RECON: TNO occultation with 54598

Event between (54598) Bienor and star UC4-654-016976 with event index number of 149117

Geocentric closest approach at 2018/08/19 20:45:57 UTC

J2000 position of star is 03:43:25.0 +40:42:09
Equinox of date position of star is 03:44:37.2 +40:45:30
Stellar brightness R=16.3, use SENSEUP=128
Star is 153 degrees from the moon. Moon is 65% illuminated.
TNO apparent brightness V=19.6

TNO is 14.9 AU from the Sun and 14.9 AU from the Earth.
The TNO is moving 15.2 km/sec on the sky relative to the star, or, 5.0 arcsec/hr.
The 1-sigma error in the time of the event is 51 seconds.
The 1-sigma cross-track error in the shadow position is 982 km.

The TNO has an absolute magnitude Hv=7.5
Diameter=190.6 km assuming a 5% albedo -- 12.6 sec chord
Diameter=77.8 km assuming a 30% albedo -- 5.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 54598, (2018/08/19 20:46UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:36:59.5 +16:32:43  0.8 26.73 175
Algol          03:09:23.3 +41:01:34  2.1  6.67 148
41Nu Per       03:46:28.0 +42:38:09  3.8  1.91 152
PPM 046436     03:42:11.3 +41:14:54  7.1  0.68 152
PPM 046452     03:43:14.7 +40:56:25  9.2  0.32 153
PPM 046465     03:44:45.3 +40:41:46 10.7  0.07 153
54598          03:44:40.1 +40:45:38 16.3       153
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 54598, (2018/08/19 20:46UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 26.73 175
Algol          03:08:10.1 +40:57:20  2.1  6.67 148
41Nu Per       03:45:11.6 +42:34:43  3.8  1.91 152
PPM 046436     03:40:56.1 +41:11:21  7.1  0.68 152
PPM 046452     03:41:59.6 +40:52:54  9.2  0.32 153
PPM 046465     03:43:30.2 +40:38:17 10.7  0.07 153
54598          03:43:25.0 +40:42:09 16.3       153
Positions are for J2000

Event circumstances last updated at 2017/12/05 18:52:58 UT

Marc W. Buie, Southwest Research Institute

RECON