RECON: TNO occultation with 503858

Event between (503858) 98HQ151 and star GA0760:17776604 with event index number of 227946

Geocentric closest approach at 2019/05/12 22:10:26 UTC

J2000 position of star is 18:45:35.4 -13:28:20
Equinox of date position of star is 18:46:37.8 -13:27:06
Stellar brightness G=15.0, use SENSEUP=128
Star is 126 degrees from the moon. Moon is 60% illuminated.
TNO apparent brightness V=24.0

TNO is 32.4 AU from the Sun and 31.8 AU from the Earth.
The TNO is moving 14.1 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 231 seconds.
The 1-sigma cross-track error in the shadow position is 1383 km.

The TNO has an absolute magnitude Hv=8.8
Diameter=104.7 km assuming a 5% albedo -- 7.4 sec chord
Diameter=42.8 km assuming a 30% albedo -- 3.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 503858, (2019/05/12 22:10UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:35.9 -26:28:24  0.9 34.38  97
Nunki          18:56:27.9 -26:16:16  2.0 13.02 129
PPM 235105     18:51:36.8 -13:32:54  6.5  1.20 128
PPM 234987     18:46:45.6 -13:38:59  8.5  0.20 126
PPM 234989     18:46:51.5 -13:27:16  9.9  0.04 126
503858         18:46:41.0 -13:27:02 15.0       127
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 503858, (2019/05/12 22:10UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 34.38  97
Nunki          18:55:15.9 -26:17:49  2.0 13.02 129
PPM 235105     18:50:31.2 -13:34:20  6.5  1.20 128
PPM 234987     18:45:39.9 -13:40:17  8.5  0.20 126
PPM 234989     18:45:45.9 -13:28:34  9.9  0.04 126
503858         18:45:35.4 -13:28:20 15.0       126
Positions are for J2000

Event circumstances last updated at 2018/06/11 23:09:00 UT

Marc W. Buie, Southwest Research Institute

RECON