RECON: TNO occultation with 8405

Event between (8405) Asbolus and star UC4-653-026790 with event index number of 172043

Geocentric closest approach at 2018/12/21 19:48:36 UTC

J2000 position of star is 04:59:22.2 +40:25:32
Equinox of date position of star is 05:00:35.7 +40:27:03
Stellar brightness R=15.9, use SENSEUP=128
Star is 21 degrees from the moon. Moon is 99% illuminated.
TNO apparent brightness V=22.5

TNO is 21.9 AU from the Sun and 21.0 AU from the Earth.
The TNO is moving 25.1 km/sec on the sky relative to the star, or, 5.9 arcsec/hr.
The 1-sigma error in the time of the event is 120 seconds.
The 1-sigma cross-track error in the shadow position is 1224 km.

The TNO has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 3.6 sec chord
Diameter=37.2 km assuming a 30% albedo -- 1.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 8405, (2018/12/21 19:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:00.7 +16:32:46  0.8 24.45   8
3Iot Aur       04:58:13.9 +33:11:40  2.7  7.27  14
8Zet Aur       05:03:48.5 +41:06:06  3.8  0.88  22
PPM 047586     05:01:38.5 +40:21:29  8.1  0.20  21
8405           05:00:41.4 +40:27:10 15.9        21
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, (2018/12/21 19:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 24.45   8
3Iot Aur       04:56:59.6 +33:09:58  2.7  7.27  14
8Zet Aur       05:02:28.7 +41:04:33  3.8  0.88  22
PPM 047586     05:00:19.4 +40:19:52  8.1  0.20  21
8405           04:59:22.2 +40:25:32 15.9        21
Positions are for J2000

Event circumstances last updated at 2017/08/03 16:27:17 UT

Marc W. Buie, Southwest Research Institute

RECON