RECON: TNO occultation with 307261

Event between (307261) 02MS4 and star UC4-417-087977 with event index number of 118663

Geocentric closest approach at 2018/05/30 08:27:14 UTC

J2000 position of star is 18:43:48.7 -06:38:35
Equinox of date position of star is 18:44:46.5 -06:37:26
Stellar brightness R=15.7, use SENSEUP=128
Star is 27 degrees from the moon. Moon is 99% illuminated.
TNO apparent brightness V=20.3

[RECON map]
TNO is 46.7 AU from the Sun and 45.8 AU from the Earth.
The TNO is moving 21.1 km/sec on the sky relative to the star, or, 2.3 arcsec/hr.
The 1-sigma error in the time of the event is 187 seconds.
The 1-sigma cross-track error in the shadow position is 2351 km.
The sky-plane scale is 33252.8 km/arcsec.

The TNO has an absolute magnitude Hv=3.6
Diameter=1148.2 km assuming a 5% albedo -- 54.4 sec chord
Diameter=468.7 km assuming a 30% albedo -- 22.2 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 307261, (2018/05/30 08:27UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.3 -26:28:17  0.9 37.60  11
60Bet Oph      17:44:23.0 +04:33:39  2.8 18.77  25
PPM 202054     18:43:35.7 -07:03:17  6.5  0.53  26
PPM 202098     18:45:44.3 -06:37:02  8.3  0.23  27
307261         18:44:48.1 -06:37:24 15.7        27
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 4.8 sigma about the mid-time.
The median site spacing is 16.6 km RECON observability=1.0 and success probability=5.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 08:29:19 -18.9 Dark Up 30.2 150.6 Up 08:14:19 - 08:44:19 -4215
Tonasket 08:29:19 -19.1 Dark Up 30.4 150.6 Up 08:14:19 - 08:44:19 -4231
Okanogan 08:29:20 -19.5 Dark Up 30.6 150.3 Up 08:14:20 - 08:44:20 -4257
Brewster 08:29:21 -19.7 Dark Up 30.8 150.0 Up 08:14:21 - 08:44:21 -4278
Manson/Chelan 08:29:23 -20.0 Dark Up 30.9 149.6 Up 08:14:23 - 08:44:23 -4298
Entiat 08:29:23 -20.2 Dark Up 31.0 149.4 Up 08:14:23 - 08:44:23 -4315
Wenatchee 08:29:24 -20.5 Dark Up 31.2 149.2 Up 08:14:24 - 08:44:24 -4334
Ellensburg 08:29:24 -20.9 Dark Up 31.5 148.9 Up 08:14:24 - 08:44:24 -4367
Yakima 08:29:26 -21.3 Dark Up 31.8 148.7 Up 08:14:26 - 08:44:26 -4397
Pasco 08:29:20 -21.5 Dark Up 32.6 150.2 Up 08:14:20 - 08:44:20 -4400
Toppenish/White Swan 08:29:24 -21.5 Dark Up 32.1 148.8 Up 08:14:24 - 08:44:24 -4410
PNWRO 08:29:21 -21.7 Dark Up 32.9 150.4 Up 08:14:21 - 08:44:21 -4415
George/Umatilla 08:29:22 -21.9 Dark Up 32.8 149.8 Up 08:14:22 - 08:44:22 -4428
Goldendale 08:29:27 -22.1 Dark Up 32.4 148.2 Up 08:14:27 - 08:44:27 -4457
The Dalles 08:29:28 -22.3 Dark Up 32.5 147.7 Up 08:14:28 - 08:44:28 -4479
Maupin 08:29:28 -22.7 Dark Up 32.9 147.7 Up 08:14:28 - 08:44:28 -4508
Madras/Culver 08:29:29 -23.3 Dark Up 33.3 147.5 Up 08:14:29 - 08:44:29 -4550
Redmond 08:29:30 -23.7 Dark Up 33.6 147.3 Up 08:14:30 - 08:44:30 -4578
Sisters 08:29:31 -23.7 Dark Up 33.4 146.9 Up 08:14:31 - 08:44:31 -4582
Bend 08:29:31 -23.9 Dark Up 33.7 147.1 Up 08:14:31 - 08:44:31 -4596
Oregon Observatory 08:29:31 -24.1 Dark Up 33.8 146.9 Up 08:14:31 - 08:44:31 -4611
La Pine/Gilchrist 08:29:31 -24.3 Dark Up 34.0 146.7 Up 08:14:31 - 08:44:31 -4628
Niwot 08:28:35 -24.6 Dark Up 42.1 165.0 Up 08:13:35 - 08:43:35 -4651
North Lake 08:29:30 -24.6 Dark Up 34.6 147.2 Up 08:14:30 - 08:44:30 -4652
Paisley 08:29:30 -25.2 Dark Up 35.2 147.4 Up 08:14:30 - 08:44:30 -4689
Chiloquin 08:29:33 -25.4 Dark Up 34.7 145.9 Up 08:14:33 - 08:44:33 -4720
Lakeview 08:29:29 -25.6 Dark Up 35.7 147.4 Up 08:14:29 - 08:44:29 -4726
Klamath Falls 08:29:34 -25.7 Dark Up 35.1 145.9 Up 08:14:34 - 08:44:34 -4745
Tulelake 08:29:33 -26.0 Dark Up 35.4 146.1 Up 08:14:33 - 08:44:33 -4762
Cedarville 08:29:29 -26.3 Dark Up 36.3 147.4 Up 08:14:29 - 08:44:29 -4775
Fall River/Burney 08:29:33 -26.9 Dark Up 36.2 145.8 Up 08:14:33 - 08:44:33 -4833
Susanville 08:29:32 -27.4 Dark Up 37.0 146.4 Up 08:14:32 - 08:44:32 -4871
Gimple 08:29:33 -27.7 Dark Up 37.2 146.0 Up 08:14:33 - 08:44:33 -4897
Greenville 08:29:34 -27.7 Dark Up 37.1 145.9 Up 08:14:34 - 08:44:34 -4898
Quincy 08:29:33 -27.9 Dark Up 37.3 145.9 Up 08:14:33 - 08:44:33 -4915
Portola 08:29:31 -28.0 Dark Up 37.6 146.3 Up 08:14:31 - 08:44:31 -4917
Reno 08:29:30 -28.2 Dark Up 38.1 147.0 Up 08:14:30 - 08:44:30 -4928
Carson City 08:29:30 -28.6 Dark Up 38.4 146.8 Up 08:14:30 - 08:44:30 -4957
Yerington 08:29:28 -28.7 Dark Up 38.8 147.5 Up 08:14:28 - 08:44:28 -4963
Gardnerville 08:29:30 -28.8 Dark Up 38.6 146.8 Up 08:14:30 - 08:44:30 -4977
Hawthorne 08:29:27 -29.1 Dark Up 39.5 147.9 Up 08:14:27 - 08:44:27 -4992
Tonopah 08:29:21 -29.3 Dark Up 40.4 149.3 Up 08:14:21 - 08:44:21 -5008
Lee Vining 08:29:28 -29.7 Dark Up 39.7 147.1 Up 08:14:28 - 08:44:28 -5047
Bishop 08:29:27 -30.2 Dark Up 40.5 147.6 Up 08:14:27 - 08:44:27 -5085
Beatty 08:29:20 -30.4 Dark Up 41.6 149.3 Up 08:14:20 - 08:44:20 -5096
Indian Springs 08:29:17 -30.5 Dark Up 42.3 150.5 Up 08:14:17 - 08:44:17 -5106
Henderson 08:29:14 -30.9 Dark Up 43.1 151.1 Up 08:14:14 - 08:44:14 -5139
Lone Pine 08:29:25 -30.9 Dark Up 41.3 147.7 Up 08:14:25 - 08:44:25 -5144
Patrick 08:29:11 -31.3 Dark Up 44.0 152.2 Up 08:14:11 - 08:44:11 -5174
Searchlight/Boulder City 08:29:14 -31.4 Dark Up 43.6 150.9 Up 08:14:14 - 08:44:14 -5187
DCO 08:29:08 -31.4 Dark Up 44.6 153.0 Up 08:14:08 - 08:44:08 -5188
Kingman/Dolan Springs 08:29:11 -31.5 Dark Up 44.2 151.9 Up 08:14:11 - 08:44:11 -5196
Laughlin/Bullhead City 08:29:13 -31.7 Dark Up 44.0 151.2 Up 08:14:13 - 08:44:13 -5207
Mohave Valley 08:29:13 -31.9 Dark Up 44.2 151.1 Up 08:14:13 - 08:44:13 -5230
Lake Havasu City 08:29:13 -32.3 Dark Up 44.7 151.2 Up 08:14:13 - 08:44:13 -5260
Parker 08:29:13 -32.6 Dark Up 45.0 151.1 Up 08:14:13 - 08:44:13 -5290
CPSLO 08:29:37 -32.5 Dark Up 41.2 144.0 Up 08:14:37 - 08:44:37 -5300
Blythe 08:29:14 -33.2 Dark Up 45.3 150.5 Up 08:14:14 - 08:44:14 -5341
Idyllwild 08:29:22 -33.5 Dark Up 44.3 147.9 Up 08:14:22 - 08:44:22 -5368
Wildwood 08:29:29 -33.4 Dark Up 43.2 145.8 Up 08:14:29 - 08:44:29 -5369
Calipatria 08:29:18 -33.8 Dark Up 45.4 149.0 Up 08:14:18 - 08:44:18 -5401
Yuma 08:29:13 -34.1 Dark Up 46.1 149.9 Up 08:14:13 - 08:44:13 -5423

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, (2018/05/30 08:27UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 37.60  11
60Bet Oph      17:43:28.3 +04:34:05  2.8 18.77  25
PPM 202054     18:42:36.1 -07:04:26  6.5  0.53  26
PPM 202098     18:44:44.9 -06:38:15  8.3  0.23  27
307261         18:43:48.7 -06:38:35 15.7        27
Positions are for J2000

Event circumstances last updated at 2017/12/04 18:41:05 UT

Marc W. Buie, Southwest Research Institute

RECON