RECON: TNO occultation with 418993

Event between (418993) 09MS9 and star UC4-459-004776 with event index number of 209604

Geocentric closest approach at 2019/09/02 06:33:50 UTC

J2000 position of star is 03:30:00.8 +01:44:02
Equinox of date position of star is 03:30:55.8 +01:47:37
Stellar brightness R=14.2, use SENSEUP=64
Star is 148 degrees from the moon. Moon is 12% illuminated.
TNO apparent brightness V=22.1

TNO is 16.1 AU from the Sun and 15.7 AU from the Earth.
The TNO is moving 17.2 km/sec on the sky relative to the star, or, 5.4 arcsec/hr.
The 1-sigma error in the time of the event is 55 seconds.
The 1-sigma cross-track error in the shadow position is 576 km.

The TNO has an absolute magnitude Hv=9.8
Diameter=66.1 km assuming a 5% albedo -- 3.8 sec chord
Diameter=27.0 km assuming a 30% albedo -- 1.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 418993, (2019/09/02 06:34UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:03.1 +16:32:51  0.8 21.94 130
Menkar         03:03:18.6 +04:09:57  2.5  7.31 154
10 Tau         03:37:52.7 +00:27:47  4.3  2.17 146
PPM 146571     03:28:15.2 +02:20:51  7.7  0.88 148
PPM 146624     03:31:35.6 +02:08:44  9.0  0.37 147
418993         03:31:02.0 +01:48:01 14.2       147
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 418993, (2019/09/02 06:34UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 21.94 130
Menkar         03:02:16.8 +04:05:22  2.5  7.31 154
10 Tau         03:36:52.1 +00:23:57  4.3  2.17 146
PPM 146571     03:27:13.9 +02:16:48  7.7  0.88 148
PPM 146624     03:30:34.3 +02:04:46  9.0  0.37 147
418993         03:30:00.8 +01:44:02 14.2       148
Positions are for J2000

Event circumstances last updated at 2017/09/01 17:04:53 UT

Marc W. Buie, Southwest Research Institute

RECON