RECON: TNO occultation with 54598

Event between (54598) Bienor and star UC4-643-011336 with event index number of 95721

Geocentric closest approach at 2017/12/29 16:28:00 UTC

J2000 position of star is 02:49:15.5 +38:29:52
Equinox of date position of star is 02:50:23.6 +38:34:18
Stellar brightness R=12.9, use SENSEUP=32
Star is 26 degrees from the moon. Moon is 83% illuminated.
TNO apparent brightness V=19.5

TNO is 15.1 AU from the Sun and 14.4 AU from the Earth.
The TNO is moving 14.9 km/sec on the sky relative to the star, or, 5.2 arcsec/hr.
The 1-sigma error in the time of the event is 54 seconds.
The 1-sigma cross-track error in the shadow position is 877 km.

The TNO has an absolute magnitude Hv=7.5
Diameter=190.6 km assuming a 5% albedo -- 12.7 sec chord
Diameter=77.8 km assuming a 30% albedo -- 5.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 54598, (2017/12/29 16:28UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:36:57.3 +16:32:39  0.8 32.07  20
Algol          03:09:20.8 +41:01:25  2.1  4.39  28
16 Per         02:51:43.6 +38:23:30  4.5  0.32  26
PPM 067701     02:46:27.4 +38:08:37  8.2  0.88  26
16 Per         02:51:43.6 +38:23:30  4.5  0.32  26
PPM 067764     02:49:18.7 +38:47:57 10.8  0.31  27
54598          02:50:23.8 +38:34:18 12.9        26
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, (2017/12/29 16:28UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 32.07  20
Algol          03:08:10.1 +40:57:20  2.1  4.39  28
16 Per         02:50:35.3 +38:19:05  4.5  0.32  26
PPM 067701     02:45:19.6 +38:04:07  8.2  0.88  26
16 Per         02:50:35.3 +38:19:05  4.5  0.32  26
PPM 067764     02:48:10.4 +38:43:29 10.8  0.31  27
54598          02:49:15.5 +38:29:52 12.9        26
Positions are for J2000

Event circumstances last updated at 2017/12/14 18:17:48 UT

Marc W. Buie, Southwest Research Institute

RECON