RECON: TNO occultation with 330836

Event between (330836) Orius and star UC4-272-160879 with event index number of 68106

Geocentric closest approach at 2017/05/01 08:56:38 UTC

J2000 position of star is 18:17:10.0 -35:38:31
Equinox of date position of star is 18:18:15.3 -35:38:06
Stellar brightness R=15.3
Star is 158 degrees from the moon. Moon is 31% illuminated.
TNO apparent brightness V=22.3

TNO is 16.6 AU from the Sun and 16.0 AU from the Earth.
The TNO is moving 12.4 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 551 seconds.
The 1-sigma cross-track error in the shadow position is 3900 km.

The TNO has an absolute magnitude Hv=9.9
Diameter=63.1 km assuming a 5% albedo -- 5.1 sec chord
Diameter=25.8 km assuming a 30% albedo -- 2.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 330836, (2017/05/01 08:57UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:28.4 -26:28:08  0.9 24.75 140
Kap Sco        17:43:41.3 -39:02:14  2.4  7.68 151
Eta Sgr        18:18:48.0 -36:45:17  3.1  1.12 158
PPM 297465     18:16:59.8 -35:37:50  7.6  0.27 158
PPM 297502     18:18:34.3 -35:32:59  9.3  0.10 158
330836         18:18:19.8 -35:38:04 15.3       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.

Event circumstances last updated at 2016/03/20 17:21:00 UT

RECON