RECON: TNO occultation with 330836

Event between (330836) Orius and star UC4-261-181229 with event index number of 209368

Geocentric closest approach at 2019/08/20 06:00:54 UTC

J2000 position of star is 18:49:08.5 -37:50:50
Equinox of date position of star is 18:50:21.8 -37:49:32
Stellar brightness R=15.3, use SENSEUP=128
Star is 97 degrees from the moon. Moon is 81% illuminated.
TNO apparent brightness V=22.6

TNO is 18.1 AU from the Sun and 17.4 AU from the Earth.
The TNO is moving 13.7 km/sec on the sky relative to the star, or, 3.9 arcsec/hr.
The 1-sigma error in the time of the event is 735 seconds.
The 1-sigma cross-track error in the shadow position is 1990 km.

The TNO has an absolute magnitude Hv=9.9
Diameter=63.1 km assuming a 5% albedo -- 4.6 sec chord
Diameter=25.8 km assuming a 30% albedo -- 1.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 330836, (2019/08/20 06:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:36.9 -26:28:26  0.9 31.48 128
38Zet Sgr      19:03:51.5 -29:51:01  2.7  8.44  94
Lam CrA        18:45:07.6 -38:18:10  5.2  1.16  98
PPM 298162     18:48:39.2 -37:31:34  7.3  0.47  97
PPM 298171     18:49:30.3 -37:33:38  9.3  0.33  97
330836         18:50:28.8 -37:49:25 15.3        97
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 330836, (2019/08/20 06:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 31.48 128
38Zet Sgr      19:02:36.7 -29:52:49  2.7  8.44  94
Lam CrA        18:43:46.9 -38:19:26  5.2  1.16  98
PPM 298162     18:47:19.1 -37:32:56  7.3  0.47  97
PPM 298171     18:48:10.2 -37:35:01  9.3  0.33  97
330836         18:49:08.5 -37:50:50 15.3        97
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:13:08 UT

Marc W. Buie, Southwest Research Institute

RECON