RECON: TNO occultation with 386968

Event between (386968) 12BR61 and star GA0640:21962400 with event index number of 2215310

Geocentric closest approach at 2027/07/28 14:50:13 UTC

J2000 position of star is 18:01:38.8 -25:25:31
Equinox of date position of star is 18:03:08.5 -25:25:26
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 149 degrees from the moon. Moon is 30% illuminated.
Apparent brightness V=21.7

Object is 17.0 AU from the Sun and 16.1 AU from the Earth.
Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 5.1 arcsec/hr.
The 1-sigma error in the time of the event is 68 seconds.
The 1-sigma cross-track error in the shadow position is 585 km.

The object has an absolute magnitude Hv=9.3
Diameter=82.8 km assuming a 5% albedo -- 5.0 sec chord
Diameter=33.8 km assuming a 30% albedo -- 2.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 386968, (2027/07/28 14:51UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:06.2 -26:29:26  0.9 20.74 169
Nunki          18:56:58.4 -26:15:35  2.0 12.09 137
PPM 267497     17:56:36.0 -24:53:24  6.4  1.62 150
PPM 267715     18:04:01.7 -24:52:02  8.3  0.58 149
PPM 267703     18:03:29.3 -25:37:29  9.5  0.20 149
386968         18:03:21.1 -25:25:25 16.6       148
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 386968, (2027/07/28 14:51UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 20.74 169
Nunki          18:55:15.9 -26:17:49  2.0 12.09 137
PPM 267497     17:54:54.1 -24:53:13  6.4  1.62 150
PPM 267715     18:02:19.8 -24:52:10  8.3  0.58 149
PPM 267703     18:01:46.9 -25:37:36  9.5  0.20 149
386968         18:01:38.8 -25:25:31 16.6       149
Positions are for J2000

Event circumstances last updated at 2024/03/06 04:28:59 UT

Marc W. Buie, Southwest Research Institute

RECON