RECON: TNO occultation with 8405

Event between (8405) Asbolus and star GA1300:03140510 with event index number of 1331022

Geocentric closest approach at 2024/03/13 01:16:43 UTC

J2000 position of star is 05:49:28.6 +41:02:02
Equinox of date position of star is 05:51:11.0 +41:02:22
Stellar brightness G=15.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 59 degrees from the moon. Moon is 10% illuminated.
Apparent brightness V=23.4

Object is 25.1 AU from the Sun and 25.0 AU from the Earth.
Apparent velocity is 8.9 km/sec on the sky relative to the star, or, 1.8 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 2817 km.

The object has an absolute magnitude Hv=9.2
Diameter=91.2 km assuming a 5% albedo -- 9.7 sec chord
Diameter=37.2 km assuming a 30% albedo -- 4.0 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 8405, (2024/03/13 01:17UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:47.7 +27:57:57  1.1 26.99  83
34Bet Aur      06:01:18.3 +44:56:50  1.9  4.32  61
PPM 048445     05:48:58.7 +42:32:00  6.3  1.55  59
PPM 048508     05:53:52.5 +40:58:01  8.2  0.51  59
PPM 048482     05:52:11.7 +40:52:22  9.3  0.25  59
PPM 048475     05:51:28.8 +40:58:25 10.1  0.09  59
8405           05:51:11.2 +41:02:22 15.0        59
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 8405, (2024/03/13 01:17UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 26.99  83
34Bet Aur      05:59:31.6 +44:56:51  1.9  4.32  61
PPM 048445     05:47:14.7 +42:31:34  6.3  1.55  59
PPM 048508     05:52:10.0 +40:57:46  8.2  0.51  59
PPM 048482     05:50:29.3 +40:52:04  9.3  0.25  59
PPM 048475     05:49:46.3 +40:58:05 10.1  0.09  59
8405           05:49:28.6 +41:02:02 15.0        59
Positions are for J2000

Event circumstances last updated at 2024/03/02 05:30:51 UT

Marc W. Buie, Southwest Research Institute

RECON