RECON: TNO occultation with 500885

Event between (500885) 13JL65 and star GA0740:06781314 with event index number of 250122

Geocentric closest approach at 2020/02/26 19:04:26 UTC

J2000 position of star is 17:04:55.5 -15:59:26
Equinox of date position of star is 17:06:00.4 -16:00:55
Stellar brightness G=14.6, use SENSEUP=128
Star is 116 degrees from the moon. Moon is 9% illuminated.
TNO apparent brightness V=24.8

TNO is 36.3 AU from the Sun and 36.4 AU from the Earth.
The TNO is moving 10.8 km/sec on the sky relative to the star, or, 1.5 arcsec/hr.
The 1-sigma error in the time of the event is 872 seconds.
The 1-sigma cross-track error in the shadow position is 5347 km.

The TNO has an absolute magnitude Hv=9.0
Diameter=95.5 km assuming a 5% albedo -- 8.9 sec chord
Diameter=39.0 km assuming a 30% albedo -- 3.6 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 500885, (2020/02/26 19:04UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:38.8 -26:28:30  0.9 13.31 122
35Eta Oph      17:11:32.1 -15:44:55  2.6  1.34 114
PPM 232651     17:09:25.2 -17:38:03  6.0  1.80 115
PPM 232639     17:08:55.4 -16:07:05  6.9  0.69 115
PPM 232578     17:06:00.3 -15:57:35  9.3  0.06 116
500885         17:06:05.0 -16:01:01 14.6       115
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 500885, (2020/02/26 19:04UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 13.31 122
35Eta Oph      17:10:22.7 -15:43:29  2.6  1.34 114
PPM 232651     17:08:14.9 -17:36:33  6.0  1.80 115
PPM 232639     17:07:45.8 -16:05:35  6.9  0.69 115
PPM 232578     17:04:50.8 -15:56:00  9.3  0.06 116
500885         17:04:55.5 -15:59:26 14.6       116
Positions are for J2000

Event circumstances last updated at 2018/10/26 20:46:45 UT

Marc W. Buie, Southwest Research Institute

RECON