RECON: TNO occultation with 05EX297

Event between 05EX297 and star UC4-503-054716 with event index number of 108286

Geocentric closest approach at 2018/03/20 18:42:37 UTC

J2000 position of star is 10:57:52.3 +10:27:40
Equinox of date position of star is 10:58:46.6 +10:22:05
Stellar brightness R=15.2, use SENSEUP=128
Star is 122 degrees from the moon. Moon is 12% illuminated.
TNO apparent brightness V=22.5

TNO is 44.0 AU from the Sun and 43.0 AU from the Earth.
The TNO is moving 24.1 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 318 seconds.
The 1-sigma cross-track error in the shadow position is 5809 km.

The TNO has an absolute magnitude Hv=6.1
Diameter=359.8 km assuming a 5% albedo -- 14.9 sec chord
Diameter=146.9 km assuming a 30% albedo -- 6.1 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 05EX297, (2018/03/20 18:43UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:20.4 +11:52:39  1.3 12.23 110
68Del Leo      11:15:04.5 +20:25:25  2.6 10.79 122
53 Leo         10:50:12.8 +10:26:54  5.3  2.12 120
PPM 157450     11:03:29.8 +09:04:29  7.7  1.73 123
PPM 127829     10:56:46.5 +10:01:24  9.4  0.61 121
PPM 127853     10:58:43.0 +10:33:24 10.2  0.20 122
05EX297        10:58:49.5 +10:21:48 15.2       122
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 05EX297, (2018/03/20 18:43UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 12.23 110
68Del Leo      11:14:06.7 +20:31:23  2.6 10.79 122
53 Leo         10:49:15.4 +10:32:42  5.3  2.12 120
PPM 157450     11:02:32.8 +09:10:23  7.7  1.73 123
PPM 127829     10:55:49.3 +10:07:15  9.4  0.61 121
PPM 127853     10:57:45.7 +10:39:16 10.2  0.20 122
05EX297        10:57:52.3 +10:27:40 15.2       122
Positions are for J2000

Event circumstances last updated at 2017/04/24 16:21:07 UT

Marc W. Buie, Southwest Research Institute

RECON