RECON: TNO occultation with 496315

Event between (496315) 13GP136 and star UC4-405-059626 with event index number of 207517

Geocentric closest approach at 2019/02/22 03:54:41 UTC

J2000 position of star is 14:46:12.0 -09:07:08
Equinox of date position of star is 14:47:08.6 -09:11:32
Stellar brightness R=15.5, use SENSEUP=128
Star is 33 degrees from the moon. Moon is 91% illuminated.
TNO apparent brightness V=23.1

TNO is 43.6 AU from the Sun and 43.2 AU from the Earth.
The TNO is moving 8.5 km/sec on the sky relative to the star, or, 1.0 arcsec/hr.
The 1-sigma error in the time of the event is 214 seconds.
The 1-sigma cross-track error in the shadow position is 2376 km.

The TNO has an absolute magnitude Hv=6.6
Diameter=288.4 km assuming a 5% albedo -- 34.1 sec chord
Diameter=117.7 km assuming a 30% albedo -- 13.9 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 496315, (2019/02/22 03:55UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:12.3 -11:15:38  1.0 20.04  17
27Bet Lib      15:18:02.4 -09:27:09  2.6  7.61  41
13Xi 1Lib      14:55:25.4 -11:58:32  5.9  3.43  36
PPM 197931     14:49:33.8 -09:14:04  8.4  0.58  34
PPM 197916     14:48:16.7 -09:08:20  9.4  0.27  34
496315         14:47:13.6 -09:11:55 15.5        34
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 496315, (2019/02/22 03:55UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 20.04  17
27Bet Lib      15:17:00.3 -09:22:59  2.6  7.61  41
13Xi 1Lib      14:54:22.8 -11:53:54  5.9  3.43  36
PPM 197931     14:48:32.2 -09:09:20  8.4  0.58  34
PPM 197916     14:47:15.1 -09:03:34  9.4  0.27  34
496315         14:46:12.0 -09:07:08 15.5        33
Positions are for J2000

Event circumstances last updated at 2017/08/04 18:04:37 UT

Marc W. Buie, Southwest Research Institute

RECON