RECON: TNO occultation with 471165

Event between (471165) 10HE79 and star GA0700:07716486 with event index number of 2264150

Geocentric closest approach at 2025/02/18 11:46:35 UTC

J2000 position of star is 17:03:38.2 -18:15:22
Equinox of date position of star is 17:05:00.6 -18:17:15
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 42 degrees from the moon. Moon is 71% illuminated.
Apparent brightness V=21.3

[RECON map]
Object is 38.3 AU from the Sun and 38.6 AU from the Earth.
Apparent velocity is 14.1 km/sec on the sky relative to the star, or, 1.8 arcsec/hr.
The 1-sigma error in the time of the event is 138 seconds.
The 1-sigma cross-track error in the shadow position is 1423 km.
The sky-plane scale is 27965.1 km/arcsec.

The object has an absolute magnitude Hv=5.3
Diameter=527.2 km assuming a 5% albedo -- 37.5 sec chord
Diameter=215.2 km assuming a 30% albedo -- 15.3 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 471165, (2025/02/18 11:46UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:57.2 -26:29:08  0.9 11.37  34
35Eta Oph      17:11:49.3 -15:45:15  2.6  3.00  44
29 Oph         17:03:19.6 -18:55:13  5.9  0.76  41
PPM 232561     17:05:54.8 -18:10:20  8.2  0.23  42
471165         17:05:06.3 -18:17:23 15.9        42
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 0.0 km RECON observability=0.2 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 11:44:51 -23.2 Dark Up 12.7 144.2 Really Low 11:32:50 - 11:56:52 12637
Kamloops 11:43:50 -32.3 Dark Up 7.5 131.3 Really Low 11:31:49 - 11:55:51 12475
Kelowna 11:43:48 -32.1 Dark Up 8.5 132.0 Really Low 11:31:47 - 11:55:49 12452
Peachland 11:43:48 -32.3 Dark Up 8.4 131.7 Really Low 11:31:47 - 11:55:49 12445
Summerland 11:43:46 -32.4 Dark Up 8.6 131.8 Really Low 11:31:45 - 11:55:47 12439
Penticton 11:43:47 -32.3 Dark Up 8.7 131.9 Really Low 11:31:46 - 11:55:48 12438
Oliver 11:43:45 -32.4 Dark Up 8.9 131.8 Really Low 11:31:44 - 11:55:46 12423
Anarchist Mountain Observatory 11:43:46 -32.4 Dark Up 9.1 132.0 Really Low 11:31:45 - 11:55:47 12419
Okanogan 11:43:40 -32.8 Dark Up 9.4 131.7 Really Low 11:31:39 - 11:55:41 12388
Brewster 11:43:39 -33.0 Dark Up 9.5 131.5 Really Low 11:31:38 - 11:55:40 12374
Manson/Chelan 11:43:36 -33.3 Dark Up 9.5 131.1 Really Low 11:31:35 - 11:55:37 12361
Victoria 11:43:28 -35.1 Dark Up 7.4 128.5 Really Low 11:31:27 - 11:55:29 12350
Wenatchee 11:43:33 -33.6 Dark Up 9.7 130.9 Really Low 11:31:32 - 11:55:34 12337
Ellensburg 11:43:30 -33.9 Dark Up 9.8 130.7 Really Low 11:31:29 - 11:55:31 12316
Yakima 11:43:25 -34.1 Dark Up 10.1 130.6 Really Low 11:31:24 - 11:55:26 12297
Toppenish/White Swan 11:43:28 -34.0 Dark Up 10.3 130.7 Really Low 11:31:27 - 11:55:29 12289
PNWRO 11:43:30 -33.2 Dark Up 11.3 131.9 Really Low 11:31:29 - 11:55:31 12289
The Dalles 11:43:19 -34.9 Dark Up 10.4 129.9 Really Low 11:31:18 - 11:55:20 12242
Maupin 11:43:19 -35.0 Dark Up 10.7 130.0 Really Low 11:31:18 - 11:55:20 12223
Sisters 11:43:12 -35.6 Dark Up 11.0 129.4 Really Low 11:31:11 - 11:55:13 12173
Bend 11:43:12 -35.5 Dark Up 11.3 129.6 Really Low 11:31:11 - 11:55:13 12165
Oregon Observatory 11:43:10 -35.7 Dark Up 11.3 129.5 Really Low 11:31:09 - 11:55:11 12154
Dunrhomin 11:44:08 -24.6 Dark Up 22.4 142.5 Low 11:32:07 - 11:56:09 12111
Nikitin 11:44:07 -24.6 Dark Up 22.6 142.4 Low 11:32:06 - 11:56:08 12100
CU-SBO 11:44:03 -24.7 Dark Up 22.6 142.3 Low 11:32:02 - 11:56:04 12096
Chiloquin 11:43:00 -36.4 Dark Up 11.9 128.9 Really Low 11:30:59 - 11:55:01 12079
Klamath Falls 11:43:00 -36.5 Dark Up 12.1 128.9 Really Low 11:30:59 - 11:55:01 12062
Cedarville 11:43:04 -35.6 Dark Up 13.5 130.0 Really Low 11:31:03 - 11:55:05 12045
Fall River/Burney 11:42:56 -36.6 Dark Up 13.1 129.0 Really Low 11:30:55 - 11:54:57 12002
Gimple 11:42:55 -36.5 Dark Up 14.0 129.2 Really Low 11:30:54 - 11:54:56 11957
Greenville 11:42:53 -36.6 Dark Up 13.9 129.1 Really Low 11:30:52 - 11:54:54 11956
Quincy 11:42:53 -36.7 Dark Up 14.0 129.1 Really Low 11:30:52 - 11:54:54 11944
Portola 11:42:54 -36.4 Dark Up 14.4 129.4 Really Low 11:30:53 - 11:54:55 11944
Reno 11:42:55 -35.9 Dark Up 15.0 129.9 Really Low 11:30:54 - 11:54:56 11937
Carson City 11:42:54 -36.0 Dark Up 15.2 129.8 Really Low 11:30:53 - 11:54:55 11916
Yerington 11:42:56 -35.6 Dark Up 15.7 130.3 Really Low 11:30:55 - 11:54:57 11912
Gardnerville 11:42:53 -36.1 Dark Up 15.4 129.8 Really Low 11:30:52 - 11:54:54 11902
Hawthorne 11:42:56 -35.3 Dark Up 16.3 130.6 Really Low 11:30:55 - 11:54:57 11891
Lee Vining 11:42:51 -35.9 Dark Up 16.4 130.1 Really Low 11:30:50 - 11:54:52 11852
Bishop 11:42:52 -35.4 Dark Up 17.2 130.5 Really Low 11:30:51 - 11:54:53 11824
Beatty 11:42:57 -34.3 Dark Up 18.5 131.7 Really Low 11:30:56 - 11:54:58 11815
Patrick 11:43:04 -32.2 Dark Up 21.3 133.6 Low 11:31:03 - 11:55:05 11753
Laughlin/Bullhead City 11:42:59 -32.8 Dark Up 21.0 132.9 Low 11:30:58 - 11:55:00 11729
Lake Havasu City 11:42:58 -32.7 Dark Up 21.6 132.9 Low 11:30:57 - 11:54:59 11689
George/Scottsdale 11:43:07 -30.8 Dark Up 23.6 134.7 Low 11:31:06 - 11:55:08 11663
Idyllwild 11:42:44 -34.9 Dark Up 20.6 130.8 Low 11:30:43 - 11:54:45 11612
Wildwood 11:42:36 -36.4 Dark Up 19.2 129.5 Really Low 11:30:35 - 11:54:37 11611
Calipatria 11:42:47 -34.0 Dark Up 21.8 131.5 Low 11:30:46 - 11:54:48 11584
Yuma 11:42:49 -33.3 Dark Up 22.6 132.1 Low 11:30:48 - 11:54:50 11565

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 471165, (2025/02/18 11:46UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 11.37  34
35Eta Oph      17:10:22.7 -15:43:29  2.6  3.00  44
29 Oph         17:01:51.2 -18:53:08  5.9  0.76  41
PPM 232561     17:04:26.8 -18:08:21  8.2  0.23  42
471165         17:03:38.2 -18:15:22 15.9        42
Positions are for J2000

Event circumstances last updated at 2023/07/04 04:25:03 UT

Marc W. Buie, Southwest Research Institute

RECON