RECON: TNO occultation with 612243

Event between (612243) 01QR322 and star GA1060:00386409 with event index number of 2811938

Geocentric closest approach at 2027/11/23 13:04:13 UTC

J2000 position of star is 03:30:12.8 +17:35:40
Equinox of date position of star is 03:31:34.4 +17:40:30
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 129 degrees from the moon. Moon is 23% illuminated.
Apparent brightness V=22.9

Object is 30.4 AU from the Sun and 29.4 AU from the Earth.
Apparent velocity is 24.6 km/sec on the sky relative to the star, or, 4.1 arcsec/hr.
The 1-sigma error in the time of the event is 290 seconds.
The 1-sigma cross-track error in the shadow position is 2221 km.

The object has an absolute magnitude Hv=8.1
Diameter=143.2 km assuming a 5% albedo -- 5.9 sec chord
Diameter=58.5 km assuming a 30% albedo -- 2.4 sec chord
Dynamical classification is 1:1
 
 
 
 
 
 
 
 

Star training set for 612243, (2027/11/23 12:58UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:31.5 +16:33:48  0.8 15.74 113
Menkar         03:03:44.5 +04:11:51  2.5 15.14 136
PPM 119253     03:41:00.7 +16:37:31  6.2  2.44 127
PPM 119148     03:32:56.5 +18:01:54  8.3  0.44 128
PPM 119147     03:32:50.6 +17:38:13  9.7  0.25 128
PPM 119124     03:31:36.0 +17:40:42 10.3  0.05 129
612243         03:31:48.0 +17:41:18 16.6       128
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 612243, (2027/11/23 12:58UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 15.74 113
Menkar         03:02:16.8 +04:05:21  2.5 15.14 136
PPM 119253     03:39:25.8 +16:32:11  6.2  2.44 127
PPM 119148     03:31:21.1 +17:56:18  8.3  0.44 128
PPM 119147     03:31:15.4 +17:32:37  9.7  0.25 128
PPM 119124     03:30:00.8 +17:35:04 10.3  0.05 129
612243         03:30:12.8 +17:35:40 16.6       129
Positions are for J2000

Event circumstances last updated at 2023/11/28 04:18:30 UT

Marc W. Buie, Southwest Research Institute

RECON