RECON: TNO occultation with 310071

Event between (310071) 10KR59 and star GA0560:13312322 with event index number of 2187607

Geocentric closest approach at 2026/04/16 23:29:08 UTC

J2000 position of star is 16:55:55.1 -32:21:22
Equinox of date position of star is 16:57:29.1 -32:23:34
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 124 degrees from the moon. Moon is 0% illuminated.
Apparent brightness V=21.5

Object is 22.7 AU from the Sun and 22.1 AU from the Earth.
Apparent velocity is 14.4 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 102 seconds.
The 1-sigma cross-track error in the shadow position is 1116 km.

The object has an absolute magnitude Hv=7.8
Diameter=163.7 km assuming a 5% albedo -- 11.3 sec chord
Diameter=66.8 km assuming a 30% albedo -- 4.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 310071, (2026/04/16 23:28UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:01.4 -26:29:17  0.9  8.27 130
26Eps Sco      16:51:52.5 -34:20:17  2.3  2.28 125
27 Sco         16:58:54.3 -33:17:55  5.2  0.94 123
PPM 295658     16:57:10.4 -32:32:37  7.4  0.18 124
PPM 295665     16:57:20.8 -32:13:49 10.2  0.18 124
310071         16:57:37.4 -32:23:46 16.0       123
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 310071, (2026/04/16 23:28UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  8.27 130
26Eps Sco      16:50:08.8 -34:17:41  2.3  2.28 125
27 Sco         16:57:11.2 -33:15:35  5.2  0.94 123
PPM 295658     16:55:28.0 -32:30:13  7.4  0.18 124
PPM 295665     16:55:38.7 -32:11:25 10.2  0.18 124
310071         16:55:55.1 -32:21:22 16.0       124
Positions are for J2000

Event circumstances last updated at 2024/03/04 05:51:42 UT

Marc W. Buie, Southwest Research Institute

RECON