RECON: TNO occultation with 470593

Event between (470593) 08LP17 and star UC4-344-082147 with event index number of 146736

Geocentric closest approach at 2018/05/10 18:21:56 UTC

J2000 position of star is 16:36:32.4 -21:23:33
Equinox of date position of star is 16:37:34.3 -21:25:37
Stellar brightness R=14.6, use SENSEUP=128
Star is 100 degrees from the moon. Moon is 25% illuminated.
TNO apparent brightness V=21.0

TNO is 30.2 AU from the Sun and 29.2 AU from the Earth.
The TNO is moving 20.7 km/sec on the sky relative to the star, or, 3.5 arcsec/hr.
The 1-sigma error in the time of the event is 107 seconds.
The 1-sigma cross-track error in the shadow position is 1400 km.

The TNO has an absolute magnitude Hv=6.2
Diameter=346.7 km assuming a 5% albedo -- 16.7 sec chord
Diameter=141.6 km assuming a 30% albedo -- 6.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 470593, (2018/05/10 18:22UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.1 -26:28:16  0.9  5.30 100
23Tau Sco      16:37:01.7 -28:15:09  2.8  6.83  98
PPM 232040     16:42:58.6 -19:57:29  5.8  1.93  99
PPM 265647     16:33:31.3 -20:47:24  8.3  1.15 101
PPM 265710     16:37:21.8 -21:08:19  9.5  0.30 100
470593         16:37:37.8 -21:25:44 14.6        99
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 470593, (2018/05/10 18:22UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  5.30 100
23Tau Sco      16:35:53.0 -28:12:58  2.8  6.83  98
PPM 232040     16:41:53.7 -19:55:27  5.8  1.93  99
PPM 265647     16:32:26.2 -20:45:08  8.3  1.15 101
PPM 265710     16:36:16.5 -21:06:08  9.5  0.30 100
470593         16:36:32.4 -21:23:33 14.6       100
Positions are for J2000

Event circumstances last updated at 2017/05/18 18:02:59 UT

Marc W. Buie, Southwest Research Institute

RECON