RECON: TNO occultation with 04MU8

Event between 04MU8 and star UC4-349-184030 with event index number of 78389

Geocentric closest approach at 2017/07/30 04:36:05 UTC

J2000 position of star is 20:24:16.3 -20:12:57
Equinox of date position of star is 20:25:12.6 -20:09:45
Stellar brightness R=14.8
Star is 92 degrees from the moon. Moon is 46% illuminated.
TNO apparent brightness V=22.8

[RECON map]
TNO is 47.7 AU from the Sun and 46.7 AU from the Earth.
The TNO is moving 25.1 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 618 seconds.
The 1-sigma cross-track error in the shadow position is 3178 km.

The TNO has an absolute magnitude Hv=6.1
Diameter=361.4 km assuming a 5% albedo -- 14.4 sec chord
Diameter=147.5 km assuming a 30% albedo -- 5.9 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 04MU8, (2017/07/30 04:36UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:37.1 -29:31:43  1.2 35.85 121
38Zet Sgr      19:03:43.7 -29:51:13  2.7 20.82  72
7Sig Cap       20:20:24.3 -19:03:45  5.3  1.59  90
PPM 271107     20:25:58.5 -19:57:13  8.2  0.26  92
PPM 271075     20:24:53.1 -20:10:32  8.9  0.10  91
04MU8          20:25:17.3 -20:09:29 14.8        92
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 17.8 km RECON observability=0.2 and success probability=3.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 04:37:12 -8.5 CT Up 8.7 135.0 Really Low 03:45:13 - 05:29:12 2754
Tonasket 04:37:13 -8.6 CT Up 8.8 134.9 Really Low 03:45:13 - 05:29:12 2746
Okanogan 04:37:14 -8.8 CT Up 9.0 134.8 Really Low 03:45:14 - 05:29:13 2734
Brewster 04:37:15 -8.8 CT Up 9.1 134.6 Really Low 03:45:16 - 05:29:15 2723
Manson/Chelan 04:37:17 -8.8 CT Up 9.1 134.3 Really Low 03:45:17 - 05:29:16 2714
Entiat 04:37:17 -8.9 CT Up 9.2 134.2 Really Low 03:45:18 - 05:29:17 2706
Wenatchee 04:37:19 -9.0 CT Up 9.3 134.1 Really Low 03:45:19 - 05:29:18 2696
Ellensburg 04:37:20 -9.2 CT Up 9.5 133.9 Really Low 03:45:21 - 05:29:20 2680
Yakima 04:37:21 -9.4 CT Up 9.8 133.8 Really Low 03:45:22 - 05:29:21 2665
Toppenish/White Swan 04:37:22 -9.7 CT Up 10.0 133.9 Really Low 03:45:22 - 05:29:21 2658
Pasco 04:37:19 -10.4 CT Up 10.7 134.9 Really Low 03:45:19 - 05:29:18 2662
PNWRO 04:37:19 -10.7 CT Up 11.0 135.1 Really Low 03:45:20 - 05:29:19 2654
George/Umatilla 04:37:20 -10.5 CT Up 10.8 134.7 Really Low 03:45:21 - 05:29:20 2648
Goldendale 04:37:24 -9.8 CT Up 10.2 133.5 Really Low 03:45:24 - 05:29:23 2634
The Dalles 04:37:26 -9.7 CT Up 10.1 133.2 Really Low 03:45:26 - 05:29:25 2622
Maupin 04:37:26 -10.1 CT Up 10.5 133.2 Really Low 03:45:27 - 05:29:26 2607
Madras/Culver 04:37:26 -10.4 CT Up 10.8 133.1 Really Low 03:45:27 - 05:29:26 2585
Sisters 04:37:26 -10.3 CT Up 10.8 132.7 Really Low 03:45:27 - 05:29:26 2570
Redmond 04:37:26 -10.6 CT Up 11.1 133.0 Really Low 03:45:27 - 05:29:26 2571
Bend 04:37:26 -10.6 CT Up 11.1 132.9 Really Low 03:45:27 - 05:29:26 2562
Oregon Observatory 04:37:26 -10.7 CT Up 11.2 132.8 Really Low 03:45:27 - 05:29:26 2555
LaPine/Gilchrist 04:37:26 -10.8 CT Up 11.3 132.7 Really Low 03:45:27 - 05:29:26 2546
North Lake 04:37:26 -11.4 CT Up 11.9 133.1 Really Low 03:45:27 - 05:29:26 2533
Paisley 04:37:26 -11.9 CT Up 12.5 133.3 Really Low 03:45:27 - 05:29:26 2512
Chiloquin 04:37:26 -11.3 CT Up 11.8 132.2 Really Low 03:45:27 - 05:29:26 2502
Klamath Falls 04:37:26 -11.5 CT Up 12.1 132.2 Really Low 03:45:27 - 05:29:26 2489
Lakeview 04:37:26 -12.4 AT Up 12.9 133.4 Really Low 03:45:27 - 05:29:26 2493
Tulelake 04:37:26 -11.9 CT Up 12.5 132.4 Really Low 03:45:27 - 05:29:26 2480
Cedarville 04:37:26 -12.9 AT Up 13.5 133.4 Really Low 03:45:27 - 05:29:26 2467
Fall River/Burney 04:37:26 -12.5 AT Up 13.1 132.3 Really Low 03:45:27 - 05:29:26 2445
Susanville 04:37:26 -13.3 AT Up 14.0 132.8 Really Low 03:45:27 - 05:29:26 2422
Greenville 04:37:26 -13.3 AT Up 14.0 132.5 Really Low 03:45:27 - 05:29:26 2411
Niwot 04:36:59 -21.8 Dark Up 21.9 145.6 Low 03:44:59 - 05:28:58 2441
Quincy 04:37:26 -13.4 AT Up 14.1 132.5 Really Low 03:45:27 - 05:29:26 2403
Portola 04:37:26 -13.8 AT Up 14.5 132.8 Really Low 03:45:27 - 05:29:26 2399
Reno 04:37:26 -14.4 AT Up 15.0 133.3 Really Low 03:45:27 - 05:29:26 2388
Carson City 04:37:26 -14.6 AT Up 15.3 133.2 Really Low 03:45:27 - 05:29:26 2373
Yerington 04:37:26 -15.1 AT Up 15.8 133.7 Really Low 03:45:27 - 05:29:26 2365
Gardnerville 04:37:26 -14.8 AT Up 15.5 133.2 Really Low 03:45:27 - 05:29:26 2364
Hawthorne 04:37:26 -15.7 AT Up 16.4 134.0 Really Low 03:45:27 - 05:29:26 2345
Lee Vining 04:37:26 -15.8 AT Up 16.5 133.5 Really Low 03:45:27 - 05:29:26 2323
Tonopah 04:37:26 -16.9 AT Up 17.5 135.0 Really Low 03:45:27 - 05:29:26 2323
Bishop 04:37:26 -16.6 AT Up 17.3 133.9 Really Low 03:45:27 - 05:29:26 2295
Lone Pine 04:37:26 -17.3 AT Up 18.1 134.0 Really Low 03:45:27 - 05:29:26 2262
Beatty 04:37:26 -17.9 AT Up 18.6 135.1 Really Low 03:45:27 - 05:29:26 2270
Indian Springs 04:37:26 -18.8 Dark Up 19.4 135.9 Really Low 03:45:27 - 05:29:26 2253
Henderson 04:37:26 -19.5 Dark Up 20.2 136.3 Low 03:45:27 - 05:29:26 2225
Searchlight/Boulder City 04:37:26 -20.0 Dark Up 20.7 136.2 Low 03:45:27 - 05:29:26 2198
CPSLO 04:37:52 -16.6 AT Up 17.5 131.8 Really Low 03:45:52 - 05:29:51 2135
Kingman/Dolan Springs 04:37:26 -20.7 Dark Up 21.3 136.9 Low 03:45:27 - 05:29:26 2181
Laughlin/Bullhead City 04:37:26 -20.4 Dark Up 21.1 136.4 Low 03:45:27 - 05:29:26 2181
DCO 04:37:26 -21.3 Dark Up 21.9 137.6 Low 03:45:27 - 05:29:26 2176
Mohave Valley 04:37:26 -20.6 Dark Up 21.3 136.4 Low 03:45:27 - 05:29:26 2168
Lake Havasu City 04:37:26 -21.0 Dark Up 21.7 136.5 Low 03:45:27 - 05:29:26 2147
Parker 04:37:26 -21.2 Dark Up 22.0 136.4 Low 03:45:27 - 05:29:26 2129
Idyllwild 04:37:45 -20.1 Dark Up 20.9 134.4 Low 03:45:46 - 05:29:45 2075
Blythe 04:37:26 -21.4 Dark Up 22.2 136.0 Low 03:45:27 - 05:29:26 2105
Calipatria 04:37:44 -21.2 Dark Up 22.0 135.2 Low 03:45:45 - 05:29:44 2044
Yuma 04:37:26 -22.0 Dark Up 22.8 135.7 Low 03:45:27 - 05:29:26 2061

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 2016/03/14 18:00:41 UT

Marc W. Buie, Southwest Research Institute

RECON