RECON: TNO occultation with 310071

Event between (310071) 10KR59 and star UC4-383-067675 with event index number of 114554

Geocentric closest approach at 2018/04/26 11:20:40 UTC

J2000 position of star is 14:40:20.4 -13:29:50
Equinox of date position of star is 14:41:17.7 -13:34:17
Stellar brightness R=17.0, use SENSEUP=128
Star is 50 degrees from the moon. Moon is 86% illuminated.
TNO apparent brightness V=19.9

[RECON map]
TNO is 16.5 AU from the Sun and 15.5 AU from the Earth.
The TNO is moving 21.9 km/sec on the sky relative to the star, or, 7.0 arcsec/hr.
The 1-sigma error in the time of the event is 51 seconds.
The 1-sigma cross-track error in the shadow position is 960 km.
The sky-plane scale is 11273.9 km/arcsec.

The TNO has an absolute magnitude Hv=7.8
Diameter=166.0 km assuming a 5% albedo -- 7.6 sec chord
Diameter=67.8 km assuming a 30% albedo -- 3.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 310071, (2018/04/26 11:21UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:09.6 -11:15:23  1.0 18.50  32
27Bet Lib      15:17:59.7 -09:26:58  2.6  9.88  57
PPM 229046     14:37:58.5 -12:22:57  6.2  1.45  49
PPM 229140     14:42:19.1 -14:00:22  8.5  0.49  50
PPM 229092     14:40:17.3 -13:45:49  9.5  0.32  50
310071         14:41:20.5 -13:34:30 17.0        50
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 15.0 km RECON observability=0.7 and success probability=6.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 11:19:12 -13.0 AT Up 16.1 225.4 Really Low 11:14:27 - 11:23:58 2722
Tonasket 11:19:11 -13.2 AT Up 16.3 225.4 Really Low 11:14:26 - 11:23:57 2711
Okanogan 11:19:10 -13.5 AT Up 16.6 225.4 Really Low 11:14:25 - 11:23:56 2696
Brewster 11:19:10 -13.8 AT Up 16.9 225.3 Really Low 11:14:25 - 11:23:56 2684
Manson/Chelan 11:19:10 -14.1 AT Up 17.2 225.0 Really Low 11:14:25 - 11:23:56 2675
Entiat 11:19:10 -14.3 AT Up 17.4 225.0 Really Low 11:14:24 - 11:23:55 2665
Wenatchee 11:19:10 -14.5 AT Up 17.6 224.9 Really Low 11:14:24 - 11:23:55 2653
Ellensburg 11:19:09 -14.9 AT Up 18.0 224.8 Really Low 11:14:24 - 11:23:55 2634
Yakima 11:19:08 -15.1 AT Up 18.3 224.9 Really Low 11:14:22 - 11:23:53 2614
Toppenish/White Swan 11:19:06 -15.2 AT Up 18.4 225.1 Really Low 11:14:21 - 11:23:52 2603
Pasco 11:19:04 -14.6 AT Up 17.9 226.2 Really Low 11:14:18 - 11:23:49 2594
PNWRO 11:19:02 -14.6 AT Up 17.9 226.5 Really Low 11:14:17 - 11:23:48 2582
George/Umatilla 11:19:03 -14.9 AT Up 18.2 226.1 Really Low 11:14:18 - 11:23:49 2578
Goldendale 11:19:06 -15.8 AT Up 19.0 224.8 Really Low 11:14:21 - 11:23:52 2576
The Dalles 11:19:06 -16.1 AT Up 19.4 224.6 Really Low 11:14:21 - 11:23:52 2565
Maupin 11:19:05 -16.3 AT Up 19.6 224.8 Really Low 11:14:20 - 11:23:51 2544
Madras/Culver 11:19:04 -16.7 AT Up 20.0 224.9 Low 11:14:18 - 11:23:49 2516
Sisters 11:19:04 -17.1 AT Up 20.5 224.5 Low 11:14:18 - 11:23:49 2499
Redmond 11:19:03 -16.9 AT Up 20.3 224.9 Low 11:14:17 - 11:23:48 2497
Bend 11:19:03 -17.2 AT Up 20.5 224.8 Low 11:14:17 - 11:23:48 2486
Oregon Observatory 11:19:03 -17.3 AT Up 20.7 224.8 Low 11:14:17 - 11:23:48 2478
La Pine/Gilchrist 11:19:02 -17.5 AT Up 20.9 224.8 Low 11:14:17 - 11:23:48 2467
North Lake 11:18:59 -17.5 AT Up 20.9 225.4 Low 11:14:14 - 11:23:45 2442
Paisley 11:18:57 -17.6 AT Up 21.1 225.9 Low 11:14:11 - 11:23:42 2411
Chiloquin 11:19:00 -18.4 Dark Up 21.9 224.8 Low 11:14:14 - 11:23:45 2406
Klamath Falls 11:18:59 -18.6 Dark Up 22.1 224.9 Low 11:14:14 - 11:23:45 2387
Lakeview 11:18:55 -17.8 AT Up 21.4 226.2 Low 11:14:09 - 11:23:40 2382
Tulelake 11:18:57 -18.6 Dark Up 22.1 225.3 Low 11:14:12 - 11:23:43 2371
Cedarville 11:18:52 -18.1 Dark Up 21.7 226.5 Low 11:14:07 - 11:23:38 2344
Fall River/Burney 11:18:55 -19.1 Dark Up 22.7 225.6 Low 11:14:09 - 11:23:40 2318
Susanville 11:18:51 -19.1 Dark Up 22.8 226.4 Low 11:14:05 - 11:23:36 2280
Greenville 11:18:51 -19.5 Dark Up 23.1 226.2 Low 11:14:05 - 11:23:36 2264
Gimple 11:18:51 -19.4 Dark Up 23.1 226.3 Low 11:14:05 - 11:23:36 2264
Quincy 11:18:50 -19.6 Dark Up 23.2 226.3 Low 11:14:05 - 11:23:36 2252
Portola 11:18:48 -19.4 Dark Up 23.1 226.7 Low 11:14:03 - 11:23:34 2244
Reno 11:18:46 -19.2 Dark Up 22.9 227.4 Low 11:14:00 - 11:23:31 2226
Carson City 11:18:45 -19.4 Dark Up 23.1 227.5 Low 11:13:59 - 11:23:30 2204
Yerington 11:18:42 -19.1 Dark Up 22.9 228.1 Low 11:13:57 - 11:23:28 2191
Gardnerville 11:18:44 -19.5 Dark Up 23.3 227.6 Low 11:13:58 - 11:23:29 2189
Niwot 11:18:11 -9.4 CT Down 13.6 238.8 Really Low 11:13:26 - 11:22:57 2183
Hawthorne 11:18:39 -19.0 Dark Up 22.9 228.7 Low 11:13:54 - 11:23:25 2160
Tonopah 11:18:34 -18.4 Dark Up 22.4 230.0 Low 11:13:48 - 11:23:19 2127
Lee Vining 11:18:39 -19.7 Dark Up 23.6 228.5 Low 11:13:54 - 11:23:25 2127
Bishop 11:18:35 -19.6 Dark Up 23.5 229.2 Low 11:13:50 - 11:23:21 2086
Beatty 11:18:30 -18.8 Dark Up 22.8 230.7 Low 11:13:44 - 11:23:15 2050
Lone Pine 11:18:32 -19.8 Dark Up 23.8 229.8 Low 11:13:47 - 11:23:18 2035
Indian Springs 11:18:25 -18.3 Dark Up 22.4 231.7 Low 11:13:40 - 11:23:11 2025
Henderson 11:18:22 -18.1 Dark Down 22.3 232.4 Low 11:13:37 - 11:23:08 1986
CPSLO 11:18:37 -22.3 Dark Up 26.3 228.1 Low 11:13:51 - 11:23:22 1955
Searchlight/Boulder City 11:18:20 -18.4 Dark Down 22.6 232.6 Low 11:13:35 - 11:23:06 1948
Patrick 11:18:17 -17.7 AT Down 21.9 233.5 Low 11:13:31 - 11:23:02 1939
Laughlin/Bullhead City 11:18:18 -18.3 Dark Down 22.6 233.0 Low 11:13:33 - 11:23:04 1925
Kingman/Dolan Springs 11:18:17 -17.9 AT Down 22.2 233.4 Low 11:13:31 - 11:23:02 1925
DCO 11:18:15 -17.4 AT Down 21.7 234.1 Low 11:13:29 - 11:23:00 1915
Mohave Valley 11:18:18 -18.5 Dark Down 22.7 233.1 Low 11:13:32 - 11:23:03 1907
Lake Havasu City 11:18:16 -18.5 Dark Down 22.8 233.4 Low 11:13:30 - 11:23:01 1878
Wildwood 11:18:27 -21.6 Dark Up 25.8 230.2 Low 11:13:41 - 11:23:12 1868
Parker 11:18:15 -18.7 Dark Down 23.0 233.6 Low 11:13:30 - 11:23:01 1854
Idyllwild 11:18:20 -20.6 Dark Up 24.8 231.8 Low 11:13:35 - 11:23:06 1837
Blythe 11:18:14 -19.2 Dark Down 23.5 233.5 Low 11:13:29 - 11:23:00 1818
Calipatria 11:18:16 -20.1 Dark Down 24.4 233.0 Low 11:13:30 - 11:23:01 1788
Yuma 11:18:12 -19.7 Dark Down 24.1 233.8 Low 11:13:27 - 11:22:58 1753

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 310071, (2018/04/26 11:21UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 18.50  32
27Bet Lib      15:17:00.3 -09:22:59  2.6  9.88  57
PPM 229046     14:36:58.7 -12:18:13  6.2  1.45  49
PPM 229140     14:41:18.9 -13:55:43  8.5  0.49  50
PPM 229092     14:39:17.2 -13:41:07  9.5  0.32  50
310071         14:40:20.4 -13:29:50 17.0        50
Positions are for J2000

Event circumstances last updated at 2017/06/14 17:00:51 UT

Marc W. Buie, Southwest Research Institute

RECON