RECON: TNO occultation with 281371

Event between (281371) 08FC76 and star UC4-514-020736 with event index number of 209221

Geocentric closest approach at 2019/08/29 19:42:07 UTC

J2000 position of star is 06:10:11.6 +12:45:41
Equinox of date position of star is 06:11:12.2 +12:45:24
Stellar brightness R=16.2, use SENSEUP=128
Star is 56 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=20.4

TNO is 11.7 AU from the Sun and 12.1 AU from the Earth.
The TNO is moving 22.9 km/sec on the sky relative to the star, or, 9.4 arcsec/hr.
The 1-sigma error in the time of the event is 62 seconds.
The 1-sigma cross-track error in the shadow position is 932 km.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.2 km assuming a 5% albedo -- 3.6 sec chord
Diameter=34.0 km assuming a 30% albedo -- 1.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 281371, (2019/08/29 19:42UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:14.2 +07:24:33  0.4  6.51  61
Alhena         06:38:50.8 +16:22:51  1.9  7.59  49
PPM 122055     06:12:34.7 +13:37:57  6.0  0.93  56
PPM 121988     06:10:21.3 +12:58:05  8.4  0.31  56
PPM 122039     06:12:08.3 +12:43:49 11.0  0.21  56
281371         06:11:18.0 +12:45:22 16.2        56
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, (2019/08/29 19:42UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  6.51  61
Alhena         06:37:42.8 +16:23:57  1.9  7.59  49
PPM 122055     06:11:27.9 +13:38:18  6.0  0.93  56
PPM 121988     06:09:14.8 +12:58:22  8.4  0.31  56
PPM 122039     06:11:01.9 +12:44:09 11.0  0.21  56
281371         06:10:11.6 +12:45:41 16.2        56
Positions are for J2000

Event circumstances last updated at 2017/12/14 18:21:43 UT

Marc W. Buie, Southwest Research Institute

RECON