RECON: TNO occultation with 307261

Event between (307261) 02MS4 and star UC4-418-093843 with event index number of 204030

Geocentric closest approach at 2019/07/16 10:33:59 UTC

J2000 position of star is 18:44:47.8 -06:25:05
Equinox of date position of star is 18:45:44.4 -06:23:55
Stellar brightness R=16.5, use SENSEUP=128
Star is 18 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=20.4

[RECON map]
TNO is 46.6 AU from the Sun and 45.6 AU from the Earth.
The TNO is moving 24.6 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 394 seconds.
The 1-sigma cross-track error in the shadow position is 2608 km.
The sky-plane scale is 33096.4 km/arcsec.

The TNO has an absolute magnitude Hv=3.7
Diameter=1096.5 km assuming a 5% albedo -- 44.6 sec chord
Diameter=447.7 km assuming a 30% albedo -- 18.2 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 307261, (2019/07/16 10:34UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:36.5 -26:28:25  0.9 37.93  39
60Bet Oph      17:44:26.3 +04:33:38  2.8 18.84  36
PPM 202054     18:43:39.4 -07:03:12  6.5  0.85  18
PPM 202094     18:45:43.9 -06:30:53  6.8  0.12  18
PPM 202101     18:45:52.6 -06:19:09  9.1  0.08  18
307261         18:45:50.7 -06:23:48 16.5        18
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 2.3 sigma about the mid-time.
The median site spacing is 22.0 km RECON observability=0.8 and success probability=13.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 10:31:21 -12.4 AT Up 19.0 235.0 Really Low 10:16:21 - 10:46:21 195
Tonasket 10:31:21 -12.6 AT Up 19.1 235.0 Really Low 10:16:21 - 10:46:21 177
Okanogan 10:31:20 -12.9 AT Up 19.4 235.0 Really Low 10:16:20 - 10:46:20 154
Brewster 10:31:20 -13.2 AT Up 19.6 234.9 Really Low 10:16:20 - 10:46:20 136
Manson/Chelan 10:31:20 -13.5 AT Up 20.0 234.6 Really Low 10:16:20 - 10:46:20 125
Entiat 10:31:20 -13.7 AT Up 20.1 234.6 Low 10:16:20 - 10:46:20 109
Wenatchee 10:31:20 -14.0 AT Up 20.3 234.6 Low 10:16:20 - 10:46:20 91
Ellensburg 10:31:19 -14.4 AT Up 20.7 234.5 Low 10:16:19 - 10:46:19 62
Yakima 10:31:18 -14.8 AT Up 20.9 234.6 Low 10:16:18 - 10:46:18 35
Toppenish/White Swan 10:31:17 -14.9 AT Up 21.0 234.9 Low 10:16:17 - 10:46:17 13
Pasco 10:31:15 -14.5 AT Up 20.3 236.0 Low 10:16:15 - 10:46:15 -23
Goldendale 10:31:17 -15.5 AT Up 21.5 234.7 Low 10:16:17 - 10:46:17 -26
George/Umatilla 10:31:14 -14.8 AT Up 20.6 235.9 Low 10:16:14 - 10:46:14 -38
The Dalles 10:31:17 -15.8 AT Up 21.9 234.4 Low 10:16:17 - 10:46:17 -40
PNWRO 10:31:14 -14.6 AT Up 20.3 236.3 Low 10:16:14 - 10:46:14 -42
Maupin 10:31:16 -16.1 AT Up 22.1 234.6 Low 10:16:16 - 10:46:16 -74
Madras/Culver 10:31:15 -16.6 AT Up 22.4 234.8 Low 10:16:15 - 10:46:15 -117
Sisters 10:31:16 -17.1 AT Up 22.9 234.5 Low 10:16:16 - 10:46:16 -138
Redmond 10:31:15 -16.9 AT Up 22.6 234.9 Low 10:16:15 - 10:46:15 -146
Bend 10:31:14 -17.2 AT Up 22.8 234.8 Low 10:16:14 - 10:46:14 -160
Oregon Observatory 10:31:14 -17.3 AT Up 23.0 234.7 Low 10:16:14 - 10:46:14 -172
La Pine/Gilchrist 10:31:14 -17.5 AT Up 23.2 234.8 Low 10:16:14 - 10:46:14 -188
North Lake 10:31:12 -17.7 AT Up 23.1 235.4 Low 10:16:12 - 10:46:12 -232
Chiloquin 10:31:13 -18.6 Dark Up 24.0 234.9 Low 10:16:13 - 10:46:13 -274
Paisley 10:31:10 -18.0 AT Up 23.2 235.9 Low 10:16:10 - 10:46:10 -281
Klamath Falls 10:31:12 -18.9 Dark Up 24.2 235.0 Low 10:16:12 - 10:46:12 -304
Lakeview 10:31:09 -18.3 Dark Up 23.3 236.3 Low 10:16:09 - 10:46:09 -326
Tulelake 10:31:11 -19.0 Dark Up 24.2 235.4 Low 10:16:11 - 10:46:11 -330
Cedarville 10:31:07 -18.8 Dark Up 23.6 236.7 Low 10:16:07 - 10:46:07 -384
Fall River/Burney 10:31:09 -19.7 Dark Up 24.6 235.8 Low 10:16:09 - 10:46:09 -407
Susanville 10:31:06 -19.9 Dark Up 24.5 236.7 Low 10:16:06 - 10:46:06 -471
Greenville 10:31:07 -20.2 Dark Up 24.8 236.5 Low 10:16:07 - 10:46:07 -491
Gimple 10:31:06 -20.2 Dark Up 24.8 236.6 Low 10:16:06 - 10:46:06 -492
Quincy 10:31:06 -20.4 Dark Up 25.0 236.6 Low 10:16:06 - 10:46:06 -508
Portola 10:31:05 -20.3 Dark Up 24.7 237.0 Low 10:16:05 - 10:46:05 -526
Reno 10:31:03 -20.2 Dark Up 24.5 237.7 Low 10:16:03 - 10:46:03 -558
Carson City 10:31:02 -20.5 Dark Up 24.6 237.8 Low 10:16:02 - 10:46:02 -589
Gardnerville 10:31:02 -20.7 Dark Up 24.7 238.0 Low 10:16:02 - 10:46:02 -611
Yerington 10:31:00 -20.4 Dark Up 24.3 238.4 Low 10:16:00 - 10:46:00 -616
Hawthorne 10:30:59 -20.5 Dark Up 24.2 239.0 Low 10:15:59 - 10:45:59 -664
Lee Vining 10:30:59 -21.2 Dark Up 24.8 238.8 Low 10:15:59 - 10:45:59 -706
Niwot 10:30:38 -12.3 AT Up 14.2 248.6 Really Low 10:15:38 - 10:45:38 -711
Tonopah 10:30:55 -20.2 Dark Up 23.5 240.3 Low 10:15:55 - 10:45:55 -726
Bishop 10:30:56 -21.3 Dark Up 24.7 239.7 Low 10:15:56 - 10:45:56 -770
Beatty 10:30:52 -20.9 Dark Up 23.8 241.1 Low 10:15:52 - 10:45:52 -836
Lone Pine 10:30:54 -21.8 Dark Up 24.8 240.2 Low 10:15:54 - 10:45:54 -844
Indian Springs 10:30:49 -20.6 Dark Up 23.2 242.0 Low 10:15:49 - 10:45:49 -882
CPSLO 10:30:58 -24.1 Dark Up 27.3 238.7 Low 10:15:58 - 10:45:58 -923
Henderson 10:30:46 -20.6 Dark Up 22.9 242.8 Low 10:15:46 - 10:45:46 -941
Searchlight/Boulder City 10:30:45 -21.0 Dark Up 23.1 243.0 Low 10:15:45 - 10:45:45 -994
Patrick 10:30:43 -20.5 Dark Up 22.4 243.8 Low 10:15:43 - 10:45:43 -1015
Laughlin/Bullhead City 10:30:44 -21.1 Dark Up 23.0 243.4 Low 10:15:44 - 10:45:44 -1027
Kingman/Dolan Springs 10:30:43 -20.8 Dark Up 22.6 243.8 Low 10:15:43 - 10:45:43 -1032
Mohave Valley 10:30:44 -21.3 Dark Up 23.1 243.5 Low 10:15:44 - 10:45:44 -1052
DCO 10:30:41 -20.3 Dark Up 22.0 244.4 Low 10:15:41 - 10:45:41 -1053
Wildwood 10:30:51 -24.0 Dark Up 26.4 240.8 Low 10:15:51 - 10:45:51 -1065
Lake Havasu City 10:30:42 -21.4 Dark Up 23.1 243.8 Low 10:15:42 - 10:45:42 -1093
Parker 10:30:42 -21.7 Dark Up 23.3 244.0 Low 10:15:42 - 10:45:42 -1126
Idyllwild 10:30:46 -23.3 Dark Up 25.2 242.4 Low 10:15:46 - 10:45:46 -1127
Blythe 10:30:41 -22.2 Dark Up 23.7 244.0 Low 10:15:41 - 10:45:41 -1171
Calipatria 10:30:43 -23.1 Dark Up 24.6 243.5 Low 10:15:43 - 10:45:43 -1203
Yuma 10:30:40 -22.9 Dark Up 24.2 244.3 Low 10:15:40 - 10:45:40 -1258

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, (2019/07/16 10:34UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 37.93  39
60Bet Oph      17:43:28.3 +04:34:05  2.8 18.84  36
PPM 202054     18:42:36.1 -07:04:26  6.5  0.85  18
PPM 202094     18:44:40.9 -06:32:10  6.8  0.12  18
PPM 202101     18:44:49.7 -06:20:26  9.1  0.08  18
307261         18:44:47.8 -06:25:05 16.5        18
Positions are for J2000

Event circumstances last updated at 2017/08/04 18:11:16 UT

Marc W. Buie, Southwest Research Institute

RECON