RECON: TNO occultation with 328884

Event between (328884) 10LJ109 and star UC4-219-176238 with event index number of 197699

Geocentric closest approach at 2019/06/20 05:27:00 UTC

J2000 position of star is 19:10:39.5 -46:14:13
Equinox of date position of star is 19:11:58.5 -46:12:23
Stellar brightness R=15.9, use SENSEUP=128
Star is 29 degrees from the moon. Moon is 92% illuminated.
TNO apparent brightness V=21.4

TNO is 13.1 AU from the Sun and 12.2 AU from the Earth.
The TNO is moving 21.1 km/sec on the sky relative to the star, or, 8.6 arcsec/hr.
The 1-sigma error in the time of the event is 218 seconds.
The 1-sigma cross-track error in the shadow position is 1969 km.

The TNO has an absolute magnitude Hv=10.2
Diameter=55.0 km assuming a 5% albedo -- 2.6 sec chord
Diameter=22.4 km assuming a 30% albedo -- 1.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 328884, (2019/06/20 05:27UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:36.2 -26:28:25  0.9 37.46  52
38Zet Sgr      19:03:50.9 -29:51:02  2.7 16.43  19
PPM 324908     19:16:04.3 -45:09:31  6.0  1.26  27
PPM 324850     19:13:07.6 -46:50:50  7.8  0.67  29
PPM 324835     19:11:52.2 -46:17:53 10.0  0.10  29
328884         19:12:05.2 -46:12:13 15.9        28
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 328884, (2019/06/20 05:27UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 37.46  52
38Zet Sgr      19:02:36.7 -29:52:49  2.7 16.43  19
PPM 324908     19:14:39.7 -45:11:37  6.0  1.26  27
PPM 324850     19:11:41.3 -46:52:52  7.8  0.67  29
PPM 324835     19:10:26.4 -46:19:52 10.0  0.10  29
328884         19:10:39.5 -46:14:13 15.9        29
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:03:08 UT

Marc W. Buie, Southwest Research Institute

RECON