RECON: TNO occultation with 42301

Event between (42301) 01UR163 and star UC4-526-004189 with event index number of 204459

Geocentric closest approach at 2019/07/12 03:27:21 UTC

J2000 position of star is 02:23:32.8 +15:02:44
Equinox of date position of star is 02:24:31.7 +15:07:35
Stellar brightness R=15.0, use SENSEUP=128
Star is 164 degrees from the moon. Moon is 78% illuminated.
TNO apparent brightness V=21.5

TNO is 53.2 AU from the Sun and 53.5 AU from the Earth.
The TNO is moving 13.4 km/sec on the sky relative to the star, or, 1.2 arcsec/hr.
The 1-sigma error in the time of the event is 180 seconds.
The 1-sigma cross-track error in the shadow position is 2085 km.

The TNO has an absolute magnitude Hv=4.1
Diameter=912.0 km assuming a 5% albedo -- 67.9 sec chord
Diameter=372.3 km assuming a 30% albedo -- 27.7 sec chord
Dynamical classification is 9:4EEEEE
 
 
 
 
 
 
 
 

Star training set for 42301, (2019/07/12 03:27UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:02.6 +16:32:49  0.8 31.85 164
6Bet Ari       01:55:43.4 +20:54:10  2.6  8.97 157
29 Ari         02:33:58.5 +15:07:12  6.0  2.26 166
PPM 118192     02:25:31.5 +15:36:44  7.9  0.53 164
PPM 118201     02:25:54.4 +14:45:24  9.7  0.49 164
PPM 118178     02:24:28.8 +14:56:08 10.2  0.20 164
42301          02:24:37.0 +15:08:01 15.0       164
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 42301, (2019/07/12 03:27UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 31.85 164
6Bet Ari       01:54:38.5 +20:48:27  2.6  8.97 157
29 Ari         02:32:54.1 +15:02:05  6.0  2.26 166
PPM 118192     02:24:27.2 +15:31:29  7.9  0.53 164
PPM 118201     02:24:50.3 +14:40:08  9.7  0.49 164
PPM 118178     02:23:24.7 +14:50:52 10.2  0.20 164
42301          02:23:32.8 +15:02:44 15.0       164
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:07:24 UT

Marc W. Buie, Southwest Research Institute

RECON