RECON: TNO occultation with 69986

Event between (69986) 98WW24 and star UC4-527-017314 with event index number of 95743

Geocentric closest approach at 2017/12/18 09:32:12 UTC

J2000 position of star is 05:50:43.7 +15:20:55
Equinox of date position of star is 05:51:44.2 +15:21:08
Stellar brightness R=14.8, use SENSEUP=128
Star is 176 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=23.2

[RECON map]
TNO is 34.5 AU from the Sun and 33.6 AU from the Earth.
The TNO is moving 25.1 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 884 seconds.
The 1-sigma cross-track error in the shadow position is 4292 km.
The sky-plane scale is 24350.6 km/arcsec.

The TNO has an absolute magnitude Hv=7.9
Diameter=158.5 km assuming a 5% albedo -- 6.3 sec chord
Diameter=64.7 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 69986, (2017/12/18 09:32UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:08.7 +07:24:32  0.4  8.02 168
Bellatrix      05:26:05.7 +06:21:52  1.6 10.97 165
131 Tau        05:48:14.6 +14:29:37  5.7  1.21 175
PPM 121447     05:50:59.6 +14:53:04  8.1  0.50 175
PPM 121462     05:51:35.8 +15:30:47  8.9  0.17 176
69986          05:51:45.5 +15:21:09 14.8       176
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 24.3 km RECON observability=1.0 and success probability=10.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 09:30:59 -58.2 Dark Down 51.6 217.0 Up 09:15:59 - 09:45:59 -321
Tonasket 09:30:58 -58.3 Dark Down 51.8 217.2 Up 09:15:58 - 09:45:58 -343
Okanogan 09:30:58 -58.6 Dark Down 52.1 217.2 Up 09:15:58 - 09:45:58 -375
Brewster 09:30:59 -58.9 Dark Down 52.4 217.1 Up 09:15:59 - 09:45:59 -401
Manson/Chelan 09:31:00 -59.2 Dark Down 52.7 216.8 Up 09:16:00 - 09:46:00 -422
Entiat 09:31:00 -59.4 Dark Down 52.9 216.9 Up 09:16:00 - 09:46:00 -443
Wenatchee 09:31:00 -59.6 Dark Down 53.2 216.9 Up 09:16:00 - 09:46:00 -467
Ellensburg 09:31:00 -60.0 Dark Down 53.6 216.9 Up 09:16:00 - 09:46:00 -507
Yakima 09:30:59 -60.3 Dark Down 53.9 217.2 Up 09:15:59 - 09:45:59 -545
Toppenish/White Swan 09:30:59 -60.4 Dark Down 54.0 217.7 Up 09:15:59 - 09:45:59 -566
Pasco 09:30:55 -59.8 Dark Down 53.6 219.6 Up 09:15:55 - 09:45:55 -573
PNWRO 09:30:54 -59.9 Dark Down 53.7 220.1 Up 09:15:54 - 09:45:54 -595
George/Umatilla 09:30:55 -60.2 Dark Down 53.9 219.6 Up 09:15:55 - 09:45:55 -606
Goldendale 09:30:59 -61.0 Dark Down 54.6 217.5 Up 09:15:59 - 09:45:59 -620
The Dalles 09:31:00 -61.3 Dark Down 55.0 217.1 Up 09:16:00 - 09:46:00 -643
Maupin 09:31:00 -61.6 Dark Down 55.2 217.7 Up 09:16:00 - 09:46:00 -682
Madras/Culver 09:30:59 -61.9 Dark Down 55.7 218.1 Up 09:15:59 - 09:45:59 -735
Sisters 09:31:00 -62.4 Dark Down 56.2 217.7 Up 09:16:00 - 09:46:00 -769
Redmond 09:30:59 -62.2 Dark Down 56.0 218.3 Up 09:15:59 - 09:45:59 -770
Bend 09:30:59 -62.4 Dark Down 56.2 218.3 Up 09:15:59 - 09:45:59 -791
Oregon Observatory 09:31:00 -62.6 Dark Down 56.4 218.3 Up 09:16:00 - 09:46:00 -809
La Pine/Gilchrist 09:31:00 -62.8 Dark Down 56.6 218.4 Up 09:16:00 - 09:46:00 -829
North Lake 09:30:58 -62.7 Dark Down 56.7 219.7 Up 09:15:58 - 09:45:58 -870
Paisley 09:30:56 -62.9 Dark Down 56.9 220.8 Up 09:15:56 - 09:45:56 -923
Chiloquin 09:31:00 -63.7 Dark Down 57.6 218.9 Up 09:16:00 - 09:46:00 -940
Lakeview 09:30:55 -63.1 Dark Down 57.2 221.6 Up 09:15:55 - 09:45:55 -972
Klamath Falls 09:30:59 -63.9 Dark Down 57.9 219.4 Up 09:15:59 - 09:45:59 -973
Tulelake 09:30:58 -63.9 Dark Down 57.9 220.1 Up 09:15:58 - 09:45:58 -999
Cedarville 09:30:54 -63.4 Dark Down 57.6 222.6 Up 09:15:54 - 09:45:54 -1037
Niwot 09:30:09 -53.8 Dark Down 49.5 243.0 Up 09:15:09 - 09:45:09 -1081
Fall River/Burney 09:30:57 -64.4 Dark Down 58.6 221.2 Up 09:15:57 - 09:45:57 -1090
Susanville 09:30:54 -64.3 Dark Down 58.7 223.0 Up 09:15:54 - 09:45:54 -1151
Gimple 09:30:54 -64.6 Dark Down 59.0 223.0 Up 09:15:54 - 09:45:54 -1179
Greenville 09:30:55 -64.6 Dark Down 59.0 222.9 Up 09:15:55 - 09:45:55 -1179
Quincy 09:30:55 -64.7 Dark Down 59.2 223.1 Up 09:15:55 - 09:45:55 -1200
Portola 09:30:53 -64.5 Dark Down 59.0 224.0 Up 09:15:53 - 09:45:53 -1211
Reno 09:30:51 -64.2 Dark Down 58.9 225.3 Up 09:15:51 - 09:45:51 -1235
Carson City 09:30:50 -64.4 Dark Down 59.1 225.8 Up 09:15:50 - 09:45:50 -1272
Yerington 09:30:48 -64.1 Dark Down 58.9 227.0 Up 09:15:48 - 09:45:48 -1289
Gardnerville 09:30:50 -64.5 Dark Down 59.3 226.1 Up 09:15:50 - 09:45:50 -1296
Hawthorne 09:30:46 -64.0 Dark Down 58.9 228.3 Up 09:15:46 - 09:45:46 -1334
Tonopah 09:30:41 -63.2 Dark Down 58.4 230.9 Up 09:15:41 - 09:45:41 -1375
Lee Vining 09:30:47 -64.6 Dark Down 59.6 228.3 Up 09:15:47 - 09:45:47 -1394
Bishop 09:30:44 -64.3 Dark Down 59.5 230.1 Up 09:15:44 - 09:45:44 -1452
Beatty 09:30:39 -63.4 Dark Down 58.8 233.0 Up 09:15:39 - 09:45:39 -1492
Indian Springs 09:30:35 -62.7 Dark Down 58.3 234.9 Up 09:15:35 - 09:45:35 -1519
Lone Pine 09:30:43 -64.4 Dark Down 59.8 231.6 Up 09:15:43 - 09:45:43 -1529
Henderson 09:30:32 -62.4 Dark Down 58.2 236.6 Up 09:15:32 - 09:45:32 -1571
Patrick 09:30:28 -61.7 Dark Down 57.7 238.8 Up 09:15:28 - 09:45:28 -1629
Searchlight/Boulder City 09:30:32 -62.5 Dark Down 58.4 237.4 Up 09:15:32 - 09:45:32 -1630
Kingman/Dolan Springs 09:30:29 -61.9 Dark Down 58.0 238.9 Up 09:15:29 - 09:45:29 -1653
DCO 09:30:25 -61.2 Dark Down 57.4 240.1 Up 09:15:25 - 09:45:25 -1656
Laughlin/Bullhead City 09:30:30 -62.3 Dark Down 58.4 238.3 Up 09:15:30 - 09:45:30 -1659
CPSLO 09:30:50 -66.9 Dark Down 62.2 229.5 Up 09:15:50 - 09:45:50 -1675
Mohave Valley 09:30:30 -62.4 Dark Down 58.5 238.6 Up 09:15:30 - 09:45:30 -1687
Lake Havasu City 09:30:29 -62.3 Dark Down 58.5 239.5 Up 09:15:29 - 09:45:29 -1728
Parker 09:30:28 -62.4 Dark Down 58.7 240.0 Up 09:15:28 - 09:45:28 -1764
Wildwood 09:30:43 -65.8 Dark Down 61.7 234.4 Up 09:15:43 - 09:45:43 -1793
Idyllwild 09:30:36 -64.4 Dark Down 60.6 237.6 Up 09:15:36 - 09:45:36 -1821
Blythe 09:30:29 -62.8 Dark Down 59.2 240.4 Up 09:15:29 - 09:45:29 -1821
Calipatria 09:30:32 -63.6 Dark Down 60.1 240.0 Up 09:15:32 - 09:45:32 -1879
Yuma 09:30:28 -63.0 Dark Down 59.6 241.7 Up 09:15:28 - 09:45:28 -1919

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, (2017/12/18 09:32UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  8.02 168
Bellatrix      05:25:07.8 +06:20:58  1.6 10.97 165
131 Tau        05:47:13.1 +14:29:18  5.7  1.21 175
PPM 121447     05:49:58.0 +14:52:49  8.1  0.50 175
PPM 121462     05:50:33.9 +15:30:33  8.9  0.17 176
69986          05:50:43.7 +15:20:55 14.8       176
Positions are for J2000

Event circumstances last updated at 2017/07/29 16:12:34 UT

Marc W. Buie, Southwest Research Institute

RECON