RECON: TNO occultation with 517717

Event between (517717) 15KZ120 and star GA1440:05251993 with event index number of 267499

Geocentric closest approach at 2020/01/31 21:40:50 UTC

J2000 position of star is 18:44:22.3 +54:17:55
Equinox of date position of star is 18:44:47.2 +54:19:13
Stellar brightness G=14.6, use SENSEUP=128
Star is 95 degrees from the moon. Moon is 39% illuminated.
TNO apparent brightness V=19.8

TNO is 8.6 AU from the Sun and 8.7 AU from the Earth.
The TNO is moving 42.6 km/sec on the sky relative to the star, or, 24.2 arcsec/hr.
The 1-sigma error in the time of the event is 10 seconds.
The 1-sigma cross-track error in the shadow position is 441 km.

The TNO has an absolute magnitude Hv=10.0
Diameter=60.3 km assuming a 5% albedo -- 1.4 sec chord
Diameter=24.6 km assuming a 30% albedo -- 0.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 517717, (2020/01/31 21:41UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:37.1 +38:48:12  0.0 15.56 101
Etamin         17:57:04.4 +51:29:14  2.2  7.72 102
PPM 036799     18:43:54.7 +53:53:35  6.1  0.45  95
PPM 036815     18:45:08.9 +54:32:49 10.7  0.23  95
517717         18:44:47.4 +54:19:13 14.6        95
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 517717, (2020/01/31 21:41UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.7 +38:47:07  0.0 15.56 101
Etamin         17:56:36.3 +51:29:20  2.2  7.72 102
PPM 036799     18:43:29.0 +53:52:18  6.1  0.45  95
PPM 036815     18:44:44.1 +54:31:30 10.7  0.23  95
517717         18:44:22.3 +54:17:55 14.6        95
Positions are for J2000

Event circumstances last updated at 2019/11/26 22:20:45 UT

Marc W. Buie, Southwest Research Institute

RECON