43.8 120.7 Up 05:15:41 - 05:34:29 -1473
PNWRO 05:25:05 -53.0 Dark Down 44.1 120.7 Up 05:15:41 - 05:34:29 -1498
George/Umatilla 05:25:06 -52.8 Dark Down 43.8 120.2 Up 05:15:42 - 05:34:30 -1502
Goldendale 05:25:10 -51.9 Dark Down 43.0 118.6 Up 05:15:46 - 05:34:34 -1495
The Dalles 05:25:12 -51.8 Dark Down 42.9 118.0 Up 05:15:48 - 05:34:36 -1512
Maupin 05:25:12 -52.0 Dark Down 43.1 117.8 Up 05:15:48 - 05:34:36 -1552
Madras/Culver 05:25:13 -52.2 Dark Down 43.4 117.3 Up 05:15:49 - 05:34:37 -1602
Sisters 05:25:15 -52.0 Dark Down 43.2 116.6 Up 05:15:51 - 05:34:39 -1628
Redmond 05:25:14 -52.3 Dark Down 43.5 117.0 Up 05:15:50 - 05:34:38 -1635
Bend 05:25:15 -52.3 Dark Down 43.5 116.6 Up 05:15:51 - 05:34:39 -1653
Oregon Observatory 05:25:16 -52.3 Dark Down 43.5 116.4 Up 05:15:52 - 05:34:40 -1668
LaPine/Gilchrist 05:25:16 -52.3 Dark Down 43.6 116.1 Up 05:15:52 - 05:34:40 -1686
North Lake 05:25:16 -52.9 Dark Down 44.2 116.3 Up 05:15:52 - 05:34:40 -1734
Paisley 05:25:16 -53.3 Dark Down 44.6 116.2 Up 05:15:52 - 05:34:40 -1790
Chiloquin 05:25:19 -52.5 Dark Down 43.8 114.8 Up 05:15:55 - 05:34:43 -1787
Klamath Falls 05:25:20 -52.6 Dark Down 44.0 114.6 Up 05:15:56 - 05:34:44 -1821
Lakeview 05:25:16 -53.6 Dark Down 45.0 116.0 Up 05:15:52 - 05:34:40 -1840
Tulelake 05:25:19 -52.9 Dark Down 44.3 114.7 Up 05:15:55 - 05:34:43 -1850
Cedarville 05:25:17 -54.0 Dark Down 45.4 115.5 Up 05:15:53 - 05:34:41 -1905
Fall River/Burney 05:25:21 -53.3 Dark Down 44.8 113.9 Up 05:15:57 - 05:34:45 -1938
Susanville 05:25:20 -54.0 Dark Down 45.5 114.1 Up 05:15:56 - 05:34:44 -2007
Greenville 05:25:21 -53.9 Dark Down 45.4 113.5 Up 05:15:57 - 05:34:45 -2031
Niwot 05:24:37 -64.6 Dark Down 55.5 131.4 Up 05:15:13 - 05:34:01 -2173
Quincy 05:25:22 -53.9 Dark Down 45.5 113.3 Up 05:15:58 - 05:34:46 -2051
Portola 05:25:20 -54.3 Dark Down 45.9 113.7 Up 05:15:56 - 05:34:44 -2068
Reno 05:25:20 -54.9 Dark Down 46.5 114.0 Up 05:15:56 - 05:34:44 -2102
Carson City 05:25:20 -55.0 Dark Down 46.6 113.7 Up 05:15:56 - 05:34:44 -2137
Yerington 05:25:19 -55.5 Dark Down 47.2 114.1 Up 05:15:55 - 05:34:43 -2163
Gardnerville 05:25:20 -55.1 Dark Down 46.8 113.5 Up 05:15:56 - 05:34:44 -2162
Hawthorne 05:25:18 -56.1 Dark Down 47.7 114.2 Up 05:15:54 - 05:34:42 -2215
Lee Vining 05:25:20 -55.9 Dark Down 47.6 113.2 Up 05:15:56 - 05:34:44 -2265
Tonopah 05:25:15 -57.2 Dark Down 48.9 115.1 Up 05:15:51 - 05:34:39 -2276
Bishop 05:25:19 -56.6 Dark Down 48.4 113.2 Up 05:15:55 - 05:34:43 -2333
Lone Pine 05:25:19 -57.0 Dark Down 48.9 112.8 Up 05:15:55 - 05:34:43 -2413
Beatty 05:25:15 -57.9 Dark Down 49.7 114.3 Up 05:15:51 - 05:34:39 -2397
Indian Springs 05:25:12 -58.9 Dark Down 50.7 115.0 Up 05:15:48 - 05:34:36 -2441
Henderson 05:25:11 -59.5 Dark Down 51.4 115.1 Up 05:15:47 - 05:34:35 -2503
Searchlight/Boulder City 05:25:12 -59.8 Dark Down 51.7 114.6 Up 05:15:48 - 05:34:36 -2562
CPSLO 05:25:28 -55.3 Dark Down 47.4 109.1 Up 05:16:04 - 05:34:52 -2515
Kingman/Dolan Springs 05:25:09 -60.5 Dark Down 52.4 115.1 Up 05:15:45 - 05:34:33 -2598
Laughlin/Bullhead City 05:25:11 -60.1 Dark Down 52.1 114.6 Up 05:15:47 - 05:34:35 -2596
DCO 05:25:07 -61.2 Dark Down 53.1 115.9 Up 05:15:43 - 05:34:31 -2616
Mohave Valley 05:25:11 -60.2 Dark Down 52.2 114.2 Up 05:15:47 - 05:34:35 -2624
Lake Havasu City 05:25:11 -60.5 Dark Down 52.5 114.0 Up 05:15:47 - 05:34:35 -2667
Parker 05:25:12 -60.6 Dark Down 52.7 113.6 Up 05:15:48 - 05:34:36 -2704
Idyllwild 05:25:20 -58.8 Dark Down 51.0 110.9 Up 05:15:56 - 05:34:44 -2720
Blythe 05:25:13 -60.5 Dark Down 52.7 112.7 Up 05:15:49 - 05:34:37 -2755
Calipatria 05:25:16 -59.8 Dark Down 52.1 111.2 Up 05:15:52 - 05:34:40 -2796
Yuma 05:25:14 -60.7 Dark Down 53.0 111.5 Up 05:15:50 - 05:34:38 -2850

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.

Event circumstances last updated at 2016/03/21 17:23:06 UT

Marc W. Buie, Southwest Research Institute

RECON