RECON: TNO occultation with 508869

Event between (508869) 02VT130 and star GA1140:01355465 with event index number of 1126109

Geocentric closest approach at 2021/09/09 23:44:29 UTC

J2000 position of star is 05:38:44.4 +24:26:38
Equinox of date position of star is 05:40:04.1 +24:27:17
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 121 degrees from the moon. Moon is 11% illuminated.
TNO apparent brightness V=22.2

TNO is 43.2 AU from the Sun and 43.3 AU from the Earth.
The TNO is moving 8.1 km/sec on the sky relative to the star, or, 0.9 arcsec/hr.
The 1-sigma error in the time of the event is 524 seconds.
The 1-sigma cross-track error in the shadow position is 1880 km.

The TNO has an absolute magnitude Hv=5.7
Diameter=436.5 km assuming a 5% albedo -- 53.6 sec chord
Diameter=178.2 km assuming a 30% albedo -- 21.9 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 508869, (2021/09/09 23:44UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:10.1 +16:33:04  0.8 16.70 137
Alnath         05:27:39.9 +28:37:25  1.6  5.01 123
PPM 094690     05:43:14.0 +23:20:07  6.5  1.33 120
PPM 094629     05:41:11.2 +24:14:09  7.4  0.34 121
PPM 094595     05:39:27.2 +24:19:33  9.2  0.19 121
PPM 094607     05:40:07.4 +24:18:14 10.5  0.15 121
508869         05:40:04.2 +24:27:17 16.9       121
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 508869, (2021/09/09 23:44UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 16.70 137
Alnath         05:26:17.5 +28:36:23  1.6  5.01 123
PPM 094690     05:41:54.8 +23:19:34  6.5  1.33 120
PPM 094629     05:39:51.5 +24:13:32  7.4  0.34 121
PPM 094595     05:38:07.4 +24:18:53  9.2  0.19 121
PPM 094607     05:38:47.7 +24:17:35 10.5  0.15 121
508869         05:38:44.4 +24:26:38 16.9       121
Positions are for J2000

Event circumstances last updated at 2021/08/29 01:39:14 UT

Marc W. Buie, Southwest Research Institute

RECON