RECON: TNO occultation with 13MR18

Event between 13MR18 and star GA0980:04806485 with event index number of 2068963

Geocentric closest approach at 2025/09/08 04:20:14 UTC

J2000 position of star is 17:18:07.7 +08:10:06
Equinox of date position of star is 17:19:10.8 +08:08:48
Stellar brightness G=15.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 93 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=22.4

[RECON map]
TNO is 26.6 AU from the Sun and 26.5 AU from the Earth.
The TNO is moving 16.3 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 114 seconds.
The 1-sigma cross-track error in the shadow position is 3317 km.
The sky-plane scale is 19254.0 km/arcsec.

The TNO has an absolute magnitude Hv=7.9
Diameter=158.5 km assuming a 5% albedo -- 9.7 sec chord
Diameter=64.7 km assuming a 30% albedo -- 4.0 sec chord
Dynamical classification is 3:2E+6:4II
 
 
 
 
 
 

Star training set for 13MR18, (2025/09/08 04:21UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:48.5 +38:48:31  0.0 35.37  79
Rasalhague     17:36:07.6 +12:32:36  2.1  6.03  89
PPM 163642     17:12:59.6 +07:51:55  6.3  1.60  94
PPM 163827     17:21:14.4 +07:56:43  8.2  0.50  92
PPM 163795     17:19:39.7 +08:01:56  9.2  0.13  93
PPM 163783     17:19:18.2 +08:16:18 10.8  0.13  93
13MR18         17:19:21.8 +08:08:34 15.2        93
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 6.0 km RECON observability=1.0 and success probability=10.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Dunrhomin 04:17:43 -31.2 Dark Up 37.2 245.8 Up 04:07:43 - 04:27:44 -1070
George/Scottsdale 04:18:22 -30.9 Dark Up 44.7 245.2 Up 04:08:22 - 04:28:23 -1371
Patrick 04:18:10 -28.6 Dark Up 45.4 241.7 Up 04:08:09 - 04:28:10 -1536
Kingman/Dolan Springs 04:18:11 -28.6 Dark Up 45.7 241.8 Up 04:08:10 - 04:28:11 -1547
Parker 04:18:17 -28.9 Dark Up 46.3 242.5 Up 04:08:17 - 04:28:18 -1551
Lake Havasu City 04:18:16 -28.7 Dark Up 46.2 242.2 Up 04:08:15 - 04:28:16 -1557
Yuma 04:18:27 -29.5 Dark Up 47.2 243.6 Up 04:08:27 - 04:28:28 -1560
Blythe 04:18:21 -29.0 Dark Up 46.8 242.7 Up 04:08:21 - 04:28:22 -1567
Mohave Valley 04:18:12 -28.4 Dark Up 46.2 241.5 Up 04:08:12 - 04:28:13 -1580
Laughlin/Bullhead City 04:18:11 -28.2 Dark Up 46.1 241.3 Up 04:08:11 - 04:28:12 -1584
Henderson 04:18:06 -27.5 Dark Up 45.9 240.1 Up 04:08:06 - 04:28:07 -1624
Calipatria 04:18:24 -28.6 Dark Up 47.7 242.3 Up 04:08:23 - 04:28:24 -1630
Indian Springs 04:18:02 -26.7 Dark Up 46.2 238.9 Up 04:08:01 - 04:28:02 -1681
Idyllwild 04:18:18 -27.4 Dark Up 48.3 240.5 Up 04:08:18 - 04:28:19 -1724
Beatty 04:17:58 -25.8 Dark Up 46.7 237.4 Up 04:07:58 - 04:27:59 -1763
Tonopah 04:17:52 -24.9 Dark Up 46.4 235.9 Up 04:07:51 - 04:27:52 -1810
Wildwood 04:18:15 -25.8 Dark Up 49.5 238.2 Up 04:08:15 - 04:28:16 -1871
Bishop 04:17:55 -24.4 Dark Up 47.6 235.2 Up 04:07:54 - 04:27:55 -1887
Hawthorne 04:17:48 -23.6 Dark Up 47.1 233.9 Up 04:07:47 - 04:27:48 -1918
Lee Vining 04:17:49 -23.6 Dark Up 47.7 233.8 Up 04:07:48 - 04:27:49 -1947
Yerington 04:17:44 -23.0 Dark Up 47.1 232.9 Up 04:07:44 - 04:27:45 -1962
Gardnerville 04:17:43 -22.7 Dark Up 47.5 232.2 Up 04:07:43 - 04:27:44 -2004
Carson City 04:17:43 -22.5 Dark Up 47.4 232.0 Up 04:07:42 - 04:27:43 -2011
Reno 04:17:40 -22.3 Dark Up 47.2 231.6 Up 04:07:40 - 04:27:41 -2017
CPSLO 04:18:06 -23.8 Dark Up 50.2 234.7 Up 04:08:06 - 04:28:07 -2038
PNWRO 04:17:01 -19.6 Dark Up 42.6 227.6 Up 04:07:01 - 04:27:02 -2059
Portola 04:17:36 -21.7 Dark Up 47.4 230.6 Up 04:07:36 - 04:27:37 -2067
Cedarville 04:17:27 -21.1 Dark Up 46.2 229.5 Up 04:07:26 - 04:27:27 -2068
Pasco 04:16:59 -19.3 Dark Up 42.5 227.2 Up 04:06:59 - 04:27:00 -2078
Susanville 04:17:34 -21.3 Dark Up 47.2 229.9 Up 04:07:33 - 04:27:34 -2088
Lakeview 04:17:24 -20.7 Dark Up 45.9 228.8 Up 04:07:23 - 04:27:24 -2090
Gimple 04:17:36 -21.3 Dark Up 47.5 229.9 Up 04:07:36 - 04:27:37 -2100
Quincy 04:17:36 -21.4 Dark Up 47.6 230.0 Up 04:07:36 - 04:27:37 -2103
Greenville 04:17:36 -21.3 Dark Up 47.5 229.8 Up 04:07:35 - 04:27:36 -2106
Paisley 04:17:20 -20.3 Dark Up 45.6 228.2 Up 04:07:20 - 04:27:21 -2111
North Lake 04:17:15 -19.8 Dark Up 45.5 227.3 Up 04:07:15 - 04:27:16 -2144
Fall River/Burney 04:17:30 -20.5 Dark Up 47.2 228.5 Up 04:07:30 - 04:27:31 -2149
Tonasket 04:16:46 -17.8 AT Up 41.0 225.2 Up 04:06:46 - 04:26:47 -2149
Anarchist Mountain Observatory 04:16:44 -17.7 AT Up 40.8 225.0 Up 04:06:43 - 04:26:44 -2151
Okanogan 04:16:49 -17.9 AT Up 41.3 225.2 Up 04:06:48 - 04:26:49 -2151
Brewster 04:16:49 -18.0 AT Up 41.6 225.1 Up 04:06:48 - 04:26:49 -2158
Toppenish/White Swan 04:16:58 -18.5 Dark Up 43.1 225.6 Up 04:06:58 - 04:26:59 -2163
Oliver 04:16:43 -17.5 AT Up 40.8 224.7 Up 04:06:43 - 04:26:44 -2167
Penticton 04:16:41 -17.3 AT Up 40.5 224.5 Up 04:06:40 - 04:26:41 -2175
Clarence Fulton 04:16:38 -17.1 AT Up 39.9 224.3 Up 04:06:38 - 04:26:39 -2176
Kelowna 04:16:38 -17.2 AT Up 40.2 224.4 Up 04:06:38 - 04:26:39 -2176
Manson/Chelan 04:16:50 -17.9 AT Up 41.9 224.9 Up 04:06:50 - 04:26:51 -2177
Yakima 04:16:57 -18.3 Dark Up 43.0 225.2 Up 04:06:57 - 04:26:58 -2178
Wenatchee 04:16:53 -18.0 Dark Up 42.3 225.0 Up 04:06:53 - 04:26:54 -2178
Redmond 04:17:10 -19.1 Dark Up 44.9 226.2 Up 04:07:09 - 04:27:10 -2178
Goldendale 04:17:02 -18.5 Dark Up 43.7 225.5 Up 04:07:02 - 04:27:03 -2181
Summerland 04:16:41 -17.2 AT Up 40.5 224.3 Up 04:06:40 - 04:26:41 -2183
Ellensburg 04:16:54 -18.1 Dark Up 42.7 225.0 Up 04:06:53 - 04:26:54 -2184
Bend 04:17:10 -19.1 Dark Up 45.2 226.2 Up 04:07:09 - 04:27:10 -2185
Maupin 04:17:06 -18.7 Dark Up 44.3 225.6 Up 04:07:06 - 04:27:07 -2187
Oregon Observatory 04:17:13 -19.1 Dark Up 45.3 226.2 Up 04:07:13 - 04:27:14 -2191
Klamath Falls 04:17:20 -19.7 Dark Up 46.6 227.0 Up 04:07:20 - 04:27:21 -2191
La Pine/Gilchrist 04:17:12 -19.2 Dark Up 45.5 226.2 Up 04:07:12 - 04:27:13 -2192
Peachland 04:16:40 -17.1 AT Up 40.4 224.1 Up 04:06:39 - 04:26:40 -2192
Chiloquin 04:17:19 -19.5 Dark Up 46.4 226.7 Up 04:07:18 - 04:27:19 -2201
The Dalles 04:17:02 -18.4 Dark Up 44.0 225.2 Up 04:07:01 - 04:27:02 -2201
Sisters 04:17:11 -18.8 Dark Up 45.1 225.7 Up 04:07:10 - 04:27:11 -2206
Victoria 04:16:44 -15.6 AT Up 43.0 220.5 Up 04:06:43 - 04:26:44 -2395

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 13MR18, (2025/09/08 04:21UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.7 +38:47:07  0.0 35.37  79
Rasalhague     17:34:56.3 +12:33:31  2.1  6.03  89
PPM 163642     17:11:45.3 +07:53:41  6.3  1.60  94
PPM 163827     17:20:00.1 +07:58:11  8.2  0.50  92
PPM 163795     17:18:25.4 +08:03:28  9.2  0.13  93
PPM 163783     17:18:04.2 +08:17:51 10.8  0.13  93
13MR18         17:18:07.7 +08:10:06 15.2        93
Positions are for J2000

Event circumstances last updated at 2021/11/12 22:11:05 UT

Marc W. Buie, Southwest Research Institute

RECON