RECON: TNO occultation with 493480

Event between (493480) 14YZ49 and star UC4-511-052788 with event index number of 194075

Geocentric closest approach at 2018/02/15 14:30:37 UTC

J2000 position of star is 12:23:07.0 +12:03:13
Equinox of date position of star is 12:24:00.1 +11:57:26
Stellar brightness R=14.0, use SENSEUP=64
Star is 142 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=21.3

TNO is 39.5 AU from the Sun and 38.7 AU from the Earth.
The TNO is moving 20.7 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 101 seconds.
The 1-sigma cross-track error in the shadow position is 1753 km.

The TNO has an absolute magnitude Hv=5.3
Diameter=524.8 km assuming a 5% albedo -- 25.3 sec chord
Diameter=214.3 km assuming a 30% albedo -- 10.3 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 493480, (2018/02/15 14:31UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:09.0 -11:15:19  1.0 27.86 120
Denebola       11:49:59.0 +14:28:14  2.1  8.66 150
12 Vir         12:14:21.3 +10:09:41  5.8  2.98 144
PPM 128969     12:21:00.0 +13:45:15  7.8  1.95 143
PPM 129016     12:24:37.7 +11:49:12  9.7  0.20 141
493480         12:24:02.2 +11:57:11 14.0       141
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 493480, (2018/02/15 14:31UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 27.86 120
Denebola       11:49:03.0 +14:34:17  2.1  8.66 150
12 Vir         12:13:25.8 +10:15:44  5.8  2.98 144
PPM 128969     12:20:04.8 +13:51:17  7.8  1.95 143
PPM 129016     12:23:42.5 +11:55:13  9.7  0.20 141
493480         12:23:07.0 +12:03:13 14.0       142
Positions are for J2000

Event circumstances last updated at 2017/06/01 18:08:06 UT

Marc W. Buie, Southwest Research Institute

RECON