RECON: TNO occultation with 281371

Event between (281371) 08FC76 and star GA1000:01157901 with event index number of 318712

Geocentric closest approach at 2020/04/15 13:42:32 UTC

J2000 position of star is 05:56:25.1 +10:24:33
Equinox of date position of star is 05:57:32.2 +10:24:38
Stellar brightness G=15.8, use SENSEUP=128
Star is 143 degrees from the moon. Moon is 44% illuminated.
TNO apparent brightness V=21.2

TNO is 12.0 AU from the Sun and 12.4 AU from the Earth.
The TNO is moving 21.4 km/sec on the sky relative to the star, or, 8.6 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 726 km.

The TNO has an absolute magnitude Hv=10.0
Diameter=83.2 km assuming a 5% albedo -- 2.8 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 281371, (2020/04/15 13:43UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:16.3 +07:24:33  0.4  3.02 141
Bellatrix      05:26:13.2 +06:21:59  1.6  8.74 134
PPM 121631     05:57:57.5 +11:31:19  5.9  1.12 143
PPM 121568     05:55:20.8 +10:35:20  7.6  0.57 142
PPM 121622     05:57:44.5 +10:33:10  9.5  0.15 143
281371         05:57:32.5 +10:24:38 15.8       143
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, (2020/04/15 13:43UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  3.02 141
Bellatrix      05:25:07.8 +06:20:58  1.6  8.74 134
PPM 121631     05:56:49.6 +11:31:15  5.9  1.12 143
PPM 121568     05:54:13.3 +10:35:11  7.6  0.57 142
PPM 121622     05:56:37.1 +10:33:05  9.5  0.15 143
281371         05:56:25.1 +10:24:33 15.8       143
Positions are for J2000

Event circumstances last updated at 2020/03/16 21:24:07 UT

Marc W. Buie, Southwest Research Institute

RECON