RECON: TNO occultation with 60558

Event between (60558) Echeclus and star GA1080:01662893 with event index number of 313726

Geocentric closest approach at 2020/09/29 18:25:47 UTC

J2000 position of star is 06:06:48.2 +19:01:47
Equinox of date position of star is 06:08:01.2 +19:01:34
Stellar brightness G=16.5, use SENSEUP=128
Star is 107 degrees from the moon. Moon is 96% illuminated.
TNO apparent brightness V=20.4

TNO is 10.0 AU from the Sun and 9.9 AU from the Earth.
The TNO is moving 5.5 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 69 seconds.
The 1-sigma cross-track error in the shadow position is 363 km.

The TNO has an absolute magnitude Hv=10.0
Diameter=75.9 km assuming a 5% albedo -- 11.1 sec chord
Diameter=31.0 km assuming a 30% albedo -- 4.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 60558, (2020/09/29 18:26UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:17.7 +07:24:33  0.4 11.96 103
Alhena         06:38:54.6 +16:22:47  1.9  7.82 114
64 Ori         06:04:41.0 +19:41:19  4.9  1.03 107
PPM 121943     06:08:51.1 +18:54:31  7.8  0.23 108
60558          06:08:01.5 +19:01:34 16.5       108
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, (2020/09/29 18:26UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 11.96 103
Alhena         06:37:42.8 +16:23:57  1.9  7.82 114
64 Ori         06:03:27.3 +19:41:26  4.9  1.03 107
PPM 121943     06:07:37.8 +18:54:46  7.8  0.23 108
60558          06:06:48.2 +19:01:47 16.5       107
Positions are for J2000

Event circumstances last updated at 2020/08/28 21:28:25 UT

Marc W. Buie, Southwest Research Institute

RECON