RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star GA1380:05831510 with event index number of 1007488

Geocentric closest approach at 2020/12/04 21:09:29 UTC

J2000 position of star is 19:54:44.5 +49:48:35
Equinox of date position of star is 19:55:19.8 +49:51:57
Stellar brightness G=16.8, use SENSEUP=128
Star is 107 degrees from the moon. Moon is 81% illuminated.
TNO apparent brightness V=21.0

TNO is 13.5 AU from the Sun and 13.6 AU from the Earth.
The TNO is moving 32.5 km/sec on the sky relative to the star, or, 11.8 arcsec/hr.
The 1-sigma error in the time of the event is 28 seconds.
The 1-sigma cross-track error in the shadow position is 827 km.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 2.6 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 342842, (2020/12/04 21:09UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:08.8 +45:21:21  1.3  9.07 112
PPM 037948     19:57:19.5 +50:57:35  6.3  1.14 106
PPM 058930     19:51:30.4 +49:45:17  8.1  0.63 107
PPM 059083     19:57:42.4 +49:42:28  8.6  0.42 107
PPM 059017     19:55:03.5 +49:38:07 10.4  0.23 107
342842         19:55:19.8 +49:51:57 16.8       107
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 342842, (2020/12/04 21:09UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3  9.07 112
PPM 037948     19:56:45.2 +50:54:10  6.3  1.14 106
PPM 058930     19:50:55.3 +49:42:01  8.1  0.63 107
PPM 059083     19:57:06.8 +49:39:03  8.6  0.42 107
PPM 059017     19:54:28.0 +49:34:45 10.4  0.23 107
342842         19:54:44.5 +49:48:35 16.8       107
Positions are for J2000

Event circumstances last updated at 2020/12/04 19:28:22 UT

Marc W. Buie, Southwest Research Institute

RECON