RECON: TNO occultation with 503858

Event between (503858) 98HQ151 and star UC4-381-115172 with event index number of 227574

Geocentric closest approach at 2018/06/29 21:24:12 UTC

J2000 position of star is 18:32:42.9 -13:49:33
Equinox of date position of star is 18:33:43.8 -13:48:41
Stellar brightness R=16.5, use SENSEUP=128
Star is 20 degrees from the moon. Moon is 97% illuminated.
TNO apparent brightness V=23.8

TNO is 32.2 AU from the Sun and 31.2 AU from the Earth.
The TNO is moving 23.8 km/sec on the sky relative to the star, or, 3.8 arcsec/hr.
The 1-sigma error in the time of the event is 134 seconds.
The 1-sigma cross-track error in the shadow position is 1341 km.

The TNO has an absolute magnitude Hv=8.8
Diameter=104.7 km assuming a 5% albedo -- 4.4 sec chord
Diameter=42.8 km assuming a 30% albedo -- 1.8 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 503858, (2018/06/29 21:24UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.7 -26:28:17  0.9 31.46  47
Nunki          18:56:24.6 -26:16:20  2.0 13.54  15
PPM 234686     18:33:46.7 -14:51:03  5.1  1.04  20
PPM 234665     18:33:00.7 -13:59:33  8.2  0.26  20
503858         18:33:45.8 -13:48:39 16.5        20
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, (2018/06/29 21:24UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 31.46  47
Nunki          18:55:15.9 -26:17:49  2.0 13.54  15
PPM 234686     18:32:43.3 -14:51:57  5.1  1.04  20
PPM 234665     18:31:57.8 -14:00:25  8.2  0.26  20
503858         18:32:42.9 -13:49:33 16.5        20
Positions are for J2000

Event circumstances last updated at 2017/12/04 18:47:37 UT

Marc W. Buie, Southwest Research Institute

RECON