RECON: TNO occultation with 278361

Event between (278361) 07JJ43 and star GA0640:14675377 with event index number of 2181780

Geocentric closest approach at 2024/05/30 07:11:50 UTC

J2000 position of star is 17:23:49.6 -25:34:39
Equinox of date position of star is 17:25:19.2 -25:35:54
Stellar brightness G=14.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 72 degrees from the moon. Moon is 55% illuminated.
Apparent brightness V=20.6

[RECON map]
Object is 40.6 AU from the Sun and 39.6 AU from the Earth.
Apparent velocity is 23.7 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 273 seconds.
The 1-sigma cross-track error in the shadow position is 1803 km.
The sky-plane scale is 28756.6 km/arcsec.

The object has an absolute magnitude Hv=4.5
Diameter=758.6 km assuming a 5% albedo -- 32.2 sec chord
Diameter=309.7 km assuming a 30% albedo -- 13.1 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 

Star training set for 278361, (2024/05/30 07:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:54.5 -26:29:03  0.9 12.25  84
35Eta Oph      17:11:46.8 -15:45:12  2.6 10.34  76
PPM 266746     17:23:11.5 -24:55:43  6.5  0.83  72
PPM 266794     17:24:39.9 -25:07:08  7.6  0.50  72
PPM 266779     17:24:16.9 -25:34:45  9.0  0.24  72
278361         17:25:20.1 -25:35:55 14.9        71
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 3.3 sigma about the mid-time.
The median site spacing is 8.9 km RECON observability=0.5 and success probability=0.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 07:12:44 -16.0 AT Down 11.8 170.4 Really Low 06:57:44 - 07:27:44 5807
Kamloops 07:13:25 -16.8 AT Down 10.7 157.5 Really Low 06:58:25 - 07:28:25 5548
Kelowna 07:13:23 -17.7 AT Down 11.7 158.2 Really Low 06:58:23 - 07:28:23 5537
Peachland 07:13:24 -17.8 AT Down 11.7 157.9 Really Low 06:58:24 - 07:28:24 5528
Summerland 07:13:24 -17.9 AT Down 11.9 158.0 Really Low 06:58:24 - 07:28:24 5524
Penticton 07:13:25 -18.0 AT Down 11.9 158.1 Really Low 06:58:25 - 07:28:25 5524
Oliver 07:13:25 -18.3 Dark Down 12.3 158.1 Really Low 06:58:25 - 07:28:25 5511
Anarchist Mountain Observatory 07:13:25 -18.5 Dark Down 12.5 158.2 Really Low 06:58:25 - 07:28:25 5510
Okanogan 07:13:25 -19.1 Dark Down 13.0 158.0 Really Low 06:58:25 - 07:28:25 5481
Brewster 07:13:26 -19.4 Dark Down 13.2 157.8 Really Low 06:58:26 - 07:28:26 5468
Manson/Chelan 07:13:28 -19.5 Dark Down 13.3 157.4 Really Low 06:58:28 - 07:28:28 5453
Wenatchee 07:13:29 -20.0 Dark Down 13.7 157.2 Really Low 06:58:29 - 07:28:29 5431
Victoria 07:13:36 -18.5 Dark Down 11.9 154.7 Really Low 06:58:36 - 07:28:36 5411
Ellensburg 07:13:31 -20.4 Dark Down 14.0 157.0 Really Low 06:58:31 - 07:28:31 5411
PNWRO 07:13:28 -21.5 Dark Down 15.4 158.4 Really Low 06:58:28 - 07:28:28 5404
Yakima 07:13:31 -20.8 Dark Down 14.4 157.0 Really Low 06:58:31 - 07:28:31 5394
Toppenish/White Swan 07:13:30 -21.0 Dark Down 14.7 157.1 Really Low 06:58:30 - 07:28:30 5389
Dunrhomin 07:12:48 -27.8 Dark Down 23.6 170.5 Low 06:57:48 - 07:27:48 5386
Nikitin 07:12:47 -28.0 Dark Down 23.7 170.5 Low 06:57:47 - 07:27:47 5377
CU-SBO 07:12:48 -28.1 Dark Down 23.8 170.4 Low 06:57:48 - 07:27:48 5373
The Dalles 07:13:33 -21.6 Dark Down 15.2 156.3 Really Low 06:58:33 - 07:28:33 5340
Maupin 07:13:34 -22.1 Dark Down 15.6 156.4 Really Low 06:58:34 - 07:28:34 5325
Sisters 07:13:37 -22.9 Dark Down 16.2 155.8 Really Low 06:58:37 - 07:28:37 5276
Bend 07:13:36 -23.1 Dark Down 16.5 156.0 Really Low 06:58:36 - 07:28:36 5271
Oregon Observatory 07:13:37 -23.3 Dark Down 16.6 155.9 Really Low 06:58:37 - 07:28:37 5261
Chiloquin 07:13:40 -24.5 Dark Down 17.7 155.4 Really Low 06:58:40 - 07:28:40 5191
Cedarville 07:13:36 -25.8 Dark Down 19.2 156.7 Really Low 06:58:36 - 07:28:36 5178
Klamath Falls 07:13:40 -24.8 Dark Down 18.1 155.4 Really Low 06:58:40 - 07:28:40 5176
Fall River/Burney 07:13:40 -26.1 Dark Down 19.3 155.6 Really Low 06:58:40 - 07:28:40 5127
Gimple 07:13:40 -27.0 Dark Down 20.2 155.9 Low 06:58:40 - 07:28:40 5093
Greenville 07:13:40 -27.0 Dark Down 20.2 155.8 Low 06:58:40 - 07:28:40 5091
Reno 07:13:37 -27.8 Dark Down 21.1 156.8 Low 06:58:37 - 07:28:37 5086
Portola 07:13:39 -27.4 Dark Down 20.7 156.2 Low 06:58:39 - 07:28:39 5086
Quincy 07:13:40 -27.2 Dark Down 20.4 155.8 Low 06:58:40 - 07:28:40 5081
Yerington 07:13:35 -28.4 Dark Down 21.8 157.3 Low 06:58:35 - 07:28:35 5072
Carson City 07:13:37 -28.1 Dark Down 21.4 156.7 Low 06:58:37 - 07:28:37 5068
Hawthorne 07:13:34 -28.9 Dark Down 22.4 157.7 Low 06:58:34 - 07:28:34 5059
Gardnerville 07:13:37 -28.4 Dark Down 21.7 156.7 Low 06:58:37 - 07:28:37 5056
Lee Vining 07:13:37 -29.4 Dark Down 22.8 157.2 Low 06:58:37 - 07:28:37 5019
Beatty 07:13:29 -30.8 Dark Down 24.5 159.2 Low 06:58:29 - 07:28:29 5011
Bishop 07:13:34 -30.1 Dark Down 23.5 157.7 Low 06:58:34 - 07:28:34 5001
Patrick 07:13:21 -32.5 Dark Down 26.6 161.6 Low 06:58:21 - 07:28:21 4988
Laughlin/Bullhead City 07:13:23 -32.7 Dark Down 26.7 160.9 Low 06:58:23 - 07:28:23 4959
George/Scottsdale 07:13:14 -34.4 Dark Down 28.7 163.3 Low 06:58:14 - 07:28:14 4929
Lake Havasu City 07:13:23 -33.4 Dark Down 27.4 161.1 Low 06:58:23 - 07:28:23 4925
Idyllwild 07:13:31 -33.9 Dark Down 27.4 158.7 Low 06:58:31 - 07:28:31 4830
Calipatria 07:13:27 -34.7 Dark Down 28.3 159.7 Low 06:58:27 - 07:28:27 4818
Yuma 07:13:25 -35.2 Dark Down 29.0 160.4 Low 06:58:25 - 07:28:25 4811
Wildwood 07:13:38 -33.3 Dark Down 26.5 157.0 Low 06:58:38 - 07:28:38 4808

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 278361, (2024/05/30 07:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 12.25  84
35Eta Oph      17:10:22.7 -15:43:29  2.6 10.34  76
PPM 266746     17:21:41.5 -24:54:23  6.5  0.83  72
PPM 266794     17:23:09.7 -25:05:51  7.6  0.50  72
PPM 266779     17:22:46.4 -25:33:27  9.0  0.24  72
278361         17:23:49.6 -25:34:39 14.9        72
Positions are for J2000

Event circumstances last updated at 2024/03/02 05:48:36 UT

Marc W. Buie, Southwest Research Institute

RECON