RECON: TNO occultation with 15BU518

Event between 15BU518 and star UC4-406-059260 with event index number of 193590

Geocentric closest approach at 2018/05/23 01:11:19 UTC

J2000 position of star is 14:21:48.6 -08:56:23
Equinox of date position of star is 14:22:44.4 -09:01:07
Stellar brightness R=14.7, use SENSEUP=128
Star is 53 degrees from the moon. Moon is 60% illuminated.
TNO apparent brightness V=22.4

TNO is 32.3 AU from the Sun and 31.4 AU from the Earth.
The TNO is moving 21.0 km/sec on the sky relative to the star, or, 3.3 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 3320 km.

The TNO has an absolute magnitude Hv=7.3
Diameter=207.0 km assuming a 5% albedo -- 9.9 sec chord
Diameter=84.5 km assuming a 30% albedo -- 4.0 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 15BU518, (2018/05/23 01:11UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:09.9 -11:15:24  1.0 14.11  41
27Bet Lib      15:17:59.9 -09:26:59  2.6 13.63  66
98Kap Vir      14:13:52.8 -10:21:31  4.2  2.57  51
PPM 197434     14:21:00.2 -08:10:11  8.5  0.96  52
PPM 197472     14:23:01.2 -08:48:38  9.9  0.22  53
15BU518        14:22:47.4 -09:01:23 14.7        53
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 15BU518, (2018/05/23 01:11UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 14.11  41
27Bet Lib      15:17:00.3 -09:22:59  2.6 13.63  66
98Kap Vir      14:12:53.8 -10:16:23  4.2  2.57  51
PPM 197434     14:20:01.6 -08:05:10  8.5  0.96  52
PPM 197472     14:22:02.5 -08:43:38  9.9  0.22  53
15BU518        14:21:48.6 -08:56:23 14.7        53
Positions are for J2000

Event circumstances last updated at 2017/06/14 17:01:04 UT

Marc W. Buie, Southwest Research Institute

RECON