RECON: TNO occultation with 120216

Event between (120216) 04EW95 and star GA0460:13842548 with event index number of 2140144

Geocentric closest approach at 2026/03/20 02:47:14 UTC

J2000 position of star is 16:25:22.2 -43:26:29
Equinox of date position of star is 16:27:01.8 -43:29:36
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 120 degrees from the moon. Moon is 2% illuminated.
Apparent brightness V=21.2

Object is 27.5 AU from the Sun and 27.2 AU from the Earth.
Apparent velocity is 12.9 km/sec on the sky relative to the star, or, 2.4 arcsec/hr.
The 1-sigma error in the time of the event is 170 seconds.
The 1-sigma cross-track error in the shadow position is 3054 km.

The object has an absolute magnitude Hv=6.6
Diameter=287.1 km assuming a 5% albedo -- 22.5 sec chord
Diameter=117.2 km assuming a 30% albedo -- 9.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 120216, (2026/03/20 02:47UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:01.2 -26:29:16  0.9 17.03 124
Eta Lup        16:01:52.1 -38:28:09  2.8  6.94 127
PPM 321643     16:24:20.5 -43:58:18  5.8  0.70 121
PPM 321669     16:26:09.8 -43:47:18  8.4  0.35 120
PPM 321691     16:27:04.7 -43:22:00  8.8  0.14 120
120216         16:27:13.3 -43:29:58 16.7       120
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 120216, (2026/03/20 02:47UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 17.03 124
Eta Lup        16:00:07.3 -38:23:48  2.8  6.94 127
PPM 321643     16:22:29.1 -43:54:43  5.8  0.70 121
PPM 321669     16:24:18.5 -43:43:47  8.4  0.35 120
PPM 321691     16:25:13.8 -43:18:31  8.8  0.14 120
120216         16:25:22.2 -43:26:29 16.7       120
Positions are for J2000

Event circumstances last updated at 2023/07/05 02:43:58 UT

Marc W. Buie, Southwest Research Institute

RECON