RECON: TNO occultation with 60558

Event between (60558) Echeclus and star UC4-537-008031 with event index number of 132311

Geocentric closest approach at 2018/08/06 06:40:00 UTC

J2000 position of star is 04:12:22.7 +17:18:32
Equinox of date position of star is 04:13:23.3 +17:21:11
Stellar brightness R=15.2, use SENSEUP=128
Star is 2 degrees from the moon. Moon is 34% illuminated.
TNO apparent brightness V=19.1

TNO is 7.9 AU from the Sun and 8.2 AU from the Earth.
The TNO is moving 20.6 km/sec on the sky relative to the star, or, 12.4 arcsec/hr.
The 1-sigma error in the time of the event is 15 seconds.
The 1-sigma cross-track error in the shadow position is 299 km.

The TNO has an absolute magnitude Hv=9.5
Diameter=75.9 km assuming a 5% albedo -- 3.7 sec chord
Diameter=31.0 km assuming a 30% albedo -- 1.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 60558, (2018/08/06 06:40UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:36:59.4 +16:32:43  0.8  5.69   7
44Zet Per      03:55:18.3 +31:56:15  2.8 15.15  16
48 Tau         04:16:49.8 +15:26:45  6.5  2.08   2
PPM 119695     04:13:35.5 +17:19:25  7.1  0.05   2
60558          04:13:26.8 +17:21:20 15.2         2
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 60558, (2018/08/06 06:40UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8  5.69   7
44Zet Per      03:54:07.9 +31:53:01  2.8 15.15  16
48 Tau         04:15:46.4 +15:24:02  6.5  2.08   2
PPM 119695     04:12:31.4 +17:16:37  7.1  0.05   2
60558          04:12:22.7 +17:18:32 15.2         2
Positions are for J2000

Event circumstances last updated at 2017/08/02 16:55:33 UT

Marc W. Buie, Southwest Research Institute

RECON