RECON: TNO occultation with 491768

Event between (491768) 12VV113 and star GA0920:00272456 with event index number of 207475

Geocentric closest approach at 2019/07/14 15:47:09 UTC

J2000 position of star is 03:11:03.9 +02:29:17
Equinox of date position of star is 03:12:04.5 +02:33:38
Stellar brightness G=15.9, use SENSEUP=128
Star is 138 degrees from the moon. Moon is 95% illuminated.
TNO apparent brightness V=23.7

TNO is 40.8 AU from the Sun and 41.2 AU from the Earth.
The TNO is moving 18.1 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 364 seconds.
The 1-sigma cross-track error in the shadow position is 3085 km.

The TNO has an absolute magnitude Hv=7.4
Diameter=199.5 km assuming a 5% albedo -- 11.1 sec chord
Diameter=81.5 km assuming a 30% albedo -- 4.5 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 491768, (2019/07/14 15:47UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:02.6 +16:32:49  0.8 25.14 163
Menkar         03:03:18.2 +04:09:55  2.5  2.72 137
97Kap2Cet      03:22:08.2 +03:44:41  6.2  2.78 141
PPM 146314     03:11:56.2 +02:23:19  8.1  0.18 138
PPM 146310     03:11:33.1 +02:37:48 11.0  0.15 138
491768         03:12:04.8 +02:33:39 15.9       139
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 491768, (2019/07/14 15:47UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 25.14 163
Menkar         03:02:16.8 +04:05:21  2.5  2.72 137
97Kap2Cet      03:21:06.9 +03:40:32  6.2  2.78 141
PPM 146314     03:10:55.4 +02:18:56  8.1  0.18 138
PPM 146310     03:10:32.1 +02:33:25 11.0  0.15 138
491768         03:11:03.9 +02:29:17 15.9       138
Positions are for J2000

Event circumstances last updated at 2019/06/07 22:24:42 UT

Marc W. Buie, Southwest Research Institute

RECON