RECON: TNO occultation with 26181

Event between (26181) 96GQ21 and star GA0780:05568406 with event index number of 1906178

Geocentric closest approach at 2028/06/20 12:42:10 UTC

J2000 position of star is 16:51:32.5 -10:41:19
Equinox of date position of star is 16:52:53.7 -10:43:42
Stellar brightness G=15.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 160 degrees from the moon. Moon is 6% illuminated.
Apparent brightness V=21.6

Object is 48.0 AU from the Sun and 47.1 AU from the Earth.
Apparent velocity is 23.4 km/sec on the sky relative to the star, or, 2.5 arcsec/hr.
The 1-sigma error in the time of the event is 110 seconds.
The 1-sigma cross-track error in the shadow position is 1709 km.

The object has an absolute magnitude Hv=4.8
Diameter=625.2 km assuming a 5% albedo -- 27.6 sec chord
Diameter=255.2 km assuming a 30% albedo -- 11.3 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 26181, (2028/06/20 12:41UT)
Object            RA         Dec     mag  sep  mel
Antares        16:31:09.5 -26:29:33  0.9 16.59 171
13Zet Oph      16:38:43.8 -10:37:21  2.6  3.54 163
20 Oph         16:51:24.6 -10:49:51  4.6  0.43 161
PPM 232273     16:54:45.8 -11:43:03  8.5  1.06 161
PPM 232245     16:53:26.2 -10:40:28  9.1  0.10 160
26181          16:53:07.0 -10:44:05 15.4       160
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 26181, (2028/06/20 12:41UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 16.59 171
13Zet Oph      16:37:09.6 -10:34:01  2.6  3.54 163
20 Oph         16:49:50.2 -10:47:01  4.6  0.43 161
PPM 232273     16:53:10.7 -11:40:21  8.5  1.06 161
PPM 232245     16:51:51.8 -10:37:43  9.1  0.10 160
26181          16:51:32.5 -10:41:19 15.4       160
Positions are for J2000

Event circumstances last updated at 2024/06/24 21:30:03 UT

Marc W. Buie, Southwest Research Institute

RECON