RECON: TNO occultation with 54598

Event between (54598) Bienor and star GA1320:02794456 with event index number of 1105081

Geocentric closest approach at 2022/03/25 15:08:11 UTC

J2000 position of star is 05:14:59.6 +42:39:38
Equinox of date position of star is 05:16:34.6 +42:41:03
Stellar brightness G=15.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 156 degrees from the moon. Moon is 46% illuminated.
TNO apparent brightness V=19.3

TNO is 13.9 AU from the Sun and 14.1 AU from the Earth.
The TNO is moving 18.2 km/sec on the sky relative to the star, or, 6.4 arcsec/hr.
The 1-sigma error in the time of the event is 32 seconds.
The 1-sigma cross-track error in the shadow position is 528 km.

The TNO has an absolute magnitude Hv=7.5
Diameter=187.1 km assuming a 5% albedo -- 10.3 sec chord
Diameter=76.4 km assuming a 30% albedo -- 4.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 54598, (2022/03/25 15:08UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:11.9 +16:33:08  0.8 27.45 148
34Bet Aur      06:01:09.6 +44:56:50  1.9  8.35 160
20Rho Aur      05:23:23.0 +41:49:28  4.9  1.52 157
PPM 047916     05:17:48.0 +42:46:45  8.0  0.24 156
PPM 047904     05:17:07.1 +42:33:07  8.9  0.17 156
PPM 047896     05:16:54.3 +42:43:26 10.4  0.07 156
54598          05:16:34.8 +42:41:03 15.6       156
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, (2022/03/25 15:08UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 27.45 148
34Bet Aur      05:59:31.6 +44:56:51  1.9  8.35 160
20Rho Aur      05:21:48.4 +41:48:15  4.9  1.52 157
PPM 047916     05:16:12.6 +42:45:22  8.0  0.24 156
PPM 047904     05:15:32.0 +42:31:42  8.9  0.17 156
PPM 047896     05:15:19.1 +42:42:01 10.4  0.07 156
54598          05:14:59.6 +42:39:38 15.6       156
Positions are for J2000

Event circumstances last updated at 2022/03/12 01:35:20 UT

Marc W. Buie, Southwest Research Institute

RECON