RECON: TNO occultation with 85627

Event between (85627) 98HP151 and star UC4-335-088267 with event index number of 86002

Geocentric closest approach at 2017/10/05 11:44:48 UTC

J2000 position of star is 16:53:15.2 -23:04:03
Equinox of date position of star is 16:54:18.1 -23:05:42
Stellar brightness R=16.5, use SENSEUP=128
Star is 114 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=23.7

TNO is 41.4 AU from the Sun and 41.9 AU from the Earth.
The TNO is moving 19.0 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 835 seconds.
The 1-sigma cross-track error in the shadow position is 2810 km.

The TNO has an absolute magnitude Hv=7.4
Diameter=199.5 km assuming a 5% albedo -- 10.5 sec chord
Diameter=81.5 km assuming a 30% albedo -- 4.3 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 85627, (2017/10/05 11:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:29.9 -26:28:12  0.9  6.37 118
23Tau Sco      16:36:59.5 -28:15:05  2.8  6.47 117
26 Oph         17:01:14.9 -25:00:53  5.8  2.49 112
PPM 266128     16:55:55.4 -23:32:24  6.9  0.58 113
PPM 266090     16:54:33.3 -23:11:32  9.9  0.11 114
85627          16:54:19.6 -23:05:44 16.5       114
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 85627, (2017/10/05 11:45UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  6.37 118
23Tau Sco      16:35:53.0 -28:12:58  2.8  6.47 117
26 Oph         17:00:09.6 -24:59:22  5.8  2.49 112
PPM 266128     16:54:50.8 -23:30:45  6.9  0.58 113
PPM 266090     16:53:29.0 -23:09:51  9.9  0.11 114
85627          16:53:15.2 -23:04:03 16.5       114
Positions are for J2000

Event circumstances last updated at 2017/05/16 18:33:25 UT

Marc W. Buie, Southwest Research Institute

RECON