RECON: TNO occultation with 69990

Event between (69990) 98WU31 and star GA1080:01612585 with event index number of 352400

Geocentric closest approach at 2019/08/27 17:38:34 UTC

J2000 position of star is 06:03:19.7 +19:57:57
Equinox of date position of star is 06:04:28.9 +19:57:50
Stellar brightness G=16.1, use SENSEUP=128
Star is 26 degrees from the moon. Moon is 11% illuminated.
TNO apparent brightness V=23.8

TNO is 35.7 AU from the Sun and 36.1 AU from the Earth.
The TNO is moving 18.2 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
The 1-sigma error in the time of the event is 284 seconds.
The 1-sigma cross-track error in the shadow position is 1401 km.

The TNO has an absolute magnitude Hv=8.1
Diameter=144.5 km assuming a 5% albedo -- 7.9 sec chord
Diameter=59.0 km assuming a 30% albedo -- 3.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 69990, (2019/08/27 17:39UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:14.2 +07:24:33  0.4 12.71  32
Alhena         06:38:50.8 +16:22:51  1.9  8.91  19
62Chi2Ori      06:05:05.3 +20:08:11  4.5  0.22  26
PPM 121805     06:03:50.1 +19:55:57  8.5  0.16  26
69990          06:04:29.6 +19:57:50 16.1        25
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 69990, (2019/08/27 17:39UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 12.71  32
Alhena         06:37:42.8 +16:23:57  1.9  8.91  19
62Chi2Ori      06:03:55.2 +20:08:18  4.5  0.22  26
PPM 121805     06:02:40.1 +19:56:02  8.5  0.16  26
69990          06:03:19.7 +19:57:57 16.1        26
Positions are for J2000

Event circumstances last updated at 2019/06/07 22:36:12 UT

Marc W. Buie, Southwest Research Institute

RECON