RECON: TNO occultation with 69986

Event between (69986) 98WW24 and star UC4-528-016964 with event index number of 114865

Geocentric closest approach at 2018/04/10 01:00:02 UTC

J2000 position of star is 05:46:32.0 +15:31:50
Equinox of date position of star is 05:47:32.5 +15:32:10
Stellar brightness R=15.6, use SENSEUP=128
Star is 137 degrees from the moon. Moon is 34% illuminated.
TNO apparent brightness V=23.5

TNO is 34.6 AU from the Sun and 35.0 AU from the Earth.
The TNO is moving 16.6 km/sec on the sky relative to the star, or, 2.4 arcsec/hr.
The 1-sigma error in the time of the event is 1402 seconds.
The 1-sigma cross-track error in the shadow position is 4565 km.

The TNO has an absolute magnitude Hv=7.9
Diameter=158.5 km assuming a 5% albedo -- 9.5 sec chord
Diameter=64.7 km assuming a 30% albedo -- 3.9 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 69986, (2018/04/10 01:00UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:09.7 +07:24:32  0.4  8.39 137
Bellatrix      05:26:06.7 +06:21:53  1.6 10.57 130
131 Tau        05:48:15.6 +14:29:37  5.7  1.06 137
PPM 121403     05:48:42.9 +15:02:11  8.0  0.57 137
PPM 121391     05:48:10.9 +15:28:08  8.8  0.16 137
69986          05:47:34.9 +15:32:10 15.6       137
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 69986, (2018/04/10 01:00UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  8.39 137
Bellatrix      05:25:07.8 +06:20:58  1.6 10.57 130
131 Tau        05:47:13.1 +14:29:18  5.7  1.06 137
PPM 121403     05:47:40.2 +15:01:52  8.0  0.57 137
PPM 121391     05:47:07.9 +15:27:48  8.8  0.16 137
69986          05:46:32.0 +15:31:50 15.6       137
Positions are for J2000

Event circumstances last updated at 2017/08/01 16:36:33 UT

Marc W. Buie, Southwest Research Institute

RECON