RECON: TNO occultation with 455171

Event between (455171) 99OM4 and star UC4-404-132618 with event index number of 131484

Geocentric closest approach at 2018/07/28 01:22:21 UTC

J2000 position of star is 22:48:19.3 -09:14:07
Equinox of date position of star is 22:49:15.6 -09:08:25
Stellar brightness R=13.6, use SENSEUP=64
Star is 33 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=23.7

TNO is 45.6 AU from the Sun and 44.8 AU from the Earth.
The TNO is moving 19.7 km/sec on the sky relative to the star, or, 2.2 arcsec/hr.
The 1-sigma error in the time of the event is 461 seconds.
The 1-sigma cross-track error in the shadow position is 4416 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 11.7 sec chord
Diameter=93.5 km assuming a 30% albedo -- 4.8 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 455171, (2018/07/28 01:22UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:40.4 -29:31:24  1.2 20.50  33
70 Aqr         22:49:28.8 -10:27:25  6.2  1.32  32
PPM 206751     22:47:17.6 -09:36:03  8.5  0.68  32
PPM 206797     22:49:25.0 -08:57:42  9.7  0.18  33
455171         22:49:17.6 -09:08:13 13.6        33
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 455171, (2018/07/28 01:22UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.5 -29:37:23  1.2 20.50  33
70 Aqr         22:48:30.3 -10:33:20  6.2  1.32  32
PPM 206751     22:46:19.2 -09:41:57  8.5  0.68  32
PPM 206797     22:48:26.7 -09:03:37  9.7  0.18  33
455171         22:48:19.3 -09:14:07 13.6        33
Positions are for J2000

Event circumstances last updated at 2017/12/05 18:50:03 UT

Marc W. Buie, Southwest Research Institute

RECON