RECON: TNO occultation with 547617

Event between (547617) 10TT195 and star GA1140:00765408 with event index number of 2251453

Geocentric closest approach at 2026/08/28 02:55:13 UTC

J2000 position of star is 04:36:19.6 +25:14:07
Equinox of date position of star is 04:37:47.4 +25:16:57
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 97 degrees from the moon. Moon is 100% illuminated.
Apparent brightness V=22.5

Object is 42.9 AU from the Sun and 43.0 AU from the Earth.
Apparent velocity is 8.0 km/sec on the sky relative to the star, or, 0.9 arcsec/hr.
The 1-sigma error in the time of the event is 353 seconds.
The 1-sigma cross-track error in the shadow position is 2231 km.

The object has an absolute magnitude Hv=6.0
Diameter=378.5 km assuming a 5% albedo -- 48.6 sec chord
Diameter=154.5 km assuming a 30% albedo -- 19.9 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 547617, (2026/08/28 02:13UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:27.2 +16:33:39  0.8  8.73  96
3Iot Aur       04:58:44.0 +33:12:21  2.7  9.12 103
PPM 093661     04:41:00.9 +25:16:08  6.3  0.69  98
PPM 093640     04:39:02.7 +25:46:44  8.7  0.55  98
PPM 093623     04:37:39.7 +25:08:22 11.4  0.16  97
547617         04:37:57.3 +25:17:16 15.9        98
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 547617, (2026/08/28 02:13UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  8.73  96
3Iot Aur       04:56:59.6 +33:09:58  2.7  9.12 103
PPM 093661     04:39:23.2 +25:13:05  6.3  0.69  98
PPM 093640     04:37:24.7 +25:43:38  8.7  0.55  98
PPM 093623     04:36:02.1 +25:05:13 11.4  0.16  97
547617         04:36:19.6 +25:14:07 15.9        97
Positions are for J2000

Event circumstances last updated at 2023/12/16 05:31:51 UT

Marc W. Buie, Southwest Research Institute

RECON