RECON: TNO occultation with 120061

Event between (120061) 03CO1 and star UC4-283-217187 with event index number of 131129

Geocentric closest approach at 2018/07/12 03:30:04 UTC

J2000 position of star is 19:49:55.9 -33:26:44
Equinox of date position of star is 19:51:05.0 -33:23:57
Stellar brightness R=14.7, use SENSEUP=128
Star is 157 degrees from the moon. Moon is 2% illuminated.
TNO apparent brightness V=21.3

TNO is 17.5 AU from the Sun and 16.5 AU from the Earth.
The TNO is moving 22.8 km/sec on the sky relative to the star, or, 6.9 arcsec/hr.
The 1-sigma error in the time of the event is 442 seconds.
The 1-sigma cross-track error in the shadow position is 2611 km.

The TNO has an absolute magnitude Hv=8.9
Diameter=100.0 km assuming a 5% albedo -- 4.4 sec chord
Diameter=40.8 km assuming a 30% albedo -- 1.8 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 120061, (2018/07/12 03:30UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:40.2 -29:31:25  1.2 39.85 119
38Zet Sgr      19:03:47.3 -29:51:08  2.7 10.67 168
PPM 299365     19:47:12.0 -31:51:45  5.5  1.74 159
PPM 299417     19:50:26.9 -32:55:17  8.3  0.50 158
PPM 299439     19:51:31.8 -33:29:40  9.7  0.13 157
PPM 299422     19:50:41.7 -33:22:50 10.2  0.09 157
120061         19:51:07.3 -33:23:52 14.7       157
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 120061, (2018/07/12 03:30UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.5 -29:37:23  1.2 39.85 119
38Zet Sgr      19:02:36.7 -29:52:49  2.7 10.67 168
PPM 299365     19:46:01.2 -31:54:31  5.5  1.74 159
PPM 299417     19:49:15.7 -32:58:08  8.3  0.50 158
PPM 299439     19:50:20.3 -33:32:33  9.7  0.13 157
PPM 299422     19:49:30.3 -33:25:42 10.2  0.09 157
120061         19:49:55.9 -33:26:44 14.7       157
Positions are for J2000

Event circumstances last updated at 2017/12/04 18:50:29 UT

Marc W. Buie, Southwest Research Institute

RECON