RECON: TNO occultation with 12DR30

Event between 12DR30 and star UC4-169-036937 with event index number of 84563

Geocentric closest approach at 2017/10/03 12:45:25 UTC

J2000 position of star is 09:54:24.9 -56:20:31
Equinox of date position of star is 09:55:00.7 -56:25:33
Stellar brightness R=14.6, use SENSEUP=128
Star is 114 degrees from the moon. Moon is 94% illuminated.
TNO apparent brightness V=20.0

TNO is 17.9 AU from the Sun and 18.4 AU from the Earth.
The TNO is moving 35.3 km/sec on the sky relative to the star, or, 9.5 arcsec/hr.
The 1-sigma error in the time of the event is 89 seconds.
The 1-sigma cross-track error in the shadow position is 2230 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=227.0 km assuming a 5% albedo -- 6.4 sec chord
Diameter=92.7 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is CENTAURS
 
 
 
 
 
 
 
 

Star training set for 12DR30, (2017/10/03 12:45UT)
Object            RA         Dec     mag  sep  mel
Bet Cru        12:48:46.2 -59:47:08  1.3 22.77 108
Kap Vel        09:22:39.9 -55:05:13  2.5  4.74 113
PPM 338602     10:02:34.4 -57:26:09  6.3  1.44 113
PPM 338483     09:55:59.5 -56:22:55  8.1  0.14 114
PPM 338456     09:54:52.9 -56:27:09  9.6  0.03 114
12DR30         09:55:00.9 -56:25:35 14.6       114
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 12DR30, (2017/10/03 12:45UT)
Object            RA         Dec     mag  sep  mel
Bet Cru        12:47:43.1 -59:41:20  1.3 22.77 108
Kap Vel        09:22:06.8 -55:00:38  2.5  4.74 113
PPM 338602     10:01:58.0 -57:20:59  6.3  1.44 113
PPM 338483     09:55:23.3 -56:17:50  8.1  0.14 114
PPM 338456     09:54:16.9 -56:22:05  9.6  0.03 114
12DR30         09:54:24.9 -56:20:31 14.6       114
Positions are for J2000

Event circumstances last updated at 2017/08/17 16:12:54 UT

Marc W. Buie, Southwest Research Institute

RECON