RECON: TNO occultation with 15BJ518

Event between 15BJ518 and star UC4-445-053821 with event index number of 142431

Geocentric closest approach at 2018/02/13 23:10:21 UTC

J2000 position of star is 11:40:51.8 -01:09:34
Equinox of date position of star is 11:41:45.2 -01:15:21
Stellar brightness R=15.2, use SENSEUP=128
Star is 128 degrees from the moon. Moon is 3% illuminated.
TNO apparent brightness V=22.0

TNO is 22.9 AU from the Sun and 22.0 AU from the Earth.
The TNO is moving 19.9 km/sec on the sky relative to the star, or, 4.5 arcsec/hr.
The 1-sigma error in the time of the event is 151 seconds.
The 1-sigma cross-track error in the shadow position is 2370 km.

The TNO has an absolute magnitude Hv=8.3
Diameter=134.3 km assuming a 5% albedo -- 6.7 sec chord
Diameter=54.8 km assuming a 30% albedo -- 2.7 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 15BJ518, (2018/02/13 23:10UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:20.1 +11:52:41  1.3 26.45 154
Denebola       11:49:59.0 +14:28:15  2.1 15.86 131
91Ups Leo      11:37:52.6 -00:55:26  4.3  1.03 129
PPM 178570     11:41:51.6 -00:46:30  7.8  0.49 128
PPM 178569     11:41:39.4 -01:37:25  9.5  0.37 128
15BJ518        11:41:47.5 -01:15:36 15.2       128
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 15BJ518, (2018/02/13 23:10UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3 26.45 154
Denebola       11:49:03.0 +14:34:17  2.1 15.86 131
91Ups Leo      11:36:56.9 -00:49:25  4.3  1.03 129
PPM 178570     11:40:55.9 -00:40:28  7.8  0.49 128
PPM 178569     11:40:43.8 -01:31:23  9.5  0.37 128
15BJ518        11:40:51.8 -01:09:34 15.2       128
Positions are for J2000

Event circumstances last updated at 2017/05/17 18:01:37 UT

Marc W. Buie, Southwest Research Institute

RECON