RECON: TNO occultation with 15810

Event between (15810) Arawn and star GA0700:33248923 with event index number of 321554

Geocentric closest approach at 2020/07/19 11:01:43 UTC

J2000 position of star is 19:30:18.4 -19:38:14
Equinox of date position of star is 19:31:29.4 -19:35:38
Stellar brightness G=15.6, use SENSEUP=128
Star is 170 degrees from the moon. Moon is 2% illuminated.
TNO apparent brightness V=25.5

TNO is 35.8 AU from the Sun and 34.8 AU from the Earth.
The TNO is moving 24.0 km/sec on the sky relative to the star, or, 3.4 arcsec/hr.
The 1-sigma error in the time of the event is 607 seconds.
The 1-sigma cross-track error in the shadow position is 3167 km.

The TNO has an absolute magnitude Hv=10.0
Diameter=173.8 km assuming a 5% albedo -- 2.5 sec chord
Diameter=70.9 km assuming a 30% albedo -- 1.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 15810, (2020/07/19 11:02UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:40.2 -26:28:33  0.9 41.96 148
Nunki          18:56:32.3 -26:16:10  2.0 10.45 177
PPM 236251     19:38:14.8 -18:11:02  5.7  2.13 167
PPM 236080     19:31:21.6 -19:20:30  7.8  0.25 169
PPM 236072     19:31:14.9 -19:30:36  8.7  0.10 170
15810          19:31:30.7 -19:35:35 15.6       169
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 15810, (2020/07/19 11:02UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 41.96 148
Nunki          18:55:15.9 -26:17:49  2.0 10.45 177
PPM 236251     19:37:03.4 -18:13:52  5.7  2.13 167
PPM 236080     19:30:09.6 -19:23:08  7.8  0.25 169
PPM 236072     19:30:02.7 -19:33:14  8.7  0.10 170
15810          19:30:18.4 -19:38:14 15.6       170
Positions are for J2000

Event circumstances last updated at 2020/03/12 20:32:24 UT

Marc W. Buie, Southwest Research Institute

RECON