RECON: TNO occultation with 10370

Event between (10370) Hylonome and star UC4-356-164579 with event index number of 201739

Geocentric closest approach at 2019/08/02 01:46:35 UTC

J2000 position of star is 18:47:46.8 -18:48:04
Equinox of date position of star is 18:48:49.9 -18:46:49
Stellar brightness R=15.0, use SENSEUP=128
Star is 138 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=22.5

TNO is 24.4 AU from the Sun and 23.5 AU from the Earth.
The TNO is moving 19.9 km/sec on the sky relative to the star, or, 4.2 arcsec/hr.
The 1-sigma error in the time of the event is 1050 seconds.
The 1-sigma cross-track error in the shadow position is 2078 km.

The TNO has an absolute magnitude Hv=8.6
Diameter=114.8 km assuming a 5% albedo -- 5.8 sec chord
Diameter=46.9 km assuming a 30% albedo -- 2.4 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 10370, (2019/08/02 01:47UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:36.7 -26:28:26  0.9 32.72 107
Nunki          18:56:28.7 -26:16:14  2.0  7.69 140
PPM 234997     18:47:10.5 -19:35:04  6.3  0.91 138
PPM 235021     18:48:42.3 -18:43:54  8.5  0.07 138
10370          18:48:55.8 -18:46:42 15.0       138
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 10370, (2019/08/02 01:47UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 32.72 107
Nunki          18:55:15.9 -26:17:49  2.0  7.69 140
PPM 234997     18:46:01.2 -19:36:23  6.3  0.91 138
PPM 235021     18:47:33.4 -18:45:15  8.5  0.07 138
10370          18:47:46.8 -18:48:04 15.0       138
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:11:01 UT

Marc W. Buie, Southwest Research Institute

RECON