RECON: TNO occultation with 10WG9

Event between 10WG9 and star UC4-528-017544 with event index number of 109163

Geocentric closest approach at 2018/02/11 19:06:49 UTC

J2000 position of star is 05:48:48.1 +15:33:20
Equinox of date position of star is 05:49:48.0 +15:33:36
Stellar brightness R=13.5, use SENSEUP=32
Star is 168 degrees from the moon. Moon is 15% illuminated.
TNO apparent brightness V=21.9

TNO is 23.1 AU from the Sun and 22.6 AU from the Earth.
The TNO is moving 17.9 km/sec on the sky relative to the star, or, 3.9 arcsec/hr.
The 1-sigma error in the time of the event is 256 seconds.
The 1-sigma cross-track error in the shadow position is 5412 km.

The TNO has an absolute magnitude Hv=8.1
Diameter=146.6 km assuming a 5% albedo -- 8.2 sec chord
Diameter=59.8 km assuming a 30% albedo -- 3.3 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 10WG9, (2018/02/11 19:07UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:09.2 +07:24:32  0.4  8.30 164
Bellatrix      05:26:06.2 +06:21:53  1.6 10.88 158
131 Tau        05:48:15.1 +14:29:37  5.7  1.13 167
PPM 121449     05:51:04.9 +16:01:02  8.3  0.55 169
PPM 121450     05:51:06.3 +15:40:13  9.2  0.32 168
10WG9          05:49:50.5 +15:33:37 13.5       168
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 10WG9, (2018/02/11 19:07UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  8.30 164
Bellatrix      05:25:07.8 +06:20:58  1.6 10.88 158
131 Tau        05:47:13.1 +14:29:18  5.7  1.13 167
PPM 121449     05:50:02.3 +16:00:47  8.3  0.55 169
PPM 121450     05:50:03.8 +15:39:58  9.2  0.32 168
10WG9          05:48:48.1 +15:33:20 13.5       168
Positions are for J2000

Event circumstances last updated at 2017/05/17 18:01:11 UT

Marc W. Buie, Southwest Research Institute

RECON