RECON: TNO occultation with 143707

Event between (143707) 03UY117 and star GA1120:00495669 with event index number of 2468512

Geocentric closest approach at 2025/01/06 11:20:43 UTC

J2000 position of star is 03:52:23.0 +23:18:46
Equinox of date position of star is 03:53:48.8 +23:23:00
Stellar brightness G=16.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 51 degrees from the moon. Moon is 44% illuminated.
Apparent brightness V=21.5

Object is 35.4 AU from the Sun and 34.7 AU from the Earth.
Apparent velocity is 15.8 km/sec on the sky relative to the star, or, 2.3 arcsec/hr.
The 1-sigma error in the time of the event is 93 seconds.
The 1-sigma cross-track error in the shadow position is 1286 km.

The object has an absolute magnitude Hv=5.9
Diameter=378.5 km assuming a 5% albedo -- 24.8 sec chord
Diameter=154.5 km assuming a 30% albedo -- 10.1 sec chord
Dynamical classification is 5:2EEE
 
 
 
 
 
 
 
 

Star training set for 143707, (2025/01/06 11:20UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:21.5 +16:33:28  0.8 12.28  60
44Zet Per      03:55:42.7 +31:57:21  2.8  8.58  54
PPM 092951     03:51:12.9 +23:47:10  6.1  0.73  51
PPM 093052     03:56:13.8 +23:16:25  8.4  0.55  52
PPM 093026     03:54:50.3 +23:11:47  9.8  0.29  52
PPM 092991     03:53:04.2 +23:18:03 10.2  0.20  51
143707         03:53:52.2 +23:23:10 16.2        52
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 143707, (2025/01/06 11:20UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 12.28  60
44Zet Per      03:54:07.9 +31:53:01  2.8  8.58  54
PPM 092951     03:49:43.5 +23:42:42  6.1  0.73  51
PPM 093052     03:54:44.6 +23:12:06  8.4  0.55  52
PPM 093026     03:53:21.2 +23:07:25  9.8  0.29  52
PPM 092991     03:51:35.1 +23:13:38 10.2  0.20  51
143707         03:52:23.0 +23:18:46 16.2        51
Positions are for J2000

Event circumstances last updated at 2024/01/29 04:23:04 UT

Marc W. Buie, Southwest Research Institute

RECON