RECON: TNO occultation with 500877

Event between (500877) 13JE64 and star GA0700:08851792 with event index number of 2332484

Geocentric closest approach at 2026/06/18 05:25:17 UTC

J2000 position of star is 17:14:39.8 -19:01:35
Equinox of date position of star is 17:16:06.1 -19:03:09
Stellar brightness G=15.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 129 degrees from the moon. Moon is 14% illuminated.
Apparent brightness V=24.2

[RECON map]
Object is 38.9 AU from the Sun and 37.9 AU from the Earth.
Apparent velocity is 24.1 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 454 seconds.
The 1-sigma cross-track error in the shadow position is 2788 km.
The sky-plane scale is 27455.8 km/arcsec.

The object has an absolute magnitude Hv=8.3
Diameter=138.0 km assuming a 5% albedo -- 5.4 sec chord
Diameter=56.4 km assuming a 30% albedo -- 2.2 sec chord
Dynamical classification is 2:1E
 
 
 
 
 
 

Star training set for 500877, (2026/06/18 05:25UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:02.1 -26:29:18  0.9 12.79 119
35Eta Oph      17:11:53.9 -15:45:21  2.6  3.46 127
PPM 232651     17:09:47.2 -17:38:30  6.0  2.08 127
PPM 232790     17:15:10.2 -18:33:56  8.5  0.55 128
PPM 232810     17:15:58.9 -19:02:24  9.4  0.06 128
500877         17:16:13.1 -19:03:17 15.5       129
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 2.0 sigma about the mid-time.
The median site spacing is 16.1 km RECON observability=0.5 and success probability=0.2%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 05:26:14 -11.5 NT Up 17.4 163.6 Really Low 05:11:14 - 05:41:14 10325
Kamloops 05:26:52 -8.3 NT Up 15.2 149.9 Really Low 05:11:52 - 05:41:52 10100
Kelowna 05:26:51 -9.3 NT Up 16.2 150.6 Really Low 05:11:51 - 05:41:51 10076
Peachland 05:26:52 -9.3 NT Up 16.2 150.3 Really Low 05:11:52 - 05:41:52 10067
Summerland 05:26:52 -9.5 NT Up 16.4 150.3 Really Low 05:11:52 - 05:41:52 10062
Penticton 05:26:52 -9.6 NT Up 16.4 150.4 Really Low 05:11:52 - 05:41:52 10060
Oliver 05:26:53 -9.9 NT Up 16.8 150.4 Really Low 05:11:53 - 05:41:53 10044
Anarchist Mountain Observatory 05:26:53 -10.1 NT Up 17.0 150.5 Really Low 05:11:53 - 05:41:53 10039
Okanogan 05:26:54 -10.5 NT Up 17.5 150.2 Really Low 05:11:54 - 05:41:54 10005
Brewster 05:26:55 -10.7 NT Up 17.6 150.0 Really Low 05:11:55 - 05:41:55 9989
Manson/Chelan 05:26:56 -10.7 NT Up 17.7 149.6 Really Low 05:11:56 - 05:41:56 9973
Victoria 05:27:03 -8.9 NT Up 16.0 146.8 Really Low 05:12:03 - 05:42:03 9954
Wenatchee 05:26:58 -11.0 NT Up 18.0 149.4 Really Low 05:11:58 - 05:41:58 9947
Ellensburg 05:26:59 -11.3 NT Up 18.3 149.1 Really Low 05:11:59 - 05:41:59 9923
Yakima 05:27:00 -11.6 NT Up 18.7 149.1 Really Low 05:12:00 - 05:42:00 9902
PNWRO 05:26:56 -12.7 AT Up 19.7 150.5 Really Low 05:11:56 - 05:41:56 9898
Toppenish/White Swan 05:27:00 -11.8 NT Up 18.9 149.2 Really Low 05:12:00 - 05:42:00 9894
The Dalles 05:27:02 -12.1 AT Up 19.3 148.3 Really Low 05:12:02 - 05:42:02 9841
Maupin 05:27:03 -12.5 AT Up 19.7 148.3 Really Low 05:12:03 - 05:42:03 9820
Sisters 05:27:06 -13.0 AT Up 20.3 147.7 Low 05:12:06 - 05:42:06 9765
Dunrhomin 05:26:22 -22.6 Dark Down 28.9 162.9 Low 05:11:22 - 05:41:22 9761
Bend 05:27:06 -13.3 AT Up 20.6 147.9 Low 05:12:06 - 05:42:06 9756
Nikitin 05:26:21 -22.7 Dark Down 29.1 162.9 Low 05:11:21 - 05:41:21 9750
CU-SBO 05:26:22 -22.8 Dark Down 29.1 162.8 Low 05:11:22 - 05:41:22 9745
Oregon Observatory 05:27:06 -13.4 AT Up 20.7 147.8 Low 05:12:06 - 05:42:06 9744
Chiloquin 05:27:09 -14.3 AT Up 21.6 147.1 Low 05:12:09 - 05:42:09 9662
Klamath Falls 05:27:10 -14.6 AT Up 21.9 147.1 Low 05:12:10 - 05:42:10 9644
Cedarville 05:27:06 -15.8 AT Up 23.1 148.5 Low 05:12:06 - 05:42:06 9630
Fall River/Burney 05:27:10 -15.7 AT Up 23.1 147.2 Low 05:12:10 - 05:42:10 9580
Gimple 05:27:11 -16.6 AT Up 24.1 147.5 Low 05:12:11 - 05:42:11 9534
Greenville 05:27:10 -16.6 AT Up 24.0 147.4 Low 05:12:10 - 05:42:10 9532
Portola 05:27:09 -17.1 AT Up 24.5 147.8 Low 05:12:09 - 05:42:09 9521
Quincy 05:27:11 -16.8 AT Up 24.2 147.4 Low 05:12:11 - 05:42:11 9520
Reno 05:27:08 -17.6 AT Up 25.0 148.3 Low 05:12:08 - 05:42:08 9515
Carson City 05:27:08 -17.9 AT Up 25.3 148.3 Low 05:12:08 - 05:42:08 9493
Yerington 05:27:07 -18.3 Dark Up 25.7 148.8 Low 05:12:07 - 05:42:07 9491
Gardnerville 05:27:09 -18.1 Dark Up 25.5 148.2 Low 05:12:09 - 05:42:09 9478
Hawthorne 05:27:06 -19.0 Dark Up 26.3 149.2 Low 05:12:06 - 05:42:06 9471
Lee Vining 05:27:08 -19.2 Dark Up 26.6 148.6 Low 05:12:08 - 05:42:08 9427
Bishop 05:27:06 -20.0 Dark Up 27.4 149.1 Low 05:12:06 - 05:42:06 9400
Beatty 05:27:03 -21.1 Dark Up 28.5 150.6 Low 05:12:03 - 05:42:03 9396
Patrick 05:26:54 -23.7 Dark Up 30.9 153.0 Up 05:11:54 - 05:41:54 9343
Laughlin/Bullhead City 05:26:58 -23.6 Dark Up 30.8 152.2 Up 05:11:58 - 05:41:58 9315
Lake Havasu City 05:26:56 -24.2 Dark Up 31.5 152.3 Up 05:11:56 - 05:41:56 9273
George/Scottsdale 05:26:48 -26.0 Dark Up 33.1 154.6 Up 05:11:48 - 05:41:48 9257
Idyllwild 05:27:05 -23.8 Dark Up 31.2 149.7 Up 05:12:05 - 05:42:05 9182
Wildwood 05:27:11 -22.6 Dark Up 30.1 148.0 Up 05:12:11 - 05:42:11 9174
Calipatria 05:27:02 -24.8 Dark Up 32.3 150.7 Up 05:12:02 - 05:42:02 9158
Yuma 05:26:59 -25.6 Dark Up 33.0 151.5 Up 05:11:59 - 05:41:59 9142

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 500877, (2026/06/18 05:25UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 12.79 119
35Eta Oph      17:10:22.7 -15:43:29  2.6  3.46 127
PPM 232651     17:08:14.9 -17:36:33  6.0  2.08 127
PPM 232790     17:13:37.2 -18:32:11  8.5  0.55 128
PPM 232810     17:14:25.6 -19:00:41  9.4  0.06 128
500877         17:14:39.8 -19:01:35 15.5       128
Positions are for J2000

Event circumstances last updated at 2024/06/19 21:27:13 UT

Marc W. Buie, Southwest Research Institute

RECON