RECON: TNO occultation with 79983

Event between (79983) 99DF9 and star GA0820:04195772 with event index number of 2400709

Geocentric closest approach at 2022/05/23 12:16:34 UTC

J2000 position of star is 12:10:30.1 -06:50:45
Equinox of date position of star is 12:11:38.9 -06:58:12
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 154 degrees from the moon. Moon is 42% illuminated.
TNO apparent brightness V=22.3

TNO is 40.7 AU from the Sun and 40.1 AU from the Earth.
The TNO is moving 11.6 km/sec on the sky relative to the star, or, 1.4 arcsec/hr.
The 1-sigma error in the time of the event is 142 seconds.
The 1-sigma cross-track error in the shadow position is 1658 km.

The TNO has an absolute magnitude Hv=6.1
Diameter=361.4 km assuming a 5% albedo -- 31.3 sec chord
Diameter=147.5 km assuming a 30% albedo -- 12.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 79983, (2022/05/23 12:16UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:22.6 -11:16:39  1.0 18.93 137
4Gam Crv       12:16:57.7 -17:39:58  2.6 10.77 145
PPM 195089     12:04:00.5 -07:48:29  5.8  2.07 155
PPM 195183     12:09:44.2 -06:58:45  8.5  0.48 155
PPM 195213     12:11:24.3 -07:10:40  9.1  0.22 154
79983          12:11:39.1 -06:58:14 16.6       154
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 79983, (2022/05/23 12:16UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 18.93 137
4Gam Crv       12:15:48.1 -17:32:30  2.6 10.77 145
PPM 195089     12:02:51.6 -07:41:01  5.8  2.07 155
PPM 195183     12:08:35.2 -06:51:17  8.5  0.48 155
PPM 195213     12:10:15.3 -07:03:12  9.1  0.22 154
79983          12:10:30.1 -06:50:45 16.6       154
Positions are for J2000

Event circumstances last updated at 2022/05/03 00:32:04 UT

Marc W. Buie, Southwest Research Institute

RECON