RECON: TNO occultation with 495190

Event between (495190) 12VS113 and star UC4-423-003769 with event index number of 200767

Geocentric closest approach at 2018/12/26 23:51:21 UTC

J2000 position of star is 03:02:29.3 -05:30:40
Equinox of date position of star is 03:03:21.5 -05:26:35
Stellar brightness R=15.5, use SENSEUP=128
Star is 112 degrees from the moon. Moon is 76% illuminated.
TNO apparent brightness V=23.1

TNO is 38.3 AU from the Sun and 37.8 AU from the Earth.
The TNO is moving 14.7 km/sec on the sky relative to the star, or, 1.9 arcsec/hr.
The 1-sigma error in the time of the event is 322 seconds.
The 1-sigma cross-track error in the shadow position is 2547 km.

The TNO has an absolute magnitude Hv=7.2
Diameter=218.8 km assuming a 5% albedo -- 14.8 sec chord
Diameter=89.3 km assuming a 30% albedo -- 6.1 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 495190, (2018/12/26 23:51UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:00.7 +16:32:46  0.8 31.91  84
Menkar         03:03:16.5 +04:09:47  2.5  9.60 110
PPM 185399     03:07:29.9 -06:00:59  4.9  1.17 111
PPM 185312     03:03:05.7 -06:25:17  6.7  0.99 112
PPM 185320     03:03:33.4 -05:22:27  9.5  0.07 112
495190         03:03:26.0 -05:26:15 15.5       112
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 495190, (2018/12/26 23:51UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 31.91  84
Menkar         03:02:16.8 +04:05:22  2.5  9.60 110
PPM 185399     03:06:33.5 -06:05:19  4.9  1.17 111
PPM 185312     03:02:09.4 -06:29:43  6.7  0.99 112
PPM 185320     03:02:36.7 -05:26:53  9.5  0.07 112
495190         03:02:29.3 -05:30:40 15.5       112
Positions are for J2000

Event circumstances last updated at 2017/07/01 17:40:31 UT

Marc W. Buie, Southwest Research Institute

RECON