RECON: TNO occultation with 60558

Event between (60558) Echeclus and star GA1080:00868641 with event index number of 225272

Geocentric closest approach at 2019/11/16 15:08:22 UTC

J2000 position of star is 05:11:49.4 +18:10:56
Equinox of date position of star is 05:12:59.0 +18:12:18
Stellar brightness G=13.5, use SENSEUP=32
Star is 25 degrees from the moon. Moon is 83% illuminated.
TNO apparent brightness V=19.2

TNO is 9.2 AU from the Sun and 8.3 AU from the Earth.
The TNO is moving 18.3 km/sec on the sky relative to the star, or, 11.0 arcsec/hr.
The 1-sigma error in the time of the event is 18 seconds.
The 1-sigma cross-track error in the shadow position is 301 km.

The TNO has an absolute magnitude Hv=9.5
Diameter=75.9 km assuming a 5% albedo -- 4.1 sec chord
Diameter=31.0 km assuming a 30% albedo -- 1.7 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 60558, (2019/11/16 15:08UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:03.8 +16:32:52  0.8  8.73  33
Alnath         05:27:33.0 +28:37:20  1.6 10.94  21
104 Tau        05:08:37.6 +18:40:13  5.6  1.13  26
PPM 120670     05:11:49.2 +17:27:48  7.7  0.79  25
PPM 120718     05:14:01.0 +18:10:38  8.9  0.25  24
PPM 120709     05:13:30.9 +18:04:35 10.7  0.18  25
60558          05:12:59.0 +18:12:18 13.5        24
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, (2019/11/16 15:08UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8  8.73  33
Alnath         05:26:17.5 +28:36:23  1.6 10.94  21
104 Tau        05:07:27.7 +18:38:43  5.6  1.13  26
PPM 120670     05:10:39.9 +17:26:24  7.7  0.79  25
PPM 120718     05:12:51.4 +18:09:17  8.9  0.25  24
PPM 120709     05:12:21.3 +18:03:14 10.7  0.18  25
60558          05:11:49.4 +18:10:56 13.5        25
Positions are for J2000

Event circumstances last updated at 2019/11/15 22:21:22 UT

Marc W. Buie, Southwest Research Institute

RECON