RECON: TNO occultation with 12JD68

Event between 12JD68 and star GA0940:04698072 with event index number of 1557515

Geocentric closest approach at 2021/05/16 13:17:54 UTC

J2000 position of star is 17:06:37.0 +05:36:31
Equinox of date position of star is 17:07:39.8 +05:34:53
Stellar brightness G=13.9, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 135 degrees from the moon. Moon is 19% illuminated.
TNO apparent brightness V=22.6

TNO is 28.0 AU from the Sun and 27.1 AU from the Earth.
The TNO is moving 22.2 km/sec on the sky relative to the star, or, 4.1 arcsec/hr.
The 1-sigma error in the time of the event is 124 seconds.
The 1-sigma cross-track error in the shadow position is 1680 km.

The TNO has an absolute magnitude Hv=8.1
Diameter=141.3 km assuming a 5% albedo -- 6.4 sec chord
Diameter=57.7 km assuming a 30% albedo -- 2.6 sec chord
Dynamical classification is 3:2E+6:4II
 
 
 
 
 
 
 
 

Star training set for 12JD68, (2021/05/16 13:18UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.3 -26:28:39  0.9 33.28 142
60Bet Oph      17:44:31.8 +04:33:36  2.8  9.24 142
PPM 163642     17:12:47.1 +07:52:13  6.3  2.62 134
PPM 163576     17:09:24.9 +04:23:49  7.5  1.26 136
PPM 163552     17:08:17.0 +05:21:32  9.8  0.27 135
PPM 163551     17:08:16.2 +05:48:02 11.2  0.27 135
12JD68         17:07:40.0 +05:34:53 13.9       135
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 12JD68, (2021/05/16 13:18UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 33.28 142
60Bet Oph      17:43:28.3 +04:34:06  2.8  9.24 142
PPM 163642     17:11:45.3 +07:53:41  6.3  2.62 134
PPM 163576     17:08:21.4 +04:25:24  7.5  1.26 136
PPM 163552     17:07:13.9 +05:23:09  9.8  0.27 135
PPM 163551     17:07:13.3 +05:49:39 11.2  0.27 135
12JD68         17:06:37.0 +05:36:31 13.9       135
Positions are for J2000

Event circumstances last updated at 2021/04/21 22:32:26 UT

Marc W. Buie, Southwest Research Institute

RECON