RECON: TNO occultation with 12DR30

Event between 12DR30 and star UC4-129-017039 with event index number of 203419

Geocentric closest approach at 2019/07/20 04:12:16 UTC

J2000 position of star is 08:56:45.8 -64:22:52
Equinox of date position of star is 08:57:05.1 -64:27:03
Stellar brightness R=14.8, use SENSEUP=128
Star is 100 degrees from the moon. Moon is 90% illuminated.
TNO apparent brightness V=20.3

TNO is 19.7 AU from the Sun and 19.7 AU from the Earth.
The TNO is moving 23.4 km/sec on the sky relative to the star, or, 5.9 arcsec/hr.
The 1-sigma error in the time of the event is 180 seconds.
The 1-sigma cross-track error in the shadow position is 1525 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=227.0 km assuming a 5% albedo -- 9.7 sec chord
Diameter=92.7 km assuming a 30% albedo -- 4.0 sec chord
Dynamical classification is CENTAURS
 
 
 
 
 
 
 
 

Star training set for 12DR30, (2019/07/20 04:12UT)
Object            RA         Dec     mag  sep  mel
Canopus        06:24:23.2 -52:42:25 -0.7 22.61  96
Bet Car        09:13:24.4 -69:47:53  1.7  5.57  96
PPM 357124     09:06:30.1 -64:34:44  6.3  1.02 100
PPM 357051     08:59:07.2 -64:36:26  6.9  0.26 100
PPM 357021     08:56:38.9 -64:37:47  9.5  0.18 100
12DR30         08:57:06.8 -64:27:25 14.8       100
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, (2019/07/20 04:12UT)
Object            RA         Dec     mag  sep  mel
Canopus        06:23:57.2 -52:41:44 -0.7 22.61  96
Bet Car        09:13:11.4 -69:43:00  1.7  5.57  96
PPM 357124     09:06:07.7 -64:29:59  6.3  1.02 100
PPM 357051     08:58:46.1 -64:31:50  6.9  0.26 100
PPM 357021     08:56:18.2 -64:33:14  9.5  0.18 100
12DR30         08:56:45.8 -64:22:52 14.8       100
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:08:58 UT

Marc W. Buie, Southwest Research Institute

RECON