RECON: TNO occultation with 12DR30

Event between 12DR30 and star UC4-144-030399 with event index number of 94090

Geocentric closest approach at 2017/12/20 15:47:41 UTC

J2000 position of star is 09:54:39.5 -61:17:46
Equinox of date position of star is 09:55:11.3 -61:22:48
Stellar brightness R=16.3, use SENSEUP=128
Star is 95 degrees from the moon. Moon is 5% illuminated.
TNO apparent brightness V=20.0

TNO is 18.1 AU from the Sun and 18.2 AU from the Earth.
The TNO is moving 36.2 km/sec on the sky relative to the star, or, 9.8 arcsec/hr.
The 1-sigma error in the time of the event is 69 seconds.
The 1-sigma cross-track error in the shadow position is 2897 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=227.0 km assuming a 5% albedo -- 6.3 sec chord
Diameter=92.7 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is CENTAURS
 
 
 
 
 
 
 
 

Star training set for 12DR30, (2017/12/20 15:48UT)
Object            RA         Dec     mag  sep  mel
Bet Cru        12:48:47.0 -59:47:12  1.3 20.98  80
Iot Car        09:17:34.2 -59:21:04  2.3  5.07  99
PPM 357723     10:03:22.4 -62:14:38  6.3  1.29  94
PPM 357648     09:55:30.7 -60:43:35  7.8  0.66  96
PPM 357663     09:57:40.1 -61:23:40  9.5  0.30  95
12DR30         09:55:12.0 -61:22:54 16.3        95
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, (2017/12/20 15:48UT)
Object            RA         Dec     mag  sep  mel
Bet Cru        12:47:43.1 -59:41:20  1.3 20.98  80
Iot Car        09:17:05.4 -59:16:31  2.3  5.07  99
PPM 357723     10:02:49.3 -62:09:24  6.3  1.29  94
PPM 357648     09:54:57.6 -60:38:27  7.8  0.66  96
PPM 357663     09:57:07.3 -61:18:30  9.5  0.30  95
12DR30         09:54:39.5 -61:17:46 16.3        95
Positions are for J2000

Event circumstances last updated at 2017/08/17 16:13:39 UT

Marc W. Buie, Southwest Research Institute

RECON