RECON: TNO occultation with 495190

Event between (495190) 12VS113 and star GA0840:00291384 with event index number of 2218377

Geocentric closest approach at 2022/08/08 20:26:42 UTC

J2000 position of star is 03:37:20.6 -04:19:17
Equinox of date position of star is 03:38:25.8 -04:15:03
Stellar brightness G=15.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 133 degrees from the moon. Moon is 85% illuminated.
TNO apparent brightness V=23.2

TNO is 38.6 AU from the Sun and 38.7 AU from the Earth.
The TNO is moving 14.8 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 228 seconds.
The 1-sigma cross-track error in the shadow position is 2972 km.

The TNO has an absolute magnitude Hv=7.2
Diameter=229.1 km assuming a 5% albedo -- 15.1 sec chord
Diameter=93.5 km assuming a 30% albedo -- 6.2 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 495190, (2022/08/08 20:29UT)
Object            RA         Dec     mag  sep  mel
Rigel          05:15:37.5 -08:10:38  0.1 24.46 143
Menkar         03:03:27.8 +04:10:38  2.5 12.14 131
PPM 186038     03:40:46.4 -03:19:17  6.4  1.09 134
PPM 185948     03:36:13.9 -04:49:28  8.5  0.80 132
PPM 186005     03:39:12.4 -04:15:32  9.1  0.18 133
495190         03:38:28.3 -04:14:54 15.4       133
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, (2022/08/08 20:29UT)
Object            RA         Dec     mag  sep  mel
Rigel          05:14:32.3 -08:12:06  0.1 24.46 143
Menkar         03:02:16.8 +04:05:21  2.5 12.14 131
PPM 186038     03:39:38.3 -03:23:36  6.4  1.09 134
PPM 185948     03:35:06.5 -04:53:55  8.5  0.80 132
PPM 186005     03:38:04.7 -04:19:54  9.1  0.18 133
495190         03:37:20.6 -04:19:17 15.4       133
Positions are for J2000

Event circumstances last updated at 2021/10/14 01:42:28 UT

Marc W. Buie, Southwest Research Institute

RECON