RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star GA1300:08105679 with event index number of 2202084

Geocentric closest approach at 2023/04/29 04:42:12 UTC

J2000 position of star is 20:22:58.4 +40:42:06
Equinox of date position of star is 20:23:45.2 +40:46:23
Stellar brightness G=14.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 118 degrees from the moon. Moon is 62% illuminated.
TNO apparent brightness V=21.4

TNO is 14.9 AU from the Sun and 15.0 AU from the Earth.
The TNO is moving 19.6 km/sec on the sky relative to the star, or, 6.5 arcsec/hr.
The 1-sigma error in the time of the event is 63 seconds.
The 1-sigma cross-track error in the shadow position is 615 km.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 4.2 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.7 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 342842, (2023/04/29 04:40UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:13.7 +45:21:53  1.3  5.69 114
37Gam Cyg      20:23:04.0 +40:19:57  2.2  0.47 118
PPM 059907     20:26:54.3 +40:28:45  6.5  0.66 118
PPM 059815     20:23:34.9 +41:06:05  7.3  0.33 117
PPM 059828     20:23:55.0 +40:41:09  9.0  0.09 118
342842         20:23:48.3 +40:46:40 14.9       117
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, (2023/04/29 04:40UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3  5.69 114
37Gam Cyg      20:22:13.7 +40:15:24  2.2  0.47 118
PPM 059907     20:26:03.9 +40:24:06  6.5  0.66 118
PPM 059815     20:22:45.2 +41:01:32  7.3  0.33 117
PPM 059828     20:23:04.9 +40:36:35  9.0  0.09 118
342842         20:22:58.4 +40:42:06 14.9       118
Positions are for J2000

Event circumstances last updated at 2021/11/15 00:55:09 UT

Marc W. Buie, Southwest Research Institute

RECON