RECON: TNO occultation with 307261

Event between (307261) 02MS4 and star UC4-418-095031 with event index number of 204017

Geocentric closest approach at 2019/07/09 04:21:26 UTC

J2000 position of star is 18:45:19.2 -06:24:13
Equinox of date position of star is 18:46:17.0 -06:23:02
Stellar brightness R=15.8, use SENSEUP=128
Star is 87 degrees from the moon. Moon is 47% illuminated.
TNO apparent brightness V=20.3

[RECON map]
TNO is 46.6 AU from the Sun and 45.6 AU from the Earth.
The TNO is moving 25.1 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 166 seconds.
The 1-sigma cross-track error in the shadow position is 1889 km.
The sky-plane scale is 33084.8 km/arcsec.

The TNO has an absolute magnitude Hv=3.6
Diameter=1148.2 km assuming a 5% albedo -- 45.7 sec chord
Diameter=468.7 km assuming a 30% albedo -- 18.7 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 307261, (2019/07/09 04:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:36.4 -26:28:25  0.9 38.04  57
60Bet Oph      17:44:26.3 +04:33:38  2.8 18.94  72
PPM 202138     18:48:31.5 -05:40:58  4.6  0.88  88
PPM 202094     18:45:43.8 -06:30:53  6.8  0.21  87
PPM 202118     18:46:48.2 -06:26:00  8.6  0.12  87
307261         18:46:22.1 -06:22:56 15.8        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 5.0 sigma about the mid-time.
The median site spacing is 28.8 km RECON observability=0.2 and success probability=1.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 04:23:12 -3.5 CT Up 20.6 127.8 Low 04:08:54 - 04:37:30 -4049
Tonasket 04:23:12 -3.7 CT Up 20.7 127.7 Low 04:08:54 - 04:37:30 -4063
Okanogan 04:23:14 -3.8 CT Up 20.9 127.5 Low 04:08:56 - 04:37:32 -4084
Brewster 04:23:15 -3.9 CT Up 20.9 127.2 Low 04:08:57 - 04:37:33 -4101
Manson/Chelan 04:23:16 -3.9 CT Up 20.8 126.8 Low 04:08:58 - 04:37:34 -4114
Entiat 04:23:17 -4.0 CT Up 20.9 126.7 Low 04:08:59 - 04:37:35 -4128
Wenatchee 04:23:18 -4.1 CT Up 21.0 126.5 Low 04:09:00 - 04:37:36 -4144
Ellensburg 04:23:19 -4.2 CT Up 21.2 126.2 Low 04:09:01 - 04:37:37 -4171
Yakima 04:23:21 -4.5 CT Up 21.4 126.1 Low 04:09:03 - 04:37:39 -4197
Toppenish/White Swan 04:23:21 -4.7 CT Up 21.6 126.1 Low 04:09:03 - 04:37:39 -4211
Pasco 04:23:19 -5.5 CT Up 22.4 127.2 Low 04:09:01 - 04:37:37 -4216
PNWRO 04:23:19 -5.8 CT Up 22.7 127.4 Low 04:09:01 - 04:37:37 -4232
George/Umatilla 04:23:20 -5.6 CT Up 22.5 126.9 Low 04:09:02 - 04:37:38 -4238
Goldendale 04:23:23 -4.9 CT Up 21.7 125.6 Low 04:09:05 - 04:37:41 -4247
The Dalles 04:23:25 -4.8 CT Up 21.6 125.2 Low 04:09:07 - 04:37:43 -4263
Maupin 04:23:26 -5.1 CT Up 21.9 125.2 Low 04:09:08 - 04:37:44 -4290
Madras/Culver 04:23:27 -5.5 CT Up 22.2 125.0 Low 04:09:09 - 04:37:45 -4327
Sisters 04:23:29 -5.4 CT Up 22.2 124.5 Low 04:09:11 - 04:37:47 -4351
Redmond 04:23:28 -5.7 CT Up 22.4 124.8 Low 04:09:10 - 04:37:46 -4351
Bend 04:23:29 -5.7 CT Up 22.5 124.6 Low 04:09:11 - 04:37:47 -4366
Oregon Observatory 04:23:30 -5.8 CT Up 22.5 124.4 Low 04:09:12 - 04:37:48 -4378
La Pine/Gilchrist 04:23:30 -5.8 CT Up 22.6 124.3 Low 04:09:12 - 04:37:48 -4392
North Lake 04:23:30 -6.5 CT Up 23.2 124.7 Low 04:09:12 - 04:37:48 -4421
Paisley 04:23:31 -7.0 CT Up 23.7 124.8 Low 04:09:13 - 04:37:49 -4459
Chiloquin 04:23:33 -6.3 CT Up 23.0 123.6 Low 04:09:15 - 04:37:51 -4471
Lakeview 04:23:32 -7.5 CT Up 24.1 124.8 Low 04:09:14 - 04:37:50 -4494
Klamath Falls 04:23:35 -6.6 CT Up 23.2 123.6 Low 04:09:17 - 04:37:53 -4495
Tulelake 04:23:34 -7.0 CT Up 23.6 123.7 Low 04:09:16 - 04:37:52 -4513
Cedarville 04:23:33 -8.0 CT Up 24.6 124.7 Low 04:09:15 - 04:37:51 -4541
Fall River/Burney 04:23:37 -7.6 CT Up 24.1 123.5 Low 04:09:19 - 04:37:55 -4578
Susanville 04:23:36 -8.4 CT Up 24.9 123.9 Low 04:09:18 - 04:37:54 -4623
Niwot 04:22:58 -16.9 AT Up 34.0 138.0 Up 04:08:40 - 04:37:16 -4637
Gimple 04:23:38 -8.5 CT Up 25.0 123.6 Low 04:09:20 - 04:37:56 -4644
Greenville 04:23:38 -8.4 CT Up 24.9 123.5 Low 04:09:20 - 04:37:56 -4644
Quincy 04:23:39 -8.5 CT Up 25.0 123.5 Low 04:09:21 - 04:37:57 -4659
Portola 04:23:38 -8.9 CT Up 25.4 123.8 Low 04:09:20 - 04:37:56 -4667
Reno 04:23:37 -9.5 CT Up 26.0 124.2 Low 04:09:19 - 04:37:55 -4686
Carson City 04:23:37 -9.7 CT Up 26.2 124.1 Low 04:09:19 - 04:37:55 -4713
Yerington 04:23:37 -10.2 CT Up 26.7 124.6 Low 04:09:19 - 04:37:55 -4726
Gardnerville 04:23:38 -9.9 CT Up 26.3 124.1 Low 04:09:20 - 04:37:56 -4731
Hawthorne 04:23:36 -10.8 CT Up 27.3 124.8 Low 04:09:18 - 04:37:54 -4760
Tonopah 04:23:34 -12.0 CT Up 28.5 125.8 Low 04:09:16 - 04:37:52 -4794
Lee Vining 04:23:39 -10.9 CT Up 27.3 124.2 Low 04:09:21 - 04:37:57 -4804
Bishop 04:23:38 -11.7 CT Up 28.1 124.5 Low 04:09:20 - 04:37:56 -4849
Beatty 04:23:36 -13.0 AT Up 29.4 125.7 Low 04:09:18 - 04:37:54 -4883
Indian Springs 04:23:33 -13.9 AT Up 30.3 126.5 Up 04:09:15 - 04:37:51 -4907
Lone Pine 04:23:39 -12.4 AT Up 28.8 124.5 Low 04:09:21 - 04:37:57 -4908
Henderson 04:23:33 -14.6 AT Up 31.1 126.9 Up 04:09:15 - 04:37:51 -4949
Searchlight/Boulder City 04:23:33 -15.1 AT Up 31.5 126.6 Up 04:09:15 - 04:37:51 -4995
Patrick 04:23:31 -15.7 AT Up 32.2 127.5 Up 04:09:13 - 04:37:49 -4998
Kingman/Dolan Springs 04:23:32 -15.8 AT Up 32.2 127.3 Up 04:09:14 - 04:37:50 -5016
CPSLO 04:23:48 -11.6 CT Up 27.7 121.8 Low 04:09:30 - 04:38:06 -5017
Laughlin/Bullhead City 04:23:34 -15.5 AT Up 31.9 126.8 Up 04:09:16 - 04:37:52 -5018
DCO 04:23:30 -16.3 AT Up 32.8 128.0 Up 04:09:12 - 04:37:48 -5022
Mohave Valley 04:23:34 -15.7 AT Up 32.0 126.7 Up 04:09:16 - 04:37:52 -5040
Lake Havasu City 04:23:34 -16.1 AT Up 32.4 126.7 Up 04:09:16 - 04:37:52 -5072
Parker 04:23:35 -16.3 AT Up 32.7 126.5 Up 04:09:17 - 04:37:53 -5101
Wildwood 04:23:46 -13.7 AT Up 29.8 122.9 Low 04:09:28 - 04:38:04 -5111
Idyllwild 04:23:42 -15.1 AT Up 31.3 124.3 Up 04:09:24 - 04:38:00 -5138
Blythe 04:23:37 -16.5 AT Up 32.8 126.0 Up 04:09:19 - 04:37:55 -5145
Calipatria 04:23:40 -16.3 AT Up 32.5 124.9 Up 04:09:22 - 04:37:58 -5187
Yuma 04:23:38 -17.1 AT Up 33.3 125.5 Up 04:09:20 - 04:37:56 -5222

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, (2019/07/09 04:21UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 38.04  57
60Bet Oph      17:43:28.3 +04:34:05  2.8 18.94  72
PPM 202138     18:47:28.9 -05:42:19  4.6  0.88  88
PPM 202094     18:44:40.9 -06:32:10  6.8  0.21  87
PPM 202118     18:45:45.3 -06:27:18  8.6  0.12  87
307261         18:45:19.2 -06:24:13 15.8        87
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:07:07 UT

Marc W. Buie, Southwest Research Institute

RECON