RECON: TNO occultation with 42355

Event between (42355) Typhon and star GA0720:05264416 with event index number of 240627

Geocentric closest approach at 2020/01/18 22:33:26 UTC

J2000 position of star is 14:38:37.8 -17:21:10
Equinox of date position of star is 14:39:42.8 -17:26:09
Stellar brightness G=14.7, use SENSEUP=128
Star is 7 degrees from the moon. Moon is 35% illuminated.
TNO apparent brightness V=21.4

TNO is 22.6 AU from the Sun and 22.9 AU from the Earth.
The TNO is moving 14.5 km/sec on the sky relative to the star, or, 3.2 arcsec/hr.
The 1-sigma error in the time of the event is 142 seconds.
The 1-sigma cross-track error in the shadow position is 1455 km.

The TNO has an absolute magnitude Hv=7.6
Diameter=182.0 km assuming a 5% albedo -- 12.5 sec chord
Diameter=74.3 km assuming a 30% albedo -- 5.1 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 42355, (2020/01/18 22:33UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:15.1 -11:15:55  1.0 18.83  23
27Bet Lib      15:18:05.3 -09:27:20  2.6 12.27   5
5 Lib          14:47:04.3 -15:32:34  6.5  2.58   4
PPM 229094     14:40:30.2 -17:58:26  8.5  0.56   7
PPM 229080     14:39:55.7 -17:14:27  9.9  0.20   7
42355          14:39:44.9 -17:26:18 14.7         7
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 42355, (2020/01/18 22:33UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 18.83  23
27Bet Lib      15:17:00.3 -09:22:59  2.6 12.27   5
5 Lib          14:45:57.7 -15:27:34  6.5  2.58   4
PPM 229094     14:39:23.0 -17:53:18  8.5  0.56   7
PPM 229080     14:38:48.7 -17:09:19  9.9  0.20   7
42355          14:38:37.8 -17:21:10 14.7         7
Positions are for J2000

Event circumstances last updated at 2019/06/07 23:10:55 UT

Marc W. Buie, Southwest Research Institute

RECON