RECON: TNO occultation with 281371

Event between (281371) 08FC76 and star GA0980:01205922 with event index number of 318682

Geocentric closest approach at 2019/12/31 22:26:16 UTC

J2000 position of star is 06:00:47.7 +09:57:37
Equinox of date position of star is 06:01:52.0 +09:57:34
Stellar brightness G=11.1, use SENSEUP=8
Star is 103 degrees from the moon. Moon is 29% illuminated.
TNO apparent brightness V=20.0

TNO is 11.8 AU from the Sun and 10.9 AU from the Earth.
The TNO is moving 21.7 km/sec on the sky relative to the star, or, 9.9 arcsec/hr.
The 1-sigma error in the time of the event is 59 seconds.
The 1-sigma cross-track error in the shadow position is 684 km.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 3.8 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 281371, (2019/12/31 22:26UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:15.3 +07:24:33  0.4  2.91 101
Bellatrix      05:26:12.3 +06:21:58  1.6  9.53  94
PPM 121823     06:04:31.8 +11:40:44  6.0  1.84 104
PPM 149749     06:01:25.8 +09:42:05  8.3  0.28 103
PPM 149769     06:02:01.9 +09:54:22  9.3  0.06 103
281371         06:01:53.9 +09:57:34 11.1       103
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, (2019/12/31 22:26UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  2.91 101
Bellatrix      05:25:07.8 +06:20:58  1.6  9.53  94
PPM 121823     06:03:24.8 +11:40:51  6.0  1.84 104
PPM 149749     06:00:19.7 +09:42:07  8.3  0.28 103
PPM 149769     06:00:55.7 +09:54:24  9.3  0.06 103
281371         06:00:47.7 +09:57:37 11.1       103
Positions are for J2000

Event circumstances last updated at 2019/06/07 23:06:12 UT

Marc W. Buie, Southwest Research Institute

RECON