RECON: TNO occultation with 342842

Event between (342842) 08YB3 and star UC4-773-049539 with event index number of 191623

Geocentric closest approach at 2019/05/21 19:39:36 UTC

J2000 position of star is 21:03:42.8 +64:27:19
Equinox of date position of star is 21:04:02.5 +64:31:30
Stellar brightness R=15.4, use SENSEUP=128
Star is 92 degrees from the moon. Moon is 91% illuminated.
TNO apparent brightness V=20.7

TNO is 12.5 AU from the Sun and 12.7 AU from the Earth.
The TNO is moving 23.1 km/sec on the sky relative to the star, or, 9.1 arcsec/hr.
The 1-sigma error in the time of the event is 42 seconds.
The 1-sigma cross-track error in the shadow position is 731 km.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 3.6 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 342842, (2019/05/21 19:40UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:05.6 +45:21:01  1.3 19.42  74
Alderamin      21:19:02.4 +62:40:05  2.4  2.50  91
PPM 022646     21:09:53.6 +63:22:31  6.4  1.32  91
PPM 022614     21:07:15.6 +63:51:26  8.3  0.76  91
PPM 022627     21:08:00.1 +64:35:11  8.7  0.42  92
PPM 022590     21:05:39.0 +64:37:49 10.1  0.19  92
342842         21:04:04.7 +64:31:59 15.4        92
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, (2019/05/21 19:40UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 19.42  74
Alderamin      21:18:35.2 +62:35:09  2.4  2.50  91
PPM 022646     21:09:28.9 +63:17:45  6.4  1.32  91
PPM 022614     21:06:52.1 +63:46:42  8.3  0.76  91
PPM 022627     21:07:37.7 +64:30:27  8.7  0.42  92
PPM 022590     21:05:17.0 +64:33:08 10.1  0.19  92
342842         21:03:42.8 +64:27:19 15.4        92
Positions are for J2000

Event circumstances last updated at 2017/06/01 18:15:23 UT

Marc W. Buie, Southwest Research Institute

RECON