RECON: TNO occultation with 50000

Event between (50000) Quaoar and star GA0740:22190371 with event index number of 2326964

Geocentric closest approach at 2025/06/25 06:55:57 UTC

J2000 position of star is 18:41:28.6 -14:53:33
Equinox of date position of star is 18:42:43.5 -14:52:13
Stellar brightness G=14.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 165 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=18.8

[RECON map]
TNO is 42.6 AU from the Sun and 41.6 AU from the Earth.
The TNO is moving 24.5 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 100 seconds.
The 1-sigma cross-track error in the shadow position is 1528 km.
The sky-plane scale is 30203.2 km/arcsec.

The TNO has an absolute magnitude Hv=2.5
Diameter=1905.5 km assuming a 5% albedo -- 77.7 sec chord
Diameter=777.9 km assuming a 30% albedo -- 31.7 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 50000, (2025/06/25 06:55UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.4 -26:29:11  0.9 32.86 158
Nunki          18:56:50.6 -26:15:46  2.0 11.85 169
PPM 234707     18:35:06.4 -14:49:57  6.1  1.89 165
PPM 234902     18:43:09.5 -14:32:17  6.6  0.33 164
PPM 234882     18:42:26.3 -14:51:49  8.9  0.12 165
50000          18:42:55.9 -14:52:00 14.9       164
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 15.6 km RECON observability=1.0 and success probability=15.3%
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 06:56:47 -15.1 AT Down 22.1 157.2 Low 06:47:55 - 07:05:39 -962
Kelowna 06:56:48 -15.4 AT Down 22.4 157.0 Low 06:47:56 - 07:05:40 -981
Peachland 06:56:49 -15.5 AT Down 22.4 156.7 Low 06:47:57 - 07:05:41 -987
Summerland 06:56:49 -15.6 AT Down 22.6 156.7 Low 06:47:57 - 07:05:41 -994
Penticton 06:56:49 -15.7 AT Down 22.7 156.8 Low 06:47:57 - 07:05:41 -996
Oliver 06:56:49 -16.0 AT Down 23.0 156.8 Low 06:47:57 - 07:05:41 -1013
Anarchist Mountain Observatory 06:56:49 -16.2 AT Down 23.2 157.0 Low 06:47:57 - 07:05:41 -1020
Tonasket 06:56:49 -16.5 AT Down 23.5 156.8 Low 06:47:57 - 07:05:41 -1036
Okanogan 06:56:51 -16.8 AT Down 23.8 156.6 Low 06:47:59 - 07:05:43 -1054
Victoria 06:57:01 -15.9 AT Down 22.5 152.8 Low 06:48:09 - 07:05:53 -1061
Brewster 06:56:51 -17.1 AT Down 24.0 156.4 Low 06:47:59 - 07:05:43 -1068
Manson/Chelan 06:56:53 -17.2 AT Down 24.1 156.0 Low 06:48:01 - 07:05:45 -1080
Wenatchee 06:56:54 -17.6 AT Down 24.4 155.7 Low 06:48:02 - 07:05:46 -1105
Ellensburg 06:56:55 -18.0 AT Down 24.8 155.4 Low 06:48:03 - 07:05:47 -1127
Yakima 06:56:56 -18.4 Dark Down 25.1 155.3 Low 06:48:04 - 07:05:48 -1148
Toppenish/White Swan 06:56:55 -18.6 Dark Down 25.4 155.5 Low 06:48:03 - 07:05:47 -1159
Pasco 06:56:52 -19.0 Dark Down 25.8 156.7 Low 06:48:00 - 07:05:44 -1161
PNWRO 06:56:52 -19.2 Dark Down 26.1 156.9 Low 06:48:00 - 07:05:44 -1173
Goldendale 06:56:58 -19.0 Dark Down 25.7 154.9 Low 06:48:06 - 07:05:50 -1190
The Dalles 06:56:59 -19.2 Dark Down 25.8 154.5 Low 06:48:07 - 07:05:51 -1204
Maupin 06:56:59 -19.6 Dark Down 26.3 154.5 Low 06:48:07 - 07:05:51 -1227
Redmond 06:57:01 -20.5 Dark Down 27.0 154.2 Low 06:48:09 - 07:05:53 -1278
Sisters 06:57:02 -20.4 Dark Down 26.9 153.8 Low 06:48:10 - 07:05:54 -1278
Bend 06:57:02 -20.6 Dark Down 27.2 154.0 Low 06:48:10 - 07:05:54 -1290
Oregon Observatory 06:57:02 -20.8 Dark Down 27.3 153.9 Low 06:48:10 - 07:05:54 -1301
La Pine/Gilchrist 06:57:02 -21.0 Dark Down 27.5 153.8 Low 06:48:10 - 07:05:54 -1313
North Lake 06:57:01 -21.5 Dark Down 28.1 154.3 Low 06:48:09 - 07:05:53 -1335
Paisley 06:57:01 -22.1 Dark Down 28.7 154.5 Low 06:48:09 - 07:05:53 -1366
Chiloquin 06:57:05 -21.9 Dark Down 28.4 153.1 Low 06:48:13 - 07:05:57 -1380
Lakeview 06:57:01 -22.6 Dark Down 29.2 154.6 Low 06:48:09 - 07:05:53 -1396
Klamath Falls 06:57:05 -22.3 Dark Down 28.7 153.1 Low 06:48:13 - 07:05:57 -1400
Cedarville 06:57:01 -23.3 Dark Down 29.8 154.6 Low 06:48:09 - 07:05:53 -1435
Fall River/Burney 06:57:06 -23.5 Dark Down 29.9 153.3 Low 06:48:14 - 07:05:58 -1470
Dunrhomin 06:56:13 -26.3 Dark Down 34.4 170.9 Up 06:47:21 - 07:05:05 -1495
Susanville 06:57:04 -24.3 Dark Down 30.7 153.9 Up 06:48:12 - 07:05:56 -1506
Gimple 06:57:05 -24.5 Dark Down 30.9 153.6 Up 06:48:13 - 07:05:57 -1525
Greenville 06:57:05 -24.5 Dark Down 30.8 153.5 Up 06:48:13 - 07:05:57 -1525
Quincy 06:57:06 -24.7 Dark Down 31.0 153.4 Up 06:48:14 - 07:05:58 -1538
Portola 06:57:04 -24.9 Dark Down 31.3 153.9 Up 06:48:12 - 07:05:56 -1544
Reno 06:57:03 -25.3 Dark Down 31.7 154.5 Up 06:48:11 - 07:05:55 -1558
Carson City 06:57:03 -25.6 Dark Down 32.1 154.4 Up 06:48:11 - 07:05:55 -1581
Yerington 06:57:01 -25.9 Dark Down 32.5 155.1 Up 06:48:09 - 07:05:53 -1592
Gardnerville 06:57:04 -25.9 Dark Down 32.3 154.4 Up 06:48:12 - 07:05:56 -1597
Hawthorne 06:57:00 -26.5 Dark Down 33.1 155.5 Up 06:48:08 - 07:05:52 -1620
Tonopah 06:56:56 -27.2 Dark Down 33.9 156.9 Up 06:48:04 - 07:05:48 -1646
Lee Vining 06:57:03 -26.9 Dark Down 33.4 154.8 Up 06:48:11 - 07:05:55 -1659
Bishop 06:57:01 -27.7 Dark Down 34.2 155.4 Up 06:48:09 - 07:05:53 -1697
Beatty 06:56:56 -28.4 Dark Down 35.1 157.1 Up 06:48:04 - 07:05:48 -1723
Indian Springs 06:56:52 -29.0 Dark Down 35.8 158.2 Up 06:48:00 - 07:05:44 -1743
Henderson 06:56:51 -29.6 Dark Down 36.5 158.9 Up 06:47:59 - 07:05:43 -1778
Patrick 06:56:47 -30.4 Dark Down 37.4 160.0 Up 06:47:55 - 07:05:39 -1820
Kingman/Dolan Springs 06:56:48 -30.6 Dark Down 37.5 159.7 Up 06:47:56 - 07:05:40 -1836
Laughlin/Bullhead City 06:56:50 -30.5 Dark Down 37.4 159.1 Up 06:47:58 - 07:05:42 -1839
CPSLO 06:57:10 -29.1 Dark Down 35.2 152.4 Up 06:48:18 - 07:06:02 -1850
Mohave Valley 06:56:50 -30.8 Dark Down 37.6 159.0 Up 06:47:58 - 07:05:42 -1858
Lake Havasu City 06:56:49 -31.2 Dark Down 38.1 159.2 Up 06:47:57 - 07:05:41 -1886
Parker 06:56:50 -31.6 Dark Down 38.4 159.1 Up 06:47:58 - 07:05:42 -1912
Wildwood 06:57:05 -30.8 Dark Down 37.1 154.2 Up 06:48:13 - 07:05:57 -1928
George/Scottsdale 06:56:42 -32.4 Dark Down 39.5 161.9 Up 06:47:50 - 07:05:34 -1939
Idyllwild 06:56:59 -31.5 Dark Down 38.1 156.2 Up 06:48:07 - 07:05:51 -1947
Blythe 06:56:51 -32.0 Dark Down 38.8 158.6 Up 06:47:59 - 07:05:43 -1951
Calipatria 06:56:55 -32.4 Dark Down 39.0 157.4 Up 06:48:03 - 07:05:47 -1989
Yuma 06:56:53 -32.9 Dark Down 39.7 158.3 Up 06:48:01 - 07:05:45 -2019

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 50000, (2025/06/25 06:55UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 32.86 158
Nunki          18:55:15.9 -26:17:49  2.0 11.85 169
PPM 234707     18:33:39.1 -14:51:14  6.1  1.89 165
PPM 234902     18:41:42.5 -14:33:51  6.6  0.33 164
PPM 234882     18:40:59.1 -14:53:21  8.9  0.12 165
50000          18:41:28.6 -14:53:33 14.9       165
Positions are for J2000

Event circumstances last updated at 2021/11/11 00:04:04 UT

Marc W. Buie, Southwest Research Institute

RECON