RECON: TNO occultation with 523800

Event between (523800) 17KZ31 and star GA0860:03918613 with event index number of 352887

Geocentric closest approach at 2019/05/26 01:13:56 UTC

J2000 position of star is 10:56:16.4 -02:28:07
Equinox of date position of star is 10:57:15.8 -02:34:21
Stellar brightness G=14.8, use SENSEUP=128
Star is 158 degrees from the moon. Moon is 56% illuminated.
TNO apparent brightness V=21.2

TNO is 11.7 AU from the Sun and 11.5 AU from the Earth.
The TNO is moving 18.6 km/sec on the sky relative to the star, or, 8.0 arcsec/hr.
The 1-sigma error in the time of the event is 44 seconds.
The 1-sigma cross-track error in the shadow position is 826 km.

The TNO has an absolute magnitude Hv=10.2
Diameter=55.0 km assuming a 5% albedo -- 3.0 sec chord
Diameter=22.4 km assuming a 30% albedo -- 1.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 523800, (2019/05/26 01:14UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:24.2 +11:52:18  1.3 18.71 176
PPM 178324     10:54:42.9 -02:13:58  6.3  0.72 159
PPM 178351     10:59:49.5 -02:20:26  8.1  0.68 158
PPM 178348     10:58:47.1 -02:42:08  9.8  0.40 158
PPM 178343     10:58:01.3 -02:39:47 10.5  0.21 158
523800         10:57:15.8 -02:34:21 14.8       158
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 523800, (2019/05/26 01:14UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 18.71 176
PPM 178324     10:53:43.6 -02:07:45  6.3  0.72 159
PPM 178351     10:58:50.1 -02:14:11  8.1  0.68 158
PPM 178348     10:57:47.7 -02:35:54  9.8  0.40 158
PPM 178343     10:57:01.9 -02:33:33 10.5  0.21 158
523800         10:56:16.4 -02:28:07 14.8       158
Positions are for J2000

Event circumstances last updated at 2019/05/23 22:39:41 UT

Marc W. Buie, Southwest Research Institute

RECON