RECON: TNO occultation with 523790

Event between (523790) 15HP9 and star GA0720:05846069 with event index number of 346948

Geocentric closest approach at 2020/04/17 17:41:38 UTC

J2000 position of star is 16:03:22.3 -17:28:03
Equinox of date position of star is 16:04:30.4 -17:31:15
Stellar brightness G=16.2, use SENSEUP=128
Star is 88 degrees from the moon. Moon is 24% illuminated.
TNO apparent brightness V=22.3

TNO is 15.0 AU from the Sun and 14.2 AU from the Earth.
The TNO is moving 16.2 km/sec on the sky relative to the star, or, 5.7 arcsec/hr.
The 1-sigma error in the time of the event is 87 seconds.
The 1-sigma cross-track error in the shadow position is 668 km.

The TNO has an absolute magnitude Hv=10.4
Diameter=50.1 km assuming a 5% albedo -- 3.1 sec chord
Diameter=20.5 km assuming a 30% albedo -- 1.3 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 523790, (2020/04/17 17:42UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:39.3 -26:28:31  0.9 10.80  80
8Bet1Sco       16:06:37.2 -19:51:34  2.6  2.39  86
49 Lib         16:01:28.1 -16:35:30  5.5  1.18  89
PPM 231132     16:04:28.1 -18:19:26  7.9  0.80  87
PPM 231123     16:04:01.9 -17:29:05  9.0  0.13  88
PPM 231130     16:04:15.1 -17:37:07 10.1  0.12  88
523790         16:04:32.1 -17:31:20 16.2        87
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 523790, (2020/04/17 17:42UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 10.80  80
8Bet1Sco       16:05:26.2 -19:48:20  2.6  2.39  86
49 Lib         16:00:18.7 -16:32:08  5.5  1.18  89
PPM 231132     16:03:17.9 -18:16:09  7.9  0.80  87
PPM 231123     16:02:52.0 -17:25:47  9.0  0.13  88
PPM 231130     16:03:05.1 -17:33:49 10.1  0.12  88
523790         16:03:22.3 -17:28:03 16.2        88
Positions are for J2000

Event circumstances last updated at 2019/10/15 22:17:05 UT

Marc W. Buie, Southwest Research Institute

RECON