RECON: TNO occultation with 506439

Event between (506439) 00YB2 and star GA1100:01570908 with event index number of 2258008

Geocentric closest approach at 2021/11/08 22:15:47 UTC

J2000 position of star is 05:55:02.4 +20:33:01
Equinox of date position of star is 05:56:20.3 +20:33:09
Stellar brightness G=15.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 165 degrees from the moon. Moon is 22% illuminated.
TNO apparent brightness V=22.7

TNO is 39.1 AU from the Sun and 38.3 AU from the Earth.
The TNO is moving 17.8 km/sec on the sky relative to the star, or, 2.3 arcsec/hr.
The 1-sigma error in the time of the event is 504 seconds.
The 1-sigma cross-track error in the shadow position is 2095 km.

The TNO has an absolute magnitude Hv=6.7
Diameter=275.4 km assuming a 5% albedo -- 15.5 sec chord
Diameter=112.4 km assuming a 30% albedo -- 6.3 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 506439, (2021/11/08 22:16UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:21.3 +07:24:34  0.4 13.14 156
Alnath         05:27:40.5 +28:37:26  1.6 10.37 160
54Chi1Ori      05:55:40.7 +20:16:42  5.1  0.32 164
PPM 095075     05:56:32.7 +21:04:46  8.5  0.53 165
PPM 095074     05:56:32.0 +20:27:14  8.7  0.11 165
506439         05:56:20.6 +20:33:09 15.5       165
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 506439, (2021/11/08 22:16UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 13.14 156
Alnath         05:26:17.6 +28:36:23  1.6 10.37 160
54Chi1Ori      05:54:22.7 +20:16:32  5.1  0.32 164
PPM 095075     05:55:14.3 +21:04:38  8.5  0.53 165
PPM 095074     05:55:13.9 +20:27:07  8.7  0.11 165
506439         05:55:02.4 +20:33:01 15.5       165
Positions are for J2000

Event circumstances last updated at 2021/10/11 01:42:33 UT

Marc W. Buie, Southwest Research Institute

RECON