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 08:21:14 UTC

J2000 position of star is 18:43:48.7 -06:38:35
Equinox of date position of star is 18:44:45.4 -06:37:27
Stellar brightness R=15.7, use SENSEUP=128
Star is 27 degrees from the moon. Moon is 99% illuminated.
TNO apparent brightness V=20.4

[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 437 seconds.
The 1-sigma cross-track error in the shadow position is 4079 km.
The sky-plane scale is 33253.2 km/arcsec.

The TNO has an absolute magnitude Hv=3.7
Diameter=1096.5 km assuming a 5% albedo -- 51.9 sec chord
Diameter=447.7 km assuming a 30% albedo -- 21.2 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 307261, (2018/05/30 08:21UT)
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 2.1 sigma about the mid-time.
The median site spacing is 16.7 km RECON observability=1.0 and success probability=7.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 08:23:22 -19.0 Dark Up 29.7 149.0 Low 08:08:22 - 08:38:22 -2032
Tonasket 08:23:22 -19.2 Dark Up 29.9 149.0 Low 08:08:22 - 08:38:22 -2048
Okanogan 08:23:23 -19.6 Dark Up 30.1 148.7 Up 08:08:23 - 08:38:23 -2074
Brewster 08:23:24 -19.9 Dark Up 30.3 148.4 Up 08:08:24 - 08:38:24 -2096
Manson/Chelan 08:23:26 -20.1 Dark Up 30.4 148.0 Up 08:08:26 - 08:38:26 -2116
Entiat 08:23:26 -20.3 Dark Up 30.5 147.8 Up 08:08:26 - 08:38:26 -2132
Wenatchee 08:23:27 -20.6 Dark Up 30.7 147.6 Up 08:08:27 - 08:38:27 -2152
Ellensburg 08:23:28 -21.0 Dark Up 31.0 147.3 Up 08:08:28 - 08:38:28 -2185
Yakima 08:23:28 -21.4 Dark Up 31.3 147.1 Up 08:08:28 - 08:38:28 -2215
Pasco 08:23:25 -21.6 Dark Up 32.1 148.6 Up 08:08:25 - 08:38:25 -2218
Toppenish/White Swan 08:23:28 -21.6 Dark Up 31.5 147.2 Up 08:08:28 - 08:38:28 -2228
PNWRO 08:23:24 -21.9 Dark Up 32.4 148.7 Up 08:08:24 - 08:38:24 -2232
George/Umatilla 08:23:25 -22.0 Dark Up 32.3 148.2 Up 08:08:25 - 08:38:25 -2246
Goldendale 08:23:30 -22.2 Dark Up 31.9 146.6 Up 08:08:30 - 08:38:30 -2275
The Dalles 08:23:32 -22.5 Dark Up 31.9 146.1 Up 08:08:32 - 08:38:32 -2297
Maupin 08:23:32 -22.9 Dark Up 32.3 146.1 Up 08:08:32 - 08:38:32 -2327
Madras/Culver 08:23:32 -23.4 Dark Up 32.7 145.9 Up 08:08:32 - 08:38:32 -2368
Redmond 08:23:33 -23.8 Dark Up 33.0 145.7 Up 08:08:33 - 08:38:33 -2396
Sisters 08:23:35 -23.8 Dark Up 32.8 145.3 Up 08:08:35 - 08:38:35 -2400
Bend 08:23:34 -24.0 Dark Up 33.1 145.4 Up 08:08:34 - 08:38:34 -2414
Oregon Observatory 08:23:35 -24.2 Dark Up 33.2 145.2 Up 08:08:35 - 08:38:35 -2430
La Pine/Gilchrist 08:23:35 -24.4 Dark Up 33.4 145.1 Up 08:08:35 - 08:38:35 -2446
Niwot 08:22:40 -25.1 Dark Up 41.8 163.0 Up 08:07:40 - 08:37:40 -2468
North Lake 08:23:33 -24.8 Dark Up 34.0 145.6 Up 08:08:33 - 08:38:33 -2470
Paisley 08:23:33 -25.3 Dark Up 34.6 145.8 Up 08:08:33 - 08:38:33 -2507
Chiloquin 08:23:38 -25.5 Dark Up 34.1 144.3 Up 08:08:38 - 08:38:38 -2538
Lakeview 08:23:33 -25.8 Dark Up 35.1 145.8 Up 08:08:33 - 08:38:33 -2544
Klamath Falls 08:23:37 -25.8 Dark Up 34.4 144.2 Up 08:08:37 - 08:38:37 -2564
Tulelake 08:23:37 -26.1 Dark Up 34.8 144.5 Up 08:08:37 - 08:38:37 -2580
Cedarville 08:23:33 -26.4 Dark Up 35.7 145.7 Up 08:08:33 - 08:38:33 -2593
Fall River/Burney 08:23:38 -27.0 Dark Up 35.6 144.2 Up 08:08:38 - 08:38:38 -2652
Susanville 08:23:36 -27.6 Dark Up 36.4 144.7 Up 08:08:36 - 08:38:36 -2691
Gimple 08:23:36 -27.9 Dark Up 36.5 144.4 Up 08:08:36 - 08:38:36 -2717
Greenville 08:23:37 -27.9 Dark Up 36.5 144.3 Up 08:08:37 - 08:38:37 -2718
Quincy 08:23:37 -28.1 Dark Up 36.7 144.2 Up 08:08:37 - 08:38:37 -2734
Portola 08:23:36 -28.2 Dark Up 37.0 144.7 Up 08:08:36 - 08:38:36 -2737
Reno 08:23:33 -28.4 Dark Up 37.5 145.3 Up 08:08:33 - 08:38:33 -2748
Carson City 08:23:34 -28.7 Dark Up 37.8 145.1 Up 08:08:34 - 08:38:34 -2777
Yerington 08:23:32 -28.8 Dark Up 38.2 145.8 Up 08:08:32 - 08:38:32 -2782
Gardnerville 08:23:34 -28.9 Dark Up 38.0 145.1 Up 08:08:34 - 08:38:34 -2796
Hawthorne 08:23:31 -29.2 Dark Up 38.8 146.2 Up 08:08:31 - 08:38:31 -2812
Tonopah 08:23:26 -29.5 Dark Up 39.8 147.6 Up 08:08:26 - 08:38:26 -2827
Lee Vining 08:23:32 -29.9 Dark Up 39.1 145.3 Up 08:08:32 - 08:38:32 -2867
Bishop 08:23:30 -30.4 Dark Up 39.9 145.9 Up 08:08:30 - 08:38:30 -2905
Beatty 08:23:25 -30.6 Dark Up 41.0 147.6 Up 08:08:25 - 08:38:25 -2917
Indian Springs 08:23:21 -30.8 Dark Up 41.7 148.7 Up 08:08:21 - 08:38:21 -2926
Henderson 08:23:18 -31.2 Dark Up 42.5 149.3 Up 08:08:18 - 08:38:18 -2960
Lone Pine 08:23:30 -31.1 Dark Up 40.7 145.9 Up 08:08:30 - 08:38:30 -2964
Patrick 08:23:14 -31.6 Dark Up 43.4 150.3 Up 08:08:14 - 08:38:14 -2994
Searchlight/Boulder City 08:23:18 -31.7 Dark Up 43.0 149.1 Up 08:08:18 - 08:38:18 -3007
DCO 08:23:11 -31.7 Dark Up 44.0 151.1 Up 08:08:11 - 08:38:11 -3008
Kingman/Dolan Springs 08:23:14 -31.8 Dark Up 43.6 150.0 Up 08:08:14 - 08:38:14 -3016
Laughlin/Bullhead City 08:23:18 -31.9 Dark Up 43.4 149.4 Up 08:08:18 - 08:38:18 -3027
Mohave Valley 08:23:18 -32.2 Dark Up 43.6 149.2 Up 08:08:18 - 08:38:18 -3051
Lake Havasu City 08:23:17 -32.6 Dark Up 44.1 149.3 Up 08:08:17 - 08:38:17 -3081
Parker 08:23:16 -32.9 Dark Up 44.4 149.2 Up 08:08:16 - 08:38:16 -3111
CPSLO 08:23:40 -32.6 Dark Up 40.5 142.3 Up 08:08:40 - 08:38:40 -3121
Blythe 08:23:18 -33.5 Dark Up 44.7 148.6 Up 08:08:18 - 08:38:18 -3162
Idyllwild 08:23:26 -33.7 Dark Up 43.7 146.1 Up 08:08:26 - 08:38:26 -3188
Wildwood 08:23:33 -33.6 Dark Up 42.5 144.0 Up 08:08:33 - 08:38:33 -3191
Calipatria 08:23:22 -34.1 Dark Up 44.7 147.2 Up 08:08:22 - 08:38:22 -3222
Yuma 08:23:19 -34.4 Dark Up 45.5 148.0 Up 08:08:19 - 08:38:19 -3245

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 08:21UT)
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 2017/08/04 18:01:30 UT

Marc W. Buie, Southwest Research Institute

RECON