RECON: TNO occultation with 13TD172

Event between 13TD172 and star GA1000:00109510 with event index number of 2465184

Geocentric closest approach at 2022/10/03 20:39:42 UTC

J2000 position of star is 01:12:03.3 +10:41:56
Equinox of date position of star is 01:13:12.0 +10:48:50
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 89 degrees from the moon. Moon is 60% illuminated.
TNO apparent brightness V=22.8

TNO is 39.3 AU from the Sun and 38.3 AU from the Earth.
The TNO is moving 24.6 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 295 seconds.
The 1-sigma cross-track error in the shadow position is 5216 km.

The TNO has an absolute magnitude Hv=6.9
Diameter=216.8 km assuming a 5% albedo -- 10.2 sec chord
Diameter=88.5 km assuming a 30% albedo -- 4.2 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 13TD172, (2022/10/03 20:40UT)
Object            RA         Dec     mag  sep  mel
6Bet Ari       01:55:54.1 +20:55:06  2.6 14.38 103
75 Psc         01:07:45.7 +13:04:39  6.1  2.63  89
PPM 117123     01:12:40.7 +10:24:44  7.2  0.43  89
PPM 117143     01:14:25.2 +11:08:05 10.2  0.43  89
13TD172        01:13:15.1 +10:49:09 15.9        89
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 13TD172, (2022/10/03 20:40UT)
Object            RA         Dec     mag  sep  mel
6Bet Ari       01:54:38.5 +20:48:26  2.6 14.38 103
75 Psc         01:06:33.7 +12:57:22  6.1  2.63  89
PPM 117123     01:11:29.0 +10:17:31  7.2  0.43  89
PPM 117143     01:13:13.4 +11:00:53 10.2  0.43  89
13TD172        01:12:03.3 +10:41:56 15.9        89
Positions are for J2000

Event circumstances last updated at 2021/10/05 01:12:33 UT

Marc W. Buie, Southwest Research Institute

RECON