RECON: TNO occultation with 12HW87

Event between 12HW87 and star GA0760:07470683 with event index number of 1563295

Geocentric closest approach at 2020/05/27 14:04:36 UTC

J2000 position of star is 17:27:48.8 -13:02:12
Equinox of date position of star is 17:28:57.1 -13:03:08
Stellar brightness G=14.6, use SENSEUP=128
Star is 136 degrees from the moon. Moon is 23% illuminated.
TNO apparent brightness V=25.3

TNO is 33.5 AU from the Sun and 32.6 AU from the Earth.
The TNO is moving 21.8 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 178 seconds.
The 1-sigma cross-track error in the shadow position is 1760 km.

The TNO has an absolute magnitude Hv=10.0
Diameter=187.9 km assuming a 5% albedo -- 2.8 sec chord
Diameter=76.7 km assuming a 30% albedo -- 1.1 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 12HW87, (2020/05/27 14:05UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:39.7 -26:28:32  0.9 19.16 126
35Eta Oph      17:11:33.0 -15:44:56  2.6  5.00 133
53Nu Ser       17:21:58.6 -12:51:58  4.0  1.71 134
PPM 233084     17:28:10.9 -12:31:44  6.6  0.56 136
PPM 233090     17:28:21.5 -12:55:55  9.4  0.19 136
12HW87         17:28:57.8 -13:03:08 14.6       136
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 12HW87, (2020/05/27 14:05UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 19.16 126
35Eta Oph      17:10:22.7 -15:43:29  2.6  5.00 133
53Nu Ser       17:20:49.7 -12:50:49  4.0  1.71 134
PPM 233084     17:27:02.2 -12:30:46  6.6  0.56 136
PPM 233090     17:27:12.6 -12:54:58  9.4  0.19 136
12HW87         17:27:48.8 -13:02:12 14.6       136
Positions are for J2000

Event circumstances last updated at 2020/03/10 21:30:58 UT

Marc W. Buie, Southwest Research Institute

RECON