RECON: TNO occultation with 500877

Event between (500877) 13JE64 and star GA0700:09852588 with event index number of 2332690

Geocentric closest approach at 2027/06/18 07:00:05 UTC

J2000 position of star is 17:21:21.7 -19:21:03
Equinox of date position of star is 17:22:48.3 -19:22:24
Stellar brightness G=16.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 8 degrees from the moon. Moon is 99% illuminated.
Apparent brightness V=24.2

[RECON map]
Object is 39.1 AU from the Sun and 38.1 AU from the Earth.
Apparent velocity is 24.2 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 536 seconds.
The 1-sigma cross-track error in the shadow position is 3528 km.
The sky-plane scale is 27630.2 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, (2027/06/18 07:00UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:05.8 -26:29:26  0.9 13.89   9
35Eta Oph      17:11:57.3 -15:45:25  2.6  4.47  11
PPM 233026     17:26:13.6 -18:28:07  6.4  1.19   9
PPM 232949     17:22:11.2 -19:21:37  6.9  0.19   8
500877         17:22:58.8 -19:22:33 16.3         8
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 1.7 sigma about the mid-time.
The median site spacing is 17.2 km RECON observability=1.0 and success probability=7.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 06:59:58 -14.5 AT Up 18.4 185.0 Really Low 06:44:58 - 07:14:58 1103
Kamloops 07:00:39 -14.7 AT Up 19.5 170.7 Really Low 06:45:39 - 07:15:39 1007
Kelowna 07:00:37 -15.6 AT Up 20.4 171.6 Low 06:45:37 - 07:15:37 980
Peachland 07:00:38 -15.7 AT Up 20.5 171.3 Low 06:45:38 - 07:15:38 974
Summerland 07:00:38 -15.8 AT Up 20.6 171.4 Low 06:45:38 - 07:15:38 969
Penticton 07:00:38 -15.9 AT Up 20.7 171.5 Low 06:45:38 - 07:15:38 967
Oliver 07:00:38 -16.2 AT Up 21.1 171.5 Low 06:45:38 - 07:15:38 952
Anarchist Mountain Observatory 07:00:37 -16.4 AT Up 21.2 171.6 Low 06:45:37 - 07:15:37 947
Okanogan 07:00:38 -17.0 AT Up 21.9 171.4 Low 06:45:38 - 07:15:38 918
Brewster 07:00:39 -17.3 AT Up 22.1 171.2 Low 06:45:39 - 07:15:39 905
Victoria 07:00:50 -16.2 AT Up 21.3 167.6 Low 06:45:50 - 07:15:50 899
Manson/Chelan 07:00:40 -17.4 AT Up 22.3 170.8 Low 06:45:40 - 07:15:40 893
Wenatchee 07:00:41 -17.8 AT Up 22.7 170.6 Low 06:45:41 - 07:15:41 871
Ellensburg 07:00:42 -18.2 Dark Up 23.1 170.3 Low 06:45:42 - 07:15:42 852
Yakima 07:00:42 -18.6 Dark Up 23.5 170.3 Low 06:45:42 - 07:15:42 833
Toppenish/White Swan 07:00:42 -18.8 Dark Up 23.7 170.5 Low 06:45:42 - 07:15:42 824
PNWRO 07:00:37 -19.4 Dark Up 24.3 171.9 Low 06:45:37 - 07:15:37 816
The Dalles 07:00:45 -19.4 Dark Up 24.4 169.6 Low 06:45:45 - 07:15:45 782
Maupin 07:00:45 -19.9 Dark Up 24.8 169.7 Low 06:45:45 - 07:15:45 763
Sisters 07:00:47 -20.6 Dark Up 25.6 169.1 Low 06:45:47 - 07:15:47 716
Bend 07:00:46 -20.9 Dark Up 25.9 169.3 Low 06:45:46 - 07:15:46 706
Oregon Observatory 07:00:46 -21.0 Dark Up 26.1 169.2 Low 06:45:46 - 07:15:46 697
Chiloquin 07:00:48 -22.2 Dark Up 27.3 168.6 Low 06:45:48 - 07:15:48 625
Klamath Falls 07:00:48 -22.6 Dark Up 27.6 168.7 Low 06:45:48 - 07:15:48 607
Cedarville 07:00:43 -23.5 Dark Up 28.5 170.3 Low 06:45:43 - 07:15:43 581
Dunrhomin 06:59:52 -26.3 Dark Up 30.2 186.3 Up 06:44:52 - 07:14:52 562
Nikitin 06:59:52 -26.5 Dark Up 30.3 186.3 Up 06:44:52 - 07:14:52 552
CU-SBO 06:59:52 -26.6 Dark Up 30.4 186.2 Up 06:44:52 - 07:14:52 548
Fall River/Burney 07:00:48 -23.8 Dark Up 28.9 169.0 Low 06:45:48 - 07:15:48 546
Gimple 07:00:46 -24.7 Dark Up 29.8 169.4 Low 06:45:46 - 07:15:46 498
Greenville 07:00:47 -24.7 Dark Up 29.8 169.3 Low 06:45:47 - 07:15:47 498
Quincy 07:00:47 -24.9 Dark Up 30.0 169.3 Up 06:45:47 - 07:15:47 486
Portola 07:00:45 -25.1 Dark Up 30.2 169.8 Up 06:45:45 - 07:15:45 483
Reno 07:00:43 -25.5 Dark Up 30.5 170.5 Up 06:45:43 - 07:15:43 472
Carson City 07:00:43 -25.9 Dark Up 30.9 170.5 Up 06:45:43 - 07:15:43 451
Yerington 07:00:41 -26.2 Dark Up 31.2 171.1 Up 06:45:41 - 07:15:41 444
Gardnerville 07:00:43 -26.1 Dark Up 31.2 170.5 Up 06:45:43 - 07:15:43 437
Hawthorne 07:00:39 -26.7 Dark Up 31.7 171.7 Up 06:45:39 - 07:15:39 420
Lee Vining 07:00:41 -27.2 Dark Up 32.2 171.1 Up 06:45:41 - 07:15:41 384
Bishop 07:00:39 -27.9 Dark Up 32.9 171.8 Up 06:45:39 - 07:15:39 351
Beatty 07:00:33 -28.7 Dark Up 33.5 173.6 Up 06:45:33 - 07:15:33 333
Patrick 07:00:23 -30.6 Dark Up 35.2 176.8 Up 06:45:23 - 07:15:23 253
Laughlin/Bullhead City 07:00:25 -30.7 Dark Up 35.4 175.9 Up 06:45:25 - 07:15:25 234
Lake Havasu City 07:00:24 -31.4 Dark Up 36.1 176.2 Up 06:45:24 - 07:15:24 191
George/Scottsdale 07:00:15 -32.5 Dark Up 36.9 179.0 Up 06:45:15 - 07:15:15 150
Wildwood 07:00:40 -31.0 Dark Up 36.1 171.3 Up 06:45:40 - 07:15:40 141
Idyllwild 07:00:33 -31.8 Dark Up 36.6 173.4 Up 06:45:33 - 07:15:33 129
Calipatria 07:00:29 -32.6 Dark Up 37.4 174.7 Up 06:45:29 - 07:15:29 94
Yuma 07:00:26 -33.1 Dark Up 37.8 175.7 Up 06:45:26 - 07:15:26 69

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, (2027/06/18 07:00UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 13.89   9
35Eta Oph      17:10:22.7 -15:43:29  2.6  4.47  11
PPM 233026     17:24:37.1 -18:26:45  6.4  1.19   9
PPM 232949     17:20:34.1 -19:20:04  6.9  0.19   8
500877         17:21:21.7 -19:21:03 16.3         8
Positions are for J2000

Event circumstances last updated at 2024/06/21 21:28:55 UT

Marc W. Buie, Southwest Research Institute

RECON