RECON: TNO occultation with 118228

Event between (118228) 96TQ66 and star GA1240:01047878 with event index number of 229665

Geocentric closest approach at 2019/12/11 20:48:56 UTC

J2000 position of star is 04:14:06.9 +34:11:52
Equinox of date position of star is 04:15:21.1 +34:14:42
Stellar brightness G=15.8, use SENSEUP=128
Star is 17 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=22.4

TNO is 35.4 AU from the Sun and 34.5 AU from the Earth.
The TNO is moving 24.4 km/sec on the sky relative to the star, or, 3.5 arcsec/hr.
The 1-sigma error in the time of the event is 182 seconds.
The 1-sigma cross-track error in the shadow position is 2268 km.

The TNO has an absolute magnitude Hv=6.9
Diameter=251.2 km assuming a 5% albedo -- 10.3 sec chord
Diameter=102.6 km assuming a 30% albedo -- 4.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 118228, (2019/12/11 20:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:04.0 +16:32:52  0.8 18.35   6
44Zet Per      03:55:23.4 +31:56:29  2.8  4.78  18
PPM 069097     04:08:12.7 +33:29:55  6.4  1.67  17
PPM 069267     04:17:28.7 +34:55:01  7.6  0.79  17
PPM 069224     04:15:04.1 +34:17:32  9.7  0.08  17
118228         04:15:24.5 +34:14:49 15.8        16
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 118228, (2019/12/11 20:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 18.35   6
44Zet Per      03:54:07.9 +31:53:01  2.8  4.78  18
PPM 069097     04:06:55.8 +33:26:46  6.4  1.67  17
PPM 069267     04:16:10.7 +34:52:07  7.6  0.79  17
PPM 069224     04:13:46.5 +34:14:35  9.7  0.08  17
118228         04:14:06.9 +34:11:52 15.8        17
Positions are for J2000

Event circumstances last updated at 2019/01/30 20:42:15 UT

Marc W. Buie, Southwest Research Institute

RECON