RECON: TNO occultation with 517717

Event between (517717) 15KZ120 and star GA1560:03393681 with event index number of 1035963

Geocentric closest approach at 2021/01/18 23:41:11 UTC

J2000 position of star is 20:03:53.3 +67:51:51
Equinox of date position of star is 20:03:58.7 +67:55:27
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 83 degrees from the moon. Moon is 33% illuminated.
TNO apparent brightness V=20.2

TNO is 9.1 AU from the Sun and 9.1 AU from the Earth.
The TNO is moving 40.2 km/sec on the sky relative to the star, or, 21.9 arcsec/hr.
The 1-sigma error in the time of the event is 8 seconds.
The 1-sigma cross-track error in the shadow position is 330 km.

The TNO has an absolute magnitude Hv=10.1
Diameter=57.5 km assuming a 5% albedo -- 1.4 sec chord
Diameter=23.5 km assuming a 30% albedo -- 0.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 517717, (2021/01/18 23:41UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:09.0 +45:21:23  1.3 23.11  70
Alderamin      21:19:04.8 +62:40:31  2.4  9.38  74
PPM 022104     20:20:11.1 +68:56:52  5.5  1.81  82
PPM 021958     20:04:58.4 +68:05:16  8.1  0.19  83
517717         20:03:58.7 +67:55:28 15.9        83
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 517717, (2021/01/18 23:41UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 23.11  70
Alderamin      21:18:35.2 +62:35:09  2.4  9.38  74
PPM 022104     20:20:06.1 +68:52:50  5.5  1.81  82
PPM 021958     20:04:53.3 +68:01:38  8.1  0.19  83
517717         20:03:53.3 +67:51:51 15.9        83
Positions are for J2000

Event circumstances last updated at 2020/12/21 23:35:10 UT

Marc W. Buie, Southwest Research Institute

RECON