RECON: TNO occultation with 503858

Event between (503858) 98HQ151 and star UC4-383-118625 with event index number of 326870

Geocentric closest approach at 2019/08/01 06:00:00 UTC

J2000 position of star is 18:38:15.5 -13:28:30
Equinox of date position of star is 18:39:19.3 -13:27:26
Stellar brightness R=16.4, use SENSEUP=128
Star is 147 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=24.0

[RECON map]
TNO is 32.5 AU from the Sun and 31.6 AU from the Earth.
The TNO is moving 20.1 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 182 seconds.
The 1-sigma cross-track error in the shadow position is 1350 km.
The sky-plane scale is 22911.8 km/arcsec.

The TNO has an absolute magnitude Hv=8.8
Diameter=104.7 km assuming a 5% albedo -- 5.2 sec chord
Diameter=42.8 km assuming a 30% albedo -- 2.1 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 503858, (2019/08/01 06:00UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:36.7 -26:28:26  0.9 32.81 119
Nunki          18:56:28.7 -26:16:15  2.0 13.43 152
PPM 234707     18:34:46.2 -14:50:15  6.1  1.77 146
PPM 234817     18:39:01.8 -13:27:17  7.7  0.08 147
503858         18:39:21.9 -13:27:24 16.4       147
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 14.2 km RECON observability=1.0 and success probability=15.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Summerland 05:59:18 -16.6 AT Down 26.7 180.1 Low 05:44:18 - 06:14:18 2389
Kelowna 05:59:16 -16.7 AT Down 26.6 180.5 Low 05:44:16 - 06:14:16 2387
Penticton 05:59:17 -16.9 AT Down 27.0 180.3 Low 05:44:17 - 06:14:17 2371
Okanagan Falls 05:59:17 -17.1 AT Down 27.2 180.3 Low 05:44:17 - 06:14:17 2362
Oliver 05:59:17 -17.2 AT Down 27.3 180.3 Low 05:44:17 - 06:14:17 2354
Anarchist Mountain Observatory 05:59:17 -17.4 AT Down 27.5 180.5 Low 05:44:17 - 06:14:17 2343
Oroville 05:59:17 -17.5 AT Down 27.6 180.4 Low 05:44:17 - 06:14:17 2340
Tonasket 05:59:17 -17.7 AT Down 27.8 180.4 Low 05:44:17 - 06:14:17 2328
Okanogan 05:59:18 -17.9 AT Down 28.2 180.3 Low 05:44:18 - 06:14:18 2312
Brewster 05:59:19 -18.1 Dark Down 28.4 180.0 Low 05:44:19 - 06:14:19 2300
Manson/Chelan 05:59:19 -18.1 Dark Down 28.6 179.6 Low 05:44:19 - 06:14:19 2293
Entiat 05:59:21 -18.3 Dark Down 28.9 179.6 Low 05:44:21 - 06:14:21 2283
Wenatchee 05:59:20 -18.5 Dark Down 29.1 179.5 Low 05:44:20 - 06:14:20 2270
Ellensburg 05:59:21 -18.7 Dark Down 29.5 179.2 Low 05:44:21 - 06:14:21 2250
Yakima 05:59:22 -19.1 Dark Down 29.9 179.2 Low 05:44:22 - 06:14:22 2228
Toppenish/White Swan 05:59:22 -19.3 Dark Down 30.1 179.4 Up 05:44:22 - 06:14:22 2215
Pasco 05:59:17 -19.9 Dark Down 30.3 180.8 Up 05:44:17 - 06:14:17 2193
Goldendale 05:59:23 -19.6 Dark Down 30.7 178.9 Up 05:44:23 - 06:14:23 2189
The Dalles 05:59:25 -19.7 Dark Down 30.9 178.5 Up 05:44:25 - 06:14:25 2180
George/Umatilla 05:59:18 -20.1 Dark Down 30.6 180.5 Up 05:44:18 - 06:14:18 2177
PNWRO 05:59:16 -20.2 Dark Down 30.5 181.0 Up 05:44:16 - 06:14:16 2177
Maupin 05:59:25 -20.1 Dark Down 31.3 178.6 Up 05:44:25 - 06:14:25 2156
Madras/Culver 05:59:25 -20.5 Dark Down 31.9 178.5 Up 05:44:25 - 06:14:25 2125
Sisters 05:59:27 -20.6 Dark Down 32.2 178.0 Up 05:44:27 - 06:14:27 2110
Redmond 05:59:26 -20.8 Dark Down 32.2 178.5 Up 05:44:26 - 06:14:26 2104
Bend 05:59:26 -20.9 Dark Down 32.5 178.3 Up 05:44:26 - 06:14:26 2094
Oregon Observatory 05:59:27 -21.0 Dark Down 32.6 178.2 Up 05:44:27 - 06:14:27 2085
La Pine/Gilchrist 05:59:27 -21.1 Dark Down 32.8 178.1 Up 05:44:27 - 06:14:27 2073
North Lake 05:59:25 -21.7 Dark Down 33.3 178.8 Up 05:44:25 - 06:14:25 2041
Chiloquin 05:59:29 -21.9 Dark Down 33.9 177.7 Up 05:44:29 - 06:14:29 2011
Paisley 05:59:24 -22.4 Dark Down 33.8 179.2 Up 05:44:24 - 06:14:24 2003
Klamath Falls 05:59:29 -22.2 Dark Down 34.3 177.8 Up 05:44:29 - 06:14:29 1989
Lakeview 05:59:23 -22.9 Dark Down 34.3 179.4 Up 05:44:23 - 06:14:23 1969
Tulelake 05:59:28 -22.6 Dark Down 34.5 178.1 Up 05:44:28 - 06:14:28 1969
Cedarville 05:59:23 -23.5 Dark Down 35.0 179.6 Up 05:44:23 - 06:14:23 1926
Fall River/Burney 05:59:28 -23.4 Dark Down 35.5 178.2 Up 05:44:28 - 06:14:28 1911
Susanville 05:59:26 -24.2 Dark Down 36.1 179.0 Up 05:44:26 - 06:14:26 1861
Greenville 05:59:27 -24.3 Dark Down 36.4 178.7 Up 05:44:27 - 06:14:27 1847
Gimple 05:59:27 -24.3 Dark Down 36.4 178.8 Up 05:44:27 - 06:14:27 1846
Quincy 05:59:27 -24.5 Dark Down 36.6 178.7 Up 05:44:27 - 06:14:27 1834
Portola 05:59:25 -24.8 Dark Down 36.7 179.3 Up 05:44:25 - 06:14:25 1820
Reno 05:59:23 -25.3 Dark Down 37.0 180.0 Up 05:44:23 - 06:14:23 1794
Carson City 05:59:23 -25.6 Dark Down 37.3 180.1 Up 05:44:23 - 06:14:23 1770
Gardnerville 05:59:23 -25.8 Dark Down 37.6 180.1 Up 05:44:23 - 06:14:23 1753
Yerington 05:59:20 -26.0 Dark Down 37.5 180.8 Up 05:44:20 - 06:14:20 1748
Hawthorne 05:59:18 -26.6 Dark Down 38.0 181.5 Up 05:44:18 - 06:14:18 1710
Lee Vining 05:59:20 -26.9 Dark Down 38.6 180.9 Up 05:44:20 - 06:14:20 1678
Tonopah 05:59:12 -27.6 Dark Down 38.4 183.2 Up 05:44:12 - 06:14:12 1659
Bishop 05:59:18 -27.7 Dark Down 39.1 181.8 Up 05:44:18 - 06:14:18 1627
Niwot 05:58:23 -29.7 Dark Down 34.8 197.2 Up 05:43:23 - 06:13:23 1611
Beatty 05:59:11 -28.8 Dark Down 39.5 183.8 Up 05:44:11 - 06:14:11 1572
Lone Pine 05:59:16 -28.5 Dark Down 39.9 182.2 Up 05:44:16 - 06:14:16 1569
Indian Springs 05:59:06 -29.5 Dark Down 39.8 185.2 Up 05:44:06 - 06:14:06 1533
CPSLO 05:59:29 -28.4 Dark Down 41.2 179.0 Up 05:44:29 - 06:14:29 1512
Henderson 05:59:03 -30.2 Dark Down 40.3 186.1 Up 05:44:03 - 06:14:03 1484
Searchlight/Boulder City 05:59:03 -30.8 Dark Down 40.8 186.2 Up 05:44:03 - 06:14:03 1442
Patrick 05:58:59 -31.2 Dark Down 40.8 187.6 Up 05:43:59 - 06:13:59 1422
Laughlin/Bullhead City 05:59:02 -31.2 Dark Down 41.1 186.7 Up 05:44:02 - 06:14:02 1415
Kingman/Dolan Springs 05:59:00 -31.3 Dark Down 41.0 187.4 Up 05:44:00 - 06:14:00 1408
Wildwood 05:59:20 -30.4 Dark Down 42.4 181.6 Up 05:44:20 - 06:14:20 1395
Mohave Valley 05:59:02 -31.4 Dark Down 41.4 186.7 Up 05:44:02 - 06:14:02 1395
DCO 05:58:56 -31.8 Dark Down 41.0 188.5 Up 05:43:56 - 06:13:56 1388
Lake Havasu City 05:59:01 -31.8 Dark Down 41.8 187.1 Up 05:44:01 - 06:14:01 1361
Idyllwild 05:59:12 -31.5 Dark Down 42.7 184.1 Up 05:44:12 - 06:14:12 1341
Parker 05:59:01 -32.2 Dark Down 42.1 187.2 Up 05:44:01 - 06:14:01 1334
Blythe 05:59:02 -32.5 Dark Down 42.7 186.8 Up 05:44:02 - 06:14:02 1299
Calipatria 05:59:07 -32.5 Dark Down 43.2 185.7 Up 05:44:07 - 06:14:07 1277
Yuma 05:59:03 -33.3 Dark Down 43.6 186.9 Up 05:44:03 - 06:14:03 1230

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 503858, (2019/08/01 06:00UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 32.81 119
Nunki          18:55:15.9 -26:17:49  2.0 13.43 152
PPM 234707     18:33:39.1 -14:51:14  6.1  1.77 146
PPM 234817     18:37:55.4 -13:28:23  7.7  0.08 147
503858         18:38:15.5 -13:28:30 16.4       147
Positions are for J2000

Event circumstances last updated at 2018/10/24 21:49:18 UT

Marc W. Buie, Southwest Research Institute

RECON