RECON: TNO occultation with 307261

Event between (307261) 02MS4 and star UC4-420-104493 with event index number of 340250

Geocentric closest approach at 2020/06/06 08:23:25 UTC

J2000 position of star is 18:51:53.3 -06:10:45
Equinox of date position of star is 18:52:53.8 -06:09:19
Stellar brightness R=16.1, use SENSEUP=128
Star is 26 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=20.3

[RECON map]
TNO is 46.5 AU from the Sun and 45.7 AU from the Earth.
The TNO is moving 22.2 km/sec on the sky relative to the star, or, 2.4 arcsec/hr.
The 1-sigma error in the time of the event is 205 seconds.
The 1-sigma cross-track error in the shadow position is 2215 km.
The sky-plane scale is 33111.6 km/arcsec.

The TNO has an absolute magnitude Hv=3.6
Diameter=1148.2 km assuming a 5% albedo -- 51.6 sec chord
Diameter=468.7 km assuming a 30% albedo -- 21.1 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 307261, (2020/06/06 08:23UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:39.8 -26:28:32  0.9 39.50  15
Nunki          18:56:31.8 -26:16:10  2.0 20.13  19
PPM 202138     18:48:34.4 -05:40:54  4.6  1.19  25
PPM 202252     18:53:51.2 -05:49:22  8.1  0.40  26
PPM 202232     18:53:05.2 -05:53:28  8.9  0.26  26
307261         18:52:59.0 -06:09:12 16.1        26
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 4.4 sigma about the mid-time.
The median site spacing is 17.4 km RECON observability=1.0 and success probability=13.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 08:24:57 -17.1 AT Up 31.1 155.5 Up 08:09:57 - 08:39:57 -1431
Summerland 08:24:58 -17.2 AT Up 31.0 155.1 Up 08:09:58 - 08:39:58 -1437
Penticton 08:24:58 -17.5 AT Up 31.3 155.3 Up 08:09:58 - 08:39:58 -1456
Okanagan Falls 08:24:58 -17.7 AT Up 31.5 155.2 Up 08:09:58 - 08:39:58 -1469
Oliver 08:24:58 -17.8 AT Up 31.7 155.2 Up 08:09:58 - 08:39:58 -1480
Anarchist Mountain Observatory 08:24:58 -18.0 AT Up 31.9 155.3 Up 08:09:58 - 08:39:58 -1489
Oroville 08:24:58 -18.1 Dark Up 31.9 155.2 Up 08:09:58 - 08:39:58 -1495
Tonasket 08:24:59 -18.3 Dark Up 32.1 155.2 Up 08:09:59 - 08:39:59 -1511
Okanogan 08:24:59 -18.6 Dark Up 32.4 154.9 Up 08:09:59 - 08:39:59 -1535
Brewster 08:25:00 -18.9 Dark Up 32.6 154.6 Up 08:10:00 - 08:40:00 -1555
Manson/Chelan 08:25:01 -19.2 Dark Up 32.7 154.2 Up 08:10:01 - 08:40:01 -1573
Entiat 08:25:02 -19.4 Dark Up 32.8 154.0 Up 08:10:02 - 08:40:02 -1589
Wenatchee 08:25:02 -19.7 Dark Up 33.0 153.8 Up 08:10:02 - 08:40:02 -1608
Ellensburg 08:25:04 -20.1 Dark Up 33.4 153.5 Up 08:10:04 - 08:40:04 -1639
Yakima 08:25:04 -20.5 Dark Up 33.7 153.3 Up 08:10:04 - 08:40:04 -1668
Pasco 08:25:00 -20.7 Dark Up 34.4 154.9 Up 08:10:00 - 08:40:00 -1677
Toppenish/White Swan 08:25:04 -20.7 Dark Up 34.0 153.5 Up 08:10:04 - 08:40:04 -1682
PNWRO 08:24:59 -20.9 Dark Up 34.7 155.1 Up 08:09:59 - 08:39:59 -1692
George/Umatilla 08:25:01 -21.1 Dark Up 34.7 154.5 Up 08:10:01 - 08:40:01 -1703
Goldendale 08:25:06 -21.3 Dark Up 34.3 152.8 Up 08:10:06 - 08:40:06 -1726
The Dalles 08:25:07 -21.5 Dark Up 34.4 152.3 Up 08:10:07 - 08:40:07 -1746
Maupin 08:25:07 -21.9 Dark Up 34.8 152.3 Up 08:10:07 - 08:40:07 -1775
Madras/Culver 08:25:08 -22.5 Dark Up 35.3 152.1 Up 08:10:08 - 08:40:08 -1816
Redmond 08:25:08 -22.8 Dark Up 35.6 151.9 Up 08:10:08 - 08:40:08 -1843
Sisters 08:25:10 -22.8 Dark Up 35.4 151.5 Up 08:10:10 - 08:40:10 -1845
Bend 08:25:09 -23.1 Dark Up 35.7 151.7 Up 08:10:09 - 08:40:09 -1860
Oregon Observatory 08:25:10 -23.2 Dark Up 35.8 151.5 Up 08:10:10 - 08:40:10 -1874
La Pine/Gilchrist 08:25:10 -23.4 Dark Up 36.0 151.3 Up 08:10:10 - 08:40:10 -1890
North Lake 08:25:09 -23.8 Dark Up 36.6 151.9 Up 08:10:09 - 08:40:09 -1916
Paisley 08:25:08 -24.4 Dark Up 37.2 152.1 Up 08:10:08 - 08:40:08 -1954
Chiloquin 08:25:12 -24.6 Dark Up 36.8 150.5 Up 08:10:12 - 08:40:12 -1979
Niwot 08:24:15 -24.1 Dark Up 43.3 170.6 Up 08:09:15 - 08:39:15 -1990
Lakeview 08:25:07 -24.8 Dark Up 37.7 152.1 Up 08:10:07 - 08:40:07 -1991
Klamath Falls 08:25:13 -24.9 Dark Up 37.2 150.5 Up 08:10:13 - 08:40:13 -2004
Tulelake 08:25:12 -25.2 Dark Up 37.5 150.8 Up 08:10:12 - 08:40:12 -2022
Cedarville 08:25:07 -25.5 Dark Up 38.3 152.1 Up 08:10:07 - 08:40:07 -2040
Fall River/Burney 08:25:12 -26.1 Dark Up 38.3 150.5 Up 08:10:12 - 08:40:12 -2092
Susanville 08:25:10 -26.6 Dark Up 39.2 151.1 Up 08:10:10 - 08:40:10 -2133
Gimple 08:25:11 -26.9 Dark Up 39.3 150.8 Up 08:10:11 - 08:40:11 -2157
Greenville 08:25:11 -26.9 Dark Up 39.3 150.7 Up 08:10:11 - 08:40:11 -2158
Quincy 08:25:11 -27.1 Dark Up 39.5 150.6 Up 08:10:11 - 08:40:11 -2174
Portola 08:25:10 -27.2 Dark Up 39.8 151.1 Up 08:10:10 - 08:40:10 -2179
Reno 08:25:08 -27.4 Dark Up 40.2 151.8 Up 08:10:08 - 08:40:08 -2193
Carson City 08:25:08 -27.8 Dark Up 40.5 151.7 Up 08:10:08 - 08:40:08 -2221
Yerington 08:25:06 -27.9 Dark Up 40.9 152.4 Up 08:10:06 - 08:40:06 -2230
Gardnerville 08:25:08 -28.0 Dark Up 40.8 151.6 Up 08:10:08 - 08:40:08 -2241
Hawthorne 08:25:05 -28.3 Dark Up 41.6 152.8 Up 08:10:05 - 08:40:05 -2261
Tonopah 08:25:00 -28.6 Dark Up 42.5 154.4 Up 08:10:00 - 08:40:00 -2283
Lee Vining 08:25:06 -28.9 Dark Up 41.9 152.0 Up 08:10:06 - 08:40:06 -2313
Bishop 08:25:05 -29.4 Dark Up 42.7 152.6 Up 08:10:05 - 08:40:05 -2354
Beatty 08:24:59 -29.7 Dark Up 43.7 154.5 Up 08:09:59 - 08:39:59 -2373
Indian Springs 08:24:55 -29.8 Dark Up 44.3 155.7 Up 08:09:55 - 08:39:55 -2388
Lone Pine 08:25:04 -30.1 Dark Up 43.5 152.7 Up 08:10:04 - 08:40:04 -2414
Henderson 08:24:52 -30.2 Dark Up 45.0 156.4 Up 08:09:52 - 08:39:52 -2424
Patrick 08:24:48 -30.7 Dark Up 46.0 157.7 Up 08:09:48 - 08:39:48 -2464
Searchlight/Boulder City 08:24:52 -30.8 Dark Up 45.6 156.3 Up 08:09:52 - 08:39:52 -2472
DCO 08:24:46 -30.8 Dark Up 46.4 158.5 Up 08:09:46 - 08:39:46 -2482
Kingman/Dolan Springs 08:24:49 -30.9 Dark Up 46.1 157.3 Up 08:09:49 - 08:39:49 -2485
Laughlin/Bullhead City 08:24:51 -31.0 Dark Up 46.0 156.6 Up 08:09:51 - 08:39:51 -2493
Mohave Valley 08:24:51 -31.3 Dark Up 46.2 156.5 Up 08:09:51 - 08:39:51 -2516
Lake Havasu City 08:24:51 -31.6 Dark Up 46.7 156.7 Up 08:09:51 - 08:39:51 -2548
CPSLO 08:25:14 -31.7 Dark Up 43.6 148.9 Up 08:10:14 - 08:40:14 -2555
Parker 08:24:51 -32.0 Dark Up 47.0 156.6 Up 08:09:51 - 08:39:51 -2578
Blythe 08:24:52 -32.5 Dark Up 47.4 155.9 Up 08:09:52 - 08:39:52 -2627
Wildwood 08:25:07 -32.7 Dark Up 45.5 150.9 Up 08:10:07 - 08:40:07 -2634
Idyllwild 08:25:00 -32.8 Dark Up 46.5 153.1 Up 08:10:00 - 08:40:00 -2642
Calipatria 08:24:56 -33.2 Dark Up 47.5 154.4 Up 08:09:56 - 08:39:56 -2681
Yuma 08:24:52 -33.4 Dark Up 48.2 155.5 Up 08:09:52 - 08:39:52 -2708

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, (2020/06/06 08:23UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 39.50  15
Nunki          18:55:15.9 -26:17:49  2.0 20.13  19
PPM 202138     18:47:28.9 -05:42:19  4.6  1.19  25
PPM 202252     18:52:45.7 -05:50:56  8.1  0.40  26
PPM 202232     18:51:59.6 -05:55:01  8.9  0.26  26
307261         18:51:53.3 -06:10:45 16.1        26
Positions are for J2000

Event circumstances last updated at 2018/10/26 21:15:00 UT

Marc W. Buie, Southwest Research Institute

RECON