RECON: TNO occultation with 69986

Event between (69986) 98WW24 and star UC4-527-016181 with event index number of 106270

Geocentric closest approach at 2018/02/15 17:33:27 UTC

J2000 position of star is 05:45:53.6 +15:22:40
Equinox of date position of star is 05:46:55.3 +15:23:02
Stellar brightness R=15.6, use SENSEUP=128
Star is 121 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=23.4

TNO is 34.6 AU from the Sun and 34.1 AU from the Earth.
The TNO is moving 10.4 km/sec on the sky relative to the star, or, 1.5 arcsec/hr.
The 1-sigma error in the time of the event is 2331 seconds.
The 1-sigma cross-track error in the shadow position is 5063 km.

The TNO has an absolute magnitude Hv=7.9
Diameter=158.5 km assuming a 5% albedo -- 15.2 sec chord
Diameter=64.7 km assuming a 30% albedo -- 6.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 69986, (2018/02/15 17:33UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:09.2 +07:24:32  0.4  8.29 122
Bellatrix      05:26:06.2 +06:21:53  1.6 10.37 114
131 Tau        05:48:15.1 +14:29:37  5.7  0.95 121
PPM 121338     05:45:33.6 +15:04:12  7.8  0.46 120
PPM 121391     05:48:10.4 +15:28:08  8.8  0.31 121
69986          05:46:56.0 +15:23:02 15.6       121
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, (2018/02/15 17:33UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  8.29 122
Bellatrix      05:25:07.8 +06:20:58  1.6 10.37 114
131 Tau        05:47:13.1 +14:29:18  5.7  0.95 121
PPM 121338     05:44:31.3 +15:03:48  7.8  0.46 120
PPM 121391     05:47:07.9 +15:27:48  8.8  0.31 121
69986          05:45:53.6 +15:22:40 15.6       121
Positions are for J2000

Event circumstances last updated at 2017/12/02 17:16:48 UT

Marc W. Buie, Southwest Research Institute

RECON