RECON: TNO occultation with 13MR18

Event between 13MR18 and star GA0980:04817942 with event index number of 2068959

Geocentric closest approach at 2025/08/01 08:21:03 UTC

J2000 position of star is 17:19:00.3 +08:49:37
Equinox of date position of star is 17:20:03.1 +08:48:20
Stellar brightness G=14.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 53 degrees from the moon. Moon is 48% illuminated.
TNO apparent brightness V=22.3

[RECON map]
TNO is 26.6 AU from the Sun and 26.1 AU from the Earth.
The TNO is moving 16.8 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 186 seconds.
The 1-sigma cross-track error in the shadow position is 2115 km.
The sky-plane scale is 18901.8 km/arcsec.

The TNO has an absolute magnitude Hv=7.9
Diameter=158.5 km assuming a 5% albedo -- 9.4 sec chord
Diameter=64.7 km assuming a 30% albedo -- 3.8 sec chord
Dynamical classification is 3:2E+6:4II
 
 
 
 
 
 

Star training set for 13MR18, (2025/08/01 08:21UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:48.3 +38:48:31  0.0 34.69  83
Rasalhague     17:36:07.4 +12:32:37  2.1  5.41  58
PPM 163642     17:12:59.3 +07:51:56  6.3  2.02  51
PPM 163833     17:21:24.7 +09:26:06  8.4  0.70  53
PPM 163782     17:19:10.9 +09:07:26 10.0  0.41  53
PPM 163813     17:20:29.6 +08:48:07 10.2  0.07  53
13MR18         17:20:13.7 +08:48:07 14.8        53
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 26.7 km RECON observability=1.0 and success probability=8.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Clarence Fulton 08:15:37 -21.8 Dark Down 28.7 247.4 Low 08:00:37 - 08:30:37 -3579
Kelowna 08:15:39 -22.2 Dark Down 28.9 247.5 Low 08:00:39 - 08:30:39 -3616
Peachland 08:15:39 -22.3 Dark Down 29.1 247.2 Low 08:00:39 - 08:30:39 -3622
Summerland 08:15:39 -22.4 Dark Down 29.1 247.4 Low 08:00:39 - 08:30:39 -3639
Penticton 08:15:38 -22.5 Dark Down 29.1 247.5 Low 08:00:38 - 08:30:38 -3648
Victoria 08:15:48 -23.6 Dark Down 31.8 244.6 Up 08:00:48 - 08:30:48 -3668
Oliver 08:15:39 -22.9 Dark Down 29.2 247.7 Low 08:00:39 - 08:30:39 -3685
Anarchist Mountain Observatory 08:15:39 -23.0 Dark Down 29.2 248.0 Low 08:00:39 - 08:30:39 -3707
Tonasket 08:15:38 -23.3 Dark Down 29.3 248.1 Low 08:00:38 - 08:30:38 -3738
Okanogan 08:15:39 -23.7 Dark Down 29.6 248.1 Low 08:00:39 - 08:30:39 -3770
Brewster 08:15:41 -24.0 Dark Down 29.8 248.1 Low 08:00:41 - 08:30:41 -3795
Manson/Chelan 08:15:40 -24.2 Dark Down 30.1 247.9 Up 08:00:40 - 08:30:40 -3808
Wenatchee 08:15:42 -24.7 Dark Down 30.4 248.0 Up 08:00:42 - 08:30:42 -3855
Ellensburg 08:15:41 -25.1 Dark Down 30.7 248.0 Up 08:00:41 - 08:30:41 -3893
Yakima 08:15:41 -25.5 Dark Down 30.8 248.2 Up 08:00:41 - 08:30:41 -3935
Toppenish/White Swan 08:15:40 -25.7 Dark Down 30.8 248.5 Up 08:00:40 - 08:30:40 -3962
Pasco 08:15:37 -25.8 Dark Down 30.0 249.7 Up 08:00:37 - 08:30:37 -4003
Goldendale 08:15:43 -26.3 Dark Down 31.3 248.4 Up 08:00:43 - 08:30:43 -4010
The Dalles 08:15:43 -26.5 Dark Down 31.6 248.2 Up 08:00:43 - 08:30:43 -4025
PNWRO 08:15:37 -26.0 Dark Down 30.0 250.0 Low 08:00:37 - 08:30:37 -4034
Maupin 08:15:43 -26.9 Dark Down 31.7 248.6 Up 08:00:43 - 08:30:43 -4072
Sisters 08:15:44 -27.8 Dark Down 32.3 248.7 Up 08:00:44 - 08:30:44 -4153
Redmond 08:15:43 -27.8 Dark Down 32.1 249.0 Up 08:00:43 - 08:30:43 -4165
Bend 08:15:44 -28.0 Dark Down 32.2 249.0 Up 08:00:44 - 08:30:44 -4184
Oregon Observatory 08:15:44 -28.2 Dark Down 32.4 249.0 Up 08:00:44 - 08:30:44 -4199
La Pine/Gilchrist 08:15:45 -28.4 Dark Down 32.5 249.1 Up 08:00:45 - 08:30:45 -4219
North Lake 08:15:43 -28.8 Dark Down 32.2 249.9 Up 08:00:43 - 08:30:43 -4280
Chiloquin 08:15:47 -29.5 Dark Down 33.1 249.5 Up 08:00:47 - 08:30:47 -4328
Paisley 08:15:44 -29.4 Dark Down 32.2 250.5 Up 08:00:44 - 08:30:44 -4347
Klamath Falls 08:15:46 -29.9 Dark Down 33.2 249.7 Up 08:00:46 - 08:30:46 -4366
Lakeview 08:15:43 -29.9 Dark Down 32.2 250.9 Up 08:00:43 - 08:30:43 -4406
Cedarville 08:15:43 -30.5 Dark Down 32.3 251.5 Up 08:00:43 - 08:30:43 -4479
Fall River/Burney 08:15:47 -31.0 Dark Down 33.3 250.8 Up 08:00:47 - 08:30:47 -4500
Susanville 08:15:45 -31.6 Dark Down 33.0 251.8 Up 08:00:45 - 08:30:45 -4586
Greenville 08:15:46 -31.9 Dark Down 33.3 251.7 Up 08:00:46 - 08:30:46 -4607
Gimple 08:15:45 -31.9 Dark Down 33.2 251.8 Up 08:00:45 - 08:30:45 -4610
Quincy 08:15:47 -32.1 Dark Down 33.4 251.9 Up 08:00:47 - 08:30:47 -4629
Portola 08:15:44 -32.2 Dark Down 33.1 252.3 Up 08:00:44 - 08:30:44 -4654
Reno 08:15:43 -32.5 Dark Down 32.7 253.0 Up 08:00:43 - 08:30:43 -4699
Carson City 08:15:44 -32.9 Dark Down 32.7 253.2 Up 08:00:44 - 08:30:44 -4738
Gardnerville 08:15:44 -33.1 Dark Down 32.8 253.4 Up 08:00:44 - 08:30:44 -4765
Yerington 08:15:43 -33.0 Dark Down 32.3 253.8 Up 08:00:43 - 08:30:43 -4774
Hawthorne 08:15:41 -33.5 Dark Down 32.1 254.5 Up 08:00:41 - 08:30:41 -4836
Lee Vining 08:15:43 -34.0 Dark Down 32.6 254.5 Up 08:00:43 - 08:30:43 -4885
Dunrhomin 08:15:11 -29.7 Dark Down 21.6 263.1 Low 08:00:11 - 08:30:11 -4886
Tonopah 08:15:38 -33.8 Dark Down 31.1 255.8 Up 08:00:38 - 08:30:38 -4920
Bishop 08:15:42 -34.6 Dark Down 32.2 255.4 Up 08:00:42 - 08:30:42 -4966
Beatty 08:15:37 -34.9 Dark Down 31.0 256.8 Up 08:00:37 - 08:30:37 -5054
Indian Springs 08:15:36 -35.2 Dark Down 30.3 257.8 Up 08:00:36 - 08:30:36 -5113
CPSLO 08:15:50 -36.8 Dark Down 34.4 255.1 Up 08:00:50 - 08:30:50 -5127
Henderson 08:15:36 -35.6 Dark Down 29.8 258.6 Low 08:00:36 - 08:30:36 -5186
Patrick 08:15:32 -36.1 Dark Down 29.1 259.6 Low 08:00:32 - 08:30:32 -5277
Laughlin/Bullhead City 08:15:34 -36.4 Dark Down 29.7 259.3 Low 08:00:34 - 08:30:34 -5288
Kingman/Dolan Springs 08:15:36 -36.3 Dark Down 29.3 259.6 Low 08:00:36 - 08:30:36 -5297
Wildwood 08:15:47 -37.9 Dark Down 33.1 257.3 Up 08:00:47 - 08:30:47 -5309
Mohave Valley 08:15:36 -36.7 Dark Down 29.7 259.5 Low 08:00:36 - 08:30:36 -5318
Lake Havasu City 08:15:34 -37.0 Dark Down 29.6 259.9 Low 08:00:34 - 08:30:34 -5366
Idyllwild 08:15:42 -38.1 Dark Down 31.7 258.8 Up 08:00:42 - 08:30:42 -5394
Parker 08:15:36 -37.4 Dark Down 29.6 260.1 Low 08:00:36 - 08:30:36 -5405
Blythe 08:15:36 -37.9 Dark Down 30.0 260.2 Low 08:00:36 - 08:30:36 -5454
Calipatria 08:15:43 -38.5 Dark Down 30.8 259.9 Up 08:00:43 - 08:30:43 -5487
George/Scottsdale 08:15:29 -37.4 Dark Down 27.7 261.8 Low 08:00:29 - 08:30:29 -5499
Yuma 08:15:38 -38.9 Dark Down 30.1 260.7 Up 08:00:38 - 08:30:38 -5553

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, (2025/08/01 08:21UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.7 +38:47:07  0.0 34.69  83
Rasalhague     17:34:56.3 +12:33:31  2.1  5.41  58
PPM 163642     17:11:45.3 +07:53:41  6.3  2.02  51
PPM 163833     17:20:11.6 +09:27:33  8.4  0.70  53
PPM 163782     17:17:57.7 +09:08:58 10.0  0.41  53
PPM 163813     17:19:16.2 +08:49:36 10.2  0.07  53
13MR18         17:19:00.3 +08:49:37 14.8        53
Positions are for J2000

Event circumstances last updated at 2021/11/12 00:20:25 UT

Marc W. Buie, Southwest Research Institute

RECON