RECON: TNO occultation with 120181

Event between (120181) 03UR292 and star UC4-528-005967 with event index number of 170305

Geocentric closest approach at 2018/12/22 13:54:33 UTC

J2000 position of star is 03:19:40.1 +15:27:38
Equinox of date position of star is 03:20:37.2 +15:31:17
Stellar brightness R=16.0, use SENSEUP=128
Star is 37 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=21.7

TNO is 27.0 AU from the Sun and 26.2 AU from the Earth.
The TNO is moving 17.3 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 93 seconds.
The 1-sigma cross-track error in the shadow position is 1058 km.

The TNO has an absolute magnitude Hv=7.3
Diameter=208.9 km assuming a 5% albedo -- 12.0 sec chord
Diameter=85.3 km assuming a 30% albedo -- 4.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 120181, (2018/12/22 13:55UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:00.7 +16:32:46  0.8 18.35  19
Menkar         03:03:16.4 +04:09:47  2.5 12.15  45
PPM 119093     03:28:21.6 +12:48:02  6.5  3.30  36
PPM 118986     03:19:30.8 +15:14:39  8.4  0.41  37
PPM 119007     03:21:06.3 +15:43:32  8.8  0.22  37
PPM 118994     03:20:15.0 +15:39:32 11.7  0.17  37
120181         03:20:43.8 +15:31:43 16.0        37
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 120181, (2018/12/22 13:55UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 18.35  19
Menkar         03:02:16.8 +04:05:22  2.5 12.15  45
PPM 119093     03:27:18.7 +12:44:07  6.5  3.30  36
PPM 118986     03:18:27.2 +15:10:33  8.4  0.41  37
PPM 119007     03:20:02.5 +15:39:28  8.8  0.22  37
PPM 118994     03:19:11.2 +15:35:27 11.7  0.17  37
120181         03:19:40.1 +15:27:38 16.0        37
Positions are for J2000

Event circumstances last updated at 2017/01/01 19:06:20 UT

Marc W. Buie, Southwest Research Institute

RECON