RECON: TNO occultation with 69986

Event between (69986) 98WW24 and star UC4-527-017458 with event index number of 95741

Geocentric closest approach at 2017/12/13 04:54:37 UTC

J2000 position of star is 05:51:15.5 +15:21:27
Equinox of date position of star is 05:52:16.0 +15:21:39
Stellar brightness R=15.3, use SENSEUP=128
Star is 118 degrees from the moon. Moon is 22% illuminated.
TNO apparent brightness V=23.3

[RECON map]
TNO is 34.5 AU from the Sun and 33.6 AU from the Earth.
The TNO is moving 25.0 km/sec on the sky relative to the star, or, 3.7 arcsec/hr.
The 1-sigma error in the time of the event is 890 seconds.
The 1-sigma cross-track error in the shadow position is 4332 km.
The sky-plane scale is 24352.6 km/arcsec.

The TNO has an absolute magnitude Hv=7.9
Diameter=158.5 km assuming a 5% albedo -- 6.4 sec chord
Diameter=64.7 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 69986, (2017/12/13 04:55UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:08.6 +07:24:32  0.4  8.01 117
Bellatrix      05:26:05.7 +06:21:52  1.6 11.05 124
137 Tau        05:53:23.5 +14:10:30  5.5  1.22 118
PPM 121447     05:50:59.6 +14:53:04  8.1  0.57 118
PPM 121462     05:51:35.8 +15:30:47  8.9  0.23 118
69986          05:52:17.3 +15:21:40 15.3       118
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 1.0 sigma about the mid-time.
The median site spacing is 18.8 km RECON observability=1.0 and success probability=9.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 04:56:36 -47.1 Dark Down 36.7 110.7 Up 04:41:36 - 05:11:36 2110
Tonasket 04:56:37 -47.2 Dark Down 36.8 110.5 Up 04:41:37 - 05:11:37 2092
Okanogan 04:56:38 -47.2 Dark Down 36.8 110.2 Up 04:41:38 - 05:11:38 2068
Brewster 04:56:39 -47.2 Dark Down 36.8 109.8 Up 04:41:39 - 05:11:39 2050
Manson/Chelan 04:56:40 -47.0 Dark Down 36.7 109.3 Up 04:41:40 - 05:11:40 2040
Entiat 04:56:41 -47.0 Dark Down 36.7 109.1 Up 04:41:41 - 05:11:41 2023
Wenatchee 04:56:42 -47.0 Dark Down 36.7 108.8 Up 04:41:42 - 05:11:42 2005
Ellensburg 04:56:43 -47.0 Dark Down 36.7 108.4 Up 04:41:43 - 05:11:43 1975
Yakima 04:56:45 -47.2 Dark Down 36.8 108.1 Up 04:41:45 - 05:11:45 1942
Toppenish/White Swan 04:56:45 -47.3 Dark Down 37.0 108.1 Up 04:41:45 - 05:11:45 1921
Pasco 04:56:43 -48.2 Dark Down 37.9 109.1 Up 04:41:43 - 05:11:43 1886
Goldendale 04:56:47 -47.2 Dark Down 36.9 107.3 Up 04:41:47 - 05:11:47 1884
The Dalles 04:56:49 -47.0 Dark Down 36.7 106.8 Up 04:41:49 - 05:11:49 1872
George/Umatilla 04:56:44 -48.2 Dark Down 37.8 108.7 Up 04:41:44 - 05:11:44 1863
PNWRO 04:56:43 -48.4 Dark Down 38.1 109.1 Up 04:41:43 - 05:11:43 1862
Maupin 04:56:50 -47.2 Dark Down 36.9 106.6 Up 04:41:50 - 05:11:50 1835
Madras/Culver 04:56:51 -47.3 Dark Down 37.0 106.2 Up 04:41:51 - 05:11:51 1791
Sisters 04:56:53 -47.1 Dark Down 36.8 105.6 Up 04:41:53 - 05:11:53 1772
Redmond 04:56:53 -47.4 Dark Down 37.1 105.9 Up 04:41:53 - 05:11:53 1762
Bend 04:56:54 -47.4 Dark Down 37.1 105.6 Up 04:41:54 - 05:11:54 1746
Oregon Observatory 04:56:54 -47.3 Dark Down 37.0 105.4 Up 04:41:54 - 05:11:54 1734
La Pine/Gilchrist 04:56:55 -47.3 Dark Down 37.0 105.2 Up 04:41:55 - 05:11:55 1718
North Lake 04:56:55 -47.8 Dark Down 37.6 105.4 Up 04:41:55 - 05:11:55 1669
Chiloquin 04:56:58 -47.3 Dark Down 37.1 104.1 Up 04:41:58 - 05:11:58 1630
Paisley 04:56:55 -48.2 Dark Down 38.0 105.3 Up 04:41:55 - 05:11:55 1614
Klamath Falls 04:56:59 -47.4 Dark Down 37.2 103.9 Up 04:41:59 - 05:11:59 1599
Tulelake 04:56:59 -47.7 Dark Down 37.5 104.0 Up 04:41:59 - 05:11:59 1569
Lakeview 04:56:57 -48.5 Dark Down 38.3 105.0 Up 04:41:57 - 05:11:57 1566
Cedarville 04:56:58 -48.8 Dark Down 38.6 104.7 Up 04:41:58 - 05:11:58 1505
Fall River/Burney 04:57:01 -48.0 Dark Down 37.8 103.3 Up 04:42:01 - 05:12:01 1488
Susanville 04:57:02 -48.6 Dark Down 38.5 103.4 Up 04:42:02 - 05:12:02 1416
Greenville 04:57:02 -48.5 Dark Down 38.3 103.0 Up 04:42:02 - 05:12:02 1398
Gimple 04:57:02 -48.5 Dark Down 38.4 103.1 Up 04:42:02 - 05:12:02 1396
Quincy 04:57:03 -48.5 Dark Down 38.4 102.9 Up 04:42:03 - 05:12:03 1380
Portola 04:57:02 -48.9 Dark Down 38.8 103.1 Up 04:42:02 - 05:12:02 1358
Reno 04:57:02 -49.4 Dark Down 39.3 103.4 Up 04:42:02 - 05:12:02 1320
Carson City 04:57:02 -49.5 Dark Down 39.4 103.2 Up 04:42:02 - 05:12:02 1287
Gardnerville 04:57:03 -49.6 Dark Down 39.5 103.0 Up 04:42:03 - 05:12:03 1264
Yerington 04:57:02 -50.0 Dark Down 39.9 103.5 Up 04:42:02 - 05:12:02 1256
Hawthorne 04:57:02 -50.5 Dark Down 40.4 103.5 Up 04:42:02 - 05:12:02 1202
Lee Vining 04:57:04 -50.2 Dark Down 40.2 102.7 Up 04:42:04 - 05:12:04 1161
Tonopah 04:57:00 -51.7 Dark Down 41.6 104.2 Up 04:42:00 - 05:12:00 1129
Bishop 04:57:04 -50.9 Dark Down 40.9 102.7 Up 04:42:04 - 05:12:04 1090
Niwot 04:56:25 -59.9 Dark Down 49.6 117.0 Up 04:41:25 - 05:11:25 1079
Lone Pine 04:57:05 -51.3 Dark Down 41.3 102.3 Up 04:42:05 - 05:12:05 1012
Beatty 04:57:01 -52.3 Dark Down 42.3 103.6 Up 04:42:01 - 05:12:01 1011
Indian Springs 04:56:59 -53.2 Dark Down 43.2 104.1 Up 04:41:59 - 05:11:59 957
CPSLO 04:57:13 -49.4 Dark Down 39.5 99.4 Up 04:42:13 - 05:12:13 948
Henderson 04:56:59 -53.8 Dark Down 43.9 104.2 Up 04:41:59 - 05:11:59 891
Searchlight/Boulder City 04:57:00 -53.9 Dark Down 44.0 103.7 Up 04:42:00 - 05:12:00 835
Patrick 04:56:58 -54.8 Dark Down 44.9 104.4 Up 04:41:58 - 05:11:58 807
Laughlin/Bullhead City 04:57:00 -54.3 Dark Down 44.4 103.7 Up 04:42:00 - 05:12:00 799
Kingman/Dolan Springs 04:56:59 -54.7 Dark Down 44.8 104.1 Up 04:41:59 - 05:11:59 790
Wildwood 04:57:12 -51.2 Dark Down 41.4 99.8 Up 04:42:12 - 05:12:12 786
Mohave Valley 04:57:01 -54.3 Dark Down 44.5 103.4 Up 04:42:01 - 05:12:01 773
DCO 04:56:57 -55.4 Dark Down 45.5 104.7 Up 04:41:57 - 05:11:57 762
Lake Havasu City 04:57:01 -54.6 Dark Down 44.8 103.2 Up 04:42:01 - 05:12:01 729
Idyllwild 04:57:08 -52.7 Dark Down 43.0 100.8 Up 04:42:08 - 05:12:08 709
Parker 04:57:01 -54.7 Dark Down 44.9 102.9 Up 04:42:01 - 05:12:01 694
Blythe 04:57:02 -54.5 Dark Down 44.7 102.2 Up 04:42:02 - 05:12:02 650
Calipatria 04:57:06 -53.8 Dark Down 44.1 101.0 Up 04:42:06 - 05:12:06 623
Yuma 04:57:05 -54.6 Dark Down 44.9 101.3 Up 04:42:05 - 05:12:05 561

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 69986, (2017/12/13 04:55UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  8.01 117
Bellatrix      05:25:07.8 +06:20:58  1.6 11.05 124
137 Tau        05:52:22.3 +14:10:18  5.5  1.22 118
PPM 121447     05:49:58.0 +14:52:49  8.1  0.57 118
PPM 121462     05:50:33.9 +15:30:33  8.9  0.23 118
69986          05:51:15.5 +15:21:27 15.3       118
Positions are for J2000

Event circumstances last updated at 2017/07/29 16:12:16 UT

Marc W. Buie, Southwest Research Institute

RECON