RECON: TNO occultation with 309139

Event between (309139) 06XQ51 and star UC4-396-039163 with event index number of 81022

Geocentric closest approach at 2017/05/16 07:44:49 UTC

J2000 position of star is 08:06:22.3 -10:52:23
Equinox of date position of star is 08:07:08.6 -10:55:14
Stellar brightness R=16.0
Star is 150 degrees from the moon. Moon is 76% illuminated.
TNO apparent brightness V=22.5

TNO is 17.2 AU from the Sun and 17.5 AU from the Earth.
The TNO is moving 20.4 km/sec on the sky relative to the star, or, 5.8 arcsec/hr.
The 1-sigma error in the time of the event is 304 seconds.
The 1-sigma cross-track error in the shadow position is 3876 km.

The TNO has an absolute magnitude Hv=9.8
Diameter=66.1 km assuming a 5% albedo -- 3.2 sec chord
Diameter=27.0 km assuming a 30% albedo -- 1.3 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 309139, (2017/05/16 07:45UT)
Object            RA         Dec     mag  sep  mel
Sirius         06:45:54.8 -16:44:26 -1.5 20.56 142
15Rho Pup      08:08:17.1 -24:21:19  2.8 13.43 137
18 Pup         08:11:28.2 -13:51:05  5.7  3.11 147
PPM 219641     08:06:31.8 -10:43:05  8.4  0.26 151
PPM 219667     08:07:21.0 -11:01:36  9.0  0.11 150
309139         08:07:11.9 -10:55:26 16.0       150
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.

Event circumstances last updated at 2016/03/20 17:21:29 UT

RECON