RECON: TNO occultation with 8405

Event between (8405) Asbolus and star GA1300:02890621 with event index number of 1147000

Geocentric closest approach at 2022/01/11 00:03:01 UTC

J2000 position of star is 05:33:00.5 +41:19:57
Equinox of date position of star is 05:34:33.5 +41:20:47
Stellar brightness G=16.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 53 degrees from the moon. Moon is 62% illuminated.
TNO apparent brightness V=22.9

TNO is 23.9 AU from the Sun and 23.1 AU from the Earth.
The TNO is moving 23.4 km/sec on the sky relative to the star, or, 5.0 arcsec/hr.
The 1-sigma error in the time of the event is 105 seconds.
The 1-sigma cross-track error in the shadow position is 917 km.

The TNO has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 3.9 sec chord
Diameter=37.2 km assuming a 30% albedo -- 1.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 8405, (2022/01/11 00:03UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:11.2 +16:33:07  0.8 27.70  35
34Bet Aur      06:01:08.7 +44:56:50  1.9  6.04  59
PPM 048174     05:32:22.2 +41:28:37  6.0  0.43  53
PPM 048232     05:35:50.3 +41:08:12  8.5  0.32  53
PPM 048212     05:34:42.8 +41:39:37  9.6  0.31  53
8405           05:34:34.0 +41:20:47 16.3        54
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, (2022/01/11 00:03UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 27.70  35
34Bet Aur      05:59:31.6 +44:56:51  1.9  6.04  59
PPM 048174     05:30:48.6 +41:27:43  6.0  0.43  53
PPM 048232     05:34:17.0 +41:07:24  8.5  0.32  53
PPM 048212     05:33:09.1 +41:38:47  9.6  0.31  53
8405           05:33:00.5 +41:19:57 16.3        53
Positions are for J2000

Event circumstances last updated at 2021/12/07 01:45:04 UT

Marc W. Buie, Southwest Research Institute

RECON