RECON: TNO occultation with 523740

Event between (523740) 14TV85 and star GA0720:04894554 with event index number of 2324318

Geocentric closest approach at 2025/05/26 05:39:15 UTC

J2000 position of star is 12:44:07.0 -16:31:20
Equinox of date position of star is 12:45:24.0 -16:39:20
Stellar brightness G=14.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 144 degrees from the moon. Moon is 1% illuminated.
Apparent brightness V=21.4

[RECON map]
Object is 15.2 AU from the Sun and 14.5 AU from the Earth.
Apparent velocity is 12.3 km/sec on the sky relative to the star, or, 4.2 arcsec/hr.
The 1-sigma error in the time of the event is 49 seconds.
The 1-sigma cross-track error in the shadow position is 645 km.
The sky-plane scale is 10544.3 km/arcsec.

The object has an absolute magnitude Hv=9.4
Diameter=77.3 km assuming a 5% albedo -- 6.5 sec chord
Diameter=31.5 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 523740, (2025/05/26 05:39UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:32.1 -11:17:35  1.0 11.32 151
4Gam Crv       12:17:07.0 -17:40:58  2.6  6.84 138
PPM 226138     12:40:04.5 -18:23:22  6.0  2.15 143
PPM 226189     12:42:02.8 -16:17:09  8.5  0.90 143
PPM 226284     12:45:51.7 -16:37:27  9.3  0.11 144
523740         12:45:27.0 -16:39:39 14.7       144
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 4.8 km RECON observability=0.8 and success probability=0.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 05:43:01 -14.8 AT Down 15.7 212.7 Really Low 05:38:27 - 05:47:34 2623
Dunrhomin 05:41:52 -26.1 Dark Down 25.3 215.6 Low 05:37:18 - 05:46:25 2585
Nikitin 05:41:51 -26.3 Dark Down 25.5 215.7 Low 05:37:18 - 05:46:25 2581
CU-SBO 05:41:51 -26.3 Dark Down 25.6 215.6 Low 05:37:17 - 05:46:24 2577
George/Scottsdale 05:41:47 -29.9 Dark Down 33.7 211.1 Up 05:37:13 - 05:46:20 2117
Kelowna 05:43:44 -13.3 AT Down 21.4 200.1 Low 05:39:10 - 05:48:17 2074
Anarchist Mountain Observatory 05:43:40 -14.0 AT Down 22.2 200.3 Low 05:39:07 - 05:48:14 2070
Penticton 05:43:43 -13.5 AT Down 21.7 200.0 Low 05:39:10 - 05:48:17 2067
Summerland 05:43:44 -13.4 AT Down 21.7 199.9 Low 05:39:10 - 05:48:17 2062
Oliver 05:43:42 -13.8 AT Down 22.1 200.1 Low 05:39:08 - 05:48:15 2062
Patrick 05:42:07 -27.7 Dark Down 33.0 208.5 Up 05:37:33 - 05:46:40 2062
Peachland 05:43:45 -13.2 AT Down 21.6 199.8 Low 05:39:11 - 05:48:18 2060
Okanogan 05:43:38 -14.5 AT Down 22.9 200.2 Low 05:39:05 - 05:48:12 2051
PNWRO 05:43:25 -16.7 AT Down 24.9 201.2 Low 05:38:51 - 05:47:58 2048
Kamloops 05:43:51 -12.3 AT Down 20.8 199.1 Low 05:39:17 - 05:48:24 2043
Brewster 05:43:38 -14.6 AT Down 23.2 200.0 Low 05:39:04 - 05:48:11 2037
Manson/Chelan 05:43:38 -14.7 AT Down 23.4 199.7 Low 05:39:04 - 05:48:11 2017
Laughlin/Bullhead City 05:42:09 -27.6 Dark Down 33.5 207.9 Up 05:37:35 - 05:46:42 2016
Lake Havasu City 05:42:04 -28.3 Dark Down 34.0 208.3 Up 05:37:30 - 05:46:37 2010
Wenatchee 05:43:36 -15.0 AT Down 23.9 199.5 Low 05:39:03 - 05:48:10 2002
Ellensburg 05:43:36 -15.3 AT Down 24.4 199.4 Low 05:39:03 - 05:48:10 1985
Toppenish/White Swan 05:43:33 -15.9 AT Down 24.9 199.6 Low 05:39:00 - 05:48:07 1982
Yakima 05:43:34 -15.6 AT Down 24.8 199.4 Low 05:39:01 - 05:48:08 1977
Beatty 05:42:29 -25.2 Dark Down 32.7 205.1 Up 05:37:56 - 05:47:03 1951
Yuma 05:41:56 -29.7 Dark Down 35.7 208.6 Up 05:37:22 - 05:46:29 1935
The Dalles 05:43:33 -16.2 AT Down 25.8 198.9 Low 05:39:00 - 05:48:07 1929
Maupin 05:43:31 -16.6 AT Down 26.2 199.1 Low 05:38:57 - 05:48:04 1926
Calipatria 05:42:03 -28.9 Dark Down 35.7 207.5 Up 05:37:30 - 05:46:37 1900
Hawthorne 05:42:47 -23.1 Dark Down 31.8 202.8 Up 05:38:13 - 05:47:20 1897
Cedarville 05:43:10 -20.0 Dark Down 29.4 200.6 Low 05:38:36 - 05:47:43 1893
Bend 05:43:26 -17.4 AT Down 27.3 199.0 Low 05:38:53 - 05:48:00 1892
Sisters 05:43:29 -17.1 AT Down 27.2 198.7 Low 05:38:56 - 05:48:03 1884
Oregon Observatory 05:43:26 -17.5 AT Down 27.5 198.9 Low 05:38:52 - 05:47:59 1881
Yerington 05:42:52 -22.5 Dark Down 31.5 202.1 Up 05:38:18 - 05:47:25 1881
Bishop 05:42:40 -24.2 Dark Down 32.8 203.3 Up 05:38:06 - 05:47:13 1876
Victoria 05:43:54 -13.0 AT Down 23.5 196.3 Low 05:39:20 - 05:48:27 1873
Reno 05:42:58 -21.8 Dark Down 31.2 201.3 Up 05:38:25 - 05:47:32 1861
Idyllwild 05:42:13 -27.9 Dark Down 35.6 206.0 Up 05:37:39 - 05:46:46 1856
Lee Vining 05:42:47 -23.4 Dark Down 32.5 202.4 Up 05:38:13 - 05:47:20 1855
Carson City 05:42:57 -22.1 Dark Down 31.5 201.4 Up 05:38:23 - 05:47:30 1852
Gardnerville 05:42:54 -22.3 Dark Down 31.8 201.5 Up 05:38:21 - 05:47:28 1848
Portola 05:43:02 -21.3 Dark Down 31.1 200.6 Up 05:38:29 - 05:47:36 1833
Chiloquin 05:43:22 -18.4 Dark Down 28.9 198.7 Low 05:38:49 - 05:47:56 1830
Klamath Falls 05:43:21 -18.8 Dark Down 29.2 198.8 Low 05:38:48 - 05:47:55 1825
Gimple 05:43:06 -20.8 Dark Down 30.9 200.1 Up 05:38:32 - 05:47:39 1820
Greenville 05:43:06 -20.8 Dark Down 31.0 200.0 Up 05:38:32 - 05:47:39 1816
Fall River/Burney 05:43:13 -19.9 Dark Down 30.2 199.4 Up 05:38:40 - 05:47:47 1816
Quincy 05:43:06 -21.0 Dark Down 31.1 200.1 Up 05:38:33 - 05:47:40 1810
Wildwood 05:42:23 -26.8 Dark Down 35.9 203.9 Up 05:37:50 - 05:46:57 1761

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 523740, (2025/05/26 05:39UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 11.32 151
4Gam Crv       12:15:48.1 -17:32:30  2.6  6.84 138
PPM 226138     12:38:44.4 -18:15:00  6.0  2.15 143
PPM 226189     12:40:43.0 -16:08:49  8.5  0.90 143
PPM 226284     12:44:31.6 -16:29:07  9.3  0.11 144
523740         12:44:07.0 -16:31:20 14.7       144
Positions are for J2000

Event circumstances last updated at 2024/06/13 03:51:13 UT

Marc W. Buie, Southwest Research Institute

RECON