RECON: TNO occultation with 19521

Event between (19521) Chaos and star GA1200:01681001 with event index number of 353079

Geocentric closest approach at 2018/12/25 15:37:10 UTC

J2000 position of star is 05:31:20.3 +30:15:06
Equinox of date position of star is 05:32:32.7 +30:15:52
Stellar brightness G=14.7, use SENSEUP=128
Star is 50 degrees from the moon. Moon is 88% illuminated.
TNO apparent brightness V=20.9

TNO is 41.3 AU from the Sun and 40.3 AU from the Earth.
The TNO is moving 25.1 km/sec on the sky relative to the star, or, 3.1 arcsec/hr.
The 1-sigma error in the time of the event is 537 seconds.
The 1-sigma cross-track error in the shadow position is 3560 km.

The TNO has an absolute magnitude Hv=4.8
Diameter=660.7 km assuming a 5% albedo -- 26.4 sec chord
Diameter=269.7 km assuming a 30% albedo -- 10.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 19521, (2018/12/25 15:37UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:00.7 +16:32:45  0.8 18.69  64
Alnath         05:27:29.6 +28:37:18  1.6  1.98  51
25Chi Aur      05:33:57.9 +32:12:15  4.8  1.96  50
PPM 094418     05:31:18.8 +29:33:43  8.2  0.75  51
PPM 070490     05:32:26.5 +30:11:25 10.0  0.08  50
19521          05:32:33.3 +30:15:52 14.7        50
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 19521, (2018/12/25 15:37UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 18.69  64
Alnath         05:26:17.5 +28:36:23  1.6  1.98  51
25Chi Aur      05:32:43.7 +32:11:31  4.8  1.96  50
PPM 094418     05:30:06.1 +29:32:54  8.2  0.75  51
PPM 070490     05:31:13.5 +30:10:38 10.0  0.08  50
19521          05:31:20.3 +30:15:06 14.7        50
Positions are for J2000

Event circumstances last updated at 2018/10/23 20:47:46 UT

Marc W. Buie, Southwest Research Institute

RECON