RECON: TNO occultation with 500881

Event between (500881) 13JM64 and star GA0740:08433855 with event index number of 2335515

Geocentric closest approach at 2027/06/02 11:42:12 UTC

J2000 position of star is 17:29:09.7 -15:49:27
Equinox of date position of star is 17:30:26.8 -15:50:26
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 136 degrees from the moon. Moon is 7% illuminated.
TNO apparent brightness V=24.3

TNO is 41.0 AU from the Sun and 40.0 AU from the Earth.
The TNO is moving 24.1 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 1948 seconds.
The 1-sigma cross-track error in the shadow position is 4207 km.

The TNO has an absolute magnitude Hv=8.2
Diameter=138.0 km assuming a 5% albedo -- 5.7 sec chord
Diameter=56.4 km assuming a 30% albedo -- 2.3 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 500881, (2027/06/02 11:42UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:05.6 -26:29:25  0.9 17.49 151
35Eta Oph      17:11:57.2 -15:45:25  2.6  4.52 141
PPM 233351     17:39:10.7 -15:35:07  6.2  2.05 134
PPM 233141     17:31:04.4 -16:03:15  7.5  0.22 136
PPM 233151     17:31:32.6 -15:55:58  8.6  0.21 136
500881         17:30:44.3 -15:50:39 16.7       136
Positions are for equinox of date

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 500881, (2027/06/02 11:42UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 17.49 151
35Eta Oph      17:10:22.7 -15:43:29  2.6  4.52 141
PPM 233351     17:37:36.2 -15:34:15  6.2  2.05 134
PPM 233141     17:29:29.6 -16:02:04  7.5  0.22 136
PPM 233151     17:29:57.9 -15:54:48  8.6  0.21 136
500881         17:29:09.7 -15:49:27 16.7       136
Positions are for J2000

Event circumstances last updated at 2022/05/08 23:03:49 UT

Marc W. Buie, Southwest Research Institute

RECON