RECON: TNO occultation with 547375

Event between (547375) 10PC88 and star GA0900:00315574 with event index number of 2136714

Geocentric closest approach at 2026/10/12 00:15:37 UTC

J2000 position of star is 03:41:13.2 +00:48:37
Equinox of date position of star is 03:42:27.5 +00:53:10
Stellar brightness G=15.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 151 degrees from the moon. Moon is 2% illuminated.
Apparent brightness V=22.2

Object is 26.8 AU from the Sun and 26.0 AU from the Earth.
Apparent velocity is 19.8 km/sec on the sky relative to the star, or, 3.8 arcsec/hr.
The 1-sigma error in the time of the event is 106 seconds.
The 1-sigma cross-track error in the shadow position is 1319 km.

The object has an absolute magnitude Hv=7.8
Diameter=162.9 km assuming a 5% albedo -- 8.5 sec chord
Diameter=66.5 km assuming a 30% albedo -- 3.5 sec chord
Dynamical classification is CENTAURS
 
 
 
 
 
 
 
 

Star training set for 547375, (2026/10/12 00:16UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:27.6 +16:33:40  0.8 20.69 144
Menkar         03:03:41.0 +04:11:36  2.5 10.26 160
10 Tau         03:38:14.6 +00:29:08  4.3  1.16 151
PPM 146746     03:39:12.8 +00:13:38  7.6  1.08 151
PPM 146766     03:40:21.6 +00:52:55  9.1  0.56 151
PPM 146824     03:43:00.0 +01:11:47 10.9  0.32 151
547375         03:42:36.0 +00:53:42 15.5       150
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 547375, (2026/10/12 00:16UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 20.69 144
Menkar         03:02:16.8 +04:05:21  2.5 10.26 160
10 Tau         03:36:52.0 +00:23:56  4.3  1.16 151
PPM 146746     03:37:50.4 +00:08:27  7.6  1.08 151
PPM 146766     03:38:58.8 +00:47:46  9.1  0.56 151
PPM 146824     03:41:37.0 +01:06:43 10.9  0.32 151
547375         03:41:13.2 +00:48:37 15.5       151
Positions are for J2000

Event circumstances last updated at 2024/01/09 04:30:07 UT

Marc W. Buie, Southwest Research Institute

RECON