RECON: TNO occultation with 54598

Event between (54598) Bienor and star GA1320:03378458 with event index number of 1210493

Geocentric closest approach at 2023/02/14 01:43:05 UTC

J2000 position of star is 05:54:29.1 +43:13:29
Equinox of date position of star is 05:56:09.0 +43:13:39
Stellar brightness G=16.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 147 degrees from the moon. Moon is 46% illuminated.
Apparent brightness V=19.0

Object is 13.7 AU from the Sun and 13.2 AU from the Earth.
Apparent velocity is 12.9 km/sec on the sky relative to the star, or, 4.9 arcsec/hr.
The 1-sigma error in the time of the event is 41 seconds.
The 1-sigma cross-track error in the shadow position is 542 km.

The object has an absolute magnitude Hv=7.4
Diameter=195.0 km assuming a 5% albedo -- 15.1 sec chord
Diameter=79.6 km assuming a 30% albedo -- 6.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 54598, (2023/02/14 01:43UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:43.7 +27:58:07  1.1 26.96 127
34Bet Aur      06:01:13.5 +44:56:50  1.9  1.95 145
PPM 048445     05:48:54.1 +42:31:59  6.3  1.50 148
PPM 048556     05:57:11.7 +43:35:38  8.4  0.41 146
PPM 048567     05:57:50.9 +43:06:06 10.3  0.33 146
54598          05:56:09.2 +43:13:39 16.9       146
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 54598, (2023/02/14 01:43UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:17.9 +28:01:33  1.1 26.96 127
34Bet Aur      05:59:31.6 +44:56:51  1.9  1.95 145
PPM 048445     05:47:14.7 +42:31:34  6.3  1.50 148
PPM 048556     05:55:31.2 +43:35:31  8.4  0.41 146
PPM 048567     05:56:10.9 +43:06:00 10.3  0.33 146
54598          05:54:29.1 +43:13:29 16.9       147
Positions are for J2000

Event circumstances last updated at 2023/01/23 03:11:23 UT

Marc W. Buie, Southwest Research Institute

RECON