RECON: TNO occultation with 525816

Event between (525816) 05SF278 and star GA1040:00550616 with event index number of 2167463

Geocentric closest approach at 2028/03/23 04:40:00 UTC

J2000 position of star is 04:39:54.2 +15:30:16
Equinox of date position of star is 04:41:13.3 +15:32:53
Stellar brightness G=15.8, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 101 degrees from the moon. Moon is 8% illuminated.
Apparent brightness V=22.4

[RECON map]
Object is 35.6 AU from the Sun and 36.0 AU from the Earth.
Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 2.3 arcsec/hr.
The 1-sigma error in the time of the event is 127 seconds.
The 1-sigma cross-track error in the shadow position is 1845 km.
The sky-plane scale is 26080.1 km/arcsec.

The object has an absolute magnitude Hv=6.7
Diameter=279.3 km assuming a 5% albedo -- 16.4 sec chord
Diameter=114.0 km assuming a 30% albedo -- 6.7 sec chord
Dynamical classification is 7:4EEE
 
 
 
 
 
 

Star training set for 525816, (2028/03/23 04:33UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:32.6 +16:33:50  0.8  1.39 100
Bellatrix      05:26:38.8 +06:22:22  1.6 14.38 111
91Sig1Tau      04:40:46.1 +15:51:12  5.3  0.35 100
PPM 120087     04:39:08.5 +15:12:03  8.0  0.67 100
PPM 120103     04:40:35.0 +15:37:29  9.8  0.23 100
525816         04:41:30.9 +15:33:27 15.8       101
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 38.8 km RECON observability=0.9 and success probability=4.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 04:45:19 -28.6 Dark Down 20.4 269.3 Low 04:34:13 - 04:56:24 -4295
Kamloops 04:44:57 -22.6 Dark Down 29.5 258.1 Low 04:33:52 - 04:56:03 -4531
Kelowna 04:45:01 -23.5 Dark Down 29.1 259.3 Low 04:33:55 - 04:56:06 -4612
Peachland 04:45:00 -23.4 Dark Down 29.3 259.1 Low 04:33:55 - 04:56:06 -4624
Summerland 04:45:01 -23.6 Dark Down 29.3 259.3 Low 04:33:55 - 04:56:06 -4639
Penticton 04:44:59 -23.7 Dark Down 29.2 259.4 Low 04:33:54 - 04:56:05 -4645
Oliver 04:45:02 -23.9 Dark Down 29.3 259.6 Low 04:33:57 - 04:56:08 -4682
Anarchist Mountain Observatory 04:45:03 -24.1 Dark Down 29.2 259.9 Low 04:33:57 - 04:56:08 -4698
Victoria 04:44:54 -22.0 Dark Down 31.9 256.8 Up 04:33:48 - 04:55:59 -4758
Okanogan 04:45:03 -24.3 Dark Down 29.4 260.1 Low 04:33:57 - 04:56:08 -4766
Brewster 04:45:04 -24.3 Dark Down 29.6 260.0 Low 04:33:59 - 04:56:10 -4795
Manson/Chelan 04:45:03 -24.2 Dark Down 29.9 259.9 Low 04:33:57 - 04:56:08 -4817
Wenatchee 04:45:03 -24.4 Dark Down 30.1 260.0 Up 04:33:58 - 04:56:09 -4867
Ellensburg 04:45:04 -24.5 Dark Down 30.3 260.1 Up 04:33:58 - 04:56:09 -4911
Yakima 04:45:05 -24.7 Dark Down 30.4 260.3 Up 04:34:00 - 04:56:11 -4954
Toppenish/White Swan 04:45:05 -24.9 Dark Down 30.3 260.5 Up 04:34:00 - 04:56:11 -4976
PNWRO 04:45:11 -26.0 Dark Down 29.3 261.9 Low 04:34:05 - 04:56:16 -5010
The Dalles 04:45:06 -24.8 Dark Down 31.0 260.4 Up 04:34:00 - 04:56:11 -5060
Maupin 04:45:06 -25.1 Dark Down 31.0 260.7 Up 04:34:00 - 04:56:11 -5104
Sisters 04:45:07 -25.2 Dark Down 31.5 260.9 Up 04:34:02 - 04:56:13 -5198
Bend 04:45:08 -25.5 Dark Down 31.3 261.2 Up 04:34:02 - 04:56:13 -5222
Oregon Observatory 04:45:06 -25.5 Dark Down 31.4 261.2 Up 04:34:01 - 04:56:12 -5241
Chiloquin 04:45:08 -25.9 Dark Down 31.9 261.7 Up 04:34:02 - 04:56:13 -5383
Klamath Falls 04:45:09 -26.1 Dark Down 31.9 262.0 Up 04:34:03 - 04:56:14 -5419
Cedarville 04:45:16 -27.5 Dark Down 30.8 263.6 Up 04:34:10 - 04:56:21 -5490
Dunrhomin 04:45:50 -37.5 Dark Down 19.4 274.2 Really Low 04:34:44 - 04:56:55 -5501
Nikitin 04:45:50 -37.6 Dark Down 19.4 274.3 Really Low 04:34:45 - 04:56:56 -5521
CU-SBO 04:45:50 -37.6 Dark Down 19.4 274.2 Really Low 04:34:45 - 04:56:56 -5529
Fall River/Burney 04:45:13 -26.9 Dark Down 31.8 263.0 Up 04:34:08 - 04:56:19 -5545
Greenville 04:45:13 -27.7 Dark Down 31.5 263.9 Up 04:34:08 - 04:56:19 -5642
Gimple 04:45:14 -27.7 Dark Down 31.5 263.9 Up 04:34:08 - 04:56:19 -5642
Quincy 04:45:16 -27.8 Dark Down 31.5 264.0 Up 04:34:11 - 04:56:22 -5664
Portola 04:45:16 -28.2 Dark Down 31.2 264.4 Up 04:34:10 - 04:56:21 -5676
Reno 04:45:20 -28.7 Dark Down 30.7 265.0 Up 04:34:14 - 04:56:25 -5703
Carson City 04:45:20 -28.9 Dark Down 30.7 265.2 Up 04:34:15 - 04:56:26 -5741
Yerington 04:45:21 -29.5 Dark Down 30.2 265.8 Up 04:34:15 - 04:56:26 -5760
Gardnerville 04:45:20 -29.1 Dark Down 30.7 265.4 Up 04:34:15 - 04:56:26 -5768
Hawthorne 04:45:24 -30.1 Dark Down 29.8 266.4 Low 04:34:19 - 04:56:30 -5808
Lee Vining 04:45:24 -30.0 Dark Down 30.3 266.4 Up 04:34:18 - 04:56:29 -5872
Bishop 04:45:24 -30.8 Dark Down 29.7 267.2 Low 04:34:19 - 04:56:30 -5934
Beatty 04:45:31 -32.2 Dark Down 28.4 268.5 Low 04:34:26 - 04:56:37 -5976
Patrick 04:45:40 -35.0 Dark Down 26.0 271.0 Low 04:34:35 - 04:56:46 -6118
Laughlin/Bullhead City 04:45:39 -34.6 Dark Down 26.6 270.7 Low 04:34:33 - 04:56:44 -6150
Lake Havasu City 04:45:40 -35.1 Dark Down 26.4 271.2 Low 04:34:35 - 04:56:46 -6222
George/Scottsdale 04:45:46 -37.3 Dark Down 24.3 272.9 Low 04:34:41 - 04:56:52 -6285
Wildwood 04:45:28 -32.2 Dark Down 30.0 269.0 Low 04:34:22 - 04:56:33 -6293
Idyllwild 04:45:34 -33.8 Dark Down 28.4 270.3 Low 04:34:29 - 04:56:40 -6322
Calipatria 04:45:37 -34.9 Dark Down 27.4 271.2 Low 04:34:31 - 04:56:42 -6381
Yuma 04:45:40 -35.8 Dark Down 26.6 271.9 Low 04:34:34 - 04:56:45 -6422

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 525816, (2028/03/23 04:33UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  1.39 100
Bellatrix      05:25:07.8 +06:20:58  1.6 14.38 111
91Sig1Tau      04:39:09.2 +15:47:58  5.3  0.35 100
PPM 120087     04:37:32.1 +15:08:46  8.0  0.67 100
PPM 120103     04:38:58.3 +15:34:15  9.8  0.23 100
525816         04:39:54.2 +15:30:16 15.8       101
Positions are for J2000

Event circumstances last updated at 2023/02/07 03:47:15 UT

Marc W. Buie, Southwest Research Institute

RECON