RECON: TNO occultation with 8405

Event between (8405) Asbolus and star GA1300:02515404 with event index number of 338298

Geocentric closest approach at 2019/12/18 23:36:48 UTC

J2000 position of star is 05:13:07.7 +40:52:50
Equinox of date position of star is 05:14:29.6 +40:54:08
Stellar brightness G=16.2, use SENSEUP=128
Star is 91 degrees from the moon. Moon is 53% illuminated.
TNO apparent brightness V=22.6

TNO is 22.6 AU from the Sun and 21.7 AU from the Earth.
The TNO is moving 25.7 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 118 seconds.
The 1-sigma cross-track error in the shadow position is 1104 km.

The TNO has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 3.5 sec chord
Diameter=37.2 km assuming a 30% albedo -- 1.4 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 8405, (2019/12/18 23:37UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:04.1 +16:32:52  0.8 25.66 104
3Iot Aur       04:58:17.8 +33:11:45  2.7  8.36  96
10Eta Aur      05:07:55.1 +41:15:34  3.2  1.30  93
PPM 047827     05:13:38.8 +41:14:16  7.7  0.37  91
PPM 047817     05:13:12.0 +40:58:08  9.8  0.26  92
PPM 047834     05:13:44.0 +40:43:35 10.6  0.23  92
8405           05:14:31.8 +40:54:10 16.2        91
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, (2019/12/18 23:37UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 25.66 104
3Iot Aur       04:56:59.6 +33:09:58  2.7  8.36  96
10Eta Aur      05:06:30.9 +41:14:03  3.2  1.30  93
PPM 047827     05:12:14.5 +41:12:54  7.7  0.37  91
PPM 047817     05:11:47.9 +40:56:45  9.8  0.26  92
PPM 047834     05:12:20.2 +40:42:14 10.6  0.23  92
8405           05:13:07.7 +40:52:50 16.2        91
Positions are for J2000

Event circumstances last updated at 2019/06/16 22:03:54 UT

Marc W. Buie, Southwest Research Institute

RECON