RECON: TNO occultation with 307261

Event between (307261) 02MS4 and star UC4-418-089644 with event index number of 209267

Geocentric closest approach at 2019/08/19 06:30:59 UTC

J2000 position of star is 18:42:43.6 -06:32:33
Equinox of date position of star is 18:43:40.6 -06:31:27
Stellar brightness R=15.9, use SENSEUP=128
Star is 88 degrees from the moon. Moon is 88% illuminated.
TNO apparent brightness V=20.5

[RECON map]
TNO is 46.6 AU from the Sun and 45.9 AU from the Earth.
The TNO is moving 17.5 km/sec on the sky relative to the star, or, 1.9 arcsec/hr.
The 1-sigma error in the time of the event is 448 seconds.
The 1-sigma cross-track error in the shadow position is 5248 km.
The sky-plane scale is 33279.2 km/arcsec.

The TNO has an absolute magnitude Hv=3.7
Diameter=1096.5 km assuming a 5% albedo -- 62.7 sec chord
Diameter=447.7 km assuming a 30% albedo -- 25.6 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 307261, (2019/08/19 06:31UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:36.9 -26:28:26  0.9 37.44 116
60Bet Oph      17:44:26.6 +04:33:38  2.8 18.50 103
PPM 202054     18:43:39.7 -07:03:12  6.5  0.53  87
PPM 202094     18:45:44.2 -06:30:53  6.8  0.49  87
PPM 202047     18:43:24.6 -06:47:07  9.5  0.28  88
307261         18:43:46.9 -06:31:19 15.9        87
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 2.0 sigma about the mid-time.
The median site spacing is 18.8 km RECON observability=1.0 and success probability=4.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 06:27:40 -24.8 Dark Up 30.6 208.2 Up 06:12:40 - 06:42:40 9366
Tonasket 06:27:40 -25.0 Dark Up 30.9 208.2 Up 06:12:40 - 06:42:40 9349
Okanogan 06:27:39 -25.3 Dark Up 31.2 208.2 Up 06:12:39 - 06:42:39 9329
Brewster 06:27:41 -25.5 Dark Up 31.5 208.0 Up 06:12:41 - 06:42:41 9315
Manson/Chelan 06:27:41 -25.6 Dark Up 31.8 207.7 Up 06:12:41 - 06:42:41 9310
Entiat 06:27:40 -25.7 Dark Up 32.0 207.7 Up 06:12:40 - 06:42:40 9296
Wenatchee 06:27:43 -25.9 Dark Up 32.3 207.6 Up 06:12:43 - 06:42:43 9280
Ellensburg 06:27:43 -26.2 Dark Up 32.7 207.5 Up 06:12:43 - 06:42:43 9256
Yakima 06:27:43 -26.6 Dark Up 33.1 207.6 Up 06:12:43 - 06:42:43 9227
Toppenish/White Swan 06:27:41 -26.8 Dark Up 33.2 207.9 Up 06:12:41 - 06:42:41 9205
Goldendale 06:27:45 -27.2 Dark Up 33.8 207.6 Up 06:12:45 - 06:42:45 9177
The Dalles 06:27:45 -27.3 Dark Up 34.1 207.2 Up 06:12:45 - 06:42:45 9171
Pasco 06:27:36 -27.3 Dark Up 32.9 209.3 Up 06:12:36 - 06:42:36 9158
George/Umatilla 06:27:38 -27.6 Dark Up 33.3 209.2 Up 06:12:38 - 06:42:38 9139
Maupin 06:27:45 -27.7 Dark Up 34.5 207.5 Up 06:12:45 - 06:42:45 9136
PNWRO 06:27:37 -27.6 Dark Up 33.0 209.6 Up 06:12:37 - 06:42:37 9133
Madras/Culver 06:27:44 -28.2 Dark Up 35.0 207.6 Up 06:12:44 - 06:42:44 9096
Sisters 06:27:46 -28.3 Dark Up 35.4 207.2 Up 06:12:46 - 06:42:46 9085
Redmond 06:27:45 -28.5 Dark Up 35.3 207.7 Up 06:12:45 - 06:42:45 9070
Bend 06:27:45 -28.6 Dark Up 35.6 207.6 Up 06:12:45 - 06:42:45 9058
Oregon Observatory 06:27:46 -28.7 Dark Up 35.8 207.5 Up 06:12:46 - 06:42:46 9049
La Pine/Gilchrist 06:27:46 -28.9 Dark Up 36.0 207.5 Up 06:12:46 - 06:42:46 9035
North Lake 06:27:45 -29.5 Dark Up 36.1 208.3 Up 06:12:45 - 06:42:45 8982
Chiloquin 06:27:48 -29.7 Dark Up 37.1 207.4 Up 06:12:48 - 06:42:48 8960
Klamath Falls 06:27:48 -30.1 Dark Up 37.3 207.7 Up 06:12:48 - 06:42:48 8930
Paisley 06:27:42 -30.1 Dark Up 36.5 208.9 Up 06:12:42 - 06:42:42 8928
Tulelake 06:27:47 -30.4 Dark Up 37.5 208.1 Up 06:12:47 - 06:42:47 8899
Lakeview 06:27:41 -30.6 Dark Up 36.9 209.3 Up 06:12:41 - 06:42:41 8881
Fall River/Burney 06:27:47 -31.2 Dark Up 38.2 208.5 Up 06:12:47 - 06:42:47 8824
Cedarville 06:27:41 -31.2 Dark Up 37.4 209.8 Up 06:12:41 - 06:42:41 8823
Susanville 06:27:44 -32.0 Dark Up 38.5 209.6 Up 06:12:44 - 06:42:44 8749
Greenville 06:27:44 -32.2 Dark Up 38.9 209.4 Up 06:12:44 - 06:42:44 8736
Gimple 06:27:45 -32.2 Dark Up 38.8 209.5 Up 06:12:45 - 06:42:45 8733
Quincy 06:27:45 -32.4 Dark Up 39.0 209.5 Up 06:12:45 - 06:42:45 8719
Portola 06:27:44 -32.6 Dark Up 39.0 210.1 Up 06:12:44 - 06:42:44 8693
Reno 06:27:40 -33.1 Dark Up 39.0 211.0 Up 06:12:40 - 06:42:40 8649
Carson City 06:27:39 -33.4 Dark Up 39.3 211.1 Up 06:12:39 - 06:42:39 8619
Gardnerville 06:27:40 -33.7 Dark Up 39.4 211.3 Up 06:12:40 - 06:42:40 8597
Yerington 06:27:37 -33.8 Dark Up 39.2 211.9 Up 06:12:37 - 06:42:37 8581
Hawthorne 06:27:35 -34.4 Dark Up 39.3 212.8 Up 06:12:35 - 06:42:35 8525
Lee Vining 06:27:37 -34.8 Dark Up 40.0 212.4 Up 06:12:37 - 06:42:37 8494
Tonopah 06:27:31 -35.3 Dark Up 39.1 214.6 Up 06:12:31 - 06:42:31 8438
Bishop 06:27:34 -35.5 Dark Up 40.2 213.6 Up 06:12:34 - 06:42:34 8418
Lone Pine 06:27:34 -36.3 Dark Up 40.7 214.3 Up 06:12:34 - 06:42:34 8341
Beatty 06:27:29 -36.5 Dark Up 39.9 215.6 Up 06:12:29 - 06:42:29 8322
CPSLO 06:27:46 -36.5 Dark Up 42.9 211.9 Up 06:12:46 - 06:42:46 8319
Indian Springs 06:27:24 -37.2 Dark Up 39.6 217.0 Up 06:12:24 - 06:42:24 8256
Niwot 06:26:44 -36.3 Dark Up 31.6 226.1 Up 06:11:44 - 06:41:44 8227
Henderson 06:27:22 -37.9 Dark Up 39.7 218.0 Up 06:12:22 - 06:42:22 8186
Wildwood 06:27:35 -38.4 Dark Up 43.0 215.0 Up 06:12:35 - 06:42:35 8140
Searchlight/Boulder City 06:27:21 -38.4 Dark Up 40.1 218.4 Up 06:12:21 - 06:42:21 8133
Laughlin/Bullhead City 06:27:19 -38.8 Dark Up 40.2 218.9 Up 06:12:19 - 06:42:19 8094
Patrick 06:27:16 -38.8 Dark Up 39.6 219.6 Up 06:12:16 - 06:42:16 8092
Kingman/Dolan Springs 06:27:19 -39.0 Dark Up 39.9 219.5 Up 06:12:19 - 06:42:19 8078
Mohave Valley 06:27:19 -39.1 Dark Up 40.4 219.1 Up 06:12:19 - 06:42:19 8069
Idyllwild 06:27:28 -39.4 Dark Up 42.4 217.3 Up 06:12:28 - 06:42:28 8041
DCO 06:27:14 -39.3 Dark Up 39.5 220.5 Up 06:12:14 - 06:42:14 8040
Lake Havasu City 06:27:21 -39.5 Dark Up 40.6 219.6 Up 06:12:21 - 06:42:21 8025
Parker 06:27:18 -39.9 Dark Up 40.8 219.8 Up 06:12:18 - 06:42:18 7992
Blythe 06:27:20 -40.2 Dark Up 41.4 219.8 Up 06:12:20 - 06:42:20 7955
Calipatria 06:27:25 -40.4 Dark Up 42.3 219.0 Up 06:12:25 - 06:42:25 7943
Yuma 06:27:20 -41.1 Dark Up 42.1 220.3 Up 06:12:20 - 06:42:20 7872

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 307261, (2019/08/19 06:31UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 37.44 116
60Bet Oph      17:43:28.3 +04:34:05  2.8 18.50 103
PPM 202054     18:42:36.1 -07:04:26  6.5  0.53  87
PPM 202094     18:44:40.9 -06:32:10  6.8  0.49  87
PPM 202047     18:42:21.1 -06:48:20  9.5  0.28  88
307261         18:42:43.6 -06:32:33 15.9        87
Positions are for J2000

Event circumstances last updated at 2017/09/01 17:01:41 UT

Marc W. Buie, Southwest Research Institute

RECON