RECON: TNO occultation with 10370

Event between (10370) Hylonome and star UC4-356-157953 with event index number of 126930

Geocentric closest approach at 2018/06/18 01:23:53 UTC

J2000 position of star is 18:40:38.0 -18:51:24
Equinox of date position of star is 18:41:37.7 -18:50:23
Stellar brightness R=16.5
Star is 134 degrees from the moon. Moon is 24% illuminated.
TNO apparent brightness V=22.4

TNO is 24.0 AU from the Sun and 23.0 AU from the Earth.
The TNO is moving 22.5 km/sec on the sky relative to the star, or, 4.9 arcsec/hr.
The 1-sigma error in the time of the event is 797 seconds.
The 1-sigma cross-track error in the shadow position is 2512 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, (2018/06/18 01:24UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:32.5 -26:28:17  0.9 31.12 104
Nunki          18:56:24.5 -26:16:20  2.0  8.17 137
PPM 234930     18:44:00.3 -19:15:54  6.1  0.69 134
PPM 234838     18:39:58.6 -19:05:15  8.2  0.48 133
PPM 234899     18:42:44.9 -18:54:06  9.8  0.25 134
10370          18:41:43.0 -18:50:18 16.5       134
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, (2018/06/18 01:24UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:55  0.9 31.12 104
Nunki          18:55:15.9 -26:17:49  2.0  8.17 137
PPM 234930     18:42:55.1 -19:17:04  6.1  0.69 134
PPM 234838     18:38:53.4 -19:06:18  8.2  0.48 133
PPM 234899     18:41:39.8 -18:55:14  9.8  0.25 134
10370          18:40:38.0 -18:51:24 16.5       134
Positions are for J2000

Event circumstances last updated at 2016/12/10 17:29:18 UT

Marc W. Buie, Southwest Research Institute

RECON