RECON: TNO occultation with 517717

Event between (517717) 15KZ120 and star GA1620:02547095 with event index number of 2627047

Geocentric closest approach at 2022/01/31 21:29:08 UTC

J2000 position of star is 23:29:17.9 +72:52:22
Equinox of date position of star is 23:30:12.7 +72:59:37
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 100 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=20.5

TNO is 10.1 AU from the Sun and 10.0 AU from the Earth.
The TNO is moving 37.6 km/sec on the sky relative to the star, or, 18.7 arcsec/hr.
The 1-sigma error in the time of the event is 24 seconds.
The 1-sigma cross-track error in the shadow position is 624 km.

The TNO has an absolute magnitude Hv=10.1
Diameter=57.5 km assuming a 5% albedo -- 1.5 sec chord
Diameter=23.5 km assuming a 30% albedo -- 0.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 517717, (2022/01/31 21:29UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:42:11.1 +45:21:37  1.3 33.58  68
Caph           00:10:22.2 +59:16:17  2.3 14.27  92
PPM 011553     23:15:24.8 +74:21:06  5.7  1.71 100
PPM 011678     23:35:05.5 +73:02:12  7.7  0.36 100
PPM 011655     23:31:17.7 +72:55:46  9.3  0.10 100
517717         23:30:13.1 +72:59:40 15.9       100
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, (2022/01/31 21:29UT)
Object            RA         Dec     mag  sep  mel
Deneb          20:41:25.9 +45:16:49  1.3 33.58  68
Caph           00:09:12.2 +59:08:55  2.3 14.27  92
PPM 011553     23:14:37.4 +74:13:52  5.7  1.71 100
PPM 011678     23:34:08.3 +72:54:52  7.7  0.36 100
PPM 011655     23:30:22.0 +72:48:27  9.3  0.10 100
517717         23:29:17.9 +72:52:22 15.9       100
Positions are for J2000

Event circumstances last updated at 2021/12/06 01:46:04 UT

Marc W. Buie, Southwest Research Institute

RECON