RECON: TNO occultation with 83982

Event between (83982) Crantor and star UC4-351-188203 with event index number of 82083

Geocentric closest approach at 2017/03/30 07:55:34 UTC

J2000 position of star is 20:39:36.9 -19:58:35
Equinox of date position of star is 20:40:32.8 -19:55:06
Stellar brightness R=11.6
Star is 93 degrees from the moon. Moon is 7% illuminated.
TNO apparent brightness V=21.7

TNO is 18.3 AU from the Sun and 18.7 AU from the Earth.
The TNO is moving 21.0 km/sec on the sky relative to the star, or, 5.6 arcsec/hr.
The 1-sigma error in the time of the event is 172 seconds.
The 1-sigma cross-track error in the shadow position is 716 km.

The TNO has an absolute magnitude Hv=8.8
Diameter=104.7 km assuming a 5% albedo -- 5.0 sec chord
Diameter=42.8 km assuming a 30% albedo -- 2.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 83982, (2017/03/30 07:56UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:36.0 -29:31:50  1.2 32.64  66
38Zet Sgr      19:03:42.4 -29:51:15  2.7 24.05 115
15Ups Cap      20:41:01.7 -18:04:37  5.2  1.84  92
PPM 271379     20:37:26.2 -20:31:30  7.5  0.96  93
PPM 271439     20:40:35.7 -20:01:40  9.5  0.11  93
83982          20:40:36.3 -19:54:52 11.6        92
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 17:20:07 UT

Marc W. Buie, Southwest Research Institute

RECON