RECON: TNO occultation with 471172

Event between (471172) 10JC80 and star GA0640:18623099 with event index number of 2240182

Geocentric closest approach at 2027/06/05 01:51:36 UTC

J2000 position of star is 17:42:15.9 -25:13:00
Equinox of date position of star is 17:43:46.5 -25:13:37
Stellar brightness G=15.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 172 degrees from the moon. Moon is 0% illuminated.
Apparent brightness V=21.1

Object is 31.5 AU from the Sun and 30.5 AU from the Earth.
Apparent velocity is 22.3 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 236 seconds.
The 1-sigma cross-track error in the shadow position is 1275 km.

The object has an absolute magnitude Hv=6.1
Diameter=358.1 km assuming a 5% albedo -- 16.1 sec chord
Diameter=146.2 km assuming a 30% albedo -- 6.6 sec chord
Dynamical classification is 5:2EEE
 
 
 
 
 
 
 
 

Star training set for 471172, (2027/06/05 01:52UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:05.6 -26:29:25  0.9 16.43 172
35Eta Oph      17:11:57.2 -15:45:25  2.6 12.07 169
PPM 266967     17:33:26.7 -26:17:17  6.3  2.59 174
PPM 267199     17:45:39.2 -26:19:01  8.5  1.15 171
PPM 267152     17:43:24.9 -25:16:47  9.3  0.13 172
471172         17:43:57.5 -25:13:41 15.5       171
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 471172, (2027/06/05 01:52UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 16.43 172
35Eta Oph      17:10:22.7 -15:43:29  2.6 12.07 169
PPM 266967     17:31:44.4 -26:16:11  6.3  2.59 174
PPM 267199     17:43:56.8 -26:18:25  8.5  1.15 171
PPM 267152     17:41:43.3 -25:16:05  9.3  0.13 172
471172         17:42:15.9 -25:13:00 15.5       171
Positions are for J2000

Event circumstances last updated at 2024/06/21 21:28:39 UT

Marc W. Buie, Southwest Research Institute

RECON