RECON: TNO occultation with 432949

Event between (432949) 12HH2 and star UC4-465-050530 with event index number of 96663

Geocentric closest approach at 2017/12/22 06:45:49 UTC

J2000 position of star is 14:07:28.1 +02:49:53
Equinox of date position of star is 14:08:19.5 +02:45:05
Stellar brightness R=15.5
Star is 105 degrees from the moon. Moon is 14% illuminated.
TNO apparent brightness V=21.4

TNO is 30.5 AU from the Sun and 31.0 AU from the Earth.
The TNO is moving 19.9 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 80 seconds.
The 1-sigma cross-track error in the shadow position is 1599 km.

The TNO has an absolute magnitude Hv=6.3
Diameter=331.1 km assuming a 5% albedo -- 16.6 sec chord
Diameter=135.2 km assuming a 30% albedo -- 6.8 sec chord
Dynamical classification is 5:4E+10:8II
 
 
 
 
 
 
 
 

Star training set for 432949, (2017/12/22 06:46UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:16:29.0 +19:05:24  0.0 16.46 107
Spica          13:26:08.5 -11:15:17  1.0 17.50 110
PPM 160430     14:13:10.5 +02:19:32  4.7  1.27 103
PPM 160390     14:10:22.7 +02:42:48  7.4  0.50 104
432949         14:08:22.7 +02:44:47 15.5       104
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 432949, (2017/12/22 06:46UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:15:38.4 +19:10:23  0.0 16.46 107
Spica          13:25:11.5 -11:09:41  1.0 17.50 110
PPM 160430     14:12:15.7 +02:24:34  4.7  1.27 103
PPM 160390     14:09:28.1 +02:47:52  7.4  0.50 104
432949         14:07:28.1 +02:49:53 15.5       105
Positions are for J2000

Event circumstances last updated at 2016/11/30 19:16:54 UT

Marc W. Buie, Southwest Research Institute

RECON