RECON: TNO occultation with 281371

Event between (281371) 08FC76 and star UC4-538-009419 with event index number of 109918

Geocentric closest approach at 2018/03/07 09:08:52 UTC

J2000 position of star is 04:32:35.0 +17:30:31
Equinox of date position of star is 04:33:35.3 +17:32:40
Stellar brightness R=15.6, use SENSEUP=128
Star is 164 degrees from the moon. Moon is 70% illuminated.
TNO apparent brightness V=20.2

TNO is 11.0 AU from the Sun and 11.1 AU from the Earth.
The TNO is moving 12.5 km/sec on the sky relative to the star, or, 5.6 arcsec/hr.
The 1-sigma error in the time of the event is 76 seconds.
The 1-sigma cross-track error in the shadow position is 492 km.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 6.7 sec chord
Diameter=34.0 km assuming a 30% albedo -- 2.7 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 281371, (2018/03/07 09:09UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:36:58.0 +16:32:40  0.8  1.28 164
Alnath         05:27:26.6 +28:37:16  1.6 16.58 149
PPM 120015     04:34:36.2 +18:03:13  6.3  0.56 164
PPM 120000     04:33:43.4 +17:53:56  9.2  0.35 164
281371         04:33:38.1 +17:32:46 15.6       164
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 281371, (2018/03/07 09:09UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8  1.28 164
Alnath         05:26:17.5 +28:36:24  1.6 16.58 149
PPM 120015     04:33:33.0 +18:01:00  6.3  0.56 164
PPM 120000     04:32:40.2 +17:51:41  9.2  0.35 164
281371         04:32:35.0 +17:30:31 15.6       164
Positions are for J2000

Event circumstances last updated at 2017/05/17 18:03:19 UT

Marc W. Buie, Southwest Research Institute

RECON