RECON: TNO occultation with 160427

Event between (160427) 05RL43 and star GA1000:00682741 with event index number of 1967228

Geocentric closest approach at 2026/03/07 21:01:14 UTC

J2000 position of star is 05:13:12.4 +10:48:11
Equinox of date position of star is 05:14:32.1 +10:49:47
Stellar brightness G=15.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 137 degrees from the moon. Moon is 81% illuminated.
Apparent brightness V=22.1

Object is 24.8 AU from the Sun and 24.7 AU from the Earth.
Apparent velocity is 8.0 km/sec on the sky relative to the star, or, 1.6 arcsec/hr.
The 1-sigma error in the time of the event is 114 seconds.
The 1-sigma cross-track error in the shadow position is 1089 km.

The object has an absolute magnitude Hv=7.9
Diameter=155.6 km assuming a 5% albedo -- 19.3 sec chord
Diameter=63.5 km assuming a 30% albedo -- 7.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 160427, (2026/03/07 21:01UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:25.5 +16:33:36  0.8 10.70 147
Bellatrix      05:26:32.2 +06:22:16  1.6  5.34 133
18 Ori         05:17:31.5 +11:22:07  5.6  0.88 137
PPM 120707     05:13:47.8 +11:23:33  8.5  0.60 138
PPM 120727     05:14:50.3 +10:46:41  8.8  0.07 137
160427         05:14:39.4 +10:49:55 15.3       137
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 160427, (2026/03/07 21:01UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 10.70 147
Bellatrix      05:25:07.8 +06:20:58  1.6  5.34 133
18 Ori         05:16:04.1 +11:20:29  5.6  0.88 137
PPM 120707     05:12:20.4 +11:21:46  8.5  0.60 138
PPM 120727     05:13:23.3 +10:44:57  8.8  0.07 137
160427         05:13:12.4 +10:48:11 15.3       137
Positions are for J2000

Event circumstances last updated at 2023/12/23 04:17:32 UT

Marc W. Buie, Southwest Research Institute

RECON