RECON: TNO occultation with 10370

Event between (10370) Hylonome and star UC4-354-142517 with event index number of 152873

Geocentric closest approach at 2018/10/24 04:03:49 UTC

J2000 position of star is 18:33:38.2 -19:12:50
Equinox of date position of star is 18:34:41.6 -19:11:56
Stellar brightness R=14.9, use SENSEUP=128
Star is 107 degrees from the moon. Moon is 99% illuminated.
TNO apparent brightness V=22.7

TNO is 24.1 AU from the Sun and 24.5 AU from the Earth.
The TNO is moving 18.0 km/sec on the sky relative to the star, or, 3.7 arcsec/hr.
The 1-sigma error in the time of the event is 1210 seconds.
The 1-sigma cross-track error in the shadow position is 1686 km.

The TNO has an absolute magnitude Hv=8.6
Diameter=114.8 km assuming a 5% albedo -- 6.4 sec chord
Diameter=46.9 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 10370, (2018/10/24 04:04UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:33.8 -26:28:20  0.9 29.44 134
Nunki          18:56:25.8 -26:16:18  2.0  8.66 101
PPM 234623     18:31:18.2 -18:42:55  5.5  0.95 107
PPM 234682     18:33:35.6 -18:57:27  7.2  0.36 107
PPM 234714     18:35:05.3 -19:27:48  9.5  0.28 106
10370          18:34:44.7 -19:11:54 14.9       106
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, (2018/10/24 04:04UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 29.44 134
Nunki          18:55:15.9 -26:17:49  2.0  8.66 101
PPM 234623     18:30:11.9 -18:43:45  5.5  0.95 107
PPM 234682     18:32:29.2 -18:58:22  7.2  0.36 107
PPM 234714     18:33:58.6 -19:28:44  9.5  0.28 106
10370          18:33:38.2 -19:12:50 14.9       107
Positions are for J2000

Event circumstances last updated at 2017/12/05 19:00:48 UT

Marc W. Buie, Southwest Research Institute

RECON