RECON: TNO occultation with 10370

Event between (10370) Hylonome and star UC4-357-167486 with event index number of 196549

Geocentric closest approach at 2019/06/20 14:00:42 UTC

J2000 position of star is 18:53:27.6 -18:39:41
Equinox of date position of star is 18:54:30.6 -18:38:17
Stellar brightness R=16.4, use SENSEUP=128
Star is 24 degrees from the moon. Moon is 90% illuminated.
TNO apparent brightness V=22.4

TNO is 24.3 AU from the Sun and 23.3 AU from the Earth.
The TNO is moving 22.5 km/sec on the sky relative to the star, or, 4.8 arcsec/hr.
The 1-sigma error in the time of the event is 926 seconds.
The 1-sigma cross-track error in the shadow position is 1795 km.

The TNO has an absolute magnitude Hv=8.6
Diameter=114.8 km assuming a 5% albedo -- 5.1 sec chord
Diameter=46.9 km assuming a 30% albedo -- 2.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 10370, (2019/06/20 14:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:36.2 -26:28:25  0.9 34.04  56
Nunki          18:56:28.3 -26:16:15  2.0  7.65  24
PPM 235314     19:00:32.5 -19:15:05  6.5  1.53  23
PPM 235159     18:54:04.2 -18:14:03  7.6  0.42  24
PPM 235166     18:54:19.9 -18:31:51  8.9  0.12  24
10370          18:54:36.0 -18:38:10 16.4        24
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, (2019/06/20 14:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 34.04  56
Nunki          18:55:15.9 -26:17:49  2.0  7.65  24
PPM 235314     18:59:23.9 -19:16:46  6.5  1.53  23
PPM 235159     18:52:56.0 -18:15:33  7.6  0.42  24
PPM 235166     18:53:11.5 -18:33:22  8.9  0.12  24
10370          18:53:27.6 -18:39:41 16.4        24
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:03:24 UT

Marc W. Buie, Southwest Research Institute

RECON