RECON: TNO occultation with 8405

Event between (8405) Asbolus and star GA1300:02161201 with event index number of 338158

Geocentric closest approach at 2019/01/01 15:59:33 UTC

J2000 position of star is 04:57:14.0 +40:20:21
Equinox of date position of star is 04:58:32.9 +40:22:03
Stellar brightness G=16.3, use SENSEUP=128
Star is 146 degrees from the moon. Moon is 18% illuminated.
TNO apparent brightness V=22.6

TNO is 21.9 AU from the Sun and 21.1 AU from the Earth.
The TNO is moving 23.5 km/sec on the sky relative to the star, or, 5.5 arcsec/hr.
The 1-sigma error in the time of the event is 118 seconds.
The 1-sigma cross-track error in the shadow position is 1060 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, (2019/01/01 16:00UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:00.8 +16:32:46  0.8 24.27 161
3Iot Aur       04:58:14.0 +33:11:40  2.7  7.17 150
5 Aur          05:01:36.9 +39:25:18  6.4  1.11 146
PPM 047520     04:57:50.5 +40:11:52  8.0  0.22 146
PPM 047532     04:58:33.1 +40:32:00  9.7  0.17 145
8405           04:58:33.2 +40:22:03 16.3       145
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, (2019/01/01 16:00UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 24.27 161
3Iot Aur       04:56:59.6 +33:09:58  2.7  7.17 150
5 Aur          05:00:18.3 +39:23:41  6.4  1.11 146
PPM 047520     04:56:31.4 +40:10:09  8.0  0.22 146
PPM 047532     04:57:13.8 +40:30:18  9.7  0.17 145
8405           04:57:14.0 +40:20:21 16.3       146
Positions are for J2000

Event circumstances last updated at 2018/12/04 05:05:10 UT

Marc W. Buie, Southwest Research Institute

RECON