RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star GA1320:06503279 with event index number of 2201211

Geocentric closest approach at 2021/12/18 12:27:46 UTC

J2000 position of star is 19:56:39.1 +43:39:05
Equinox of date position of star is 19:57:21.9 +43:42:38
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 102 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=21.2

TNO is 14.2 AU from the Sun and 14.4 AU from the Earth.
The TNO is moving 30.8 km/sec on the sky relative to the star, or, 10.6 arcsec/hr.
The 1-sigma error in the time of the event is 27 seconds.
The 1-sigma cross-track error in the shadow position is 965 km.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 2.7 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 342842, (2021/12/18 12:28UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:10.9 +45:21:35  1.3  8.15  96
37Gam Cyg      20:23:01.0 +40:19:41  2.2  5.84 102
PPM 059108     19:58:40.4 +42:19:16  6.5  1.41 103
PPM 059143     20:00:25.0 +43:39:56  8.3  0.55 102
PPM 059074     19:57:37.5 +43:34:49  9.8  0.14 102
PPM 059077     19:57:42.8 +43:48:44 10.9  0.12 102
342842         19:57:22.2 +43:42:40 16.6       102
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, (2021/12/18 12:28UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3  8.15  96
37Gam Cyg      20:22:13.7 +40:15:24  2.2  5.84 102
PPM 059108     19:57:56.1 +42:15:39  6.5  1.41 103
PPM 059143     19:59:41.7 +43:36:16  8.3  0.55 102
PPM 059074     19:56:54.3 +43:31:13  9.8  0.14 102
PPM 059077     19:56:59.8 +43:45:08 10.9  0.12 102
342842         19:56:39.1 +43:39:05 16.6       102
Positions are for J2000

Event circumstances last updated at 2021/10/23 00:34:14 UT

Marc W. Buie, Southwest Research Institute

RECON