RECON: TNO occultation with 42355

Event between (42355) Typhon and star UC4-385-063812 with event index number of 68778

Geocentric closest approach at 2017/03/23 00:14:58 UTC

J2000 position of star is 13:51:02.0 -13:03:11
Equinox of date position of star is 13:51:56.0 -13:08:08
Stellar brightness R=14.3
Star is 89 degrees from the moon. Moon is 28% illuminated.
TNO apparent brightness V=20.9

TNO is 21.0 AU from the Sun and 20.1 AU from the Earth.
The TNO is moving 18.8 km/sec on the sky relative to the star, or, 4.6 arcsec/hr.
The 1-sigma error in the time of the event is 61 seconds.
The 1-sigma cross-track error in the shadow position is 850 km.

The TNO has an absolute magnitude Hv=7.6
Diameter=182.0 km assuming a 5% albedo -- 9.7 sec chord
Diameter=74.3 km assuming a 30% albedo -- 3.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 42355, (2017/03/23 00:15UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:06.2 -11:15:03  1.0  6.59  95
86 Vir         13:46:51.5 -12:30:44  5.1  1.39  90
PPM 227934     13:52:30.5 -13:05:59  7.1  0.14  88
42355          13:51:57.4 -13:08:16 14.3        88
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 42355, (2017/03/23 00:15UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0  6.59  95
86 Vir         13:45:56.3 -12:25:35  5.1  1.39  90
PPM 227934     13:51:35.0 -13:00:54  7.1  0.14  88
42355          13:51:02.0 -13:03:11 14.3        88
Positions are for J2000

Event circumstances last updated at 2016/10/07 18:05:48 UT

Marc W. Buie, Southwest Research Institute

RECON